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282 lines
5.9 KiB
Diff
282 lines
5.9 KiB
Diff
From f6a9afad8ed6521991c138caf7f20fd5222c2a5a Mon Sep 17 00:00:00 2001
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From: Scott Ellis <scott@jumpnowtek.com>
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Date: Fri, 27 Jan 2017 06:42:42 -0500
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Subject: [PATCH] Add overlay for mcp3008 adc (#1818)
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Some example usage:
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SPI0.0
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dtparam=spi=on
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dtoverlay=mcp3008:spi0-0-present
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SPI0.1
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dtparam=spi=on
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dtoverlay=mcp3008:spi0-1-present
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SPI0.0 and SPI0.1
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dtparam=spi=on
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dtoverlay=mcp3008:spi0-0-present,spi0-1-present
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SPI1.0
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dtparam=spi=on
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dtoverlay=spi1-1cs
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dtoverlay=mcp3008:spi1-0-present
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SPI1.2
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dtparam=spi=on
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dtoverlay=spi1-1cs:cs0_pin=16
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dtoverlay=mcp3008:spi1-0-present
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SPI1.0 and SPI1.1
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dtoverlay=spi1-2cs
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dtoverlay=mcp3008:spi1-0-present,spi1-1-present
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Changing the speed
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SPI0.0
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dtparam=spi=on
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dtoverlay=mcp3008:spi0-0-present,spi0-0-speed=2000000
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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 | 9 ++
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arch/arm/boot/dts/overlays/mcp3008-overlay.dts | 205 +++++++++++++++++++++++++
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3 files changed, 215 insertions(+)
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create mode 100755 arch/arm/boot/dts/overlays/mcp3008-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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@@ -57,6 +57,7 @@ dtbo-$(RPI_DT_OVERLAYS) += mcp23017.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += mcp23s17.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += mcp2515-can0.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += mcp2515-can1.dtbo
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+dtbo-$(RPI_DT_OVERLAYS) += mcp3008.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += mmc.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += mz61581.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += pi3-act-led.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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@@ -736,6 +736,15 @@ Params: oscillator Clock fr
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interrupt GPIO for interrupt signal
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+Name: mcp3008
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+Info: Configures MCP3008 A/D converters
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+ For devices on spi1 or spi2, the interfaces should be enabled
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+ with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
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+Load: dtoverlay=mcp3008,<param>[=<val>]
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+Params: spi<n>-<m>-present boolean, configure device at spi<n>, cs<m>
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+ spi<n>-<m>-speed integer, set the spi bus speed for this device
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+
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+
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Name: mmc
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Info: Selects the bcm2835-mmc SD/MMC driver, optionally with overclock
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Load: dtoverlay=mmc,<param>=<val>
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/mcp3008-overlay.dts
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@@ -0,0 +1,205 @@
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+/*
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+ * Device tree overlay for Microchip mcp3008 10-Bit A/D Converters
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+ */
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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 = <&spidev0>;
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+ __dormant__ {
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+ status = "disabled";
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&spidev1>;
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+ __dormant__ {
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+ status = "disabled";
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+ };
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+ };
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+
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+ fragment@2 {
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+ target-path = "spi1/spidev@0";
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+ __dormant__ {
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+ status = "disabled";
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+ };
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+ };
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+
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+ fragment@3 {
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+ target-path = "spi1/spidev@1";
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+ __dormant__ {
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+ status = "disabled";
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+ };
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+ };
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+
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+ fragment@4 {
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+ target-path = "spi1/spidev@2";
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+ __dormant__ {
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+ status = "disabled";
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+ };
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+ };
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+
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+ fragment@5 {
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+ target-path = "spi2/spidev@0";
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+ __dormant__ {
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+ status = "disabled";
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+ };
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+ };
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+
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+ fragment@6 {
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+ target-path = "spi2/spidev@1";
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+ __dormant__ {
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+ status = "disabled";
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+ };
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+ };
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+
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+ fragment@7 {
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+ target-path = "spi2/spidev@2";
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+ __dormant__ {
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+ status = "disabled";
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+ };
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+ };
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+
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+ fragment@8 {
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+ target = <&spi0>;
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+ __dormant__ {
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ mcp3008_00: mcp3008@0 {
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+ compatible = "mcp3008";
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+ reg = <0>;
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+ spi-max-frequency = <1600000>;
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+ };
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+ };
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+ };
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+
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+ fragment@9 {
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+ target = <&spi0>;
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+ __dormant__ {
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ mcp3008_01: mcp3008@1 {
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+ compatible = "mcp3008";
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+ reg = <1>;
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+ spi-max-frequency = <1600000>;
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+ };
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+ };
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+ };
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+
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+ fragment@10 {
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+ target = <&spi1>;
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+ __dormant__ {
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ mcp3008_10: mcp3008@0 {
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+ compatible = "mcp3008";
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+ reg = <0>;
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+ spi-max-frequency = <1600000>;
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+ };
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+ };
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+ };
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+
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+ fragment@11 {
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+ target = <&spi1>;
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+ __dormant__ {
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ mcp3008_11: mcp3008@1 {
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+ compatible = "mcp3008";
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+ reg = <1>;
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+ spi-max-frequency = <1600000>;
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+ };
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+ };
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+ };
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+
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+ fragment@12 {
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+ target = <&spi1>;
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+ __dormant__ {
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ mcp3008_12: mcp3008@2 {
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+ compatible = "mcp3008";
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+ reg = <2>;
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+ spi-max-frequency = <1600000>;
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+ };
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+ };
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+ };
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+
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+ fragment@13 {
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+ target = <&spi2>;
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+ __dormant__ {
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ mcp3008_20: mcp3008@0 {
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+ compatible = "mcp3008";
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+ reg = <0>;
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+ spi-max-frequency = <1600000>;
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+ };
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+ };
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+ };
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+
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+ fragment@14 {
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+ target = <&spi2>;
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+ __dormant__ {
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ mcp3008_21: mcp3008@1 {
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+ compatible = "mcp3008";
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+ reg = <1>;
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+ spi-max-frequency = <1600000>;
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+ };
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+ };
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+ };
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+
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+ fragment@15 {
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+ target = <&spi2>;
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+ __dormant__ {
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ mcp3008_22: mcp3008@2 {
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+ compatible = "mcp3008";
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+ reg = <2>;
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+ spi-max-frequency = <1600000>;
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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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+ spi0-0-present = <0>, "+0+8";
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+ spi0-1-present = <0>, "+1+9";
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+ spi1-0-present = <0>, "+2+10";
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+ spi1-1-present = <0>, "+3+11";
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+ spi1-2-present = <0>, "+4+12";
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+ spi2-0-present = <0>, "+5+13";
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+ spi2-1-present = <0>, "+6+14";
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+ spi2-2-present = <0>, "+7+15";
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+ spi0-0-speed = <&mcp3008_00>, "spi-max-frequency:0";
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+ spi0-1-speed = <&mcp3008_01>, "spi-max-frequency:0";
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+ spi1-0-speed = <&mcp3008_10>, "spi-max-frequency:0";
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+ spi1-1-speed = <&mcp3008_11>, "spi-max-frequency:0";
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+ spi1-2-speed = <&mcp3008_12>, "spi-max-frequency:0";
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+ spi2-0-speed = <&mcp3008_20>, "spi-max-frequency:0";
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+ spi2-1-speed = <&mcp3008_21>, "spi-max-frequency:0";
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+ spi2-2-speed = <&mcp3008_22>, "spi-max-frequency:0";
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+ };
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+};
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