mirror of
https://github.com/torvalds/linux.git
synced 2024-12-24 20:01:55 +00:00
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
|
|
|
|
This represents a group of 3-n GPIO lines used for bit-banged SPI on dedicated
|
|
GPIO lines.
|
|
|
|
Required properties:
|
|
|
|
- compatible: should be set to "spi-gpio"
|
|
- #address-cells: should be set to <0x1>
|
|
- ranges
|
|
- sck-gpios: GPIO spec for the SCK line to use
|
|
- miso-gpios: GPIO spec for the MISO line to use
|
|
- mosi-gpios: GPIO spec for the MOSI line to use
|
|
- cs-gpios: GPIOs to use for chipselect lines.
|
|
Not needed if num-chipselects = <0>.
|
|
- num-chipselects: Number of chipselect lines. Should be <0> if a single device
|
|
with no chip select is connected.
|
|
|
|
Deprecated bindings:
|
|
|
|
These legacy GPIO line bindings can alternatively be used to define the
|
|
GPIO lines used, they should not be used in new device trees.
|
|
|
|
- gpio-sck: GPIO spec for the SCK line to use
|
|
- gpio-miso: GPIO spec for the MISO line to use
|
|
- gpio-mosi: GPIO spec for the MOSI line to use
|
|
|
|
Example:
|
|
|
|
spi {
|
|
compatible = "spi-gpio";
|
|
#address-cells = <0x1>;
|
|
ranges;
|
|
|
|
sck-gpios = <&gpio 95 0>;
|
|
miso-gpios = <&gpio 98 0>;
|
|
mosi-gpios = <&gpio 97 0>;
|
|
cs-gpios = <&gpio 125 0>;
|
|
num-chipselects = <1>;
|
|
|
|
/* clients */
|
|
};
|
|
|