[PATCH 4/4] usb: phy: omap-usb2: enable 960Mhz clock for omap5

[Kishon Vijay Abraham I]

"usb_otg_ss_refclk960m" is needed by usb2 phy present in omap5. For
omap4, the clk_get of this clock will fail since it does not have this
clock.

Signed-off-by: Kishon Vijay Abraham I <kis...@ti.com>
---
 Documentation/devicetree/bindings/usb/usb-phy.txt |    3 +++
 drivers/usb/phy/omap-usb2.c                       |   28 ++++++++++++++++++++-
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/usb-phy.txt 
b/Documentation/devicetree/bindings/usb/usb-phy.txt
index 7c5fd89..d5626de 100644
--- a/Documentation/devicetree/bindings/usb/usb-phy.txt
+++ b/Documentation/devicetree/bindings/usb/usb-phy.txt
@@ -24,6 +24,9 @@ Required properties:
 add the address of control module phy power register until a driver for
 control module is added
 
+Optional properties:
+ - has960mhzclk: should be added if the phy needs 960mhz clock
+
 This is usually a subnode of ocp2scp to which it is connected.
 
 usb3phy@4a084400 {
diff --git a/drivers/usb/phy/omap-usb2.c b/drivers/usb/phy/omap-usb2.c
index d36c282..d6612ba 100644
--- a/drivers/usb/phy/omap-usb2.c
+++ b/drivers/usb/phy/omap-usb2.c
@@ -146,6 +146,7 @@ static int __devinit omap_usb2_probe(struct platform_device 
*pdev)
        struct omap_usb                 *phy;
        struct usb_otg                  *otg;
        struct resource                 *res;
+       struct device_node              *np = pdev->dev.of_node;
 
        phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
        if (!phy) {
@@ -190,6 +191,15 @@ static int __devinit omap_usb2_probe(struct 
platform_device *pdev)
        }
        clk_prepare(phy->wkupclk);
 
+       if (of_property_read_bool(np, "has960mhzclk")) {
+               phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
+               if (IS_ERR(phy->optclk)) {
+                       dev_err(&pdev->dev, "unable to get refclk960m\n");
+                       return PTR_ERR(phy->optclk);
+               }
+               clk_prepare(phy->optclk);
+       }
+
        usb_add_phy(&phy->phy, USB_PHY_TYPE_USB2);
 
        platform_set_drvdata(pdev, phy);
@@ -204,6 +214,7 @@ static int __devexit omap_usb2_remove(struct 
platform_device *pdev)
        struct omap_usb *phy = platform_get_drvdata(pdev);
 
        clk_unprepare(phy->wkupclk);
+       clk_unprepare(phy->optclk);
        usb_remove_phy(&phy->phy);
 
        return 0;
@@ -217,6 +228,7 @@ static int omap_usb2_runtime_suspend(struct device *dev)
        struct omap_usb *phy = platform_get_drvdata(pdev);
 
        clk_disable(phy->wkupclk);
+       clk_disable(phy->optclk);
 
        return 0;
 }
@@ -228,8 +240,22 @@ static int omap_usb2_runtime_resume(struct device *dev)
        struct omap_usb *phy = platform_get_drvdata(pdev);
 
        ret = clk_enable(phy->wkupclk);
-       if (ret < 0)
+       if (ret < 0) {
                dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
+               return ret;
+       }
+
+       if (phy->optclk) {
+               ret = clk_enable(phy->optclk);
+               if (ret) {
+                       dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
+                       goto err;
+               }
+       }
+
+       return 0;
+err:
+       clk_disable(phy->wkupclk);
 
        return ret;
 }
-- 
1.7.9.5

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