[PATCH 08/16] phy: rcar-gen3-usb2: Add vbus-supply to handle VBUS on/off

From: Kishon Vijay Abraham I
Date: Mon May 02 2016 - 00:23:49 EST


From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>

To handle the VBUS on/off by a regulator driver, this patch adds
regulator APIs calling in the driver and description about vbus-supply
in the rcar-gen3-phy-usb2.txt.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
---
.../devicetree/bindings/phy/rcar-gen3-phy-usb2.txt | 2 ++
drivers/phy/phy-rcar-gen3-usb2.c | 28 ++++++++++++++++++++
2 files changed, 30 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
index f9511ad..2281d6c 100644
--- a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
+++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
@@ -21,6 +21,8 @@ To use a USB channel where USB 2.0 Host and HSUSB (USB 2.0 Peripheral) are
combined, the device tree node should set interrupt properties to use the
channel as USB OTG:
- interrupts: interrupt specifier for the PHY.
+- vbus-supply: Phandle to a regulator that provides power to the VBUS. This
+ regulator will be managed during the PHY power on/off sequence.

Example (R-Car H3):

diff --git a/drivers/phy/phy-rcar-gen3-usb2.c b/drivers/phy/phy-rcar-gen3-usb2.c
index 3c647cd..7b14244 100644
--- a/drivers/phy/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/phy-rcar-gen3-usb2.c
@@ -19,6 +19,7 @@
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>

/******* USB2.0 Host registers (original offset is +0x200) *******/
#define USB2_INT_ENABLE 0x000
@@ -77,6 +78,7 @@
struct rcar_gen3_chan {
void __iomem *base;
struct phy *phy;
+ struct regulator *vbus;
bool has_otg;
};

@@ -210,6 +212,13 @@ static int rcar_gen3_phy_usb2_power_on(struct phy *p)
struct rcar_gen3_chan *channel = phy_get_drvdata(p);
void __iomem *usb2_base = channel->base;
u32 val;
+ int ret;
+
+ if (channel->vbus) {
+ ret = regulator_enable(channel->vbus);
+ if (ret)
+ return ret;
+ }

val = readl(usb2_base + USB2_USBCTR);
val |= USB2_USBCTR_PLL_RST;
@@ -220,10 +229,22 @@ static int rcar_gen3_phy_usb2_power_on(struct phy *p)
return 0;
}

+static int rcar_gen3_phy_usb2_power_off(struct phy *p)
+{
+ struct rcar_gen3_chan *channel = phy_get_drvdata(p);
+ int ret = 0;
+
+ if (channel->vbus)
+ ret = regulator_disable(channel->vbus);
+
+ return ret;
+}
+
static struct phy_ops rcar_gen3_phy_usb2_ops = {
.init = rcar_gen3_phy_usb2_init,
.exit = rcar_gen3_phy_usb2_exit,
.power_on = rcar_gen3_phy_usb2_power_on,
+ .power_off = rcar_gen3_phy_usb2_power_off,
.owner = THIS_MODULE,
};

@@ -290,6 +311,13 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
return PTR_ERR(channel->phy);
}

+ channel->vbus = devm_regulator_get_optional(dev, "vbus");
+ if (IS_ERR(channel->vbus)) {
+ if (PTR_ERR(channel->vbus) == -EPROBE_DEFER)
+ return PTR_ERR(channel->vbus);
+ channel->vbus = NULL;
+ }
+
phy_set_drvdata(channel->phy, channel);

provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
--
1.7.9.5