arm64: zynqmp: Assign TSU clock frequency for KR260

Set TSU clock frequency as 250MHz (minimum when running at 1G) on
KR260 CC to allow PTP functionality.

Signed-off-by: Harini Katakam <harini.katakam@amd.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/d065b5c2c6450910bf57d104d65946111493caaa.1688992653.git.michal.simek@amd.com
diff --git a/arch/arm/dts/zynqmp-sck-kr-g-revB.dts b/arch/arm/dts/zynqmp-sck-kr-g-revB.dts
index 401de9e..f9d8755 100644
--- a/arch/arm/dts/zynqmp-sck-kr-g-revB.dts
+++ b/arch/arm/dts/zynqmp-sck-kr-g-revB.dts
@@ -188,6 +188,7 @@
 	phy-handle = <&phy0>;
 	phy-mode = "sgmii";
 	is-internal-pcspma;
+	assigned-clock-rates = <250000000>;
 };
 
 &gem1 { /* mdio mio50/51, gem mio38 - mio49 */
@@ -196,6 +197,7 @@
 	pinctrl-0 = <&pinctrl_gem1_default>;
 	phy-handle = <&phy1>;
 	phy-mode = "rgmii-id";
+	assigned-clock-rates = <250000000>;
 
 	mdio: mdio {
 		#address-cells = <1>;