bcm27xx: add support for linux v5.15

Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 165 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0893-dtoverlays-Add-i2c-fan-overlay.patch b/target/linux/bcm27xx/patches-5.15/950-0893-dtoverlays-Add-i2c-fan-overlay.patch
new file mode 100644
index 0000000000..6687eacef5
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0893-dtoverlays-Add-i2c-fan-overlay.patch
@@ -0,0 +1,165 @@
+From 4bf62f8dc97e24dadda64762ab47c299ac6eb8cb Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.com>
+Date: Tue, 3 May 2022 17:20:11 +0100
+Subject: [PATCH] dtoverlays: Add i2c-fan overlay
+
+Add an i2c-fan overlay, initially with support for the EMC2301
+fan controller found on the CM4IO board.
+Based on the overlay from Traverse Technologies, but modified for
+the EMC2305 driver submitted to linux-hwmon.
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.com>
+---
+ arch/arm/boot/dts/overlays/Makefile           |  1 +
+ arch/arm/boot/dts/overlays/README             | 33 +++++++
+ .../arm/boot/dts/overlays/i2c-fan-overlay.dts | 92 +++++++++++++++++++
+ 3 files changed, 126 insertions(+)
+ create mode 100644 arch/arm/boot/dts/overlays/i2c-fan-overlay.dts
+
+--- a/arch/arm/boot/dts/overlays/Makefile
++++ b/arch/arm/boot/dts/overlays/Makefile
+@@ -85,6 +85,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
+ 	hy28b-2017.dtbo \
+ 	i-sabre-q2m.dtbo \
+ 	i2c-bcm2708.dtbo \
++	i2c-fan.dtbo \
+ 	i2c-gpio.dtbo \
+ 	i2c-mux.dtbo \
+ 	i2c-pwm-pca9685a.dtbo \
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -1530,6 +1530,39 @@ Load:   dtoverlay=i2c-bcm2708
+ Params: <None>
+ 
+ 
++Name:   i2c-fan
++Info:   Adds support for a number of I2C fan controllers
++Load:   dtoverlay=i2c-fan,<param>=<val>
++Params: addr                    Sets the address for the fan controller. Note
++                                that the device must be configured to use the
++                                specified address.
++
++        i2c0                    Choose the I2C0 bus on GPIOs 0&1
++
++        i2c_csi_dsi             Choose the I2C0 bus on GPIOs 44&45
++
++        minpwm                  PWM setting for the fan when the SoC is below
++                                mintemp (range 0-255. default 0)
++        maxpwm                  PWM setting for the fan when the SoC is above
++                                maxtemp (range 0-255. default 255)
++        midtemp                 Temperature (in millicelcius) at which the fan
++                                begins to speed up (default 50000)
++
++        midtemp_hyst            Temperature delta (in millicelcius) below
++                                mintemp at which the fan will drop to minrpm
++                                (default 2000)
++
++        maxtemp                 Temperature (in millicelcius) at which the fan
++                                will be held at maxrpm (default 70000)
++
++        maxtemp_hyst            Temperature delta (in millicelcius) below
++                                maxtemp at which the fan begins to slow down
++                                (default 2000)
++
++        emc2301                 Select the Microchip EMC230x controller family
++                                - EMC2301, EMC2302, EMC2303, EMC2305.
++
++
+ Name:   i2c-gpio
+ Info:   Adds support for software i2c controller on gpio pins
+ Load:   dtoverlay=i2c-gpio,<param>=<val>
+--- /dev/null
++++ b/arch/arm/boot/dts/overlays/i2c-fan-overlay.dts
+@@ -0,0 +1,92 @@
++// Definitions for I2C based sensors using the Industrial IO or HWMON interface.
++/dts-v1/;
++/plugin/;
++
++#include <dt-bindings/thermal/thermal.h>
++
++/ {
++	compatible = "brcm,bcm2835";
++
++	fragment@0 {
++		target = <&i2cbus>;
++		__dormant__ {
++			#address-cells = <1>;
++			#size-cells = <0>;
++			status = "okay";
++
++			emc2301: emc2301@2f {
++				compatible = "microchip,emc2301";
++				reg = <0x2f>;
++				status = "okay";
++				#cooling-cells = <0x02>;
++			};
++		};
++	};
++
++	frag100: fragment@100 {
++		target = <&i2c_arm>;
++		i2cbus: __overlay__ {
++			status = "okay";
++		};
++	};
++
++	fragment@101 {
++		target = <&i2c0if>;
++		__dormant__ {
++			status = "okay";
++		};
++	};
++
++	fragment@102 {
++		target = <&i2c0mux>;
++		__dormant__ {
++			status = "okay";
++		};
++	};
++
++	fragment@103 {
++		target = <&cpu_thermal>;
++		polling-delay = <2000>; /* milliseconds */
++		__overlay__ {
++			trips {
++				fanmid0: fanmid0 {
++					temperature = <50000>;
++					hysteresis = <2000>;
++					type = "active";
++				};
++				fanmax0: fanmax0 {
++					temperature = <75000>;
++					hysteresis = <2000>;
++					type = "active";
++				};
++			};
++			cooling-maps {
++				map0: map0 {
++					trip = <&fanmid0>;
++					cooling-device = <&emc2301 2 6>;
++				};
++				map1: map1 {
++					trip = <&fanmax0>;
++					cooling-device = <&emc2301 7 THERMAL_NO_LIMIT>;
++				};
++			};
++		};
++	};
++
++	__overrides__ {
++		i2c0 =		<&frag100>,"target:0=",<&i2c0>;
++		i2c_csi_dsi =	<&frag100>,"target:0=",<&i2c_csi_dsi>,
++				<0>,"+101+102";
++		addr =		<&emc2301>,"reg:0";
++		minpwm =	<&emc2301>,"emc2305,pwm-min;0";
++		maxpwm =	<&emc2301>,"emc2305,pwm-max;0";
++		midtemp =	<&fanmid0>,"temperature:0";
++		midtemp_hyst =	<&fanmid0>,"hysteresis:0";
++		maxtemp =	<&fanmax0>,"temperature:0";
++		maxtemp_hyst =	<&fanmax0>,"hysteresis:0";
++
++		emc2301 =	<0>,"+0",
++				<&map0>,"cooling-device:0=",<&emc2301>,
++				<&map1>,"cooling-device:0=",<&emc2301>;
++	};
++};