usb: dwc2: make otg clk optional

Fixes commit 09a75e857790
("usb: dwc2: refactor common low-level hw code to platform.c")

The above commit consolidated the low-level phy access into a common
location. This change made the otg clk a requirement and broke some
platforms when it was moved into platform.c.

So make clk handling optional again.

Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: John Youn <johnyoun@synopsys.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Fixes: 09a75e857790 ("usb: dwc2: refactor common low-level hw code to platform.c")
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index d28f72e87389..91e2e6b86c7c 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -125,9 +125,11 @@ static int __dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
         if (ret)
                 return ret;
 
-        ret = clk_prepare_enable(hsotg->clk);
-        if (ret)
-                return ret;
+        if (hsotg->clk) {
+                ret = clk_prepare_enable(hsotg->clk);
+                if (ret)
+                        return ret;
+        }
 
         if (hsotg->uphy)
                 ret = usb_phy_init(hsotg->uphy);
@@ -175,7 +177,8 @@ static int __dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg)
         if (ret)
                 return ret;
 
-        clk_disable_unprepare(hsotg->clk);
+        if (hsotg->clk)
+                clk_disable_unprepare(hsotg->clk);
 
         ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
                                      hsotg->supplies);