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149 lines
3.6 KiB
Diff
149 lines
3.6 KiB
Diff
From b71f1fd962c66ba3fa46483f193cc2263146c5bf Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Mon, 21 Jan 2019 12:23:55 +0000
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Subject: [PATCH] overlays: Add mcp342x overlay
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Support the MCP342x family of ADCs from Microchip.
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See: https://github.com/raspberrypi/linux/issues/2819
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 16 ++++
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.../arm/boot/dts/overlays/mcp342x-overlay.dts | 93 +++++++++++++++++++
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3 files changed, 110 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/mcp342x-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -79,6 +79,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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mcp2515-can1.dtbo \
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mcp3008.dtbo \
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mcp3202.dtbo \
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+ mcp342x.dtbo \
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media-center.dtbo \
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midi-uart0.dtbo \
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midi-uart1.dtbo \
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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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@@ -1277,6 +1277,22 @@ Params: spi<n>-<m>-present boolean,
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spi<n>-<m>-speed integer, set the spi bus speed for this device
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+Name: mcp342x
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+Info: Overlay for activation of Microchip MCP3421-3428 ADCs over I2C
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+Load: dtoverlay=mcp342x,<param>=<val>
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+Params: addr I2C bus address of device, for devices with
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+ addresses that are configurable, e.g. by
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+ hardware links (default=0x68)
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+ mcp3421 The device is an MCP3421
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+ mcp3422 The device is an MCP3422
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+ mcp3423 The device is an MCP3423
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+ mcp3424 The device is an MCP3424
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+ mcp3425 The device is an MCP3425
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+ mcp3426 The device is an MCP3426
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+ mcp3427 The device is an MCP3427
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+ mcp3428 The device is an MCP3428
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+
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+
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Name: media-center
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Info: Media Center HAT - 2.83" Touch Display + extras by Pi Supply
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Load: dtoverlay=media-center,<param>=<val>
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/mcp342x-overlay.dts
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@@ -0,0 +1,93 @@
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+// Overlay for MCP3421-8 ADCs 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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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ status = "okay";
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+
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+ mcp342x: mcp@68 {
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+ reg = <0x68>;
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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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+ fragment@1 {
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+ target = <&mcp342x>;
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+ __dormant__ {
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+ compatible = "microchip,mcp3421";
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+ };
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+ };
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+
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+ fragment@2 {
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+ target = <&mcp342x>;
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+ __dormant__ {
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+ compatible = "microchip,mcp3422";
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+ };
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+ };
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+
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+ fragment@3 {
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+ target = <&mcp342x>;
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+ __dormant__ {
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+ compatible = "microchip,mcp3423";
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+ };
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+ };
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+
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+ fragment@4 {
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+ target = <&mcp342x>;
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+ __dormant__ {
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+ compatible = "microchip,mcp3424";
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+ };
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+ };
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+
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+ fragment@5 {
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+ target = <&mcp342x>;
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+ __dormant__ {
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+ compatible = "microchip,mcp3425";
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+ };
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+ };
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+
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+ fragment@6 {
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+ target = <&mcp342x>;
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+ __dormant__ {
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+ compatible = "microchip,mcp3426";
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+ };
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+ };
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+
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+ fragment@7 {
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+ target = <&mcp342x>;
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+ __dormant__ {
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+ compatible = "microchip,mcp3427";
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+ };
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+ };
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+
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+ fragment@8 {
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+ target = <&mcp342x>;
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+ __dormant__ {
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+ compatible = "microchip,mcp3428";
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+ };
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+ };
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+
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+ __overrides__ {
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+ addr = <&mcp342x>,"reg:0";
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+ mcp3421 = <0>,"=1";
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+ mcp3422 = <0>,"=2";
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+ mcp3423 = <0>,"=3";
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+ mcp3424 = <0>,"=4";
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+ mcp3425 = <0>,"=5";
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+ mcp3426 = <0>,"=6";
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+ mcp3427 = <0>,"=7";
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+ mcp3428 = <0>,"=8";
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+ };
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+};
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+
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