| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Microchip KSZ8795 series register access through SPI |
| * |
| * Copyright (C) 2017 Microchip Technology Inc. |
| * Tristram Ha <Tristram.Ha@microchip.com> |
| */ |
| |
| #include <asm/unaligned.h> |
| |
| #include <linux/delay.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/regmap.h> |
| #include <linux/spi/spi.h> |
| |
| #include "ksz_common.h" |
| |
| #define SPI_ADDR_SHIFT 12 |
| #define SPI_ADDR_ALIGN 3 |
| #define SPI_TURNAROUND_SHIFT 1 |
| |
| KSZ_REGMAP_TABLE(ksz8795, 16, SPI_ADDR_SHIFT, |
| SPI_TURNAROUND_SHIFT, SPI_ADDR_ALIGN); |
| |
| static int ksz8795_spi_probe(struct spi_device *spi) |
| { |
| struct ksz_device *dev; |
| int i, ret; |
| |
| dev = ksz_switch_alloc(&spi->dev, spi); |
| if (!dev) |
| return -ENOMEM; |
| |
| for (i = 0; i < ARRAY_SIZE(ksz8795_regmap_config); i++) { |
| dev->regmap[i] = devm_regmap_init_spi(spi, |
| &ksz8795_regmap_config |
| [i]); |
| if (IS_ERR(dev->regmap[i])) { |
| ret = PTR_ERR(dev->regmap[i]); |
| dev_err(&spi->dev, |
| "Failed to initialize regmap%i: %d\n", |
| ksz8795_regmap_config[i].val_bits, ret); |
| return ret; |
| } |
| } |
| |
| if (spi->dev.platform_data) |
| dev->pdata = spi->dev.platform_data; |
| |
| ret = ksz8795_switch_register(dev); |
| |
| /* Main DSA driver may not be started yet. */ |
| if (ret) |
| return ret; |
| |
| spi_set_drvdata(spi, dev); |
| |
| return 0; |
| } |
| |
| static int ksz8795_spi_remove(struct spi_device *spi) |
| { |
| struct ksz_device *dev = spi_get_drvdata(spi); |
| |
| if (dev) |
| ksz_switch_remove(dev); |
| |
| return 0; |
| } |
| |
| static void ksz8795_spi_shutdown(struct spi_device *spi) |
| { |
| struct ksz_device *dev = spi_get_drvdata(spi); |
| |
| if (dev && dev->dev_ops->shutdown) |
| dev->dev_ops->shutdown(dev); |
| } |
| |
| static const struct of_device_id ksz8795_dt_ids[] = { |
| { .compatible = "microchip,ksz8765" }, |
| { .compatible = "microchip,ksz8794" }, |
| { .compatible = "microchip,ksz8795" }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, ksz8795_dt_ids); |
| |
| static struct spi_driver ksz8795_spi_driver = { |
| .driver = { |
| .name = "ksz8795-switch", |
| .owner = THIS_MODULE, |
| .of_match_table = of_match_ptr(ksz8795_dt_ids), |
| }, |
| .probe = ksz8795_spi_probe, |
| .remove = ksz8795_spi_remove, |
| .shutdown = ksz8795_spi_shutdown, |
| }; |
| |
| module_spi_driver(ksz8795_spi_driver); |
| |
| MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>"); |
| MODULE_DESCRIPTION("Microchip KSZ8795 Series Switch SPI Driver"); |
| MODULE_LICENSE("GPL"); |