diff options
Diffstat (limited to 'target/linux/brcm63xx/patches-4.4/001-4.12-07-mdio_bus-Issue-GPIO-RESET-to-PHYs.patch')
| -rw-r--r-- | target/linux/brcm63xx/patches-4.4/001-4.12-07-mdio_bus-Issue-GPIO-RESET-to-PHYs.patch | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/target/linux/brcm63xx/patches-4.4/001-4.12-07-mdio_bus-Issue-GPIO-RESET-to-PHYs.patch b/target/linux/brcm63xx/patches-4.4/001-4.12-07-mdio_bus-Issue-GPIO-RESET-to-PHYs.patch deleted file mode 100644 index aa813f3d98..0000000000 --- a/target/linux/brcm63xx/patches-4.4/001-4.12-07-mdio_bus-Issue-GPIO-RESET-to-PHYs.patch +++ /dev/null @@ -1,192 +0,0 @@ -From 69226896ad636b94f6d2e55d75ff21a29c4de83b Mon Sep 17 00:00:00 2001 -From: Roger Quadros <rogerq@ti.com> -Date: Fri, 21 Apr 2017 16:15:38 +0300 -Subject: [PATCH] mdio_bus: Issue GPIO RESET to PHYs. - -Some boards [1] leave the PHYs at an invalid state -during system power-up or reset thus causing unreliability -issues with the PHY which manifests as PHY not being detected -or link not functional. To fix this, these PHYs need to be RESET -via a GPIO connected to the PHY's RESET pin. - -Some boards have a single GPIO controlling the PHY RESET pin of all -PHYs on the bus whereas some others have separate GPIOs controlling -individual PHY RESETs. - -In both cases, the RESET de-assertion cannot be done in the PHY driver -as the PHY will not probe till its reset is de-asserted. -So do the RESET de-assertion in the MDIO bus driver. - -[1] - am572x-idk, am571x-idk, a437x-idk - -Signed-off-by: Roger Quadros <rogerq@ti.com> -Signed-off-by: David S. Miller <davem@davemloft.net> ---- - Documentation/devicetree/bindings/net/mdio.txt | 33 ++++++++++++++++++ - drivers/net/phy/mdio_bus.c | 47 ++++++++++++++++++++++++++ - drivers/of/of_mdio.c | 7 ++++ - include/linux/phy.h | 7 ++++ - 4 files changed, 94 insertions(+) - create mode 100644 Documentation/devicetree/bindings/net/mdio.txt - ---- /dev/null -+++ b/Documentation/devicetree/bindings/net/mdio.txt -@@ -0,0 +1,33 @@ -+Common MDIO bus properties. -+ -+These are generic properties that can apply to any MDIO bus. -+ -+Optional properties: -+- reset-gpios: List of one or more GPIOs that control the RESET lines -+ of the PHYs on that MDIO bus. -+- reset-delay-us: RESET pulse width in microseconds as per PHY datasheet. -+ -+A list of child nodes, one per device on the bus is expected. These -+should follow the generic phy.txt, or a device specific binding document. -+ -+Example : -+This example shows these optional properties, plus other properties -+required for the TI Davinci MDIO driver. -+ -+ davinci_mdio: ethernet@0x5c030000 { -+ compatible = "ti,davinci_mdio"; -+ reg = <0x5c030000 0x1000>; -+ #address-cells = <1>; -+ #size-cells = <0>; -+ -+ reset-gpios = <&gpio2 5 GPIO_ACTIVE_LOW>; -+ reset-delay-us = <2>; /* PHY datasheet states 1us min */ -+ -+ ethphy0: ethernet-phy@1 { -+ reg = <1>; -+ }; -+ -+ ethphy1: ethernet-phy@3 { -+ reg = <3>; -+ }; -+ }; ---- a/drivers/net/phy/mdio_bus.c -+++ b/drivers/net/phy/mdio_bus.c -@@ -22,8 +22,11 @@ - #include <linux/init.h> - #include <linux/delay.h> - #include <linux/device.h> -+#include <linux/gpio.h> -+#include <linux/gpio/consumer.h> - #include <linux/of_device.h> - #include <linux/of_mdio.h> -+#include <linux/of_gpio.h> - #include <linux/netdevice.h> - #include <linux/etherdevice.h> - #include <linux/skbuff.h> -@@ -252,6 +255,7 @@ static inline void of_mdiobus_link_phyde - int __mdiobus_register(struct mii_bus *bus, struct module *owner) - { - int i, err; -+ struct gpio_desc *gpiod; - - if (NULL == bus || NULL == bus->name || - NULL == bus->read || NULL == bus->write) -@@ -278,6 +282,35 @@ int __mdiobus_register(struct mii_bus *b - if (bus->reset) - bus->reset(bus); - -+ /* de-assert bus level PHY GPIO resets */ -+ if (bus->num_reset_gpios > 0) { -+ bus->reset_gpiod = devm_kcalloc(&bus->dev, -+ bus->num_reset_gpios, -+ sizeof(struct gpio_desc *), -+ GFP_KERNEL); -+ if (!bus->reset_gpiod) -+ return -ENOMEM; -+ } -+ -+ for (i = 0; i < bus->num_reset_gpios; i++) { -+ gpiod = devm_gpiod_get_index(&bus->dev, "reset", i, -+ GPIOD_OUT_LOW); -+ if (IS_ERR(gpiod)) { -+ err = PTR_ERR(gpiod); -+ if (err != -ENOENT) { -+ dev_err(&bus->dev, -+ "mii_bus %s couldn't get reset GPIO\n", -+ bus->id); -+ return err; -+ } -+ } else { -+ bus->reset_gpiod[i] = gpiod; -+ gpiod_set_value_cansleep(gpiod, 1); -+ udelay(bus->reset_delay_us); -+ gpiod_set_value_cansleep(gpiod, 0); -+ } -+ } -+ - for (i = 0; i < PHY_MAX_ADDR; i++) { - if ((bus->phy_mask & (1 << i)) == 0) { - struct phy_device *phydev; -@@ -302,6 +335,13 @@ error: - phy_device_free(phydev); - } - } -+ -+ /* Put PHYs in RESET to save power */ -+ for (i = 0; i < bus->num_reset_gpios; i++) { -+ if (bus->reset_gpiod[i]) -+ gpiod_set_value_cansleep(bus->reset_gpiod[i], 1); -+ } -+ - device_del(&bus->dev); - return err; - } -@@ -321,6 +361,13 @@ void mdiobus_unregister(struct mii_bus * - phy_device_free(phydev); - } - } -+ -+ /* Put PHYs in RESET to save power */ -+ for (i = 0; i < bus->num_reset_gpios; i++) { -+ if (bus->reset_gpiod[i]) -+ gpiod_set_value_cansleep(bus->reset_gpiod[i], 1); -+ } -+ - device_del(&bus->dev); - } - EXPORT_SYMBOL(mdiobus_unregister); ---- a/drivers/of/of_mdio.c -+++ b/drivers/of/of_mdio.c -@@ -21,6 +21,8 @@ - #include <linux/of_mdio.h> - #include <linux/module.h> - -+#define DEFAULT_GPIO_RESET_DELAY 10 /* in microseconds */ -+ - MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); - MODULE_LICENSE("GPL"); - -@@ -140,6 +142,11 @@ int of_mdiobus_register(struct mii_bus * - - mdio->dev.of_node = np; - -+ /* Get bus level PHY reset GPIO details */ -+ mdio->reset_delay_us = DEFAULT_GPIO_RESET_DELAY; -+ of_property_read_u32(np, "reset-delay-us", &mdio->reset_delay_us); -+ mdio->num_reset_gpios = of_gpio_named_count(np, "reset-gpios"); -+ - /* Register the MDIO bus */ - rc = mdiobus_register(mdio); - if (rc) ---- a/include/linux/phy.h -+++ b/include/linux/phy.h -@@ -187,6 +187,13 @@ struct mii_bus { - * interrupt at the index matching its address - */ - int *irq; -+ -+ /* GPIO reset pulse width in microseconds */ -+ int reset_delay_us; -+ /* Number of reset GPIOs */ -+ int num_reset_gpios; -+ /* Array of RESET GPIO descriptors */ -+ struct gpio_desc **reset_gpiod; - }; - #define to_mii_bus(d) container_of(d, struct mii_bus, dev) - |