From 70b211ddcf9df5df288fcf648a032394cb3b84f0 Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Fri, 16 Jul 2021 10:36:57 -0300 Subject: ARM: dts: imx6qp-prtwd3: Fix the SPI chipselect polarity The conversion of the spi-imx driver to use GPIO descriptors in commit 8cdcd8aeee28 ("spi: imx/fsl-lpspi: Convert to GPIO descriptors") helped to detect the following SPI chipselect polarity mismatch on an imx6q-sabresd for example: [ 4.854337] m25p80@0 enforce active low on chipselect handle Prior to the above commit, the chipselect polarity passed via cs-gpios property was ignored and considered active-low. The reason for such mismatch is clearly explained in the comments inside drivers/gpio/gpiolib-of.c: * SPI children have active low chip selects * by default. This can be specified negatively * by just omitting "spi-cs-high" in the * device node, or actively by tagging on * GPIO_ACTIVE_LOW as flag in the device * tree. If the line is simultaneously * tagged as active low in the device tree * and has the "spi-cs-high" set, we get a * conflict and the "spi-cs-high" flag will * take precedence. To properly represent the SPI chipselect polarity, change it to active-low when the "spi-cs-high" property is absent. Signed-off-by: Fabio Estevam Reviewed-by: Oleksij Rempel Signed-off-by: Shawn Guo --- arch/arm/boot/dts/imx6qp-prtwd3.dts | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/boot/dts/imx6qp-prtwd3.dts b/arch/arm/boot/dts/imx6qp-prtwd3.dts index b92e0f2748a5..7648e8a02000 100644 --- a/arch/arm/boot/dts/imx6qp-prtwd3.dts +++ b/arch/arm/boot/dts/imx6qp-prtwd3.dts @@ -123,7 +123,7 @@ }; &ecspi2 { - cs-gpios = <&gpio2 26 GPIO_ACTIVE_HIGH>; + cs-gpios = <&gpio2 26 GPIO_ACTIVE_LOW>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_ecspi2>; status = "okay"; @@ -189,7 +189,7 @@ }; &ecspi3 { - cs-gpios = <&gpio4 24 GPIO_ACTIVE_HIGH>; + cs-gpios = <&gpio4 24 GPIO_ACTIVE_LOW>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_ecspi3>; status = "okay"; -- cgit