ARM: shmobile: lager: Specify external clock frequency in DT

The external crystal frequency is 20MHz on the Lager board. Specify it
in the device tree.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/r8a7790-lager.dts b/arch/arm/boot/dts/r8a7790-lager.dts
index 67a69399ba19..57569cba1528 100644
--- a/arch/arm/boot/dts/r8a7790-lager.dts
+++ b/arch/arm/boot/dts/r8a7790-lager.dts
@@ -58,6 +58,10 @@
         };
 };
 
+&extal_clk {
+        clock-frequency = <20000000>;
+};
+
 &pfc {
         pinctrl-0 = <&scif0_pins &scif1_pins>;
         pinctrl-names = "default";