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Commit 924352c3 authored by Marek Vasut's avatar Marek Vasut Committed by David S. Miller
Browse files

net: dsa: ksz: Add reset GPIO handling 



Add code to handle optional reset GPIO in the KSZ switch driver. The switch
has a reset GPIO line which can be controlled by the CPU, so make sure it is
configured correctly in such setups.

Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Cc: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Cc: Woojung Huh <woojung.huh@microchip.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Tristram Ha <Tristram.Ha@microchip.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a324d6e4

drivers/net/dsa/microchip/ksz_common.c

+17 −0
Original line number Diff line number Diff line
@@ -8,12 +8,14 @@ 
#include <linux/delay.h>

#include <linux/export.h>

#include <linux/gpio.h>

#include <linux/gpio/consumer.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_data/microchip-ksz.h>

#include <linux/phy.h>

#include <linux/etherdevice.h>

#include <linux/if_bridge.h>

#include <linux/of_gpio.h>

#include <linux/of_net.h>

#include <net/dsa.h>

#include <net/switchdev.h>
@@ -294,6 +296,17 @@ int ksz_switch_register(struct ksz_device *dev, 
	if (dev->pdata)

		dev->chip_id = dev->pdata->chip_id;



	dev->reset_gpio = devm_gpiod_get_optional(dev->dev, "reset",

						  GPIOD_OUT_LOW);

	if (IS_ERR(dev->reset_gpio))

		return PTR_ERR(dev->reset_gpio);



	if (dev->reset_gpio) {

		gpiod_set_value(dev->reset_gpio, 1);

		mdelay(10);

		gpiod_set_value(dev->reset_gpio, 0);

	}



	mutex_init(&dev->reg_mutex);

	mutex_init(&dev->stats_mutex);

	mutex_init(&dev->alu_mutex);
@@ -329,6 +342,10 @@ void ksz_switch_remove(struct ksz_device *dev) 
{

	dev->dev_ops->exit(dev);

	dsa_unregister_switch(dev->ds);



	if (dev->reset_gpio)

		gpiod_set_value(dev->reset_gpio, 1);



}

EXPORT_SYMBOL(ksz_switch_remove);

drivers/net/dsa/microchip/ksz_priv.h

+2 −0
Original line number Diff line number Diff line
@@ -59,6 +59,8 @@ struct ksz_device { 


	void *priv;



	struct gpio_desc *reset_gpio;	/* Optional reset GPIO */



	/* chip specific data */

	u32 chip_id;

	int num_vlans;