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Subject[PATCH 31/32] phy: rockchip-usb: Add vbus regulator support.
Date
From: Sjoerd Simons <sjoerd.simons@collabora.co.uk>

On rockchip devices vbus is supplied by a separate power supply, often
through a regulator. Add support for describing the the regulator in
device-tree following the same convention as several other usb phy's.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
.../devicetree/bindings/phy/rockchip-usb-phy.txt | 1 +
drivers/phy/phy-rockchip-usb.c | 19 +++++++++++++++++++
2 files changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/rockchip-usb-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-usb-phy.txt
index 57dc388e2fa2..4ed569046daf 100644
--- a/Documentation/devicetree/bindings/phy/rockchip-usb-phy.txt
+++ b/Documentation/devicetree/bindings/phy/rockchip-usb-phy.txt
@@ -30,6 +30,7 @@ Optional Properties:
- reset-names: Only allow the following entries:
- phy-reset
- resets: Must contain an entry for each entry in reset-names.
+- vbus-supply: power-supply phandle for vbus power source

Example:

diff --git a/drivers/phy/phy-rockchip-usb.c b/drivers/phy/phy-rockchip-usb.c
index 734987fa0ad7..3378eeb7a562 100644
--- a/drivers/phy/phy-rockchip-usb.c
+++ b/drivers/phy/phy-rockchip-usb.c
@@ -66,6 +66,7 @@ struct rockchip_usb_phy {
struct phy *phy;
bool uart_enabled;
struct reset_control *reset;
+ struct regulator *vbus;
};

static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy,
@@ -88,6 +89,9 @@ static void rockchip_usb_phy480m_disable(struct clk_hw *hw)
struct rockchip_usb_phy,
clk480m_hw);

+ if (phy->vbus)
+ regulator_disable(phy->vbus);
+
/* Power down usb phy analog blocks by set siddq 1 */
rockchip_usb_phy_power(phy, 1);
}
@@ -143,6 +147,14 @@ static int rockchip_usb_phy_power_on(struct phy *_phy)
if (phy->uart_enabled)
return -EBUSY;

+ if (phy->vbus) {
+ int ret;
+
+ ret = regulator_enable(phy->vbus);
+ if (ret)
+ return ret;
+ }
+
return clk_prepare_enable(phy->clk480m);
}

@@ -268,6 +280,13 @@ static int rockchip_usb_phy_init(struct rockchip_usb_phy_base *base,
}
phy_set_drvdata(rk_phy->phy, rk_phy);

+ rk_phy->vbus = devm_regulator_get_optional(&rk_phy->phy->dev, "vbus");
+ if (IS_ERR(rk_phy->vbus)) {
+ if (PTR_ERR(rk_phy->vbus) == -EPROBE_DEFER)
+ return PTR_ERR(rk_phy->vbus);
+ rk_phy->vbus = NULL;
+ }
+
/*
* When acting as uart-pipe, just keep clock on otherwise
* only power up usb phy when it use, so disable it when init
--
2.11.0
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