[PATCH v5 2/3] dt-bindings: usb: renesas_usbhs: add clock-names property

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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.uh@xxxxxxxxxxx>
---
 Documentation/devicetree/bindings/usb/renesas_usbhs.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
index 087140a..15fb3b3 100644
--- a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
+++ b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
@@ -26,7 +26,11 @@ Required properties:
 
   - reg: Base address and length of the register for the USBHS
   - interrupts: Interrupt specifier for the USBHS
-  - clocks: A list of phandle + clock specifier pairs
+  - clocks: A list of phandle + clock specifier pairs.
+	    - In case of "renesas,rcar-gen3-usbhs", two clocks are required.
+	      First clock should be peripheral and second one should be host.
+	    - In case of except above, one clock is required. First clock
+	      should be peripheral.
 
 Optional properties:
   - renesas,buswait: Integer to use BUSWAIT register
-- 
1.9.1




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