drivers/gpu/drm/imx/ipuv3/parallel-display.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * i.MX drm driver - parallel display implementation
  *
  * Copyright (C) 2012 Sascha Hauer, Pengutronix
  */

 #include <linux/component.h>
 #include <linux/media-bus-format.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/videodev2.h>

 #include <video/of_display_timing.h>

 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_managed.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_simple_kms_helper.h>

 #include "imx-drm.h"

 struct imx_parallel_display_encoder {
 	struct drm_connector connector;
 	struct drm_encoder encoder;
 	struct drm_bridge bridge;
 	struct imx_parallel_display *pd;
 };

 struct imx_parallel_display {
 	struct device *dev;
 	const struct drm_edid *drm_edid;
 	u32 bus_format;
 	u32 bus_flags;
 	struct drm_display_mode mode;
 	struct drm_panel *panel;
 	struct drm_bridge *next_bridge;
 };

 static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
 {
 	return container_of(c, struct imx_parallel_display_encoder, connector)->pd;
 }

 static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)
 {
 	return container_of(b, struct imx_parallel_display_encoder, bridge)->pd;
 }

 static int imx_pd_connector_get_modes(struct drm_connector *connector)
 {
 	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
 	struct device_node *np = imxpd->dev->of_node;
 	int num_modes;

 	num_modes = drm_panel_get_modes(imxpd->panel, connector);
 	if (num_modes > 0)
 		return num_modes;

 	if (imxpd->drm_edid) {
 		drm_edid_connector_update(connector, imxpd->drm_edid);
 		num_modes = drm_edid_connector_add_modes(connector);
 	}

 	if (np) {
 		struct drm_display_mode *mode = drm_mode_create(connector->dev);
 		int ret;

 		if (!mode)
 			return 0;

 		ret = of_get_drm_display_mode(np, &imxpd->mode,
 					      &imxpd->bus_flags,
 					      OF_USE_NATIVE_MODE);
 		if (ret) {
 			drm_mode_destroy(connector->dev, mode);
 			return 0;
 		}

 		drm_mode_copy(mode, &imxpd->mode);
 		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 		drm_mode_probed_add(connector, mode);
 		num_modes++;
 	}

 	return num_modes;
 }

 static void imx_pd_bridge_enable(struct drm_bridge *bridge)
 {
 	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);

 	drm_panel_prepare(imxpd->panel);
 	drm_panel_enable(imxpd->panel);
 }

 static void imx_pd_bridge_disable(struct drm_bridge *bridge)
 {
 	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);

 	drm_panel_disable(imxpd->panel);
 	drm_panel_unprepare(imxpd->panel);
 }

 static const u32 imx_pd_bus_fmts[] = {
 	MEDIA_BUS_FMT_RGB888_1X24,
 	MEDIA_BUS_FMT_BGR888_1X24,
 	MEDIA_BUS_FMT_GBR888_1X24,
 	MEDIA_BUS_FMT_RGB666_1X18,
 	MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
 	MEDIA_BUS_FMT_RGB565_1X16,
 };

 static u32 *
 imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
 					 struct drm_bridge_state *bridge_state,
 					 struct drm_crtc_state *crtc_state,
 					 struct drm_connector_state *conn_state,
 					 unsigned int *num_output_fmts)
 {
 	struct drm_display_info *di = &conn_state->connector->display_info;
 	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
 	u32 *output_fmts;

 	if (!imxpd->bus_format && !di->num_bus_formats) {
 		*num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
 		return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
 			       GFP_KERNEL);
 	}

 	*num_output_fmts = 1;
 	output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
 	if (!output_fmts)
 		return NULL;

 	if (!imxpd->bus_format && di->num_bus_formats)
 		output_fmts[0] = di->bus_formats[0];
 	else
 		output_fmts[0] = imxpd->bus_format;

 	return output_fmts;
 }

 static bool imx_pd_format_supported(u32 output_fmt)
 {
 	unsigned int i;

 	for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
 		if (imx_pd_bus_fmts[i] == output_fmt)
 			return true;
 	}

 	return false;
 }

 static u32 *
 imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
 					struct drm_bridge_state *bridge_state,
 					struct drm_crtc_state *crtc_state,
 					struct drm_connector_state *conn_state,
 					u32 output_fmt,
 					unsigned int *num_input_fmts)
 {
 	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
 	u32 *input_fmts;

