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")
Cc: devicetree@xxxxxxxxxxxxxxx
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
ChangeLog v2->v3:
- Collect Rob's ACK.
---
Documentation/devicetree/bindings/spi/spi-gpio.txt | 24 ++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)
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>;
--
2.14.3
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