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Fri, 12 Jun 2026 06:58:13 -0700 (PDT) Received: from localhost ([195.94.146.6]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-490e2c7ea21sm157969205e9.1.2026.06.12.06.58.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Jun 2026 06:58:13 -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 , mbrugger@suse.com Subject: [PATCH v5 0/3] Add RP1 PWM controller support Date: Fri, 12 Jun 2026 16:01:25 +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 via syscon registers. A subsequent patch will add a new device and driver to read the RPM and export this value via hwmon. Subsequent patches will also add the CPU thermal zone, which acts as a consumer of the PWM device. Best regards, Andrea CHANGES in V5: - period_tick is now capped to U32_MAX to avoid breaking monotonicity - period_ticks less than 2 are set to 2 - fixed two casts in fromhw() that could led to an incorrect truncation/underflow - when disabling a pwm channel, first set the polarity to avoid unintended quiescent level - in probe function, fixed and error path that could leak an invalid pwm_chip struct 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: rpi-5: Add RP1 PWM node .../bindings/pwm/raspberrypi,rp1-pwm.yaml | 54 +++ .../boot/dts/broadcom/bcm2712-rpi-5-b.dts | 12 + arch/arm64/boot/dts/broadcom/rp1-common.dtsi | 9 + drivers/pwm/Kconfig | 9 + drivers/pwm/Makefile | 1 + drivers/pwm/pwm-rp1.c | 424 ++++++++++++++++++ 6 files changed, 509 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/raspberrypi,rp1-pwm.yaml create mode 100644 drivers/pwm/pwm-rp1.c -- 2.35.3