Device tree binding documentation for Broadcom NSP GPIO-a driver
Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yrdre...@broadcom.com>
---
.../devicetree/bindings/pinctrl/brcm,nsp-gpio.txt | 80 ++++++++++++++++++++++
1 file changed, 80 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
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index 0000000..bea4211
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+Broadcom Northstar plus (NSP) GPIO/PINCONF Controller
+
+Required properties:
+- compatible:
+ Must be "brcm,nsp-gpio-a"
+
+- reg:
+ Should contain the register physical address and length for each of
+ GPIO base, IO control registers
+
+- #gpio-cells:
+ Must be two. The first cell is the GPIO pin number (within the
+ controller's pin space) and the second cell is used for the following:
+ bit[0]: polarity (0 for active high and 1 for active low)
+
+- gpio-controller:
+ Specifies that the node is a GPIO controller
+
+- ngpios:
+ Number of gpios supported (58x25 supports 32 and 58x23 supports 24)
+
+Optional properties:
+- interrupts:
+ Interrupt ID
+
+- interrupt-controller:
+ Specifies that the node is an interrupt controller
+
+- gpio-ranges:
+ Specifies the mapping between gpio controller and pin-controllers pins.
+ This requires 4 fields in cells defined as -
+ 1. Phandle of pin-controller.
+ 2. GPIO base pin offset.
+ 3 Pin-control base pin offset.
+ 4. number of gpio pins which are linearly mapped from pin base.
+
+Supported generic PINCONF properties in child nodes:
+- pins:
+ The list of pins (within the controller's own pin space) that properties
+ in the node apply to. Pin names are "gpio-<pin>"
+
+- bias-disable:
+ Disable pin bias
+
+- bias-pull-up:
+ Enable internal pull up resistor
+
+- bias-pull-down:
+ Enable internal pull down resistor
+
+- drive-strength:
+ Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
+
+Example:
+
+ gpioa: gpio-a@18000020 {
+ compatible = "brcm,nsp-gpio-a";
+ reg = <0x18000020 0x100>,
+ <0x1803f1c4 0x1c>;
+ #gpio-cells = <2>;
+ gpio-controller;
+ ngpios = <32>;
+ gpio-ranges = <&pinctrl 0 0 31>;
+ interrupt-controller;
+ interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
+
+ /* Hog a few default settings */
+ pinctrl-names = "default";
+ pinctrl-0 = <&led>;
+ led: led {
+ pins = "gpio-1";
+ bias-pull-up;
+ };
+
+ pwr: pwr {
+ gpio-hog;
+ gpios = <3 1>;
+ output-high;
+ };
+ };
--
2.1.0
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