diff options
| author | Andrew Lunn <andrew@lunn.ch> | 2015-11-20 02:56:23 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-11-23 16:53:10 (GMT) |
| commit | cc30c16344fc3a25153175c7eb9037b2136cd466 (patch) | |
| tree | 47beff192fa89bd934323581f5cc9fed18052a0a /net/dsa | |
| parent | 3f8c0f7efb4fcac11f31afa97584d06118c614bb (diff) | |
| download | linux-cc30c16344fc3a25153175c7eb9037b2136cd466.tar.xz | |
net: dsa: Add support for a switch reset gpio
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 <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa')
| -rw-r--r-- | net/dsa/dsa.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c index 1eba07f..0b5565f 100644 --- a/net/dsa/dsa.c +++ b/net/dsa/dsa.c @@ -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); |