drivers/gpu/drm/panel/panel-sony-tulip-truly-nt35521.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2021, Linaro Limited
  *
  * Generated with linux-mdss-dsi-panel-driver-generator from vendor device tree:
  *   Copyright (c) 2013, The Linux Foundation. All rights reserved.
  */

 #include <linux/backlight.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/regulator/consumer.h>

 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_modes.h>
 #include <drm/drm_panel.h>

 struct truly_nt35521 {
 	struct drm_panel panel;
 	struct mipi_dsi_device *dsi;
 	struct regulator_bulk_data supplies[2];
 	struct gpio_desc *reset_gpio;
 	struct gpio_desc *blen_gpio;
 };

 #define NT35521_DCS_SWITCH_PAGE	0xf0

 #define nt35521_switch_page(dsi_ctx, page) \
 	mipi_dsi_dcs_write_seq_multi(dsi_ctx, NT35521_DCS_SWITCH_PAGE, \
 				     0x55, 0xaa, 0x52, 0x08, (page))

 static inline
 struct truly_nt35521 *to_truly_nt35521(struct drm_panel *panel)
 {
 	return container_of(panel, struct truly_nt35521, panel);
 }

 static void truly_nt35521_reset(struct truly_nt35521 *ctx)
 {
 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 	usleep_range(1000, 2000);
 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 	usleep_range(10000, 11000);
 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
 	msleep(150);
 }

 static int truly_nt35521_on(struct truly_nt35521 *ctx)
 {
 	struct mipi_dsi_device *dsi = ctx->dsi;
 	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

 	dsi->mode_flags |= MIPI_DSI_MODE_LPM;

 	nt35521_switch_page(&dsi_ctx, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xff, 0xaa, 0x55, 0xa5, 0x80);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x11, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf7, 0x20, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x01);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1, 0x21);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbd, 0x01, 0xa0, 0x10, 0x08, 0x01);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb8, 0x01, 0x02, 0x0c, 0x02);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbb, 0x11, 0x11);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbc, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb6, 0x02);

 	nt35521_switch_page(&dsi_ctx, 0x01);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x09, 0x09);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1, 0x09, 0x09);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbc, 0x8c, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbd, 0x8c, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xca, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc0, 0x04);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbe, 0xb5);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb3, 0x35, 0x35);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb4, 0x25, 0x25);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9, 0x43, 0x43);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xba, 0x24, 0x24);

 	nt35521_switch_page(&dsi_ctx, 0x02);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xee, 0x03);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0,
 					 0x00, 0xb2, 0x00, 0xb3, 0x00, 0xb6, 0x00, 0xc3,
 					 0x00, 0xce, 0x00, 0xe1, 0x00, 0xf3, 0x01, 0x11);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1,
 					 0x01, 0x2e, 0x01, 0x5c, 0x01, 0x82, 0x01, 0xc3,
 					 0x01, 0xfe, 0x02, 0x00, 0x02, 0x37, 0x02, 0x77);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb2,
 					 0x02, 0xa1, 0x02, 0xd7, 0x02, 0xfe, 0x03, 0x2c,
 					 0x03, 0x4b, 0x03, 0x63, 0x03, 0x8f, 0x03, 0x90);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb3, 0x03, 0x96, 0x03, 0x98);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb4,
 					 0x00, 0x81, 0x00, 0x8b, 0x00, 0x9c, 0x00, 0xa9,
 					 0x00, 0xb5, 0x00, 0xcb, 0x00, 0xdf, 0x01, 0x02);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb5,
 					 0x01, 0x1f, 0x01, 0x51, 0x01, 0x7a, 0x01, 0xbf,
 					 0x01, 0xfa, 0x01, 0xfc, 0x02, 0x34, 0x02, 0x76);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb6,
 					 0x02, 0x9f, 0x02, 0xd7, 0x02, 0xfc, 0x03, 0x2c,
 					 0x03, 0x4a, 0x03, 0x63, 0x03, 0x8f, 0x03, 0xa2);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb7, 0x03, 0xb8, 0x03, 0xba);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb8,
 					 0x00, 0x01, 0x00, 0x02, 0x00, 0x0e, 0x00, 0x2a,
 					 0x00, 0x41, 0x00, 0x67, 0x00, 0x87, 0x00, 0xb9);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9,
 					 0x00, 0xe2, 0x01, 0x22, 0x01, 0x54, 0x01, 0xa3,
 					 0x01, 0xe6, 0x01, 0xe7, 0x02, 0x24, 0x02, 0x67);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xba,
 					 0x02, 0x93, 0x02, 0xcd, 0x02, 0xf6, 0x03, 0x31,
 					 0x03, 0x6c, 0x03, 0xe9, 0x03, 0xef, 0x03, 0xf4);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbb, 0x03, 0xf6, 0x03, 0xf7);

