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net: dsa: ksz: Add reset GPIO handling

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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: Marek 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: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marek Vasut 2018-12-10 14:43:06 +01:00 committed by David S. Miller
parent a324d6e454
commit 924352c3d6
2 changed files with 19 additions and 0 deletions
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17
drivers/net/dsa/microchip/ksz_common.c
View File

@ -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);

2
drivers/net/dsa/microchip/ksz_priv.h
View File

@ -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;