{"id":2221973,"url":"http://patchwork.ozlabs.org/api/covers/2221973/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pwm/cover/cover.1775829499.git.andrea.porta@suse.com/","project":{"id":38,"url":"http://patchwork.ozlabs.org/api/projects/38/?format=json","name":"Linux PWM development","link_name":"linux-pwm","list_id":"linux-pwm.vger.kernel.org","list_email":"linux-pwm@vger.kernel.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"","list_archive_url":null,"date":"2026-04-10T14:09:56","name":"[v2,0/3] Add RP1 PWM controller support","submitter":{"id":88172,"url":"http://patchwork.ozlabs.org/api/people/88172/?format=json","name":"Andrea della Porta","email":"andrea.porta@suse.com"},"mbox":"http://patchwork.ozlabs.org/project/linux-pwm/cover/cover.1775829499.git.andrea.porta@suse.com/mbox/","series":[{"id":499466,"url":"http://patchwork.ozlabs.org/api/series/499466/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pwm/list/?series=499466","date":"2026-04-10T14:09:56","name":"Add RP1 PWM controller support","version":2,"mbox":"http://patchwork.ozlabs.org/series/499466/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/covers/2221973/comments/","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pwm@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=suse.com header.i=@suse.com header.a=rsa-sha256\n header.s=google header.b=dfpZ2L9s;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; helo=sto.lore.kernel.org;\n envelope-from=linux-pwm+bounces-8546-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com\n header.b=\"dfpZ2L9s\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=209.85.128.53","smtp.subspace.kernel.org;\n dmarc=pass (p=quarantine dis=none) header.from=suse.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=suse.com"],"Received":["from sto.lore.kernel.org (sto.lore.kernel.org\n [IPv6:2600:3c09:e001:a7::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fsdsW2kTQz1yGb\n\tfor ; Sat, 11 Apr 2026 00:07:10 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sto.lore.kernel.org (Postfix) with ESMTP id AF593301E01C\n\tfor ; Fri, 10 Apr 2026 14:07:06 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 1F2393CBE6E;\n\tFri, 10 Apr 2026 14:07:04 +0000 (UTC)","from mail-wm1-f53.google.com (mail-wm1-f53.google.com\n [209.85.128.53])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 77A161E7C12\n\tfor ; Fri, 10 Apr 2026 14:07:02 +0000 (UTC)","by mail-wm1-f53.google.com with SMTP id\n 5b1f17b1804b1-488ab2db91aso30830045e9.3\n for ; Fri, 10 Apr 2026 07:07:02 -0700 (PDT)","from localhost (93-41-3-120.ip79.fastwebnet.it. 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This is necessary to operate the\ncooling fan connected to one of the PWM channels.\n\nThe tachometer pin for the fan speed is managed by the firmware \nrunning on the RP1's M-core. It uses the PHASE2 register\nto report the RPM, which is then exported by this driver via\nsyscon registers. A subsequent patch will add a new device\nand driver to read the RPM and export this value via hwmon.\n \nSubsequent patches will also add the CPU thermal zone, which\nacts as a consumer of the PWM device.\n\nBest regards,\nAndrea\n\nCHANGES in V2:\n\n- bindings: added syscon to the description\n- bindings: changed additionalProperties to unevaluatedProperties\n- dts: reordered pwm node to follow the unit address ordering\n- Kconfig/Makefile: renamed config option to PWM_RASPBERRYPI_RP1\n- Kconfig: added dependency for syscon/regmap\n- driver: added 'Limitations' and 'Datasheet' paragraphs in top comment\n- driver: all macros are now prefixed by RP1_PWM_\n- driver: implemented waveform callbacks instead of legacy ones\n- driver: dropped hwmon device registration for fan speed (this will be\n handled in a separate patch with its own driver reading the value via\n syscon)\n- driver: added new regmap/syscon to export the registers.\n- driver: added a comment in rp1_pwm_apply_config() to describe what it does\n- driver: added a comment to rp1_pwm_request() to define the purpose of the\n last write\n- driver: new clk_enabled flag to deal with the clock on suspend/resume path\n- driver: clk_rate is now obtained during probe right after exclusive_get()\n- driver/Kconfig: module is now static only and has suppress_bind_attr to\n avoid racing with syscon consumer drivers and with syscon unload issue\n\nNaushir Patuck (2):\n dt-bindings: pwm: Add Raspberry Pi RP1 PWM controller\n pwm: rp1: Add RP1 PWM controller driver\n\nStanimir Varbanov (1):\n arm64: dts: broadcom: rpi-5: Add RP1 PWM node\n\n .../bindings/pwm/raspberrypi,rp1-pwm.yaml | 54 +++\n .../boot/dts/broadcom/bcm2712-rpi-5-b.dts | 12 +\n arch/arm64/boot/dts/broadcom/rp1-common.dtsi | 10 +\n drivers/pwm/Kconfig | 9 +\n drivers/pwm/Makefile | 1 +\n drivers/pwm/pwm-rp1.c | 344 ++++++++++++++++++\n 6 files changed, 430 insertions(+)\n create mode 100644 Documentation/devicetree/bindings/pwm/raspberrypi,rp1-pwm.yaml\n create mode 100644 drivers/pwm/pwm-rp1.c"}