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Message-Id: <1398153795-28475-3-git-send-email-gautam.vivek@samsung.com>
Date: Tue, 22 Apr 2014 13:33:15 +0530
From: Vivek Gautam <gautam.vivek@...sung.com>
To: linux-usb@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
kishon@...com
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
gregkh@...uxfoundation.org, balbi@...com, kgene.kim@...sung.com,
t.figa@...sung.com, k.debski@...sung.com,
sylvester.nawrocki@...il.com
Subject: [PATCH v5 2/2] phy: exynos5-usbdrd: Add facility for VBUS supply
Adding support to enable/disable VBUS controlled by a
regulator, to enable vbus supply on the port.
Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
---
This is v2 version of patch:
[PATCH] phy: exynos5-usbdrd: Add facility to toggle vbus gpio on/off
https://lkml.org/lkml/2014/4/9/186
Changes from v1:
- Using regulator APIs instead of gpio to control VBUS.
drivers/phy/phy-exynos5-usbdrd.c | 36 +++++++++++++++++++++++++++++++++++-
1 file changed, 35 insertions(+), 1 deletion(-)
diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
index 89d7ae8..d7e3745 100644
--- a/drivers/phy/phy-exynos5-usbdrd.c
+++ b/drivers/phy/phy-exynos5-usbdrd.c
@@ -23,6 +23,7 @@
#include <linux/mutex.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
/* Exynos USB PHY registers */
#define EXYNOS5_FSEL_9MHZ6 0x0
@@ -172,6 +173,7 @@ struct exynos5_usbdrd_phy {
unsigned int extrefclk;
struct clk *ref_clk;
unsigned long ref_rate;
+ struct regulator *vbus;
};
#define to_usbdrd_phy(inst) \
@@ -442,6 +444,7 @@ static int exynos5_usbdrd_phy_exit(struct phy *phy)
static int exynos5_usbdrd_phy_power_on(struct phy *phy)
{
+ int ret;
struct phy_usb_instance *inst = phy_get_drvdata(phy);
struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
@@ -449,10 +452,26 @@ static int exynos5_usbdrd_phy_power_on(struct phy *phy)
clk_prepare_enable(phy_drd->ref_clk);
+ /* Enable VBUS supply */
+ if (phy_drd->vbus) {
+ ret = regulator_enable(phy_drd->vbus);
+ if (ret) {
+ dev_err(phy_drd->dev, "Failed to enable VBUS supply\n");
+ goto fail_vbus;
+ }
+ }
+
/* Power-on PHY*/
inst->phy_cfg->phy_isol(inst, 0);
return 0;
+
+fail_vbus:
+ clk_disable_unprepare(phy_drd->ref_clk);
+ if (!IS_ERR(phy_drd->usb30_sclk))
+ clk_disable_unprepare(phy_drd->usb30_sclk);
+
+ return ret;
}
static int exynos5_usbdrd_phy_power_off(struct phy *phy)
@@ -465,6 +484,10 @@ static int exynos5_usbdrd_phy_power_off(struct phy *phy)
/* Power-off the PHY */
inst->phy_cfg->phy_isol(inst, 1);
+ /* Disable VBUS supply */
+ if (phy_drd->vbus)
+ regulator_disable(phy_drd->vbus);
+
clk_disable_unprepare(phy_drd->ref_clk);
return 0;
@@ -537,7 +560,7 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
const struct exynos5_usbdrd_phy_drvdata *drv_data;
struct regmap *reg_pmu;
u32 pmu_offset;
- int i;
+ int i, ret;
phy_drd = devm_kzalloc(dev, sizeof(*phy_drd), GFP_KERNEL);
if (!phy_drd)
@@ -580,6 +603,17 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
return PTR_ERR(reg_pmu);
}
+ /* Get required GPIO for vbus */
+ phy_drd->vbus = devm_regulator_get(dev, "vbus");
+ if (IS_ERR(phy_drd->vbus)) {
+ ret = PTR_ERR(phy_drd->vbus);
+ if (ret == -EPROBE_DEFER)
+ return ret;
+
+ dev_warn(dev, "Failed to get VBUS supply regulator\n");
+ phy_drd->vbus = NULL;
+ }
+
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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