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Wed, 14 Oct 2026 11:04:36 +0000 From: Hal Feng To: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Philipp Zabel , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Emil Renner Berthing , Palmer Dabbelt , Paul Walmsley , Albert Ou Cc: Hal Feng , linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v23 0/2] Add OpenCores PTC PWM support Date: Wed, 14 Oct 2026 19:04:27 +0800 Message-ID: <20261014110429.52762-1-hal.feng@starfivetech.com> X-Mailer: git-send-email 2.43.2 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: NT0PR01CA0020.CHNPR01.prod.partner.outlook.cn (2406:e500:c510:c::16) To NT0PR01MB1102.CHNPR01.prod.partner.outlook.cn (2406:e500:c510:7::10) Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: NT0PR01MB1102:EE_|NT0PR01MB1069:EE_ X-MS-Office365-Filtering-Correlation-Id: 6fbf237e-e26c-44e4-bc66-08df29e2ef3d X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|7416014|366016|52116014|23010399003|38350700014|56012099006|261009223027099003|10067099003|18002099003; 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I will maintain this pwm module in place of William. Changes since v22: - Drop patch 2 since it is already merged. - Drop the starfive,jhb100-pwm compatible from the dt-bindings, as the pwm module of JHB100 SoC differs slightly from the OpenCores PTC PWM module in polarity handling. The support for JHB100 SoC will be added in a separate patch. - Move the polarity check later in .apply(). - Add comments for keeping the reference when the pwm is already enabled. - Rebase on linux-next. Changes since v21: - Allow non-zero duty cycles shorter than one clock tick to round down to zero. - Drop the .free() callback to preserve the PWM hardware state after pwm_put(). - Update the comment. Changes since v20: - Fix 0% duty cycle support. Changes since v19: - Drop the oneOf construct in dt-bindings. - Address Sashiko AI review comments for the OpenCores PWM driver. In ocores_pwm_apply(), handling disable requests first, then calculating and validating period/duty for enable requests before taking a runtime PM reference or touching the hardware registers. Changes since v18: - Address Sashiko AI review comments for the OpenCores PWM driver. - Fix runtime PM usage count handling on probe, error paths, PWM release and driver teardown. - Reject period or duty cycle values below the hardware minimum. - Restore PWM registers across system sleep resume. - Return the real error from devm_pwmchip_alloc(). - Preserve bootloader-configured PWM state during probe and keep runtime PM active if the PWM is already enabled. - Use synchronous runtime PM put before possible teardown. Changes since v17: - Simplify the code. Make it more readable. - Restructure the driver to register the pwm chip for one pwm channel, because each OpenCores PTC IP core only supports one PWM channel. Drop starfive compatibles. Add patches to fix the dt-bindings and device tree. - Support runtime pm and system sleep pm. - Disable the pwm module and reset the pwm counter before updating the period and duty cycle. - Improve the descriptions. - Update the dt-bindings maintainer to Hal Feng. History: v22: https://lore.kernel.org/all/20260810030714.48100-1-hal.feng@starfivetech.com/ v21: https://lore.kernel.org/all/20260701074442.7714-1-hal.feng@starfivetech.com/ v20: https://lore.kernel.org/all/20260629063601.63917-1-hal.feng@starfivetech.com/ v19: https://lore.kernel.org/all/20260615155759.129210-1-hal.feng@starfivetech.com/ v18: https://lore.kernel.org/all/20260515054723.25024-1-hal.feng@starfivetech.com/ v17: https://lore.kernel.org/all/20250106103540.10079-1-william.qiu@starfivetech.com/ Hal Feng (2): dt-bindings: pwm: opencores: Update compatibles, examples and maintainers pwm: Add OpenCores PTC PWM driver .../bindings/pwm/opencores,pwm.yaml | 5 +- MAINTAINERS | 6 + drivers/pwm/Kconfig | 12 + drivers/pwm/Makefile | 1 + drivers/pwm/pwm-ocores.c | 299 ++++++++++++++++++ 5 files changed, 320 insertions(+), 3 deletions(-) create mode 100644 drivers/pwm/pwm-ocores.c base-commit: 1fffefb00cc0b0da1f2ae24e3d33364530ea6515 -- 2.43.2