From da47b4572056487fd7941c26f73b3e8815ff712a Mon Sep 17 00:00:00 2001
From: =?utf8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>
Date: Thu, 12 May 2016 12:00:33 +0200
Subject: [PATCH] phy: add support for a reset-gpio specification
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The framework only asserts (for now) that the reset gpio is not active.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
Documentation/devicetree/bindings/net/phy.txt | 3 +++
drivers/net/phy/phy_device.c | 8 ++++++++
2 files changed, 11 insertions(+)
diff --git a/Documentation/devicetree/bindings/net/phy.txt b/Documentation/devicetree/bindings/net/phy.txt
index bc1c3c8bf8fa3..c00a9a8945478 100644
--- a/Documentation/devicetree/bindings/net/phy.txt
+++ b/Documentation/devicetree/bindings/net/phy.txt
@@ -35,6 +35,8 @@ Optional Properties:
- broken-turn-around: If set, indicates the PHY device does not correctly
release the turn around line low at the end of a MDIO transaction.
+- reset-gpios: Reference to a GPIO used to reset the phy.
+
Example:
ethernet-phy@0 {
@@ -42,4 +44,5 @@ ethernet-phy@0 {
interrupt-parent = <40000>;
interrupts = <35 1>;
reg = <0>;
+ reset-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>;
};
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index e977ba931878e..307f72a0f2e2d 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -34,6 +34,7 @@
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/of.h>
+#include <linux/gpio/consumer.h>
#include <asm/irq.h>
@@ -1570,9 +1571,16 @@ static int phy_probe(struct device *dev)
struct device_driver *drv = phydev->mdio.dev.driver;
struct phy_driver *phydrv = to_phy_driver(drv);
int err = 0;
+ struct gpio_descs *reset_gpios;
phydev->drv = phydrv;
+ /* take phy out of reset */
+ reset_gpios = devm_gpiod_get_array_optional(dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(reset_gpios))
+ return PTR_ERR(reset_gpios);
+
/* Disable the interrupt if the PHY doesn't support it
* but the interrupt is still a valid one
*/
--
2.30.2