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From 58c72d20f05a5943b48d834e8388a58332897ed8 Mon Sep 17 00:00:00 2001
From: Michael Kaplan <m.kaplan@evva.com>
Date: Tue, 24 May 2016 10:19:08 +0200
Subject: [PATCH] Added Overlay for Microchip MCP23017 I2C gpio expander
---
arch/arm/boot/dts/overlays/README | 9 +++++
arch/arm/boot/dts/overlays/mcp23017-overlay.dts | 54 +++++++++++++++++++++++++
2 files changed, 63 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/mcp23017-overlay.dts
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -567,6 +567,15 @@ Params: gpio_out_pin GPIO for
(default "off")
+Name: mcp23017
+Info: Configures the MCP23017 I2C port expander
+Load: dtoverlay=mcp23017,<param>=<val>
+Params: gpiopin Gpio pin connected to the INTA output of the
+ MCP23017 (default: 4)
+
+ addr I2C address of the MCP23017 (default: 0x20)
+
+
Name: mcp2515-can0
Info: Configures the MCP2515 CAN controller on spi0.0
Load: dtoverlay=mcp2515-can0,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
@@ -0,0 +1,54 @@
+// Definitions for MCP23017 Gpio Extender from Microchip Semiconductor
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
+
+ fragment@0 {
+ target = <&i2c1>;
+ __overlay__ {
+ status = "okay";
+ };
+ };
+
+ fragment@1 {
+ target = <&gpio>;
+ __overlay__ {
+ mcp23017_pins: mcp23017_pins {
+ brcm,pins = <4>;
+ brcm,function = <0>;
+ };
+ };
+ };
+
+ fragment@2 {
+ target = <&i2c1>;
+ __overlay__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mcp23017: mcp@20 {
+ compatible = "microchip,mcp23017";
+ reg = <0x20>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ #interrupt-cells=<2>;
+ interrupt-parent = <&gpio>;
+ interrupts = <4 2>;
+ interrupt-controller;
+ microchip,irq-mirror;
+
+ status = "okay";
+ };
+ };
+ };
+
+ __overrides__ {
+ gpiopin = <&mcp23017_pins>,"brcm,pins:0",
+ <&mcp23017>,"interrupts:0";
+ addr = <&mcp23017>,"reg:0";
+ };
+};
+
|
