From: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
When using external USB PHY or USB hub, it is common that they require a clock
input.
Add a 'clk_phy' clock, so that it can be retrieved from the device tree and
enabled in the driver, so that the clock can properly drive the external
USB phy/hub.
Tested on a imx6q-udoo board, that connects via USBH1 to a USB2514 hub.
In this board the USB2514 is clocked from a 24MHz clock that comes from the
imx6q CLKO2 pin.
Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
---
.../devicetree/bindings/usb/ci13xxx-imx.txt | 2 ++
drivers/usb/chipidea/ci_hdrc_imx.c | 20 +++++++++++++++++++-
2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt b/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
index b4b5b79..07ba38c 100644
--- a/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
+++ b/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
@@ -18,6 +18,8 @@ Optional properties:
- vbus-supply: regulator for vbus
- disable-over-current: disable over current detect
- external-vbus-divider: enables off-chip resistor divider for Vbus
+- clocks: phandle to the clock that drives the USB hub
+- clock-names: must be "phy"
Examples:
usb@02184000 { /* USB OTG */
diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index bb5d976..a197748 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -27,6 +27,7 @@ struct ci_hdrc_imx_data {
struct usb_phy *phy;
struct platform_device *ci_pdev;
struct clk *clk;
+ struct clk *clk_phy;
struct imx_usbmisc_data *usbmisc_data;
};
@@ -107,10 +108,22 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
return ret;
}
+ data->clk_phy = devm_clk_get(&pdev->dev, "phy");
+ if (IS_ERR(data->clk_phy)) {
+ data->clk_phy = NULL;
+ } else {
+ ret = clk_prepare_enable(data->clk_phy);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Failed to enable clk_phy: %d\n", ret);
+ goto err_clk;
+ }
+ }
+
data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0);
if (IS_ERR(data->phy)) {
ret = PTR_ERR(data->phy);
- goto err_clk;
+ goto err_clk_phy;
}
pdata.phy = data->phy;
@@ -157,6 +170,9 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
disable_device:
ci_hdrc_remove_device(data->ci_pdev);
+err_clk_phy:
+ if (data->clk_phy)
+ clk_disable_unprepare(data->clk_phy);
err_clk:
clk_disable_unprepare(data->clk);
return ret;
@@ -168,6 +184,8 @@ static int ci_hdrc_imx_remove(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
ci_hdrc_remove_device(data->ci_pdev);
+ if (data->clk_phy)
+ clk_disable_unprepare(data->clk_phy);
clk_disable_unprepare(data->clk);
return 0;
--
1.8.1.2
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