+++ /dev/null
-From 9444edfa8b5b18f8727b82853dd50345a400a316 Mon Sep 17 00:00:00 2001
-From: Phil Elwell <phil@raspberrypi.com>
-Date: Thu, 22 Oct 2020 17:11:12 +0100
-Subject: [PATCH] overlays: Add MAX31856 support to maxtherm overlay
-
-Extend the maxtherm overlay with support for the MAX31856.
-The driver reads the thermocouple type from a property, which is much
-more civilised.
-
-See: https://github.com/raspberrypi/linux/issues/3915
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.com>
----
- arch/arm/boot/dts/overlays/README | 18 ++++++++++++-----
- .../boot/dts/overlays/maxtherm-overlay.dts | 20 +++++++++++++++++++
- 2 files changed, 33 insertions(+), 5 deletions(-)
-
---- a/arch/arm/boot/dts/overlays/README
-+++ b/arch/arm/boot/dts/overlays/README
-@@ -1666,20 +1666,19 @@ Params: no-sdmode Driver d
-
-
- Name: maxtherm
--Info: Configure a MAX6675 or MAX31855 thermocouple as an IIO device.
-+Info: Configure a MAX6675, MAX31855 or MAX31856 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
-+ MAX31856 using a type J thermocouple on /dev/spidev2.1
-+ dtoverlay=spi2-2cs
-+ dtoverlay=maxtherm,spi2-1,max31856,type_j
-
- Load: dtoverlay=maxtherm,<param>=<val>
- Params: spi<n>-<m> Configure device at spi<n>, cs<m>
-@@ -1693,6 +1692,15 @@ Params: spi<n>-<m> Configur
- max31855r Enable support for the MAX31855R
- max31855s Enable support for the MAX31855S
- max31855t Enable support for the MAX31855T
-+ max31856 Enable support for the MAX31856 (with type K)
-+ type_b Select a type B sensor for max31856
-+ type_e Select a type E sensor for max31856
-+ type_j Select a type J sensor for max31856
-+ type_k Select a type K sensor for max31856
-+ type_n Select a type N sensor for max31856
-+ type_r Select a type R sensor for max31856
-+ type_s Select a type S sensor for max31856
-+ type_t Select a type T sensor for max31856
-
-
- Name: mbed-dac
---- a/arch/arm/boot/dts/overlays/maxtherm-overlay.dts
-+++ b/arch/arm/boot/dts/overlays/maxtherm-overlay.dts
-@@ -5,6 +5,8 @@
- /dts-v1/;
- /plugin/;
-
-+#include <dt-bindings/iio/temperature/thermocouple.h>
-+
- / {
- compatible = "brcm,bcm2835";
-
-@@ -128,6 +130,15 @@
- };
- };
-
-+ fragment@16 {
-+ target = <&max>;
-+ __dormant__ {
-+ compatible = "maxim,max31856";
-+ spi-cpha;
-+ thermocouple-type = <THERMOCOUPLE_TYPE_K>;
-+ };
-+ };
-+
- __overrides__ {
- spi0-0 = <0>, "+0",
- <&maxfrag>,"target:0=",<&spi0>,
-@@ -162,5 +173,14 @@
- max31855r = <0>,"+13";
- max31855s = <0>,"+14";
- max31855t = <0>,"+15";
-+ max31856 = <0>,"+16";
-+ type_b = <&max>,"thermocouple-type:0=",<THERMOCOUPLE_TYPE_B>;
-+ type_e = <&max>,"thermocouple-type:0=",<THERMOCOUPLE_TYPE_E>;
-+ type_j = <&max>,"thermocouple-type:0=",<THERMOCOUPLE_TYPE_J>;
-+ type_k = <&max>,"thermocouple-type:0=",<THERMOCOUPLE_TYPE_K>;
-+ type_n = <&max>,"thermocouple-type:0=",<THERMOCOUPLE_TYPE_N>;
-+ type_r = <&max>,"thermocouple-type:0=",<THERMOCOUPLE_TYPE_R>;
-+ type_s = <&max>,"thermocouple-type:0=",<THERMOCOUPLE_TYPE_S>;
-+ type_t = <&max>,"thermocouple-type:0=",<THERMOCOUPLE_TYPE_T>;
- };
- };