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

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Message-Id: <20240130095222.11177-1-wsa+renesas@sang-engineering.com>
Date: Tue, 30 Jan 2024 10:52:22 +0100
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: linux-renesas-soc@...r.kernel.org
Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: renesas: ulcb-kf: document a problemw with old firmware

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@...g-engineering.com>
---
 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