1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Microchip KSZ8795 series register access through SPI
5 * Copyright (C) 2017 Microchip Technology Inc.
6 * Tristram Ha <Tristram.Ha@microchip.com>
9 #include <asm/unaligned.h>
11 #include <linux/delay.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/regmap.h>
15 #include <linux/spi/spi.h>
17 #include "ksz_common.h"
19 #define SPI_ADDR_SHIFT 12
20 #define SPI_ADDR_ALIGN 3
21 #define SPI_TURNAROUND_SHIFT 1
23 KSZ_REGMAP_TABLE(ksz8795, 16, SPI_ADDR_SHIFT,
24 SPI_TURNAROUND_SHIFT, SPI_ADDR_ALIGN);
26 static int ksz8795_spi_probe(struct spi_device *spi)
28 struct ksz_device *dev;
31 dev = ksz_switch_alloc(&spi->dev, spi);
35 for (i = 0; i < ARRAY_SIZE(ksz8795_regmap_config); i++) {
36 dev->regmap[i] = devm_regmap_init_spi(spi,
37 &ksz8795_regmap_config
39 if (IS_ERR(dev->regmap[i])) {
40 ret = PTR_ERR(dev->regmap[i]);
42 "Failed to initialize regmap%i: %d\n",
43 ksz8795_regmap_config[i].val_bits, ret);
48 if (spi->dev.platform_data)
49 dev->pdata = spi->dev.platform_data;
51 ret = ksz8795_switch_register(dev);
53 /* Main DSA driver may not be started yet. */
57 spi_set_drvdata(spi, dev);
62 static int ksz8795_spi_remove(struct spi_device *spi)
64 struct ksz_device *dev = spi_get_drvdata(spi);
67 ksz_switch_remove(dev);
72 static void ksz8795_spi_shutdown(struct spi_device *spi)
74 struct ksz_device *dev = spi_get_drvdata(spi);
76 if (dev && dev->dev_ops->shutdown)
77 dev->dev_ops->shutdown(dev);
80 static const struct of_device_id ksz8795_dt_ids[] = {
81 { .compatible = "microchip,ksz8765" },
82 { .compatible = "microchip,ksz8794" },
83 { .compatible = "microchip,ksz8795" },
86 MODULE_DEVICE_TABLE(of, ksz8795_dt_ids);
88 static struct spi_driver ksz8795_spi_driver = {
90 .name = "ksz8795-switch",
92 .of_match_table = of_match_ptr(ksz8795_dt_ids),
94 .probe = ksz8795_spi_probe,
95 .remove = ksz8795_spi_remove,
96 .shutdown = ksz8795_spi_shutdown,
99 module_spi_driver(ksz8795_spi_driver);
101 MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
102 MODULE_DESCRIPTION("Microchip KSZ8795 Series Switch SPI Driver");
103 MODULE_LICENSE("GPL");