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Commit e66f840c authored by Tristram Ha's avatar Tristram Ha Committed by David S. Miller
Browse files

net: dsa: ksz: Add Microchip KSZ8795 DSA driver 



Add Microchip KSZ8795 DSA driver.

Signed-off-by: default avatarTristram Ha <Tristram.Ha@microchip.com>
Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: David S. Miller <davem@davemloft.net>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Tristram Ha <Tristram.Ha@microchip.com>
Cc: Vivien Didelot <vivien.didelot@gmail.com>
Cc: Woojung Huh <woojung.huh@microchip.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 016e43a2

drivers/net/dsa/microchip/Kconfig

+17 −0
Original line number Diff line number Diff line
@@ -16,3 +16,20 @@ config NET_DSA_MICROCHIP_KSZ9477_SPI 
	select REGMAP_SPI

	help

	  Select to enable support for registering switches configured through SPI.



menuconfig NET_DSA_MICROCHIP_KSZ8795

	tristate "Microchip KSZ8795 series switch support"

	depends on NET_DSA

	select NET_DSA_MICROCHIP_KSZ_COMMON

	help

	  This driver adds support for Microchip KSZ8795 switch chips.



config NET_DSA_MICROCHIP_KSZ8795_SPI

	tristate "KSZ8795 series SPI connected switch driver"

	depends on NET_DSA_MICROCHIP_KSZ8795 && SPI

	select REGMAP_SPI

	help

	  This driver accesses KSZ8795 chip through SPI.



	  It is required to use the KSZ8795 switch driver as the only access

	  is through SPI.

drivers/net/dsa/microchip/Makefile

+2 −0
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@@ -2,3 +2,5 @@ 
obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ_COMMON)	+= ksz_common.o

obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ9477)		+= ksz9477.o

obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ9477_SPI)	+= ksz9477_spi.o

obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ8795)		+= ksz8795.o

obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ8795_SPI)	+= ksz8795_spi.o

drivers/net/dsa/microchip/ksz8795.c

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+1311 −0

File added.

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drivers/net/dsa/microchip/ksz8795_reg.h

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+1004 −0

File added.

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drivers/net/dsa/microchip/ksz8795_spi.c

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// 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_priv.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");