spi: spi-gpio: Augment device tree bindings

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 7d29f509d2cf
("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>

diff --git a/Documentation/devicetree/bindings/spi/spi-gpio.txt b/Documentation/devicetree/bindings/spi/spi-gpio.txt
index a95603b..52db562 100644 (file)
--- a/Documentation/devicetree/bindings/spi/spi-gpio.txt
+++ b/Documentation/devicetree/bindings/spi/spi-gpio.txt
@@ -1,18 +1,30 @@
 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
- - 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
+ - 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 {
@@ -20,9 +32,9 @@ Example:
                #address-cells = <0x1>;
                ranges;
 
-               gpio-sck = <&gpio 95 0>;
-               gpio-miso = <&gpio 98 0>;
-               gpio-mosi = <&gpio 97 0>;
+               sck-gpios = <&gpio 95 0>;
+               miso-gpios = <&gpio 98 0>;
+               mosi-gpios = <&gpio 97 0>;
                cs-gpios = <&gpio 125 0>;
                num-chipselects = <1>;