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[79.33.140.232]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4887e9630ddsm258915625e9.13.2026.04.03.07.28.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Apr 2026 07:28:56 -0700 (PDT) From: Andrea della Porta To: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , linux-pwm@vger.kernel.org, Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Broadcom internal kernel review list , Andrea della Porta , devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Naushir Patuck , Stanimir Varbanov Subject: [PATCH 0/3] Add RP1 PWM controller support Date: Fri, 3 Apr 2026 16:31:53 +0200 Message-ID: X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This patchset adds support for the PWM controller found on the Raspberry Pi RP1 southbridge. This is necessary to operate the cooling fan connected to one of the PWM channels. The tachometer pin for the fan speed is managed by the firmware running on the RP1's M-core. It uses the PHASE2 register to report the RPM, which is then exported by this driver as a hwmon device. Subsequent patches will add the CPU thermal zone, which acts as a consumer of the PWM device. Best regards, Andrea Naushir Patuck (2): dt-bindings: pwm: Add Raspberry Pi RP1 PWM controller pwm: rp1: Add RP1 PWM controller driver Stanimir Varbanov (1): arm64: dts: broadcom: rp1: Add PWM node .../bindings/pwm/raspberrypi,rp1-pwm.yaml | 52 ++++ .../boot/dts/broadcom/bcm2712-rpi-5-b.dts | 12 + arch/arm64/boot/dts/broadcom/rp1-common.dtsi | 10 + drivers/pwm/Kconfig | 10 + drivers/pwm/Makefile | 1 + drivers/pwm/pwm-rp1.c | 244 ++++++++++++++++++ 6 files changed, 329 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/raspberrypi,rp1-pwm.yaml create mode 100644 drivers/pwm/pwm-rp1.c -- 2.35.3