[PATCH 4/4 V2 RESEND] usb: dwc2: make otg clk optional

[Stefan Wahren]

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.

Signed-off-by: Stefan Wahren <stefan.wahren at i2se.com>
Cc: Marek Szyprowski <m.szyprowski at samsung.com>
Acked-by: John Youn <johnyoun at synopsys.com>
Tested-by: Marek Szyprowski <m.szyprowski at samsung.com>
Fixes: 09a75e857790 ("usb: dwc2: refactor common low-level hw code to platform.c")
---
 drivers/usb/dwc2/platform.c |   11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 5c3704d..947c2e8 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -124,9 +124,11 @@ 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);
@@ -174,7 +176,8 @@ 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);
-- 
1.7.9.5