R-Car Gen3 needs to enable clocks of both host and peripheral.
Otherwise, other side device cannot work correctly. So, this patch
adds a property of clock-names for R-Car Gen3 as an optional.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
---
 Documentation/devicetree/bindings/usb/renesas_usbhs.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt 
b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
index 087140a..a8fa3ec 100644
--- a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
+++ b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
@@ -37,6 +37,8 @@ Optional properties:
   - dmas: Must contain a list of references to DMA specifiers.
   - dma-names : named "ch%d", where %d is the channel number ranging from zero
                 to the number of channels (DnFIFOs) minus one.
+  - clock-names: For a "renesas,rcar-gen3-usbhs" compatible device,
+                "hsusb" and "ehci/ohci" can be set.
 
 Example:
        usbhs: usb@e6590000 {
-- 
1.9.1

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