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From 33800ba2a14ff23db96fe5ea6e421a731f60c52b Mon Sep 17 00:00:00 2001
From: Scott Ellis <scott@jumpnowtek.com>
Date: Fri, 27 Jan 2017 06:42:42 -0500
Subject: [PATCH] Add overlay for mcp3008 adc (#1818)
Some example usage:
SPI0.0
dtparam=spi=on
dtoverlay=mcp3008:spi0-0-present
SPI0.1
dtparam=spi=on
dtoverlay=mcp3008:spi0-1-present
SPI0.0 and SPI0.1
dtparam=spi=on
dtoverlay=mcp3008:spi0-0-present,spi0-1-present
SPI1.0
dtparam=spi=on
dtoverlay=spi1-1cs
dtoverlay=mcp3008:spi1-0-present
SPI1.2
dtparam=spi=on
dtoverlay=spi1-1cs:cs0_pin=16
dtoverlay=mcp3008:spi1-0-present
SPI1.0 and SPI1.1
dtoverlay=spi1-2cs
dtoverlay=mcp3008:spi1-0-present,spi1-1-present
Changing the speed
SPI0.0
dtparam=spi=on
dtoverlay=mcp3008:spi0-0-present,spi0-0-speed=2000000
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 9 ++
arch/arm/boot/dts/overlays/mcp3008-overlay.dts | 205 +++++++++++++++++++++++++
3 files changed, 215 insertions(+)
create mode 100755 arch/arm/boot/dts/overlays/mcp3008-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -47,6 +47,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
mcp23s17.dtbo \
mcp2515-can0.dtbo \
mcp2515-can1.dtbo \
+ mcp3008.dtbo \
midi-uart0.dtbo \
mmc.dtbo \
mz61581.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -742,6 +742,15 @@ Params: oscillator Clock fr
interrupt GPIO for interrupt signal
+Name: mcp3008
+Info: Configures MCP3008 A/D converters
+ For devices on spi1 or spi2, the interfaces should be enabled
+ with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
+Load: dtoverlay=mcp3008,<param>[=<val>]
+Params: spi<n>-<m>-present boolean, configure device at spi<n>, cs<m>
+ spi<n>-<m>-speed integer, set the spi bus speed for this device
+
+
Name: midi-uart0
Info: Configures UART0 (ttyAMA0) so that a requested 38.4kbaud actually gets
31.25kbaud, the frequency required for MIDI
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/mcp3008-overlay.dts
@@ -0,0 +1,205 @@
+/*
+ * Device tree overlay for Microchip mcp3008 10-Bit A/D Converters
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
+
+ fragment@0 {
+ target = <&spidev0>;
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@1 {
+ target = <&spidev1>;
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@2 {
+ target-path = "spi1/spidev@0";
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@3 {
+ target-path = "spi1/spidev@1";
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@4 {
+ target-path = "spi1/spidev@2";
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@5 {
+ target-path = "spi2/spidev@0";
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@6 {
+ target-path = "spi2/spidev@1";
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@7 {
+ target-path = "spi2/spidev@2";
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@8 {
+ target = <&spi0>;
+ __dormant__ {
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mcp3008_00: mcp3008@0 {
+ compatible = "mcp3008";
+ reg = <0>;
+ spi-max-frequency = <1600000>;
+ };
+ };
+ };
+
+ fragment@9 {
+ target = <&spi0>;
+ __dormant__ {
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mcp3008_01: mcp3008@1 {
+ compatible = "mcp3008";
+ reg = <1>;
+ spi-max-frequency = <1600000>;
+ };
+ };
+ };
+
+ fragment@10 {
+ target = <&spi1>;
+ __dormant__ {
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mcp3008_10: mcp3008@0 {
+ compatible = "mcp3008";
+ reg = <0>;
+ spi-max-frequency = <1600000>;
+ };
+ };
+ };
+
+ fragment@11 {
+ target = <&spi1>;
+ __dormant__ {
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mcp3008_11: mcp3008@1 {
+ compatible = "mcp3008";
+ reg = <1>;
+ spi-max-frequency = <1600000>;
+ };
+ };
+ };
+
+ fragment@12 {
+ target = <&spi1>;
+ __dormant__ {
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mcp3008_12: mcp3008@2 {
+ compatible = "mcp3008";
+ reg = <2>;
+ spi-max-frequency = <1600000>;
+ };
+ };
+ };
+
+ fragment@13 {
+ target = <&spi2>;
+ __dormant__ {
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mcp3008_20: mcp3008@0 {
+ compatible = "mcp3008";
+ reg = <0>;
+ spi-max-frequency = <1600000>;
+ };
+ };
+ };
+
+ fragment@14 {
+ target = <&spi2>;
+ __dormant__ {
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mcp3008_21: mcp3008@1 {
+ compatible = "mcp3008";
+ reg = <1>;
+ spi-max-frequency = <1600000>;
+ };
+ };
+ };
+
+ fragment@15 {
+ target = <&spi2>;
+ __dormant__ {
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mcp3008_22: mcp3008@2 {
+ compatible = "mcp3008";
+ reg = <2>;
+ spi-max-frequency = <1600000>;
+ };
+ };
+ };
+
+ __overrides__ {
+ spi0-0-present = <0>, "+0+8";
+ spi0-1-present = <0>, "+1+9";
+ spi1-0-present = <0>, "+2+10";
+ spi1-1-present = <0>, "+3+11";
+ spi1-2-present = <0>, "+4+12";
+ spi2-0-present = <0>, "+5+13";
+ spi2-1-present = <0>, "+6+14";
+ spi2-2-present = <0>, "+7+15";
+ spi0-0-speed = <&mcp3008_00>, "spi-max-frequency:0";
+ spi0-1-speed = <&mcp3008_01>, "spi-max-frequency:0";
+ spi1-0-speed = <&mcp3008_10>, "spi-max-frequency:0";
+ spi1-1-speed = <&mcp3008_11>, "spi-max-frequency:0";
+ spi1-2-speed = <&mcp3008_12>, "spi-max-frequency:0";
+ spi2-0-speed = <&mcp3008_20>, "spi-max-frequency:0";
+ spi2-1-speed = <&mcp3008_21>, "spi-max-frequency:0";
+ spi2-2-speed = <&mcp3008_22>, "spi-max-frequency:0";
+ };
+};
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