251f76c1c6
Adds latest 6.6 patches from the Raspberry Pi repository. These patches were generated from: https://github.com/raspberrypi/linux/commits/rpi-6.6.y/ With the following command: git format-patch -N v6.6.83..HEAD (HEAD -> 08d4e8f52256bd422d8a1f876411603f627d0a82) Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
247 lines
8.9 KiB
Diff
247 lines
8.9 KiB
Diff
From 5fa4b1ff4db7635da04b1b8bf33b42a941064718 Mon Sep 17 00:00:00 2001
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From: Kai-Uwe Herbing <155751635+herbingk@users.noreply.github.com>
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Date: Tue, 31 Dec 2024 19:44:31 +0100
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Subject: [PATCH] Add and update files for pwm-gpio-fan overlay
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Add and update files for pwm-gpio-fan overlay
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Signed-off-by: Kai-Uwe Herbing <155751635+herbingk@users.noreply.github.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 | 40 +++++
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.../dts/overlays/pwm-gpio-fan-overlay.dts | 170 ++++++++++++++++++
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3 files changed, 211 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/pwm-gpio-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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@@ -219,6 +219,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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pwm.dtbo \
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pwm-2chan.dtbo \
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pwm-gpio.dtbo \
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+ pwm-gpio-fan.dtbo \
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pwm-ir-tx.dtbo \
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pwm-pio.dtbo \
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pwm1.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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@@ -4036,6 +4036,46 @@ Load: dtoverlay=pwm-gpio,<param>=<val>
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Params: gpio Output pin (default 4)
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+Name: pwm-gpio-fan
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+Info: Configure a GPIO connected PWM cooling fan controlled by the
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+ software-based GPIO PWM kernel module
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+Load: dtoverlay=pwm-gpio-fan,<param>=<val>
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+Params: fan_gpio BCM number of the pin driving the fan,
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+ default 18 (GPIO 18)
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+ fan_temp0 CPU temperature at which fan is started with
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+ low speed in millicelsius,
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+ default 55000 (55 °C)
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+ fan_temp1 CPU temperature at which fan is switched
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+ to medium speed in millicelsius,
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+ default 60000 (60 °C)
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+ fan_temp2 CPU temperature at which fan is switched
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+ to high speed in millicelsius,
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+ default 67500 (67.5 °C)
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+ fan_temp3 CPU temperature at which fan is switched
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+ to max speed in millicelsius,
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+ default 75000 (75 °C)
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+ fan_temp0_hyst Temperature hysteris at which fan is stopped
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+ in millicelsius,default 5000 (resulting
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+ in 50 °C)
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+ fan_temp1_hyst Temperature hysteris at which fan is switched
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+ back to low speed in millicelsius,
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+ default 5000 (resulting in 55 °C)
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+ fan_temp2_hyst Temperature hysteris at which fan is switched
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+ back to medium speed in millicelsius,
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+ default 5000 (resulting in 62.5 °C)
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+ fan_temp3_hyst Temperature hysteris at which fan is switched
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+ back to high speed in millicelsius,
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+ default 5000 (resulting in 70 °C)
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+ fan_temp0_speed Fan speed for low cooling state in range
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+ 0 to 255, default 114 (45% PWM duty cycle)
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+ fan_temp1_speed Fan speed for medium cooling state in range
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+ 0 to 255, default 152 (60% PWM duty cycle)
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+ fan_temp2_speed Fan speed for high cooling state in range
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+ 0 to 255, default 204 (80% PWM duty cycle)
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+ fan_temp3_speed Fan speed for max cooling state in range
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+ 0 to 255, default 255 (100% PWM duty cycle)
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+
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+
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Name: pwm-ir-tx
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Info: Use GPIO pin as pwm-assisted infrared transmitter output.
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This is an alternative to "gpio-ir-tx". pwm-ir-tx makes use
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/pwm-gpio-fan-overlay.dts
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@@ -0,0 +1,170 @@
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+/*
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+ * Overlay for a GPIO connected PWM cooling fan controlled by software GPIO PWM
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+ *
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+ * Optional parameters:
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+ * - "fan_gpio" BCM number of the pin driving the fan, default 18 (GPIO18)
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+ *
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+ * - "fan_temp0" CPU temperature at which fan is started with low speed in millicelsius,
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+ * default 55000 (55 °C)
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+ * - "fan_temp1" CPU temperature at which fan is switched to medium speed in millicelsius,
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+ * default 60000 (60 °C)
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+ * - "fan_temp2" CPU temperature at which fan is switched to high speed in millicelsius,
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+ * default 67500 (67.5 °C)
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+ * - "fan_temp3" CPU temperature at which fan is switched to max speed in millicelsius,
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+ * default 75000 (75 °C)
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+ * - "fan_temp0_hyst" Temperature hysteris at which fan is stopped in millicelsius,
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+ * default 5000 (resulting in 50 °C)
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+ * - "fan_temp1_hyst" Temperature hysteris at which fan is switched back to low speed
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+ * in millicelsius, default 5000 (resulting in 55 °C)
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+ * - "fan_temp2_hyst" Temperature hysteris at which fan is switched back to medium speed
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+ * in millicelsius, default 5000 (resulting in 62.5 °C)
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+ * - "fan_temp3_hyst" Temperature hysteris at which fan is switched back to high speed
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+ * in millicelsius, default 5000 (resulting in 70 °C)
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+ * - "fan_temp0_speed" Fan speed for low cooling state in range 0 to 255,
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+ * default 114 (45% PWM duty cycle)
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+ * - "fan_temp1_speed" Fan speed for medium cooling state in range 0 to 255,
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+ * default 152 (60% PWM duty cycle)
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+ * - "fan_temp2_speed" Fan speed for high cooling state in range 0 to 255,
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+ * default 204 (80% PWM duty cycle)
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+ * - "fan_temp3_speed" Fan speed for max cooling state in range 0 to 255,
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+ * default 255 (100% PWM duty cycle)
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+ *
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+ * N.B.
