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Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0931-overlays-Add-maxtherm-overlay-for-MAX6675-31855.patch')
-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0931-overlays-Add-maxtherm-overlay-for-MAX6675-31855.patch238
1 files changed, 238 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0931-overlays-Add-maxtherm-overlay-for-MAX6675-31855.patch b/target/linux/bcm27xx/patches-5.4/950-0931-overlays-Add-maxtherm-overlay-for-MAX6675-31855.patch
new file mode 100644
index 0000000000..882cb8df5e
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0931-overlays-Add-maxtherm-overlay-for-MAX6675-31855.patch
@@ -0,0 +1,238 @@
+From 56e726d1631c9551530b8db4127352c64c3cb94d Mon Sep 17 00:00:00 2001
+From: Dougie Lawson <dl1ims@gmail.com>
+Date: Mon, 27 Jul 2020 23:52:40 +0100
+Subject: [PATCH] overlays: Add maxtherm overlay for MAX6675/31855
+
+Add an overlay - maxtherm - to support the MAX6675 and MAX31855 family
+of thermocouples.
+
+Developed from an original set of overlays by Dougie Lawson.
+
+See: https://github.com/raspberrypi/linux/pull/3763
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.com>
+---
+ arch/arm/boot/dts/overlays/Makefile | 1 +
+ arch/arm/boot/dts/overlays/README | 30 ++++
+ .../boot/dts/overlays/maxtherm-overlay.dts | 166 ++++++++++++++++++
+ 3 files changed, 197 insertions(+)
+ create mode 100644 arch/arm/boot/dts/overlays/maxtherm-overlay.dts
+
+--- a/arch/arm/boot/dts/overlays/Makefile
++++ b/arch/arm/boot/dts/overlays/Makefile
+@@ -98,6 +98,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
+ justboom-digi.dtbo \
+ ltc294x.dtbo \
+ max98357a.dtbo \
++ maxtherm.dtbo \
+ mbed-dac.dtbo \
+ mcp23017.dtbo \
+ mcp23s17.dtbo \
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -1622,6 +1622,36 @@ Params: no-sdmode Driver d
+ of the DAC (default GPIO4 if parameter omitted).
+
+
++Name: maxtherm
++Info: Configure a MAX6675 or MAX31855 thermocouple as an IIO device.
++
++ 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.
++ The overlay expects to disable the relevant spidev node, so also using
++ e.g. cs0_spidev=off is unnecessary.
++
++ Note: with the 5.7 kernel (and later) there will also be
++ overlays for MAX31855E, MAX31855J, MAX31855K,
++ MAX31885N, MAX31855R, MAX31855S and MAX31855T.
++
++ Example:
++ MAX31855 on /dev/spidev0.0
++ dtoverlay=maxtherm,spi0-0,max31855
++
++Load: dtoverlay=maxtherm,<param>=<val>
++Params: spi<n>-<m> Configure device at spi<n>, cs<m>
++ (boolean, required)
++ max6675 Enable support for the MAX6675 (default)
++ max31855 Enable support for the MAX31855
++ max31855e Enable support for the MAX31855E
++ max31855j Enable support for the MAX31855J
++ max31855k Enable support for the MAX31855K
++ max31855n Enable support for the MAX31855N
++ max31855r Enable support for the MAX31855R
++ max31855s Enable support for the MAX31855S
++ max31855t Enable support for the MAX31855T
++
++
+ Name: mbed-dac
+ Info: Configures the mbed AudioCODEC (TLV320AIC23B)
+ Load: dtoverlay=mbed-dac
+--- /dev/null
++++ b/arch/arm/boot/dts/overlays/maxtherm-overlay.dts
+@@ -0,0 +1,166 @@
++/*
++ * Universal device tree overlay for SPI devices
++ */
++
++/dts-v1/;
++/plugin/;
++
++/ {
++ compatible = "brcm,bcm2835";
++
++ 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";
++ };
++ };
++
++ maxfrag: fragment@8 {
++ target = <&spi0>;
++ __overlay__ {
++ status = "okay";
++ #address-cells = <1>;
++ #size-cells = <0>;
++
++ max: maxtherm@0 {
++ compatible = "maxim,max6675";
++ reg = <0>;
++ spi-max-frequency = <500000>;
++ };
++ };
++ };
++
++ fragment@9 {
++ target = <&max>;
++ __dormant__ {
++ compatible = "maxim,max31855e", "maxim,max31855";
++ };
++ };
++
++ fragment@10 {
++ target = <&max>;
++ __dormant__ {
++ compatible = "maxim,max31855j", "maxim,max31855";
++ };
++ };
++
++ fragment@11 {
++ target = <&max>;
++ __dormant__ {
++ compatible = "maxim,max31855k", "maxim,max31855";
++ };
++ };
++
++ fragment@12 {
++ target = <&max>;
++ __dormant__ {
++ compatible = "maxim,max31855n", "maxim,max31855";
++ };
++ };
++
++ fragment@13 {
++ target = <&max>;
++ __dormant__ {
++ compatible = "maxim,max31855r", "maxim,max31855";
++ };
++ };
++
++ fragment@14 {
++ target = <&max>;
++ __dormant__ {
++ compatible = "maxim,max31855s", "maxim,max31855";
++ };
++ };
++
++ fragment@15 {
++ target = <&max>;
++ __dormant__ {
++ compatible = "maxim,max31855t", "maxim,max31855";
++ };
++ };
++
++ __overrides__ {
++ spi0-0 = <0>, "+0",
++ <&maxfrag>,"target:0=",<&spi0>,
++ <&max>,"reg:0=0";
++ spi0-1 = <0>, "+1",
++ <&maxfrag>,"target:0=",<&spi0>,
++ <&max>,"reg:0=1";
++ spi1-0 = <0>, "+2",
++ <&maxfrag>,"target:0=",<&spi1>,
++ <&max>,"reg:0=0";
++ spi1-1 = <0>, "+3",
++ <&maxfrag>,"target:0=",<&spi1>,
++ <&max>,"reg:0=1";
++ spi1-2 = <0>, "+4",
++ <&maxfrag>,"target:0=",<&spi1>,
++ <&max>,"reg:0=2";
++ spi2-0 = <0>, "+5",
++ <&maxfrag>,"target:0=",<&spi2>,
++ <&max>,"reg:0=0";
++ spi2-1 = <0>, "+6",
++ <&maxfrag>,"target:0=",<&spi2>,
++ <&max>,"reg:0=1";
++ spi2-2 = <0>, "+7",
++ <&maxfrag>,"target:0=",<&spi2>,
++ <&max>,"reg:0=2";
++ max6675 = <&max>,"compatible=maxim,max6675";
++ max31855 = <&max>,"compatible=maxim,max31855";
++ max31855e = <0>,"+9";
++ max31855j = <0>,"+10";
++ max31855k = <0>,"+11";
++ max31855n = <0>,"+12";
++ max31855r = <0>,"+13";
++ max31855s = <0>,"+14";
++ max31855t = <0>,"+15";
++ };
++};
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