 	/*
 	 * If the next bridge does not support bus format negotiation, let's
 	 * use the static bus format definition (imxpd->bus_format) if it's
 	 * specified, RGB888 when it's not.
 	 */
 	if (output_fmt == MEDIA_BUS_FMT_FIXED)
 		output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;

 	/* Now make sure the requested output format is supported. */
 	if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||
 	    !imx_pd_format_supported(output_fmt)) {
 		*num_input_fmts = 0;
 		return NULL;
 	}

 	*num_input_fmts = 1;
 	input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
 	if (!input_fmts)
 		return NULL;

 	input_fmts[0] = output_fmt;
 	return input_fmts;
 }

 static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,
 				      struct drm_bridge_state *bridge_state,
 				      struct drm_crtc_state *crtc_state,
 				      struct drm_connector_state *conn_state)
 {
 	struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 	struct drm_display_info *di = &conn_state->connector->display_info;
 	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
 	struct drm_bridge_state *next_bridge_state = NULL;
 	struct drm_bridge *next_bridge;
 	u32 bus_flags, bus_fmt;

 	next_bridge = drm_bridge_get_next_bridge(bridge);
 	if (next_bridge)
 		next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
 								    next_bridge);

 	if (next_bridge_state)
 		bus_flags = next_bridge_state->input_bus_cfg.flags;
 	else if (di->num_bus_formats)
 		bus_flags = di->bus_flags;
 	else
 		bus_flags = imxpd->bus_flags;

 	bus_fmt = bridge_state->input_bus_cfg.format;
 	if (!imx_pd_format_supported(bus_fmt))
 		return -EINVAL;

 	bridge_state->output_bus_cfg.flags = bus_flags;
 	bridge_state->input_bus_cfg.flags = bus_flags;
 	imx_crtc_state->bus_flags = bus_flags;
 	imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
 	imx_crtc_state->di_hsync_pin = 2;
 	imx_crtc_state->di_vsync_pin = 3;

 	return 0;
 }

 static const struct drm_connector_funcs imx_pd_connector_funcs = {
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.destroy = imx_drm_connector_destroy,
 	.reset = drm_atomic_helper_connector_reset,
 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };

 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 	.get_modes = imx_pd_connector_get_modes,
 };

 static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
 	.enable = imx_pd_bridge_enable,
 	.disable = imx_pd_bridge_disable,
 	.atomic_reset = drm_atomic_helper_bridge_reset,
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 	.atomic_check = imx_pd_bridge_atomic_check,
 	.atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
 	.atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
 };

 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 {
 	struct drm_device *drm = data;
 	struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 	struct imx_parallel_display_encoder *imxpd_encoder;
 	struct drm_connector *connector;
 	struct drm_encoder *encoder;
 	struct drm_bridge *bridge;
 	int ret;

 	imxpd_encoder = drmm_simple_encoder_alloc(drm, struct imx_parallel_display_encoder,
 						  encoder, DRM_MODE_ENCODER_NONE);
 	if (IS_ERR(imxpd_encoder))
 		return PTR_ERR(imxpd_encoder);

 	imxpd_encoder->pd = imxpd;
 	connector = &imxpd_encoder->connector;
 	encoder = &imxpd_encoder->encoder;
 	bridge = &imxpd_encoder->bridge;

 	ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
 	if (ret)
 		return ret;

 	/* set the connector's dpms to OFF so that
 	 * drm_helper_connector_dpms() won't return
 	 * immediately since the current state is ON
 	 * at this point.
 	 */
 	connector->dpms = DRM_MODE_DPMS_OFF;

 	bridge->funcs = &imx_pd_bridge_funcs;
 	drm_bridge_attach(encoder, bridge, NULL, 0);

 	if (imxpd->next_bridge) {
 		ret = drm_bridge_attach(encoder, imxpd->next_bridge, bridge, 0);
 		if (ret < 0)
 			return ret;
 	} else {
 		drm_connector_helper_add(connector,
 					 &imx_pd_connector_helper_funcs);
 		drm_connector_init(drm, connector, &imx_pd_connector_funcs,
 				   DRM_MODE_CONNECTOR_DPI);

 		drm_connector_attach_encoder(connector, encoder);
 	}

 	return 0;
 }

 static const struct component_ops imx_pd_ops = {
 	.bind	= imx_pd_bind,
 };

 static int imx_pd_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	const u8 *edidp;
 	struct imx_parallel_display *imxpd;
 	int edid_len;
 	int ret;
 	u32 bus_format = 0;
 	const char *fmt;

