forked from Minki/linux
77a060533c
After we augmented the core to handle "gpio-sck"/"sck-gpios",
"gpio-mosi"/"mosi-gpios", "gpio-miso"/"miso-gpios" alike,
deprecate the old binding and put the strict modern and
recommended binding practice into place as the default for
GPIO-based SPI.
This reflects the similar change in I2C:
commit 7d29f509d2
("dt-bindings: i2c: i2c-gpio: Add support for named gpios")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
44 lines
1.1 KiB
Plaintext
44 lines
1.1 KiB
Plaintext
SPI-GPIO devicetree bindings
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This represents a group of 3-n GPIO lines used for bit-banged SPI on dedicated
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GPIO lines.
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Required properties:
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- compatible: should be set to "spi-gpio"
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- #address-cells: should be set to <0x1>
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- ranges
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- sck-gpios: GPIO spec for the SCK line to use
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- miso-gpios: GPIO spec for the MISO line to use
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- mosi-gpios: GPIO spec for the MOSI line to use
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- cs-gpios: GPIOs to use for chipselect lines.
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Not needed if num-chipselects = <0>.
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- num-chipselects: Number of chipselect lines. Should be <0> if a single device
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with no chip select is connected.
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Deprecated bindings:
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These legacy GPIO line bindings can alternatively be used to define the
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GPIO lines used, they should not be used in new device trees.
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- gpio-sck: GPIO spec for the SCK line to use
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- gpio-miso: GPIO spec for the MISO line to use
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- gpio-mosi: GPIO spec for the MOSI line to use
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Example:
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spi {
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compatible = "spi-gpio";
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#address-cells = <0x1>;
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ranges;
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sck-gpios = <&gpio 95 0>;
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miso-gpios = <&gpio 98 0>;
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mosi-gpios = <&gpio 97 0>;
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cs-gpios = <&gpio 125 0>;
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num-chipselects = <1>;
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/* clients */
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};
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