diff options
| -rw-r--r-- | Documentation/devicetree/bindings/net/dsa/dsa.txt | 3 | ||||
| -rw-r--r-- | include/net/dsa.h | 8 | ||||
| -rw-r--r-- | net/dsa/dsa.c | 17 |
3 files changed, 28 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/net/dsa/dsa.txt b/Documentation/devicetree/bindings/net/dsa/dsa.txt index 04e6bef3ac3f..5fdbbcdf8c4b 100644 --- a/Documentation/devicetree/bindings/net/dsa/dsa.txt +++ b/Documentation/devicetree/bindings/net/dsa/dsa.txt @@ -31,6 +31,8 @@ A switch child node has the following optional property: switch. Must be set if the switch can not detect the presence and/or size of a connected EEPROM, otherwise optional. +- reset-gpios : phandle and specifier to a gpio line connected to + reset pin of the switch chip. A switch may have multiple "port" children nodes @@ -114,6 +116,7 @@ Example: #size-cells = <0>; reg = <17 1>; /* MDIO address 17, switch 1 in tree */ mii-bus = <&mii_bus1>; + reset-gpios = <&gpio5 1 GPIO_ACTIVE_LOW>; switch1port0: port@0 { reg = <0>; diff --git a/include/net/dsa.h b/include/net/dsa.h index 82a4c6011173..3f23dd9d6a69 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -16,6 +16,7 @@ #include <linux/timer.h> #include <linux/workqueue.h> #include <linux/of.h> +#include <linux/of_gpio.h> #include <linux/phy.h> #include <linux/phy_fixed.h> #include <linux/ethtool.h> @@ -64,6 +65,13 @@ struct dsa_chip_data { * NULL if there is only one switch chip. */ s8 *rtable; + + /* + * A switch may have a GPIO line tied to its reset pin. Parse + * this from the device tree, and use it before performing + * switch soft reset. + */ + struct gpio_desc *reset; }; struct dsa_platform_data { diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c index 1eba07feb34a..0b5565f923cc 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); |