 	nt35521_switch_page(&dsi_ctx, 0x03);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x22, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1, 0x22, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb2, 0x05, 0x00, 0x60, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb3, 0x05, 0x00, 0x60, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb4, 0x05, 0x00, 0x60, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb5, 0x05, 0x00, 0x60, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xba, 0x53, 0x00, 0x60, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbb, 0x53, 0x00, 0x60, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbc, 0x53, 0x00, 0x60, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbd, 0x53, 0x00, 0x60, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc0, 0x00, 0x34, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc1, 0x00, 0x00, 0x34, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc2, 0x00, 0x00, 0x34, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc3, 0x00, 0x00, 0x34, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc4, 0x60);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc5, 0xc0);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc6, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc7, 0x00);

 	nt35521_switch_page(&dsi_ctx, 0x05);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x17, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1, 0x17, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb2, 0x17, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb3, 0x17, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb4, 0x17, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb5, 0x17, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb6, 0x17, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb7, 0x17, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb8, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9, 0x00, 0x03);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xba, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbb, 0x02, 0x03);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbc, 0x02, 0x03);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbd, 0x03, 0x03, 0x00, 0x03, 0x03);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc0, 0x0b);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc1, 0x09);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc2, 0xa6);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc3, 0x05);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc4, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc5, 0x02);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc6, 0x22);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc7, 0x03);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc8, 0x07, 0x20);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc9, 0x03, 0x20);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xca, 0x01, 0x60);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcb, 0x01, 0x60);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcc, 0x00, 0x00, 0x02);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcd, 0x00, 0x00, 0x02);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xce, 0x00, 0x00, 0x02);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcf, 0x00, 0x00, 0x02);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd1, 0x00, 0x05, 0x01, 0x07, 0x10);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd2, 0x10, 0x05, 0x05, 0x03, 0x10);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd3, 0x20, 0x00, 0x43, 0x07, 0x10);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd4, 0x30, 0x00, 0x43, 0x07, 0x10);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd0,
 					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd5,
 					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 					 0x00, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd6,
 					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 					 0x00, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd7,
 					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 					 0x00, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe5, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe6, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe7, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe8, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe9, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xea, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xeb, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xec, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xed, 0x30);

 	nt35521_switch_page(&dsi_ctx, 0x06);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb2, 0x2d, 0x2e);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb3, 0x31, 0x34);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb4, 0x29, 0x2a);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb5, 0x12, 0x10);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb6, 0x18, 0x16);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb7, 0x00, 0x02);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb8, 0x08, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xba, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbb, 0x31, 0x08);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbc, 0x03, 0x01);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbd, 0x17, 0x19);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbe, 0x11, 0x13);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbf, 0x2a, 0x29);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc0, 0x34, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc1, 0x2e, 0x2d);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc2, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc3, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc4, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc5, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc6, 0x2e, 0x2d);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc7, 0x31, 0x34);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc8, 0x29, 0x2a);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc9, 0x17, 0x19);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xca, 0x11, 0x13);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcb, 0x03, 0x01);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcc, 0x08, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcd, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xce, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcf, 0x31, 0x08);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd0, 0x00, 0x02);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd1, 0x12, 0x10);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd2, 0x18, 0x16);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd3, 0x2a, 0x29);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd4, 0x34, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd5, 0x2d, 0x2e);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd6, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd7, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe5, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe6, 0x31, 0x31);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd9, 0x00, 0x00, 0x00, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe7, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x02);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf7, 0x47);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x0a);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf7, 0x02);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x17);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf4, 0x60);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x01);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf9, 0x46);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x11);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf3, 0x01);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x35, 0x00);

