[3/5] spi: spi-gpio: Augment device tree bindings

Message ID 20180101133749.29567-4-linus.walleij@linaro.org
State Superseded
Headers show
Series
  • Rewrite GPIO SPI to use descriptors
Related show

Commit Message

Linus Walleij Jan. 1, 2018, 1:37 p.m.
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.

Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

---
 Documentation/devicetree/bindings/spi/spi-gpio.txt | 24 ++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

-- 
2.14.3

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Patch

diff --git a/Documentation/devicetree/bindings/spi/spi-gpio.txt b/Documentation/devicetree/bindings/spi/spi-gpio.txt
index a95603bcf6ff..52db562f17a4 100644
--- 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>;