[PATCH v2 1/2] gpio: dt-bindings: add brcm,bcm6345-gpio bindings

From: Ãlvaro FernÃndez Rojas
Date: Wed Aug 03 2016 - 08:06:33 EST


This patch adds the device tree bindings for the Broadcom's BCM6345
memory-mapped GPIO controllers.

The gpios will be supported by gpio-mmio code of the
GPIO generic library.

Signed-off-by: Ãlvaro FernÃndez Rojas <noltari@xxxxxxxxx>
---
v2: add improvements suggested by Jonas Gorski:
- use native-endian instead of big-endian.
- use gpio alias instead of gpio0.
- be less dramatic with newer Broadcom SoCs.
- reorder patches.

.../devicetree/bindings/gpio/brcm,bcm6345-gpio.txt | 46 ++++++++++++++++++++++
1 file changed, 46 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/brcm,bcm6345-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,bcm6345-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,bcm6345-gpio.txt
new file mode 100644
index 0000000..e785314
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,bcm6345-gpio.txt
@@ -0,0 +1,46 @@
+Bindings for the Broadcom's brcm,bcm6345-gpio memory-mapped GPIO controllers.
+
+These bindings can be used on any BCM63xx SoC. However, BCM6338 and BCM6345
+are the only ones which don't need a pinctrl driver.
+BCM6338 have 8-bit data and dirout registers, where GPIO state can be read
+and/or written, and the direction changed from input to output.
+BCM6345 have 16-bit data and dirout registers, where GPIO state can be read
+and/or written, and the direction changed from input to output.
+
+Required properties:
+ - compatible: should be "brcm,bcm6345-gpio"
+ - reg-names: must contain
+ "dat" - data register
+ "dirout" - direction (output) register
+ - reg: address + size pairs describing the GPIO register sets;
+ order must correspond with the order of entries in reg-names
+ - #gpio-cells: must be set to 2. The first cell is the pin number and
+ the second cell is used to specify the gpio polarity:
+ 0 = active high
+ 1 = active low
+ - gpio-controller: Marks the device node as a gpio controller.
+
+Optional properties:
+ - native-endian: use native endian memory.
+
+Examples:
+ - BCM6338:
+ gpio: gpio-controller@fffe0407 {
+ compatible = "brcm,bcm6345-gpio";
+ reg-names = "dirout", "dat";
+ reg = <0xfffe0407 1>, <0xfffe040f 1>;
+
+ #gpio-cells = <2>;
+ gpio-controller;
+ };
+
+ - BCM6345:
+ gpio: gpio-controller@fffe0406 {
+ compatible = "brcm,bcm6345-gpio";
+ reg-names = "dirout", "dat";
+ reg = <0xfffe0406 2>, <0xfffe040a 2>;
+ native-endian;
+
+ #gpio-cells = <2>;
+ gpio-controller;
+ };
--
2.1.4