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62b7f5931c
bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry-picked from commit f07e572f64)
239 lines
5.7 KiB
Diff
239 lines
5.7 KiB
Diff
From 56e726d1631c9551530b8db4127352c64c3cb94d Mon Sep 17 00:00:00 2001
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From: Dougie Lawson <dl1ims@gmail.com>
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Date: Mon, 27 Jul 2020 23:52:40 +0100
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Subject: [PATCH] overlays: Add maxtherm overlay for MAX6675/31855
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Add an overlay - maxtherm - to support the MAX6675 and MAX31855 family
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of thermocouples.
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Developed from an original set of overlays by Dougie Lawson.
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See: https://github.com/raspberrypi/linux/pull/3763
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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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 | 30 ++++
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.../boot/dts/overlays/maxtherm-overlay.dts | 166 ++++++++++++++++++
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3 files changed, 197 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/maxtherm-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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@@ -98,6 +98,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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justboom-digi.dtbo \
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ltc294x.dtbo \
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max98357a.dtbo \
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+ maxtherm.dtbo \
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mbed-dac.dtbo \
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mcp23017.dtbo \
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mcp23s17.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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@@ -1622,6 +1622,36 @@ Params: no-sdmode Driver d
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of the DAC (default GPIO4 if parameter omitted).
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+Name: maxtherm
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+Info: Configure a MAX6675 or MAX31855 thermocouple as an IIO device.
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+
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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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+ The overlay expects to disable the relevant spidev node, so also using
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+ e.g. cs0_spidev=off is unnecessary.
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+
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+ Note: with the 5.7 kernel (and later) there will also be
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+ overlays for MAX31855E, MAX31855J, MAX31855K,
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+ MAX31885N, MAX31855R, MAX31855S and MAX31855T.
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+
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+ Example:
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+ MAX31855 on /dev/spidev0.0
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+ dtoverlay=maxtherm,spi0-0,max31855
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+
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+Load: dtoverlay=maxtherm,<param>=<val>
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+Params: spi<n>-<m> Configure device at spi<n>, cs<m>
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+ (boolean, required)
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+ max6675 Enable support for the MAX6675 (default)
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+ max31855 Enable support for the MAX31855
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+ max31855e Enable support for the MAX31855E
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+ max31855j Enable support for the MAX31855J
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+ max31855k Enable support for the MAX31855K
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+ max31855n Enable support for the MAX31855N
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+ max31855r Enable support for the MAX31855R
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+ max31855s Enable support for the MAX31855S
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+ max31855t Enable support for the MAX31855T
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+
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+
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Name: mbed-dac
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Info: Configures the mbed AudioCODEC (TLV320AIC23B)
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Load: dtoverlay=mbed-dac
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/maxtherm-overlay.dts
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@@ -0,0 +1,166 @@
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+/*
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+ * Universal device tree overlay for SPI devices
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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";
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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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+ maxfrag: fragment@8 {
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+ target = <&spi0>;
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+ __overlay__ {
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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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+ max: maxtherm@0 {
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+ compatible = "maxim,max6675";
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+ reg = <0>;
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+ spi-max-frequency = <500000>;
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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 = <&max>;
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+ __dormant__ {
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+ compatible = "maxim,max31855e", "maxim,max31855";
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+ };
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+ };
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+
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+ fragment@10 {
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+ target = <&max>;
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+ __dormant__ {
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+ compatible = "maxim,max31855j", "maxim,max31855";
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+ };
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+ };
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+
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+ fragment@11 {
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+ target = <&max>;
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+ __dormant__ {
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+ compatible = "maxim,max31855k", "maxim,max31855";
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+ };
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+ };
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+
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+ fragment@12 {
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+ target = <&max>;
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+ __dormant__ {
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+ compatible = "maxim,max31855n", "maxim,max31855";
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+ };
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+ };
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+
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+ fragment@13 {
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+ target = <&max>;
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+ __dormant__ {
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+ compatible = "maxim,max31855r", "maxim,max31855";
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+ };
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+ };
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+
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+ fragment@14 {
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+ target = <&max>;
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+ __dormant__ {
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+ compatible = "maxim,max31855s", "maxim,max31855";
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+ };
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+ };
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+
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+ fragment@15 {
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+ target = <&max>;
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+ __dormant__ {
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+ compatible = "maxim,max31855t", "maxim,max31855";
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+ };
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+ };
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+
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+ __overrides__ {
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+ spi0-0 = <0>, "+0",
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+ <&maxfrag>,"target:0=",<&spi0>,
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+ <&max>,"reg:0=0";
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+ spi0-1 = <0>, "+1",
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+ <&maxfrag>,"target:0=",<&spi0>,
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+ <&max>,"reg:0=1";
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+ spi1-0 = <0>, "+2",
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+ <&maxfrag>,"target:0=",<&spi1>,
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+ <&max>,"reg:0=0";
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+ spi1-1 = <0>, "+3",
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+ <&maxfrag>,"target:0=",<&spi1>,
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+ <&max>,"reg:0=1";
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+ spi1-2 = <0>, "+4",
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+ <&maxfrag>,"target:0=",<&spi1>,
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+ <&max>,"reg:0=2";
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+ spi2-0 = <0>, "+5",
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+ <&maxfrag>,"target:0=",<&spi2>,
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+ <&max>,"reg:0=0";
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+ spi2-1 = <0>, "+6",
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+ <&maxfrag>,"target:0=",<&spi2>,
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+ <&max>,"reg:0=1";
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+ spi2-2 = <0>, "+7",
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+ <&maxfrag>,"target:0=",<&spi2>,
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+ <&max>,"reg:0=2";
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+ max6675 = <&max>,"compatible=maxim,max6675";
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+ max31855 = <&max>,"compatible=maxim,max31855";
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+ max31855e = <0>,"+9";
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+ max31855j = <0>,"+10";
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+ max31855k = <0>,"+11";
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+ max31855n = <0>,"+12";
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+ max31855r = <0>,"+13";
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+ max31855s = <0>,"+14";
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+ max31855t = <0>,"+15";
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+ };
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+};
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