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From c85a1ccbc6b1cab51a5fe5b916bcaf40bcd9096c Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 21 Jan 2019 12:19:57 +0000
Subject: [PATCH] overlays: mcp23017: Support the MCP23008
Add an 'mcp23008' parameter to enable support for the MCP23008 device.
See: https://github.com/raspberrypi/linux/issues/2818
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
arch/arm/boot/dts/overlays/README | 2 ++
arch/arm/boot/dts/overlays/mcp23017-overlay.dts | 10 +++++++++-
2 files changed, 11 insertions(+), 1 deletion(-)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1212,6 +1212,8 @@ Params: gpiopin Gpio pin
addr I2C address of the MCP23017 (default: 0x20)
+ mcp23008 Configure an MCP23008 instead.
+
Name: mcp23s17
Info: Configures the MCP23S08/17 SPI GPIO expanders.
--- a/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
+++ b/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
@@ -44,11 +44,19 @@
};
};
};
-
+
+ fragment@3 {
+ target = <&mcp23017>;
+ __dormant__ {
+ compatible = "microchip,mcp23008";
+ };
+ };
+
__overrides__ {
gpiopin = <&mcp23017_pins>,"brcm,pins:0",
<&mcp23017>,"interrupts:0";
addr = <&mcp23017>,"reg:0";
+ mcp23008 = <0>,"=3";
};
};
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