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

 	/* port@1 is the output port */
 	ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
 					  &imxpd->next_bridge);
 	if (ret && ret != -ENODEV)
 		return ret;

 	edidp = of_get_property(np, "edid", &edid_len);
 	if (edidp)
 		imxpd->drm_edid = drm_edid_alloc(edidp, edid_len);

 	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 	if (!ret) {
 		if (!strcmp(fmt, "rgb24"))
 			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 		else if (!strcmp(fmt, "rgb565"))
 			bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 		else if (!strcmp(fmt, "bgr666"))
 			bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 		else if (!strcmp(fmt, "lvds666"))
 			bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 	}
 	imxpd->bus_format = bus_format;

 	imxpd->dev = dev;

 	platform_set_drvdata(pdev, imxpd);

 	return component_add(dev, &imx_pd_ops);
 }

 static void imx_pd_remove(struct platform_device *pdev)
 {
 	struct imx_parallel_display *imxpd = platform_get_drvdata(pdev);

 	component_del(&pdev->dev, &imx_pd_ops);

 	drm_edid_free(imxpd->drm_edid);
 }

 static const struct of_device_id imx_pd_dt_ids[] = {
 	{ .compatible = "fsl,imx-parallel-display", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);

 static struct platform_driver imx_pd_driver = {
 	.probe		= imx_pd_probe,
 	.remove_new	= imx_pd_remove,
 	.driver		= {
 		.of_match_table = imx_pd_dt_ids,
 		.name	= "imx-parallel-display",
 	},
 };

 module_platform_driver(imx_pd_driver);

 MODULE_DESCRIPTION("i.MX parallel display driver");
 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:imx-parallel-display");
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* i.MX drm driver - parallel display implementation
	*
	* Copyright (C) 2012 Sascha Hauer, Pengutronix
	*/

	#include <linux/component.h>
	#include <linux/media-bus-format.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/videodev2.h>

	#include <video/of_display_timing.h>

	#include <drm/drm_atomic_helper.h>
	#include <drm/drm_bridge.h>
	#include <drm/drm_edid.h>
	#include <drm/drm_managed.h>
	#include <drm/drm_of.h>
	#include <drm/drm_panel.h>
	#include <drm/drm_probe_helper.h>
	#include <drm/drm_simple_kms_helper.h>

	#include "imx-drm.h"

	struct imx_parallel_display_encoder {
	struct drm_connector connector;
	struct drm_encoder encoder;
	struct drm_bridge bridge;
	struct imx_parallel_display *pd;
	};

	struct imx_parallel_display {
	struct device *dev;
	const struct drm_edid *drm_edid;
	u32 bus_format;
	u32 bus_flags;
	struct drm_display_mode mode;
	struct drm_panel *panel;
	struct drm_bridge *next_bridge;
	};

	static inline struct imx_parallel_display con_to_imxpd(struct drm_connector c)
	{
	return container_of(c, struct imx_parallel_display_encoder, connector)->pd;
	}

	static inline struct imx_parallel_display bridge_to_imxpd(struct drm_bridge b)
	{
	return container_of(b, struct imx_parallel_display_encoder, bridge)->pd;
	}

	static int imx_pd_connector_get_modes(struct drm_connector *connector)
	{
	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
	struct device_node *np = imxpd->dev->of_node;
	int num_modes;

	num_modes = drm_panel_get_modes(imxpd->panel, connector);
	if (num_modes > 0)
	return num_modes;

	if (imxpd->drm_edid) {
	drm_edid_connector_update(connector, imxpd->drm_edid);
	num_modes = drm_edid_connector_add_modes(connector);
	}

	if (np) {
	struct drm_display_mode *mode = drm_mode_create(connector->dev);
	int ret;

	if (!mode)
	return 0;

	ret = of_get_drm_display_mode(np, &imxpd->mode,
	&imxpd->bus_flags,
	OF_USE_NATIVE_MODE);
	if (ret) {
	drm_mode_destroy(connector->dev, mode);
	return 0;
	}

