[v3] dt-bindings: GPIO: Add generic serializer binding
diff mbox

Message ID 1457117924-7014-1-git-send-email-afd@ti.com
State New
Headers show

Commit Message

Andrew F. Davis March 4, 2016, 6:58 p.m. UTC
Add binding for generic parallel-in/serial-out shift register devices
used as GPIO.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
---
The driver was taken but it looks like this might have been lost,
anyway I've added a dual-string example as requested.

 .../devicetree/bindings/gpio/gpio-pisosr.txt       | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/gpio-pisosr.txt

Comments

Linus Walleij March 15, 2016, 8:55 a.m. UTC | #1
On Fri, Mar 4, 2016 at 7:58 PM, Andrew F. Davis <afd@ti.com> wrote:

> Add binding for generic parallel-in/serial-out shift register devices
> used as GPIO.
>
> Signed-off-by: Andrew F. Davis <afd@ti.com>
> Acked-by: Rob Herring <robh@kernel.org>
> ---
> The driver was taken but it looks like this might have been lost,
> anyway I've added a dual-string example as requested.

Ah I missed it, mea culpa.

Patch applied, I edited the ngpios text a bit to reflect that this
signifies that you use 0..n-1 offsets.

Yours,
Linus Walleij
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Patch
diff mbox

diff --git a/Documentation/devicetree/bindings/gpio/gpio-pisosr.txt b/Documentation/devicetree/bindings/gpio/gpio-pisosr.txt
new file mode 100644
index 0000000..dab8c9f
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-pisosr.txt
@@ -0,0 +1,34 @@ 
+Generic Parallel-in/Serial-out Shift Register GPIO Driver
+
+This binding describes generic parallel-in/serial-out shift register
+devices that can be used for GPI (General Purpose Input). This includes
+SN74165 serial-out shift registers and the SN65HVS88x series of
+industrial serializers.
+
+Required properties:
+ - compatible		: Should be "pisosr-gpio".
+ - gpio-controller	: Marks the device node as a GPIO controller.
+ - #gpio-cells		: Should be two. For consumer use see gpio.txt.
+
+Optional properties:
+ - ngpios		: Number of GPIO lines, default is 8.
+ - load-gpios		: GPIO pin specifier attached to load enable, this
+			  pin is pulsed before reading from the device to
+			  load input pin values into the the device.
+
+For other required and optional properties of SPI slave
+nodes please refer to ../spi/spi-bus.txt.
+
+Example:
+
+	gpio@0 {
+		compatible = "ti,sn65hvs882", "pisosr-gpio";
+		gpio-controller;
+		#gpio-cells = <2>;
+
+		load-gpios = <&gpio2 23 GPIO_ACTIVE_LOW>;
+
+		reg = <0>;
+		spi-max-frequency = <1000000>;
+		spi-cpol;
+	};