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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
@@ -191,6 +191,13 @@ 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)
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