Add USB clock node. If present, this clock input must be 48MHz.

Signed-off-by: Chris Brandt <chris.bra...@renesas.com>
Reviewed-by: Simon Horman <horms+rene...@verge.net.au>
---
v2:
 * added reviewed-by
---
 arch/arm/boot/dts/r7s9210.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/r7s9210.dtsi b/arch/arm/boot/dts/r7s9210.dtsi
index 2eaa5eeba509..73041f04fef5 100644
--- a/arch/arm/boot/dts/r7s9210.dtsi
+++ b/arch/arm/boot/dts/r7s9210.dtsi
@@ -30,6 +30,13 @@
                clock-frequency = <0>;
        };
 
+       usb_x1_clk: usb_x1 {
+               #clock-cells = <0>;
+               compatible = "fixed-clock";
+               /* If clk present, value (48000000) must be set by board */
+               clock-frequency = <0>;
+       };
+
        cpus {
                #address-cells = <1>;
                #size-cells = <0>;
-- 
2.16.1

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