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+ * - Uses the software GPIO PWM kernel module instead of the Pis hardware PWMs (PWM0/PWM1).
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+ * This will allow for an undisturbed concurrent usage of the Pis analogue audio output.
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+ *
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+ * Requires:
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+ * - A PWM controlled cooling fan connected to the GPIO, such as an
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+ * Argon mini-fan, HighPi Pro Fan or Waveshare FAN-4020-PWM-5V
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+ * - Raspberry Pi OS Bookworm with kernel 6.6.62 or above
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+ *
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+ * Build:
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+ * - sudo dtc -I dts -O dtb -o /boot/firmware/overlays/pwm-gpiofan.dtbo pwm-gpiofan-overlay.dts
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+ *
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+ * Activate:
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+ * - sudo nano /boot/firmware/config.txt add "dtoverlay=pwm-gpiofan"
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+ *
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+ */
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+/dts-v1/;
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+/plugin/;
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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 = <&gpio>;
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+ __overlay__ {
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+ pwm_gpio_pins: pwm_gpio_pins {
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+ brcm,pins = <18>; /* gpio-pin = 18 */
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+ brcm,function = <1>; /* gpio function = output */
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+ brcm,pull = <0>; /* gpio pull up/down = off */
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target-path = "/";
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+ __overlay__ {
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+ pwm_gpio: pwm_gpio {
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+ compatible="pwm-gpio";
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+ #pwm-cells = <2>;
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&pwm_gpio_pins>;
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+ gpios = <&gpio 18 0>; /* gpio-pin = 18 */
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+ };
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+ };
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+ };
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+
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+ fragment@2 {
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+ target-path = "/";
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+ __overlay__ {
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+ fan0: pwm-fan {
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+ compatible = "pwm-fan";
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+ #cooling-cells = <2>;
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+ /* in ns = 20ms = 50 Hz */
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+ pwms = <&pwm_gpio 0 20000000 0>;
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+
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+ cooling-min-state = <0>;
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+ cooling-max-state = <4>;
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+ /* PWM duty cycle values in a range from 0 to 255 */
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+ /* which correspond to thermal cooling states 0 to 4 */
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+ cooling-levels = <0 114 152 204 255>;
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+ };
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+ };
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+ };
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+
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+ fragment@3 {
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+ target = <&cpu_thermal>;
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+ __overlay__ {
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+ /* in ms = poll every 2s */
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+ polling-delay = <2000>;
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+ };
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+ };
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+
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+ fragment@4 {
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+ target = <&thermal_trips>;
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+ __overlay__ {
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+ /* below temperatures in millicelsius */
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+ trip0: trip0 {
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+ temperature = <55000>; /* 55 °C */
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+ hysteresis = <5000>; /* 5 °C */
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+ type = "active";
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+ };
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+ trip1: trip1 {
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+ temperature = <60000>; /* 60 °C */
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+ hysteresis = <5000>; /* 5 °C */
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+ type = "active";
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+ };
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+ trip2: trip2 {
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+ temperature = <67500>; /* 67.5 °C */
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+ hysteresis = <5000>; /* 5 °C */
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+ type = "active";
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+ };
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+ trip3: trip3 {
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+ temperature = <75000>; /* 75 °C */
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+ hysteresis = <5000>; /* 5 °C */
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+ type = "active";
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+ };
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+ };
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+ };
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+
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+ fragment@5 {
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+ target = <&cooling_maps>;
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+ __overlay__ {
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+ map0 {
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+ cooling-device = <&fan0 0 1>;
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+ trip = <&trip0>;
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+ };
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+ map1 {
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+ cooling-device = <&fan0 1 2>;
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+ trip = <&trip1>;
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+ };
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+ map2 {
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+ cooling-device = <&fan0 2 3>;
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+ trip = <&trip2>;
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+ };
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+ map3 {
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+ cooling-device = <&fan0 3 4>;
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+ trip = <&trip3>;
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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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+ fan_gpio = <&pwm_gpio>,"gpios:4",
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+ <&pwm_gpio_pins>,"brcm,pins:0";
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+ fan_temp0 = <&trip0>,"temperature:0";
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+ fan_temp0_hyst = <&trip0>,"hysteresis:0";
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+ fan_temp0_speed = <&fan0>,"cooling-levels:4";
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+ fan_temp1 = <&trip1>,"temperature:0";
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+ fan_temp1_hyst = <&trip1>,"hysteresis:0";
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+ fan_temp1_speed = <&fan0>,"cooling-levels:8";
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+ fan_temp2 = <&trip2>,"temperature:0";
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+ fan_temp2_hyst = <&trip2>,"hysteresis:0";
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+ fan_temp2_speed = <&fan0>,"cooling-levels:12";
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+ fan_temp3 = <&trip3>,"temperature:0";
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+ fan_temp3_hyst = <&trip3>,"hysteresis:0";
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+ fan_temp3_speed = <&fan0>,"cooling-levels:16";
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+ };
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+
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+};
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