Re: [PATCH V5 2/3] Documentation: gpio: Add APM X-Gene SoC GPIO controller DTS binding
From: Mark Rutland <mark.rutland@arm.com>
Date: 2014-06-30 12:53:39
Also in:
linux-arm-kernel, linux-gpio
On Thu, Jun 26, 2014 at 11:59:46PM +0100, Feng Kan wrote:
quoted hunk ↗ jump to hunk
Documentation for APM X-Gene SoC GPIO controller DTS binding. Signed-off-by: Feng Kan <redacted> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> --- .../devicetree/bindings/gpio/gpio-xgene.txt | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-xgene.txtdiff --git a/Documentation/devicetree/bindings/gpio/gpio-xgene.txt b/Documentation/devicetree/bindings/gpio/gpio-xgene.txt new file mode 100644 index 0000000..bd5fd85 --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-xgene.txt@@ -0,0 +1,20 @@ +APM X-Gene SoC GPIO controller bindings + +This is a gpio controller that is part of the flash controller. +This gpio controller controls a total of 48 gpios. + +Required properties: +- compatible: "apm,xgene-gpio" for X-Gene GPIO controller +- reg: Physical base address and size of the controller's registers
There is just the one bank?
+- #gpio-cells: Should be two. + - first cell is the pin number + - second cell is used to specify optional parameters (unused)
Why is there an unused cell? Why not just make this a single cell if the binding defines no valid parameters?
+- gpio-controller: Marks the device node as a GPIO controller.
No interrupts? Thanks, Mark.
+
+Example:
+ gpio0: gpio0@1701c000 {
+ compatible = "apm,xgene-gpio";
+ reg = <0x0 0x1701c000 0x0 0x40>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
--
1.9.1
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