 	nt35521_switch_page(&dsi_ctx, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd9, 0x02, 0x03, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf0, 0x55, 0xaa, 0x52, 0x00, 0x00);

 	nt35521_switch_page(&dsi_ctx, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1, 0x6c, 0x21);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf0, 0x55, 0xaa, 0x52, 0x00, 0x00);
 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x35, 0x00);

 	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
 	mipi_dsi_msleep(&dsi_ctx, 120);
 	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);

 	usleep_range(1000, 2000);

 	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x53, 0x24);

 	return dsi_ctx.accum_err;
 }

 static int truly_nt35521_off(struct truly_nt35521 *ctx)
 {
 	struct mipi_dsi_device *dsi = ctx->dsi;
 	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

 	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

 	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
 	mipi_dsi_msleep(&dsi_ctx, 50);
 	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
 	mipi_dsi_msleep(&dsi_ctx, 150);

 	return dsi_ctx.accum_err;
 }

 static int truly_nt35521_prepare(struct drm_panel *panel)
 {
 	struct truly_nt35521 *ctx = to_truly_nt35521(panel);
 	struct device *dev = &ctx->dsi->dev;
 	int ret;

 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 	if (ret < 0) {
 		dev_err(dev, "Failed to enable regulators: %d\n", ret);
 		return ret;
 	}

 	truly_nt35521_reset(ctx);

 	ret = truly_nt35521_on(ctx);
 	if (ret < 0) {
 		dev_err(dev, "Failed to initialize panel: %d\n", ret);
 		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 		return ret;
 	}

 	return 0;
 }

 static int truly_nt35521_unprepare(struct drm_panel *panel)
 {
 	struct truly_nt35521 *ctx = to_truly_nt35521(panel);
 	struct device *dev = &ctx->dsi->dev;
 	int ret;

 	ret = truly_nt35521_off(ctx);
 	if (ret < 0)
 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);

 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
 			       ctx->supplies);

 	return 0;
 }

 static int truly_nt35521_enable(struct drm_panel *panel)
 {
 	struct truly_nt35521 *ctx = to_truly_nt35521(panel);

 	gpiod_set_value_cansleep(ctx->blen_gpio, 1);

 	return 0;
 }

 static int truly_nt35521_disable(struct drm_panel *panel)
 {
 	struct truly_nt35521 *ctx = to_truly_nt35521(panel);

 	gpiod_set_value_cansleep(ctx->blen_gpio, 0);

 	return 0;
 }

 static const struct drm_display_mode truly_nt35521_mode = {
 	.clock = (720 + 232 + 20 + 112) * (1280 + 18 + 1 + 18) * 60 / 1000,
 	.hdisplay = 720,
 	.hsync_start = 720 + 232,
 	.hsync_end = 720 + 232 + 20,
 	.htotal = 720 + 232 + 20 + 112,
 	.vdisplay = 1280,
 	.vsync_start = 1280 + 18,
 	.vsync_end = 1280 + 18 + 1,
 	.vtotal = 1280 + 18 + 1 + 18,
 	.width_mm = 65,
 	.height_mm = 116,
 };

 static int truly_nt35521_get_modes(struct drm_panel *panel,
 				   struct drm_connector *connector)
 {
 	struct drm_display_mode *mode;

 	mode = drm_mode_duplicate(connector->dev, &truly_nt35521_mode);
 	if (!mode)
 		return -ENOMEM;

 	drm_mode_set_name(mode);

 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 	connector->display_info.width_mm = mode->width_mm;
 	connector->display_info.height_mm = mode->height_mm;
 	drm_mode_probed_add(connector, mode);

 	return 1;
 }

 static const struct drm_panel_funcs truly_nt35521_panel_funcs = {
 	.prepare = truly_nt35521_prepare,
 	.unprepare = truly_nt35521_unprepare,
 	.enable = truly_nt35521_enable,
 	.disable = truly_nt35521_disable,
 	.get_modes = truly_nt35521_get_modes,
 };

 static int truly_nt35521_bl_update_status(struct backlight_device *bl)
 {
 	struct mipi_dsi_device *dsi = bl_get_data(bl);
 	u16 brightness = backlight_get_brightness(bl);
 	int ret;

