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net: dsa: Add support for a switch reset gpio

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Some boards have a gpio line tied to the switch reset pin. Allow this
gpio to be retrieved from the device tree, and take the switch out of
reset before performing the probe.

Signed-off-by: Andrew Lunn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Andrew Lunn 2015-11-20 03:56:23 +01:00 • committed by David S. Miller
commit cc30c16344
3 changed files with 28 additions and 0 deletions
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17
net/dsa/dsa.c
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@ -21,6 +21,7 @@
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/of_net.h>
#include <linux/of_gpio.h>
#include <linux/sysfs.h>
#include <linux/phy_fixed.h>
#include "dsa_priv.h"
@ -688,6 +689,9 @@ static int dsa_of_probe(struct device *dev)
const char *port_name;
int chip_index, port_index;
const unsigned int *sw_addr, *port_reg;
int gpio;
enum of_gpio_flags of_flags;
unsigned long flags;
u32 eeprom_len;
int ret;
@ -766,6 +770,19 @@ static int dsa_of_probe(struct device *dev)
put_device(cd->host_dev);
cd->host_dev = &mdio_bus_switch->dev;
}
gpio = of_get_named_gpio_flags(child, "reset-gpios", 0,
&of_flags);
if (gpio_is_valid(gpio)) {
flags = (of_flags == OF_GPIO_ACTIVE_LOW ?
GPIOF_ACTIVE_LOW : 0);
ret = devm_gpio_request_one(dev, gpio, flags,
"switch_reset");
if (ret)
goto out_free_chip;
cd->reset = gpio_to_desc(gpio);
gpiod_direction_output(cd->reset, 0);
}
for_each_available_child_of_node(child, port) {
port_reg = of_get_property(port, "reg", NULL);