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From: Wolfram Sang <wsa+renesas@sang-engineering.com>
To: linux-renesas-soc@vger.kernel.org
Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Magnus Damm <magnus.damm@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] arm64: dts: renesas: ulcb-kf: document a problemw with old firmware
Date: Tue, 30 Jan 2024 10:52:22 +0100
Message-Id: <20240130095222.11177-1-wsa+renesas@sang-engineering.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

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@sang-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