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| author | Fabio Estevam <festevam@gmail.com> | 2020-08-20 00:04:24 +0300 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2020-08-30 04:37:20 +0300 |
| commit | 2bfdd113d0ee1ea40fbb49f181fea352a7e5e1a7 (patch) | |
| tree | f8ca59a746d02d138630720c740f8ba0c76b5f68 /arch/arm/boot/dts/imx6qdl-ts7970.dtsi | |
| parent | 0b784a7b1c53c3989e9ee2dfdd3fc9b6b14b5256 (diff) | |
| download | linux-2bfdd113d0ee1ea40fbb49f181fea352a7e5e1a7.tar.xz | |
ARM: dts: imx: 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:
[ 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: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'arch/arm/boot/dts/imx6qdl-ts7970.dtsi')
| -rw-r--r-- | arch/arm/boot/dts/imx6qdl-ts7970.dtsi | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/arm/boot/dts/imx6qdl-ts7970.dtsi b/arch/arm/boot/dts/imx6qdl-ts7970.dtsi index f0be516dc28e..e6aa0c33754d 100644 --- a/arch/arm/boot/dts/imx6qdl-ts7970.dtsi +++ b/arch/arm/boot/dts/imx6qdl-ts7970.dtsi @@ -165,7 +165,7 @@ }; &ecspi1 { - cs-gpios = <&gpio3 19 GPIO_ACTIVE_HIGH>; + cs-gpios = <&gpio3 19 GPIO_ACTIVE_LOW>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_ecspi1>; status = "okay"; @@ -179,9 +179,9 @@ &ecspi2 { cs-gpios = < - &gpio5 31 GPIO_ACTIVE_HIGH - &gpio7 12 GPIO_ACTIVE_HIGH - &gpio5 18 GPIO_ACTIVE_HIGH + &gpio5 31 GPIO_ACTIVE_LOW + &gpio7 12 GPIO_ACTIVE_LOW + &gpio5 18 GPIO_ACTIVE_LOW >; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_ecspi2>; |