	drm_mode_copy(mode, &imxpd->mode);
	mode->type \|= DRM_MODE_TYPE_DRIVER \| DRM_MODE_TYPE_PREFERRED;
	drm_mode_probed_add(connector, mode);
	num_modes++;
	}

	return num_modes;
	}

	static void imx_pd_bridge_enable(struct drm_bridge *bridge)
	{
	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);

	drm_panel_prepare(imxpd->panel);
	drm_panel_enable(imxpd->panel);
	}

	static void imx_pd_bridge_disable(struct drm_bridge *bridge)
	{
	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);

	drm_panel_disable(imxpd->panel);
	drm_panel_unprepare(imxpd->panel);
	}

	static const u32 imx_pd_bus_fmts[] = {
	MEDIA_BUS_FMT_RGB888_1X24,
	MEDIA_BUS_FMT_BGR888_1X24,
	MEDIA_BUS_FMT_GBR888_1X24,
	MEDIA_BUS_FMT_RGB666_1X18,
	MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
	MEDIA_BUS_FMT_RGB565_1X16,
	};

	static u32 *
	imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
	struct drm_bridge_state *bridge_state,
	struct drm_crtc_state *crtc_state,
	struct drm_connector_state *conn_state,
	unsigned int *num_output_fmts)
	{
	struct drm_display_info *di = &conn_state->connector->display_info;
	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
	u32 *output_fmts;

	if (!imxpd->bus_format && !di->num_bus_formats) {
	*num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
	return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
	GFP_KERNEL);
	}

	*num_output_fmts = 1;
	output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
	if (!output_fmts)
	return NULL;

	if (!imxpd->bus_format && di->num_bus_formats)
	output_fmts[0] = di->bus_formats[0];
	else
	output_fmts[0] = imxpd->bus_format;

	return output_fmts;
	}

	static bool imx_pd_format_supported(u32 output_fmt)
	{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
	if (imx_pd_bus_fmts[i] == output_fmt)
	return true;
	}

	return false;
	}

	static u32 *
	imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
	struct drm_bridge_state *bridge_state,
	struct drm_crtc_state *crtc_state,
	struct drm_connector_state *conn_state,
	u32 output_fmt,
	unsigned int *num_input_fmts)
	{
	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
	u32 *input_fmts;

	/*
	* If the next bridge does not support bus format negotiation, let's
	* use the static bus format definition (imxpd->bus_format) if it's
	* specified, RGB888 when it's not.
	*/
	if (output_fmt == MEDIA_BUS_FMT_FIXED)
	output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;

	/* Now make sure the requested output format is supported. */
	if ((imxpd->bus_format && imxpd->bus_format != output_fmt) \|\|
	!imx_pd_format_supported(output_fmt)) {
	*num_input_fmts = 0;
	return NULL;
	}

	*num_input_fmts = 1;
	input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
	if (!input_fmts)
	return NULL;

	input_fmts[0] = output_fmt;
	return input_fmts;
	}

	static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,
	struct drm_bridge_state *bridge_state,
	struct drm_crtc_state *crtc_state,
	struct drm_connector_state *conn_state)
	{
	struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
	struct drm_display_info *di = &conn_state->connector->display_info;
	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
	struct drm_bridge_state *next_bridge_state = NULL;
	struct drm_bridge *next_bridge;
	u32 bus_flags, bus_fmt;

	next_bridge = drm_bridge_get_next_bridge(bridge);
	if (next_bridge)
	next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
	next_bridge);

	if (next_bridge_state)
	bus_flags = next_bridge_state->input_bus_cfg.flags;
	else if (di->num_bus_formats)
	bus_flags = di->bus_flags;
	else
	bus_flags = imxpd->bus_flags;

	bus_fmt = bridge_state->input_bus_cfg.format;
	if (!imx_pd_format_supported(bus_fmt))
	return -EINVAL;

	bridge_state->output_bus_cfg.flags = bus_flags;
	bridge_state->input_bus_cfg.flags = bus_flags;
	imx_crtc_state->bus_flags = bus_flags;
	imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
	imx_crtc_state->di_hsync_pin = 2;
	imx_crtc_state->di_vsync_pin = 3;

