mirror of
https://github.com/brain-hackers/u-boot-brain
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32466c445c
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>
39 lines
1.1 KiB
Plaintext
39 lines
1.1 KiB
Plaintext
Soft SPI
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The soft SPI bus implementation allows the use of GPIO pins to simulate a
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SPI bus. No SPI host is required for this to work. The down-side is that the
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performance will typically be much lower than a real SPI bus.
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The soft SPI node requires the following properties:
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Mandatory properties:
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compatible: "spi-gpio"
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cs-gpios: GPIOs to use for SPI chip select (output)
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gpio-sck: GPIO to use for SPI clock (output)
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And at least one of:
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gpio-mosi: GPIO to use for SPI MOSI line (output)
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gpio-miso: GPIO to use for SPI MISO line (input)
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Optional propertie:
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spi-delay-us: Number of microseconds of delay between each CS transition
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The GPIOs should be specified as required by the GPIO controller referenced.
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The first cell holds the phandle of the controller and the second cell
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typically holds the GPIO number.
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Example:
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soft-spi {
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compatible = "spi-gpio";
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cs-gpios = <&gpio 235 0>; /* Y43 */
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gpio-sck = <&gpio 225 0>; /* Y31 */
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gpio-mosi = <&gpio 227 0>; /* Y33 */
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gpio-miso = <&gpio 224 0>; /* Y30 */
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spi-delay-us = <1>;
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#address-cells = <1>;
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#size-cells = <0>;
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cs@0 {
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};
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};
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