[PATCH v2 3/3] arm64: dts: broadcom: rpi-5: Add RP1 PWM node

Andrea della Porta
2026-04-10T14:07:08Z

From: Stanimir Varbanov <svarbanov@suse.de>

The RP1 chipset used on the Raspberry Pi 5 features an integrated
PWM controller to drive the cooling fan.

Add the corresponding DT node for this PWM controller.

Signed-off-by: Stanimir Varbanov <svarbanov@suse.de>
Co-developed-by: Andrea della Porta <andrea.porta@suse.com>
Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
---
arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts | 12 ++++++++++++
arch/arm64/boot/dts/broadcom/rp1-common.dtsi | 10 ++++++++++
2 files changed, 22 insertions(+)

diff --git a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
index 2856082814462..a4e5ba23bf536 100644
--- a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
+++ b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
@@ -64,12 +64,24 @@ phy1: ethernet-phy@1 {
};

&rp1_gpio {
+ fan_pwm_default_state: fan-pwm-default-state {
+ function = "pwm1";
+ pins = "gpio45";
+ bias-pull-down;
+ };
+
usb_vbus_default_state: usb-vbus-default-state {
function = "vbus1";
groups = "vbus1";
};
};

+&rp1_pwm {
+ pinctrl-0 = <&fan_pwm_default_state>;
+ pinctrl-names = "default";
+ status = "okay";
+};
+
&rp1_usb0 {
pinctrl-0 = <&usb_vbus_default_state>;
pinctrl-names = "default";
diff --git a/arch/arm64/boot/dts/broadcom/rp1-common.dtsi b/arch/arm64/boot/dts/broadcom/rp1-common.dtsi
index 5a815c3797945..d0f4d6be75500 100644
--- a/arch/arm64/boot/dts/broadcom/rp1-common.dtsi
+++ b/arch/arm64/boot/dts/broadcom/rp1-common.dtsi
@@ -26,6 +26,16 @@ rp1_clocks: clocks@40018000 {
<200000000>; // RP1_CLK_SYS
};

+ rp1_pwm: pwm@4009c000 {
+ compatible = "raspberrypi,rp1-pwm";
+ reg = <0x00 0x4009c000 0x0 0x100>;
+ clocks = <&rp1_clocks RP1_CLK_PWM1>;
+ assigned-clocks = <&rp1_clocks RP1_CLK_PWM1>;
+ assigned-clock-rates = <50000000>;
+ #pwm-cells = <3>;
+ status = "disabled";
+ };
+
rp1_gpio: pinctrl@400d0000 {
compatible = "raspberrypi,rp1-gpio";
reg = <0x00 0x400d0000 0x0 0xc000>,
--
2.35.3