linux-kernel - [PATCH 1/4] ARM: dts: omap3-n900: fix LCD reset line polarity

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Message-Id: <20221004213503.848262-1-dmitry.torokhov@gmail.com>
Date:   Tue,  4 Oct 2022 14:35:00 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] ARM: dts: omap3-n900: fix LCD reset line polarity

The LCD driver (panel-sony-acx565akm), when probing, starts with line
driven low, and then toggles it to high and keeps it there. Also, the
line is driven low when powering off the device, and ls released when
powering it back on. This means that the reset line should be described
as "active low" in DTS. This will be important when the driver is
converted to gpiod API which respects the polarity declared in DTS.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 arch/arm/boot/dts/omap3-n900.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
index dd7971556449..c2e5bde19452 100644
--- a/arch/arm/boot/dts/omap3-n900.dts
+++ b/arch/arm/boot/dts/omap3-n900.dts
@@ -1038,7 +1038,7 @@ lcd: acx565akm@2 {
 		pinctrl-0 = <&acx565akm_pins>;
 
 		label = "lcd";
-		reset-gpios = <&gpio3 26 GPIO_ACTIVE_HIGH>; /* 90 */
+		reset-gpios = <&gpio3 26 GPIO_ACTIVE_LOW>; /* 90 */
 
 		port {
 			lcd_in: endpoint {
-- 
2.38.0.rc1.362.ged0d419d3c-goog