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authorFabio Estevam <festevam@gmail.com>2021-07-16 10:28:45 -0300
committerShawn Guo <shawnguo@kernel.org>2021-09-22 10:48:56 +0800
commitc6fe862aa35c741b5b82cc5bda5f0c3cebf11bde (patch)
tree15c630d60fa9651f02a39054ba8a4ba1f28a48cc /arch/arm64/boot/dts/freescale/imx8mm-venice-gw72xx.dtsi
parentbdd166bee8270534e42dc41793a43f3ec3b20dc9 (diff)
arm64: dts: imx8mm-venice: 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 <festevam@gmail.com> Reviewed-By: Tim Harvey <tharvey@gateworks.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'arch/arm64/boot/dts/freescale/imx8mm-venice-gw72xx.dtsi')
-rw-r--r--arch/arm64/boot/dts/freescale/imx8mm-venice-gw72xx.dtsi2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw72xx.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw72xx.dtsi
index b7c91bdc21dd..27afa46a253a 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw72xx.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw72xx.dtsi
@@ -76,7 +76,7 @@
&ecspi2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_spi2>;
- cs-gpios = <&gpio5 13 GPIO_ACTIVE_HIGH>;
+ cs-gpios = <&gpio5 13 GPIO_ACTIVE_LOW>;
status = "okay";
};