2016-12-02 10:50:26 +00:00
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From 58c72d20f05a5943b48d834e8388a58332897ed8 Mon Sep 17 00:00:00 2001
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2016-06-08 09:59:37 +00:00
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From: Michael Kaplan <m.kaplan@evva.com>
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Date: Tue, 24 May 2016 10:19:08 +0200
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2016-09-10 12:54:26 +00:00
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Subject: [PATCH] Added Overlay for Microchip MCP23017 I2C gpio expander
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2016-06-08 09:59:37 +00:00
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---
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arch/arm/boot/dts/overlays/README | 9 +++++
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arch/arm/boot/dts/overlays/mcp23017-overlay.dts | 54 +++++++++++++++++++++++++
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2 files changed, 63 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/mcp23017-overlay.dts
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -567,6 +567,15 @@ Params: gpio_out_pin GPIO for
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(default "off")
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+Name: mcp23017
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+Info: Configures the MCP23017 I2C port expander
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+Load: dtoverlay=mcp23017,<param>=<val>
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+Params: gpiopin Gpio pin connected to the INTA output of the
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+ MCP23017 (default: 4)
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+
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+ addr I2C address of the MCP23017 (default: 0x20)
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+
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+
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Name: mcp2515-can0
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Info: Configures the MCP2515 CAN controller on spi0.0
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Load: dtoverlay=mcp2515-can0,<param>=<val>
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
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@@ -0,0 +1,54 @@
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+// Definitions for MCP23017 Gpio Extender from Microchip Semiconductor
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+
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
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+
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+ fragment@0 {
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+ target = <&i2c1>;
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+ __overlay__ {
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ mcp23017_pins: mcp23017_pins {
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+ brcm,pins = <4>;
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+ brcm,function = <0>;
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+ };
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+ };
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+ };
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+
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+ fragment@2 {
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+ target = <&i2c1>;
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+ __overlay__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ mcp23017: mcp@20 {
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+ compatible = "microchip,mcp23017";
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+ reg = <0x20>;
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+ gpio-controller;
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+ #gpio-cells = <2>;
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+ #interrupt-cells=<2>;
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+ interrupt-parent = <&gpio>;
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+ interrupts = <4 2>;
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+ interrupt-controller;
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+ microchip,irq-mirror;
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+
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+ status = "okay";
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ gpiopin = <&mcp23017_pins>,"brcm,pins:0",
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+ <&mcp23017>,"interrupts:0";
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+ addr = <&mcp23017>,"reg:0";
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+ };
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+};
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+
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