[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-Id: <20251007084028.1125185-2-primoz.fiser@norik.com>
Date: Tue, 7 Oct 2025 10:40:28 +0200
From: Primoz Fiser <primoz.fiser@...ik.com>
To: Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>
Cc: imx@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
upstream@...ts.phytec.de
Subject: [PATCH 2/2] arm64: dts: freescale: imx93-phyboard-nash: Add pwm-fan overlay
Add overlay to support PWM fan on the phyBOARD-Nash-i.MX93 board. Fan
can be connected to the FAN (X48) connector on the board and will be
controlled according to the following CPU temperature trips table:
- bellow 50 degrees - fan is off (<1% duty cycle)
- between 50 and 58 degrees - low fan speed (~35% duty cycle)
- between 58 and 65 degrees - fan medium speed (~60% duty cycle)
- above 65 degrees - fan at full speed (>99% duty cycle)
The output frequency of PWM signal is set to 25 kHz.
Signed-off-by: Primoz Fiser <primoz.fiser@...ik.com>
---
arch/arm64/boot/dts/freescale/Makefile | 2 +
.../imx93-phyboard-nash-pwm-fan.dtso | 75 +++++++++++++++++++
2 files changed, 77 insertions(+)
create mode 100644 arch/arm64/boot/dts/freescale/imx93-phyboard-nash-pwm-fan.dtso
diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index c72a6fdc5412..9807eb878916 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -358,11 +358,13 @@ dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-segin.dtb
imx93-phyboard-nash-jtag-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-nash-jtag.dtbo
imx93-phyboard-nash-peb-wlbt-07-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-nash-peb-wlbt-07.dtbo
+imx93-phyboard-nash-pwm-fan-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-nash-pwm-fan.dtbo
imx93-phyboard-segin-peb-eval-01-dtbs += imx93-phyboard-segin.dtb imx93-phyboard-segin-peb-eval-01.dtbo
imx93-phyboard-segin-peb-wlbt-05-dtbs += imx93-phyboard-segin.dtb imx93-phyboard-segin-peb-wlbt-05.dtbo
imx93-phycore-rpmsg-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-segin.dtb imx93-phycore-rpmsg.dtbo
dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-nash-jtag.dtb
dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-nash-peb-wlbt-07.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-nash-pwm-fan.dtb
dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-segin-peb-eval-01.dtb
dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-segin-peb-wlbt-05.dtb
dtb-$(CONFIG_ARCH_MXC) += imx93-phycore-rpmsg.dtb
diff --git a/arch/arm64/boot/dts/freescale/imx93-phyboard-nash-pwm-fan.dtso b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash-pwm-fan.dtso
new file mode 100644
index 000000000000..d1adf04d56d9
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash-pwm-fan.dtso
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2025 PHYTEC Messtechnik GmbH
+ * Author: Primoz Fiser <primoz.fiser@...ik.com>
+ */
+
+#include <dt-bindings/pwm/pwm.h>
+#include "imx93-pinfunc.h"
+
+/dts-v1/;
+/plugin/;
+
+&{/} {
+ fan0: pwm-fan {
+ compatible = "pwm-fan";
+ #cooling-cells = <2>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_fan>;
+ cooling-levels = <1 90 150 200 255>;
+ pwms = <&tpm6 1 40000 PWM_POLARITY_INVERTED>;
+ };
+
+ thermal-zones {
+ cpu-thermal {
+ trips {
+ cpu_low: cpu-low {
+ hysteresis = <3000>;
+ temperature = <50000>;
+ type = "active";
+ };
+
+ cpu_med: cpu-med {
+ hysteresis = <3000>;
+ temperature = <58000>;
+ type = "active";
+ };
+
+ cpu_high: cpu-high {
+ hysteresis = <3000>;
+ temperature = <65000>;
+ type = "active";
+ };
+ };
+
+ cooling-maps {
+ map1 {
+ cooling-device = <&fan0 1 1>;
+ trip = <&cpu_low>;
+ };
+
+ map2 {
+ cooling-device = <&fan0 2 2>;
+ trip = <&cpu_med>;
+ };
+
+ map3 {
+ cooling-device = <&fan0 4 4>;
+ trip = <&cpu_high>;
+ };
+ };
+ };
+ };
+};
+
+&tpm6 {
+ status = "okay";
+};
+
+&iomuxc {
+ pinctrl_fan: fangrp {
+ fsl,pins = <
+ MX93_PAD_GPIO_IO23__TPM6_CH1 0x31e
+ >;
+ };
+};
--
2.34.1
Powered by blists - more mailing lists