[PATCH] arm64: dts: renesas: ulcb-kf: document a problemw with old firmware

[Wolfram Sang]

Old firmware set the GPIO to output, so no interrupts could be read.
Newer firmware does this correctly. The exact version could not be
determined, sadly.

Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
 arch/arm64/boot/dts/renesas/ulcb-kf.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/renesas/ulcb-kf.dtsi b/arch/arm64/boot/dts/renesas/ulcb-kf.dtsi
index 84b0976503b7..45e55ce760d1 100644
--- a/arch/arm64/boot/dts/renesas/ulcb-kf.dtsi
+++ b/arch/arm64/boot/dts/renesas/ulcb-kf.dtsi
@@ -324,6 +324,7 @@ gpio_exp_77: gpio@77 {
 		reg = <0x77>;
 		gpio-controller;
 		#gpio-cells = <2>;
+		/* If these interrupts don't work, please update your firmware */
 		interrupt-controller;
 		interrupt-parent = <&gpio5>;
 		interrupts = <9 IRQ_TYPE_EDGE_FALLING>;
-- 
2.39.2