linux-kernel - [PATCH 1/2] arm64: dts: rockchip: enable internal pull-up for Q7

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Date: Fri,  8 Mar 2024 09:52:42 +0100
From: Iskander Amara <iskander.amara@...obroma-systems.com>
To: robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org,
	heiko@...ech.de,
	vahe.grigoryan@...obroma-systems.com,
	angelogioacchino.delregno@...labora.com,
	dsimic@...jaro.org,
	alexander.stein@...tq-group.com,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: quentin.schulz@...obroma-systems.com,
	Iskander Amara <iskander.amara@...obroma-systems.com>
Subject: [PATCH 1/2] arm64: dts: rockchip: enable internal pull-up for Q7_THRM# on RK3399 Puma

Q7_THRM# pin is connected to a diode on the module which is used
as a level shifter, and the pin have a pull-down enabled by
default. We need to configure it to internal pull-up, other-
wise whenever the pin is configured as INPUT and we try to
control it externally the value will always remain zero.

Signed-off-by: Iskander Amara <iskander.amara@...obroma-systems.com>
---
 arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
index c08e69391c01..06f3e97af7cd 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
@@ -426,6 +426,16 @@ &pwm2 {
 };
 
 &pinctrl {
+	pinctrl-names = "default";
+	pinctrl-0 = <&q7_thermal_pin>;
+
+	gpios {
+		q7_thermal_pin: q7-thermal-pin {
+			rockchip,pins =
+				<0 RK_PA3 RK_FUNC_GPIO &pcfg_pull_up>;
+		};
+	};
+
 	i2c8 {
 		i2c8_xfer_a: i2c8-xfer {
 			rockchip,pins =
-- 
2.34.1