diff options
| author | Fabio Estevam <festevam@gmail.com> | 2021-07-16 10:28:44 -0300 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2021-09-22 10:47:55 +0800 |
| commit | bdd166bee8270534e42dc41793a43f3ec3b20dc9 (patch) | |
| tree | 2d17c07c67be5216b4b9a168c21101e4229d179f /arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi | |
| parent | 6880fa6c56601bb8ed59df6c30fd390cc5f6dd8f (diff) | |
arm64: dts: imx8mm-kontron-n801x-som: 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: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi')
| -rw-r--r-- | arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi index d0456daefda8..5a2805c51361 100644 --- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi @@ -63,7 +63,7 @@ &ecspi1 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_ecspi1>; - cs-gpios = <&gpio5 9 GPIO_ACTIVE_HIGH>; + cs-gpios = <&gpio5 9 GPIO_ACTIVE_LOW>; status = "okay"; spi-flash@0 { |