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usb: tegra: Use regulators instead of GPIOs for USB PHY VBUS

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The tegra ehci driver has enabled USB vbus regulators directly using
GPIOs and the device tree attribute nvidia,vbus-gpio. This is ugly
and causes error messages on boot when both the regulator driver
and the ehci driver want access to the same GPIO.

After this patch, usb vbus regulators for tegra usb phy devices are specified
with the device tree attribute vbus-supply = <&x> where x is a regulator defined
in the device tree. The old nvidia,vbus-gpio property is no longer supported.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Mikko Perttunen 2013-07-17 10:37:49 +03:00 committed by Felipe Balbi
parent 81d5dfe6d8
commit f5b8c8b6d3
3 changed files with 26 additions and 33 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

34
drivers/usb/host/ehci-tegra.c
View file

@ -322,33 +322,6 @@ static void tegra_ehci_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
free_dma_aligned_buffer(urb);
}
static int setup_vbus_gpio(struct platform_device *pdev,
struct tegra_ehci_platform_data *pdata)
{
int err = 0;
int gpio;
gpio = pdata->vbus_gpio;
if (!gpio_is_valid(gpio))
gpio = of_get_named_gpio(pdev->dev.of_node,
"nvidia,vbus-gpio", 0);
if (!gpio_is_valid(gpio))
return 0;
err = gpio_request(gpio, "vbus_gpio");
if (err) {
dev_err(&pdev->dev, "can't request vbus gpio %d", gpio);
return err;
}
err = gpio_direction_output(gpio, 1);
if (err) {
dev_err(&pdev->dev, "can't enable vbus\n");
return err;
}
return err;
}
static int tegra_ehci_probe(struct platform_device *pdev)
{
struct resource *res;
@ -376,14 +349,11 @@ static int tegra_ehci_probe(struct platform_device *pdev)
if (!pdev->dev.coherent_dma_mask)
pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
setup_vbus_gpio(pdev, pdata);
hcd = usb_create_hcd(&tegra_ehci_hc_driver, &pdev->dev,
dev_name(&pdev->dev));
if (!hcd) {
dev_err(&pdev->dev, "Unable to create HCD\n");
err = -ENOMEM;
goto cleanup_vbus_gpio;
return -ENOMEM;
}
platform_set_drvdata(pdev, hcd);
ehci = hcd_to_ehci(hcd);
@ -494,8 +464,6 @@ static int tegra_ehci_probe(struct platform_device *pdev)
clk_put(tegra->clk);
cleanup_hcd_create:
usb_put_hcd(hcd);
cleanup_vbus_gpio:
/* FIXME: Undo setup_vbus_gpio() here */
return err;
}

24
drivers/usb/phy/phy-tegra-usb.c
View file

@ -34,6 +34,7 @@
#include <asm/mach-types.h>
#include <linux/usb/ehci_def.h>
#include <linux/usb/tegra_usb_phy.h>
#include <linux/regulator/consumer.h>
#define ULPI_VIEWPORT 0x170
@ -613,6 +614,9 @@ static void tegra_usb_phy_close(struct usb_phy *x)
{
struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
if (!IS_ERR(phy->vbus))
regulator_disable(phy->vbus);
clk_disable_unprepare(phy->pll_u);
}
@ -705,6 +709,16 @@ static int tegra_usb_phy_init(struct tegra_usb_phy *phy)
goto fail;
}
if (!IS_ERR(phy->vbus)) {
err = regulator_enable(phy->vbus);
if (err) {
dev_err(phy->dev,
"failed to enable usb vbus regulator: %d\n",
err);
goto fail;
}
}
if (phy->is_ulpi_phy)
err = ulpi_open(phy);
else
@ -896,6 +910,16 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
} else
tegra_phy->mode = TEGRA_USB_PHY_MODE_OTG;
/* On some boards, the VBUS regulator doesn't need to be controlled */
if (of_find_property(np, "vbus-supply", NULL)) {
tegra_phy->vbus = devm_regulator_get(&pdev->dev, "vbus");
if (IS_ERR(tegra_phy->vbus))
return PTR_ERR(tegra_phy->vbus);
} else {
dev_notice(&pdev->dev, "no vbus regulator");
tegra_phy->vbus = ERR_PTR(-ENODEV);
}
tegra_phy->dev = &pdev->dev;
err = tegra_usb_phy_init(tegra_phy);
if (err < 0)

1
include/linux/usb/tegra_usb_phy.h
View file

@ -55,6 +55,7 @@ struct tegra_usb_phy {
struct clk *clk;
struct clk *pll_u;
struct clk *pad_clk;
struct regulator *vbus;
enum tegra_usb_phy_mode mode;
void *config;
struct usb_phy *ulpi;