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doc: bindings: soft-spi: update documentation to match the code

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Linux bindings have been introduced in the code (removing the U-Boot
specific ones) without documentation update. Compatible string has
changed, as well as the four GPIO properties. Reflect this by updating
the soft-spi.txt documentation.

Fixes: 102412c415 ("dm: spi: soft_spi: switch to use linux compatible string")
Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Miquel Raynal 2017-12-29 15:55:55 +01:00 • committed by Jagan Teki
parent 98691a60ab
commit 32466c445c
1 changed files with 14 additions and 10 deletions
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24
doc/device-tree-bindings/spi/soft-spi.txt
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@ -6,11 +6,15 @@ performance will typically be much lower than a real SPI bus.
The soft SPI node requires the following properties:
compatible: "u-boot,soft-spi"
soft_spi_cs: GPIO number to use for SPI chip select (output)
soft_spi_sclk: GPIO number to use for SPI clock (output)
soft_spi_mosi: GPIO number to use for SPI MOSI line (output)
soft_spi_miso GPIO number to use for SPI MISO line (input)
Mandatory properties:
compatible: "spi-gpio"
cs-gpios: GPIOs to use for SPI chip select (output)
gpio-sck: GPIO to use for SPI clock (output)
And at least one of:
gpio-mosi: GPIO to use for SPI MOSI line (output)
gpio-miso: GPIO to use for SPI MISO line (input)
Optional propertie:
spi-delay-us: Number of microseconds of delay between each CS transition
The GPIOs should be specified as required by the GPIO controller referenced.
@ -21,11 +25,11 @@ typically holds the GPIO number.
Example:
soft-spi {
compatible = "u-boot,soft-spi";
cs-gpio = <&gpio 235 0>; /* Y43 */
sclk-gpio = <&gpio 225 0>; /* Y31 */
mosi-gpio = <&gpio 227 0>; /* Y33 */
miso-gpio = <&gpio 224 0>; /* Y30 */
compatible = "spi-gpio";
cs-gpios = <&gpio 235 0>; /* Y43 */
gpio-sck = <&gpio 225 0>; /* Y31 */
gpio-mosi = <&gpio 227 0>; /* Y33 */
gpio-miso = <&gpio 224 0>; /* Y30 */
spi-delay-us = <1>;
#address-cells = <1>;
#size-cells = <0>;