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@xxxxxxx>
Cc: Vivien Didelot <vivien.didelot@xxxxxxxxxxxxxxxxxxxx>
Cc: Woojung Huh <woojung.huh@xxxxxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Tristram Ha <Tristram.Ha@xxxxxxxxxxxxx>
---
V2: Switch to devm_gpiod_get_optional()
---
drivers/net/dsa/microchip/ksz_common.c | 17 +++++++++++++++++
drivers/net/dsa/microchip/ksz_priv.h | 2 ++
2 files changed, 19 insertions(+)
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 9705808c3af7a..3b12e2dcff31b 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -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);
diff --git a/drivers/net/dsa/microchip/ksz_priv.h b/drivers/net/dsa/microchip/ksz_priv.h
index a38ff0841ed4e..60b49010904bf 100644
--- a/drivers/net/dsa/microchip/ksz_priv.h
+++ b/drivers/net/dsa/microchip/ksz_priv.h
@@ -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;
--
2.18.0
