// 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 regmap_config rc; 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++) { rc = ksz8795_regmap_config[i]; rc.lock_arg = &dev->regmap_mutex; dev->regmap[i] = devm_regmap_init_spi(spi, &rc); 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");