linux-kernel - [PATCH] DTS: ARM: gta04: SPI panel chip select is active low

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Date:   Wed, 23 Dec 2020 11:30:21 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, letux-kernel@...nphoenux.org,
        Andreas Kemnade <andreas@...nade.info>,
        kernel@...a-handheld.com,
        "H. Nikolaus Schaller" <hns@...delico.com>, stable@...r.kernel.org
Subject: [PATCH] DTS: ARM: gta04: SPI panel chip select is active low

With the arrival of

commit 2fee9583198eb9 ("spi: dt-bindings: clarify CS behavior for spi-cs-high and gpio descriptors")

it was clarified what the proper state for cs-gpios should be, even if the
flag is ignored. The driver code is doing the right thing since

766c6b63aa04 ("spi: fix client driver breakages when using GPIO descriptors")

The chip-select of the td028ttec1 panel is active-low, so we must omit spi-cs-high;
attribute (already removed by separate patch) and should now use GPIO_ACTIVE_LOW for
the client device description to be fully consistent.

Fixes: 766c6b63aa04 ("spi: fix client driver breakages when using GPIO descriptors")
CC: stable@...r.kernel.org
Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
---
 arch/arm/boot/dts/omap3-gta04.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/omap3-gta04.dtsi b/arch/arm/boot/dts/omap3-gta04.dtsi
index 003202d129907b..7b8c18e6605e40 100644
--- a/arch/arm/boot/dts/omap3-gta04.dtsi
+++ b/arch/arm/boot/dts/omap3-gta04.dtsi
@@ -114,7 +114,7 @@ spi_lcd: spi_lcd {
 		gpio-sck = <&gpio1 12 GPIO_ACTIVE_HIGH>;
 		gpio-miso = <&gpio1 18 GPIO_ACTIVE_HIGH>;
 		gpio-mosi = <&gpio1 20 GPIO_ACTIVE_HIGH>;
-		cs-gpios = <&gpio1 19 GPIO_ACTIVE_HIGH>;
+		cs-gpios = <&gpio1 19 GPIO_ACTIVE_LOW>;
 		num-chipselects = <1>;
 
 		/* lcd panel */
-- 
2.26.2