 	ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static int truly_nt35521_bl_get_brightness(struct backlight_device *bl)
 {
 	struct mipi_dsi_device *dsi = bl_get_data(bl);
 	u16 brightness;
 	int ret;

 	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
 	if (ret < 0)
 		return ret;

 	return brightness & 0xff;
 }

 static const struct backlight_ops truly_nt35521_bl_ops = {
 	.update_status = truly_nt35521_bl_update_status,
 	.get_brightness = truly_nt35521_bl_get_brightness,
 };

 static struct backlight_device *
 truly_nt35521_create_backlight(struct mipi_dsi_device *dsi)
 {
 	struct device *dev = &dsi->dev;
 	const struct backlight_properties props = {
 		.type = BACKLIGHT_RAW,
 		.brightness = 255,
 		.max_brightness = 255,
 	};

 	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
 					      &truly_nt35521_bl_ops, &props);
 }

 static int truly_nt35521_probe(struct mipi_dsi_device *dsi)
 {
 	struct device *dev = &dsi->dev;
 	struct truly_nt35521 *ctx;
 	int ret;

 	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
 		return -ENOMEM;

 	ctx->supplies[0].supply = "positive5";
 	ctx->supplies[1].supply = "negative5";
 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
 				      ctx->supplies);
 	if (ret < 0) {
 		dev_err(dev, "Failed to get regulators: %d\n", ret);
 		return ret;
 	}

 	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 	if (IS_ERR(ctx->reset_gpio))
 		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
 				     "Failed to get reset-gpios\n");

 	ctx->blen_gpio = devm_gpiod_get(dev, "backlight", GPIOD_OUT_LOW);
 	if (IS_ERR(ctx->blen_gpio))
 		return dev_err_probe(dev, PTR_ERR(ctx->blen_gpio),
 				     "Failed to get backlight-gpios\n");

 	ctx->dsi = dsi;
 	mipi_dsi_set_drvdata(dsi, ctx);

 	dsi->lanes = 4;
 	dsi->format = MIPI_DSI_FMT_RGB888;
 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
 			  MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_NO_EOT_PACKET |
 			  MIPI_DSI_CLOCK_NON_CONTINUOUS;

 	drm_panel_init(&ctx->panel, dev, &truly_nt35521_panel_funcs,
 		       DRM_MODE_CONNECTOR_DSI);

 	ctx->panel.backlight = truly_nt35521_create_backlight(dsi);
 	if (IS_ERR(ctx->panel.backlight))
 		return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
 				     "Failed to create backlight\n");

 	drm_panel_add(&ctx->panel);

 	ret = mipi_dsi_attach(dsi);
 	if (ret < 0) {
 		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
 		drm_panel_remove(&ctx->panel);
 		return ret;
 	}

 	return 0;
 }

 static void truly_nt35521_remove(struct mipi_dsi_device *dsi)
 {
 	struct truly_nt35521 *ctx = mipi_dsi_get_drvdata(dsi);
 	int ret;

 	ret = mipi_dsi_detach(dsi);
 	if (ret < 0)
 		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);

 	drm_panel_remove(&ctx->panel);
 }

 static const struct of_device_id truly_nt35521_of_match[] = {
 	{ .compatible = "sony,tulip-truly-nt35521" },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, truly_nt35521_of_match);

 static struct mipi_dsi_driver truly_nt35521_driver = {
 	.probe = truly_nt35521_probe,
 	.remove = truly_nt35521_remove,
 	.driver = {
 		.name = "panel-truly-nt35521",
 		.of_match_table = truly_nt35521_of_match,
 	},
 };
 module_mipi_dsi_driver(truly_nt35521_driver);

 MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
 MODULE_DESCRIPTION("DRM driver for Sony Tulip Truly NT35521 panel");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Copyright (c) 2021, Linaro Limited
	*
	* Generated with linux-mdss-dsi-panel-driver-generator from vendor device tree:
	* Copyright (c) 2013, The Linux Foundation. All rights reserved.
	*/

	#include <linux/backlight.h>
	#include <linux/delay.h>
	#include <linux/gpio/consumer.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/regulator/consumer.h>

	#include <drm/drm_mipi_dsi.h>
	#include <drm/drm_modes.h>
	#include <drm/drm_panel.h>

	struct truly_nt35521 {
	struct drm_panel panel;
	struct mipi_dsi_device *dsi;
	struct regulator_bulk_data supplies[2];
	struct gpio_desc *reset_gpio;
	struct gpio_desc *blen_gpio;
	};

	#define NT35521_DCS_SWITCH_PAGE 0xf0

	#define nt35521_switch_page(dsi_ctx, page) \
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, NT35521_DCS_SWITCH_PAGE, \
	0x55, 0xaa, 0x52, 0x08, (page))

	static inline
	struct truly_nt35521 to_truly_nt35521(struct drm_panel panel)
	{
	return container_of(panel, struct truly_nt35521, panel);
	}

	static void truly_nt35521_reset(struct truly_nt35521 *ctx)
	{
	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
	usleep_range(1000, 2000);
	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
	usleep_range(10000, 11000);
	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
	msleep(150);
	}

	static int truly_nt35521_on(struct truly_nt35521 *ctx)
	{
	struct mipi_dsi_device *dsi = ctx->dsi;
	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

	dsi->mode_flags \|= MIPI_DSI_MODE_LPM;

	nt35521_switch_page(&dsi_ctx, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xff, 0xaa, 0x55, 0xa5, 0x80);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x11, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf7, 0x20, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x01);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1, 0x21);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbd, 0x01, 0xa0, 0x10, 0x08, 0x01);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb8, 0x01, 0x02, 0x0c, 0x02);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbb, 0x11, 0x11);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbc, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb6, 0x02);

	nt35521_switch_page(&dsi_ctx, 0x01);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x09, 0x09);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1, 0x09, 0x09);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbc, 0x8c, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbd, 0x8c, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xca, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc0, 0x04);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbe, 0xb5);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb3, 0x35, 0x35);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb4, 0x25, 0x25);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9, 0x43, 0x43);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xba, 0x24, 0x24);

	nt35521_switch_page(&dsi_ctx, 0x02);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xee, 0x03);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0,
	0x00, 0xb2, 0x00, 0xb3, 0x00, 0xb6, 0x00, 0xc3,
	0x00, 0xce, 0x00, 0xe1, 0x00, 0xf3, 0x01, 0x11);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1,
	0x01, 0x2e, 0x01, 0x5c, 0x01, 0x82, 0x01, 0xc3,
	0x01, 0xfe, 0x02, 0x00, 0x02, 0x37, 0x02, 0x77);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb2,
	0x02, 0xa1, 0x02, 0xd7, 0x02, 0xfe, 0x03, 0x2c,
	0x03, 0x4b, 0x03, 0x63, 0x03, 0x8f, 0x03, 0x90);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb3, 0x03, 0x96, 0x03, 0x98);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb4,
	0x00, 0x81, 0x00, 0x8b, 0x00, 0x9c, 0x00, 0xa9,
	0x00, 0xb5, 0x00, 0xcb, 0x00, 0xdf, 0x01, 0x02);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb5,
	0x01, 0x1f, 0x01, 0x51, 0x01, 0x7a, 0x01, 0xbf,
	0x01, 0xfa, 0x01, 0xfc, 0x02, 0x34, 0x02, 0x76);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb6,
	0x02, 0x9f, 0x02, 0xd7, 0x02, 0xfc, 0x03, 0x2c,
	0x03, 0x4a, 0x03, 0x63, 0x03, 0x8f, 0x03, 0xa2);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb7, 0x03, 0xb8, 0x03, 0xba);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb8,
	0x00, 0x01, 0x00, 0x02, 0x00, 0x0e, 0x00, 0x2a,
	0x00, 0x41, 0x00, 0x67, 0x00, 0x87, 0x00, 0xb9);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9,
	0x00, 0xe2, 0x01, 0x22, 0x01, 0x54, 0x01, 0xa3,
	0x01, 0xe6, 0x01, 0xe7, 0x02, 0x24, 0x02, 0x67);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xba,
	0x02, 0x93, 0x02, 0xcd, 0x02, 0xf6, 0x03, 0x31,
	0x03, 0x6c, 0x03, 0xe9, 0x03, 0xef, 0x03, 0xf4);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbb, 0x03, 0xf6, 0x03, 0xf7);

