dt-bindings: usb: mtk-xhci: add an optional xhci_ck clock

Add a new optional clock xhci_ck

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1566542425-20082-1-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
index 266c2d9..f3e4ace 100644 (file)
--- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
+++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
@@ -30,7 +30,8 @@ Required properties:
        the following ones are optional:
        "ref_ck": reference clock used by low power mode etc,
        "mcu_ck": mcu_bus clock for register access,
-       "dma_ck": dma_bus clock for data transfer by DMA
+       "dma_ck": dma_bus clock for data transfer by DMA,
+       "xhci_ck": controller clock
 
  - phys : see usb-hcd.txt in the current directory
 
@@ -100,7 +101,7 @@ Required properties:
  - clocks : a list of phandle + clock-specifier pairs, one for each
        entry in clock-names
  - clock-names : must contain "sys_ck", and the following ones are optional:
-       "ref_ck", "mcu_ck" and "dma_ck"
+       "ref_ck", "mcu_ck" and "dma_ck", "xhci_ck"
 
 Optional properties:
  - vbus-supply : reference to the VBUS regulator;