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Commit 4fc8a4e6 authored by Vivek Gautam's avatar Vivek Gautam Committed by Kishon Vijay Abraham I
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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: default avatarVivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
parent 59025887

drivers/phy/phy-exynos5-usbdrd.c

+32 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/mfd/syscon.h>

#include <linux/mfd/syscon/exynos5-pmu.h>

#include <linux/regmap.h>

#include <linux/regulator/consumer.h>



/* Exynos USB PHY registers */

#define EXYNOS5_FSEL_9MHZ6		0x0
@@ -170,6 +171,7 @@ struct exynos5_usbdrd_phy { 
	} phys[EXYNOS5_DRDPHYS_NUM];

	u32 extrefclk;

	struct clk *ref_clk;

	struct regulator *vbus;

};



static inline
@@ -438,6 +440,7 @@ 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);
@@ -445,10 +448,24 @@ 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);



	return ret;

}



static int exynos5_usbdrd_phy_power_off(struct phy *phy)
@@ -461,6 +478,10 @@ 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;
@@ -600,6 +621,17 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev) 
		break;

	}



	/* Get Vbus regulator */

	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;

	}



	dev_vdbg(dev, "Creating usbdrd_phy phy\n");



	for (i = 0; i < EXYNOS5_DRDPHYS_NUM; i++) {