bcm27xx: import latest patches from the RPi foundation

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)

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";
++	};
++};