	return 0;
	}

	static const struct drm_connector_funcs imx_pd_connector_funcs = {
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = imx_drm_connector_destroy,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
	};

	static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
	.get_modes = imx_pd_connector_get_modes,
	};

	static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
	.enable = imx_pd_bridge_enable,
	.disable = imx_pd_bridge_disable,
	.atomic_reset = drm_atomic_helper_bridge_reset,
	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
	.atomic_check = imx_pd_bridge_atomic_check,
	.atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
	.atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
	};

	static int imx_pd_bind(struct device dev, struct device master, void *data)
	{
	struct drm_device *drm = data;
	struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
	struct imx_parallel_display_encoder *imxpd_encoder;
	struct drm_connector *connector;
	struct drm_encoder *encoder;
	struct drm_bridge *bridge;
	int ret;

	imxpd_encoder = drmm_simple_encoder_alloc(drm, struct imx_parallel_display_encoder,
	encoder, DRM_MODE_ENCODER_NONE);
	if (IS_ERR(imxpd_encoder))
	return PTR_ERR(imxpd_encoder);

	imxpd_encoder->pd = imxpd;
	connector = &imxpd_encoder->connector;
	encoder = &imxpd_encoder->encoder;
	bridge = &imxpd_encoder->bridge;

	ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
	if (ret)
	return ret;

	/* set the connector's dpms to OFF so that
	* drm_helper_connector_dpms() won't return
	* immediately since the current state is ON
	* at this point.
	*/
	connector->dpms = DRM_MODE_DPMS_OFF;

	bridge->funcs = &imx_pd_bridge_funcs;
	drm_bridge_attach(encoder, bridge, NULL, 0);

	if (imxpd->next_bridge) {
	ret = drm_bridge_attach(encoder, imxpd->next_bridge, bridge, 0);
	if (ret < 0)
	return ret;
	} else {
	drm_connector_helper_add(connector,
	&imx_pd_connector_helper_funcs);
	drm_connector_init(drm, connector, &imx_pd_connector_funcs,
	DRM_MODE_CONNECTOR_DPI);

	drm_connector_attach_encoder(connector, encoder);
	}

	return 0;
	}

	static const struct component_ops imx_pd_ops = {
	.bind = imx_pd_bind,
	};

	static int imx_pd_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	const u8 *edidp;
	struct imx_parallel_display *imxpd;
	int edid_len;
	int ret;
	u32 bus_format = 0;
	const char *fmt;

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

	/* port@1 is the output port */
	ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
	&imxpd->next_bridge);
	if (ret && ret != -ENODEV)
	return ret;

	edidp = of_get_property(np, "edid", &edid_len);
	if (edidp)
	imxpd->drm_edid = drm_edid_alloc(edidp, edid_len);

	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
	if (!ret) {
	if (!strcmp(fmt, "rgb24"))
	bus_format = MEDIA_BUS_FMT_RGB888_1X24;
	else if (!strcmp(fmt, "rgb565"))
	bus_format = MEDIA_BUS_FMT_RGB565_1X16;
	else if (!strcmp(fmt, "bgr666"))
	bus_format = MEDIA_BUS_FMT_RGB666_1X18;
	else if (!strcmp(fmt, "lvds666"))
	bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
	}
	imxpd->bus_format = bus_format;

	imxpd->dev = dev;

	platform_set_drvdata(pdev, imxpd);

	return component_add(dev, &imx_pd_ops);
	}

	static void imx_pd_remove(struct platform_device *pdev)
	{
	struct imx_parallel_display *imxpd = platform_get_drvdata(pdev);

	component_del(&pdev->dev, &imx_pd_ops);

	drm_edid_free(imxpd->drm_edid);
	}

	static const struct of_device_id imx_pd_dt_ids[] = {
	{ .compatible = "fsl,imx-parallel-display", },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);

	static struct platform_driver imx_pd_driver = {
	.probe = imx_pd_probe,
	.remove_new = imx_pd_remove,
	.driver = {
	.of_match_table = imx_pd_dt_ids,
	.name = "imx-parallel-display",
	},
	};

	module_platform_driver(imx_pd_driver);

	MODULE_DESCRIPTION("i.MX parallel display driver");
	MODULE_AUTHOR("Sascha Hauer, Pengutronix");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:imx-parallel-display");