Document the GPIO/PINCONF device tree binding for Broadcom Cygnus SoC
Signed-off-by: Ray Jui <rjui@xxxxxxxxxxxx>
Reviewed-by: Scott Branden <sbranden@xxxxxxxxxxxx>
---
.../bindings/pinctrl/brcm,cygnus-gpio.txt | 102 ++++++++++++++++++++
1 file changed, 102 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..9b9196c
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
@@ -0,0 +1,102 @@
+Broadcom Cygnus GPIO/PINCONF Controller
+
+Required properties:
+
+- compatible:
+ Must be "brcm,cygnus-gpio"
+
+- reg:
+ Define the base and range of the I/O address space that contains the Cygnus
+GPIO/PINCONF controller registers
+
+- ngpios:
+ Total number of GPIOs the controller provides
+
+- #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
+
+Optional properties:
+
+- interrupts:
+ Interrupt ID
+
+- interrupt-controller:
+ Specifies that the node is an interrupt controller
+
+- pinmux:
+ Specifies the phandle to the IOMUX device, where pins can be individually
+muxed to GPIO
+
+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:
+ gpio_ccm: gpio@1800a000 {
+ compatible = "brcm,cygnus-gpio";
+ reg = <0x1800a000 0x50>,
+ <0x0301d164 0x20>;
+ ngpios = <24>;
+ #gpio-cells = <2>;
+ gpio-controller;
+ interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-controller;
+
+ touch_pins: touch_pins {
+ pwr: pwr {
+ pins = "gpio-0";
+ drive-strength = <16>;
+ };
+
+ event: event {
+ pins = "gpio-1";
+ bias-pull-up;
+ };
+ };
+ };
+
+ gpio_asiu: gpio@180a5000 {
+ compatible = "brcm,cygnus-gpio";
+ reg = <0x180a5000 0x668>;
+ ngpios = <146>;
+ #gpio-cells = <2>;
+ gpio-controller;
+ interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-controller;
+ };
+
+ /*
+ * Touchscreen that uses the CCM GPIO 0 and 1
+ */
+ tsc {
+ ...
+ ...
+ gpio-pwr = <&gpio_ccm 0 0>;
+ gpio-event = <&gpio_ccm 1 0>;
+ };
+
+ /* Bluetooth that uses the ASIU GPIO 5, with polarity inverted */
+ bluetooth {
+ ...
+ ...
+ bcm,rfkill-bank-sel = <&gpio_asiu 5 1>
+ }
--
1.7.9.5
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