[PATCH] phy: exynos5-usbdrd: Add facility to toggle vbus gpio on/off

From: Vivek Gautam
Date: Wed Apr 09 2014 - 07:55:19 EST


Adding support to enable/disable VBUS hooked to a gpio
to enable vbus supply on the port.

Signed-off-by: Vivek Gautam <gautam.vivek@xxxxxxxxxxx>
---

Based on 'phy-exynos5-usbdrd' patches:
[PATCH V4 0/5] Add Exynos5 USB 3.0 phy driver based on generic PHY framework
http://www.spinics.net/lists/linux-usb/msg105507.html

drivers/phy/phy-exynos5-usbdrd.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
index ff54a7c..5ca7485 100644
--- a/drivers/phy/phy-exynos5-usbdrd.c
+++ b/drivers/phy/phy-exynos5-usbdrd.c
@@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_gpio.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
@@ -176,6 +177,7 @@ struct exynos5_usbdrd_phy {
struct clk *ref_clk;
unsigned long ref_rate;
unsigned int refclk_reg;
+ int gpio;
};

#define to_usbdrd_phy(inst) \
@@ -460,6 +462,9 @@ static int exynos5_usbdrd_phy_power_on(struct phy *phy)
if (!IS_ERR(phy_drd->usb30_sclk))
clk_prepare_enable(phy_drd->usb30_sclk);

+ /* Toggle VBUS gpio - on */
+ gpio_set_value(phy_drd->gpio, 1);
+
/* Power-on PHY*/
inst->phy_cfg->phy_isol(inst, 0);

@@ -476,6 +481,9 @@ static int exynos5_usbdrd_phy_power_off(struct phy *phy)
/* Power-off the PHY */
inst->phy_cfg->phy_isol(inst, 1);

+ /* Toggle VBUS gpio - off */
+ gpio_set_value(phy_drd->gpio, 0);
+
if (!IS_ERR(phy_drd->usb30_sclk))
clk_disable_unprepare(phy_drd->usb30_sclk);

@@ -585,6 +593,16 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)

phy_drd->drv_data = drv_data;

+ /* Get required GPIO for vbus */
+ phy_drd->gpio = of_get_named_gpio(dev->of_node,
+ "samsung,vbus-gpio", 0);
+ if (!gpio_is_valid(phy_drd->gpio))
+ dev_dbg(dev, "no usbdrd-phy vbus gpio defined\n");
+
+ if (devm_gpio_request(dev, phy_drd->gpio, "phydrd_vbus_gpio"))
+ dev_dbg(dev, "can't request usbdrd-phy vbus gpio %d\n",
+ phy_drd->gpio);
+
if (of_property_read_u32(node, "samsung,pmu-offset", &pmu_offset)) {
dev_err(dev, "Missing pmu-offset for phy isolation\n");
return -EINVAL;
--
1.7.10.4

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