	nt35521_switch_page(&dsi_ctx, 0x03);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x22, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1, 0x22, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb2, 0x05, 0x00, 0x60, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb3, 0x05, 0x00, 0x60, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb4, 0x05, 0x00, 0x60, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb5, 0x05, 0x00, 0x60, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xba, 0x53, 0x00, 0x60, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbb, 0x53, 0x00, 0x60, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbc, 0x53, 0x00, 0x60, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbd, 0x53, 0x00, 0x60, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc0, 0x00, 0x34, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc1, 0x00, 0x00, 0x34, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc2, 0x00, 0x00, 0x34, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc3, 0x00, 0x00, 0x34, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc4, 0x60);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc5, 0xc0);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc6, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc7, 0x00);

	nt35521_switch_page(&dsi_ctx, 0x05);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x17, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1, 0x17, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb2, 0x17, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb3, 0x17, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb4, 0x17, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb5, 0x17, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb6, 0x17, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb7, 0x17, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb8, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9, 0x00, 0x03);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xba, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbb, 0x02, 0x03);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbc, 0x02, 0x03);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbd, 0x03, 0x03, 0x00, 0x03, 0x03);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc0, 0x0b);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc1, 0x09);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc2, 0xa6);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc3, 0x05);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc4, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc5, 0x02);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc6, 0x22);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc7, 0x03);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc8, 0x07, 0x20);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc9, 0x03, 0x20);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xca, 0x01, 0x60);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcb, 0x01, 0x60);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcc, 0x00, 0x00, 0x02);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcd, 0x00, 0x00, 0x02);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xce, 0x00, 0x00, 0x02);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcf, 0x00, 0x00, 0x02);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd1, 0x00, 0x05, 0x01, 0x07, 0x10);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd2, 0x10, 0x05, 0x05, 0x03, 0x10);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd3, 0x20, 0x00, 0x43, 0x07, 0x10);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd4, 0x30, 0x00, 0x43, 0x07, 0x10);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd0,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd5,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd6,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd7,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe5, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe6, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe7, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe8, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe9, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xea, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xeb, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xec, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xed, 0x30);

	nt35521_switch_page(&dsi_ctx, 0x06);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb2, 0x2d, 0x2e);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb3, 0x31, 0x34);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb4, 0x29, 0x2a);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb5, 0x12, 0x10);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb6, 0x18, 0x16);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb7, 0x00, 0x02);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb8, 0x08, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xba, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbb, 0x31, 0x08);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbc, 0x03, 0x01);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbd, 0x17, 0x19);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbe, 0x11, 0x13);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xbf, 0x2a, 0x29);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc0, 0x34, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc1, 0x2e, 0x2d);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc2, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc3, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc4, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc5, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc6, 0x2e, 0x2d);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc7, 0x31, 0x34);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc8, 0x29, 0x2a);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xc9, 0x17, 0x19);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xca, 0x11, 0x13);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcb, 0x03, 0x01);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcc, 0x08, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcd, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xce, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xcf, 0x31, 0x08);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd0, 0x00, 0x02);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd1, 0x12, 0x10);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd2, 0x18, 0x16);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd3, 0x2a, 0x29);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd4, 0x34, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd5, 0x2d, 0x2e);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd6, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd7, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe5, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe6, 0x31, 0x31);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd9, 0x00, 0x00, 0x00, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xe7, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x02);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf7, 0x47);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x0a);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf7, 0x02);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x17);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf4, 0x60);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x01);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf9, 0x46);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x6f, 0x11);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf3, 0x01);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x35, 0x00);

	nt35521_switch_page(&dsi_ctx, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xd9, 0x02, 0x03, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf0, 0x55, 0xaa, 0x52, 0x00, 0x00);

	nt35521_switch_page(&dsi_ctx, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb1, 0x6c, 0x21);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf0, 0x55, 0xaa, 0x52, 0x00, 0x00);
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x35, 0x00);

