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phy: rcar-gen3-usb2: Add vbus-supply to handle VBUS on/off

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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@renesas.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Yoshihiro Shimoda 2016-03-03 19:09:05 +09:00 committed by Kishon Vijay Abraham I
parent 801a69c787
commit 6dcfd7c300
2 changed files with 30 additions and 0 deletions
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2
Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
View File

@ -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):

28
drivers/phy/phy-rcar-gen3-usb2.c
View File

@ -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);