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domenico
2025-06-24 12:51:15 +02:00
commit 27c9d80f51
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From: John Crispin <blogic@openwrt.org>
Date: Sun, 28 Jul 2013 19:45:30 +0200
Subject: [PATCH 1/3] DT: Add documentation for gpio-ralink
Describe gpio-ralink binding.
Signed-off-by: John Crispin <blogic@openwrt.org>
---
.../devicetree/bindings/gpio/gpio-ralink.txt | 36 +++++++++++++++++++
1 file changed, 36 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-ralink.txt
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-ralink.txt
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+Ralink SoC GPIO controller bindings
+
+Required properties:
+- compatible:
+ - "ralink,rt2880-gpio" for Ralink controllers
+- #gpio-cells : Should be two.
+ - first cell is the pin number
+ - second cell is used to specify optional parameters (unused)
+- gpio-controller : Marks the device node as a GPIO controller
+- reg : Physical base address and length of the controller's registers
+- interrupt-parent: phandle to the INTC device node
+- interrupts : Specify the INTC interrupt number
+- ngpios : Specify the number of GPIOs
+- ralink,register-map : The register layout depends on the GPIO bank and actual
+ SoC type. Register offsets need to be in this order.
+ [ INT, EDGE, RENA, FENA, DATA, DIR, POL, SET, RESET, TOGGLE ]
+
+Example:
+
+ gpio0: gpio@600 {
+ compatible = "ralink,rt2880-gpio";
+
+ #gpio-cells = <2>;
+ gpio-controller;
+
+ reg = <0x600 0x34>;
+
+ interrupt-parent = <&intc>;
+ interrupts = <6>;
+
+ ngpios = <24>;
+ ralink,register-map = [ 00 04 08 0c
+ 20 24 28 2c
+ 30 34 ];
+
+ };