	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
	mipi_dsi_msleep(&dsi_ctx, 120);
	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);

	usleep_range(1000, 2000);

	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0x53, 0x24);

	return dsi_ctx.accum_err;
	}

	static int truly_nt35521_off(struct truly_nt35521 *ctx)
	{
	struct mipi_dsi_device *dsi = ctx->dsi;
	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
	mipi_dsi_msleep(&dsi_ctx, 50);
	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
	mipi_dsi_msleep(&dsi_ctx, 150);

	return dsi_ctx.accum_err;
	}

	static int truly_nt35521_prepare(struct drm_panel *panel)
	{
	struct truly_nt35521 *ctx = to_truly_nt35521(panel);
	struct device *dev = &ctx->dsi->dev;
	int ret;

	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
	if (ret < 0) {
	dev_err(dev, "Failed to enable regulators: %d\n", ret);
	return ret;
	}

	truly_nt35521_reset(ctx);

	ret = truly_nt35521_on(ctx);
	if (ret < 0) {
	dev_err(dev, "Failed to initialize panel: %d\n", ret);
	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
	return ret;
	}

	return 0;
	}

	static int truly_nt35521_unprepare(struct drm_panel *panel)
	{
	struct truly_nt35521 *ctx = to_truly_nt35521(panel);
	struct device *dev = &ctx->dsi->dev;
	int ret;

	ret = truly_nt35521_off(ctx);
	if (ret < 0)
	dev_err(dev, "Failed to un-initialize panel: %d\n", ret);

	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
	ctx->supplies);

	return 0;
	}

	static int truly_nt35521_enable(struct drm_panel *panel)
	{
	struct truly_nt35521 *ctx = to_truly_nt35521(panel);

	gpiod_set_value_cansleep(ctx->blen_gpio, 1);

	return 0;
	}

	static int truly_nt35521_disable(struct drm_panel *panel)
	{
	struct truly_nt35521 *ctx = to_truly_nt35521(panel);

	gpiod_set_value_cansleep(ctx->blen_gpio, 0);

	return 0;
	}

	static const struct drm_display_mode truly_nt35521_mode = {
	.clock = (720 + 232 + 20 + 112) * (1280 + 18 + 1 + 18) * 60 / 1000,
	.hdisplay = 720,
	.hsync_start = 720 + 232,
	.hsync_end = 720 + 232 + 20,
	.htotal = 720 + 232 + 20 + 112,
	.vdisplay = 1280,
	.vsync_start = 1280 + 18,
	.vsync_end = 1280 + 18 + 1,
	.vtotal = 1280 + 18 + 1 + 18,
	.width_mm = 65,
	.height_mm = 116,
	};

	static int truly_nt35521_get_modes(struct drm_panel *panel,
	struct drm_connector *connector)
	{
	struct drm_display_mode *mode;

	mode = drm_mode_duplicate(connector->dev, &truly_nt35521_mode);
	if (!mode)
	return -ENOMEM;

	drm_mode_set_name(mode);

	mode->type = DRM_MODE_TYPE_DRIVER \| DRM_MODE_TYPE_PREFERRED;
	connector->display_info.width_mm = mode->width_mm;
	connector->display_info.height_mm = mode->height_mm;
	drm_mode_probed_add(connector, mode);

	return 1;
	}

	static const struct drm_panel_funcs truly_nt35521_panel_funcs = {
	.prepare = truly_nt35521_prepare,
	.unprepare = truly_nt35521_unprepare,
	.enable = truly_nt35521_enable,
	.disable = truly_nt35521_disable,
	.get_modes = truly_nt35521_get_modes,
	};

	static int truly_nt35521_bl_update_status(struct backlight_device *bl)
	{
	struct mipi_dsi_device *dsi = bl_get_data(bl);
	u16 brightness = backlight_get_brightness(bl);
	int ret;

	ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
	if (ret < 0)
	return ret;

	return 0;
	}

	static int truly_nt35521_bl_get_brightness(struct backlight_device *bl)
	{
	struct mipi_dsi_device *dsi = bl_get_data(bl);
	u16 brightness;
	int ret;

	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
	if (ret < 0)
	return ret;

	return brightness & 0xff;
	}

	static const struct backlight_ops truly_nt35521_bl_ops = {
	.update_status = truly_nt35521_bl_update_status,
	.get_brightness = truly_nt35521_bl_get_brightness,
	};

	static struct backlight_device *
	truly_nt35521_create_backlight(struct mipi_dsi_device *dsi)
	{
	struct device *dev = &dsi->dev;
	const struct backlight_properties props = {
	.type = BACKLIGHT_RAW,
	.brightness = 255,
	.max_brightness = 255,
	};

	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
	&truly_nt35521_bl_ops, &props);
	}

	static int truly_nt35521_probe(struct mipi_dsi_device *dsi)
	{
	struct device *dev = &dsi->dev;
	struct truly_nt35521 *ctx;
	int ret;

	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
	return -ENOMEM;

	ctx->supplies[0].supply = "positive5";
	ctx->supplies[1].supply = "negative5";
	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
	ctx->supplies);
	if (ret < 0) {
	dev_err(dev, "Failed to get regulators: %d\n", ret);
	return ret;
	}

	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(ctx->reset_gpio))
	return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
	"Failed to get reset-gpios\n");

	ctx->blen_gpio = devm_gpiod_get(dev, "backlight", GPIOD_OUT_LOW);
	if (IS_ERR(ctx->blen_gpio))
	return dev_err_probe(dev, PTR_ERR(ctx->blen_gpio),
	"Failed to get backlight-gpios\n");

	ctx->dsi = dsi;
	mipi_dsi_set_drvdata(dsi, ctx);

	dsi->lanes = 4;
	dsi->format = MIPI_DSI_FMT_RGB888;
	dsi->mode_flags = MIPI_DSI_MODE_VIDEO \| MIPI_DSI_MODE_VIDEO_BURST \|
	MIPI_DSI_MODE_VIDEO_HSE \| MIPI_DSI_MODE_NO_EOT_PACKET \|
	MIPI_DSI_CLOCK_NON_CONTINUOUS;

	drm_panel_init(&ctx->panel, dev, &truly_nt35521_panel_funcs,
	DRM_MODE_CONNECTOR_DSI);

	ctx->panel.backlight = truly_nt35521_create_backlight(dsi);
	if (IS_ERR(ctx->panel.backlight))
	return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
	"Failed to create backlight\n");

	drm_panel_add(&ctx->panel);

	ret = mipi_dsi_attach(dsi);
	if (ret < 0) {
	dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
	drm_panel_remove(&ctx->panel);
	return ret;
	}

	return 0;
	}

	static void truly_nt35521_remove(struct mipi_dsi_device *dsi)
	{
	struct truly_nt35521 *ctx = mipi_dsi_get_drvdata(dsi);
	int ret;

	ret = mipi_dsi_detach(dsi);
	if (ret < 0)
	dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);

	drm_panel_remove(&ctx->panel);
	}

	static const struct of_device_id truly_nt35521_of_match[] = {
	{ .compatible = "sony,tulip-truly-nt35521" },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, truly_nt35521_of_match);

	static struct mipi_dsi_driver truly_nt35521_driver = {
	.probe = truly_nt35521_probe,
	.remove = truly_nt35521_remove,
	.driver = {
	.name = "panel-truly-nt35521",
	.of_match_table = truly_nt35521_of_match,
	},
	};
	module_mipi_dsi_driver(truly_nt35521_driver);

	MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
	MODULE_DESCRIPTION("DRM driver for Sony Tulip Truly NT35521 panel");
	MODULE_LICENSE("GPL v2");