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