dt-bindings: at25: add reference for the wp-gpios property

As the at25 uses the NVMEM subsystem, and the property is now being
handled, adding reference for it in the device tree binding document,
which allows to specify the GPIO line to which the write-protect pin
is connected.

Signed-off-by: Khouloud Touil <ktouil@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

diff --git a/Documentation/devicetree/bindings/eeprom/at25.txt b/Documentation/devicetree/bindings/eeprom/at25.txt
index 42577dd113ddf939ca2910a57c6f53c1830ab298..fcacd97abd0aec927a233b9624e9e14d9ca5388e 100644 (file)
--- a/Documentation/devicetree/bindings/eeprom/at25.txt
+++ b/Documentation/devicetree/bindings/eeprom/at25.txt
@@ -20,6 +20,7 @@ Optional properties:
 - spi-cpha : SPI shifted clock phase, as per spi-bus bindings.
 - spi-cpol : SPI inverse clock polarity, as per spi-bus bindings.
 - read-only : this parameter-less property disables writes to the eeprom
+- wp-gpios : GPIO to which the write-protect pin of the chip is connected
 
 Obsolete legacy properties can be used in place of "size", "pagesize",
 "address-width", and "read-only":
@@ -36,6 +37,7 @@ Example:
                spi-max-frequency = <5000000>;
                spi-cpha;
                spi-cpol;
+               wp-gpios = <&gpio1 3 0>;
 
                pagesize = <64>;
                size = <32768>;