linux-kernel - [PATCH 1/2] arm64: dts: rockchip: fix inverted headphone detection

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Date:   Tue, 14 Apr 2020 18:39:51 +0200
From:   Tobias Schramm <t.schramm@...jaro.org>
To:     Rob Herring <robh+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>
Cc:     devicetree@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Tobias Schramm <t.schramm@...jaro.org>
Subject: [PATCH 1/2] arm64: dts: rockchip: fix inverted headphone detection

On the Pinebook Pro the headphone jack is dual use. It can be used either
as a normal headphone jack or as a debug serial connection. This
functionality is controlled via a small hardware switch on the mainboard.
Unfortunately flipping this switch biases the headphone detection switch
inside the headphone jack at 3.3 V if in `debug UART` position but
to GND when in `headphone out` position.
This results in an inversion of the headphone detection logic depending
on the switch position.
Since the headphone jack can only be used for audio when in
`headphone out` position this commit changes the headphone detect GPIO
logic to be correct for that case rather than for the debug UART.

Signed-off-by: Tobias Schramm <t.schramm@...jaro.org>
---
 arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts
index 5ea281b55fe2..c3f15f5bd550 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts
@@ -147,7 +147,7 @@ es8316-sound {
 			"Speaker", "Speaker Amplifier OUTL",
 			"Speaker", "Speaker Amplifier OUTR";

-		simple-audio-card,hp-det-gpio = <&gpio0 RK_PB0 GPIO_ACTIVE_LOW>;
+		simple-audio-card,hp-det-gpio = <&gpio0 RK_PB0 GPIO_ACTIVE_HIGH>;
 		simple-audio-card,aux-devs = <&speaker_amp>;
 		simple-audio-card,pin-switches = "Speaker";

@@ -794,7 +794,7 @@ dc_det_gpio: dc-det-gpio {

 	es8316 {
 		hp_det_gpio: hp-det-gpio {
-			rockchip,pins = <0 RK_PB0 RK_FUNC_GPIO &pcfg_pull_down>;
+			rockchip,pins = <0 RK_PB0 RK_FUNC_GPIO &pcfg_pull_up>;
 		};
 	};

-- 
2.26.0