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[2003:f6:5f00:7808::1b9]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-441b2bb5ec8sm22522495e9.23.2025.04.30.04.56.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Apr 2025 04:56:18 -0700 (PDT) From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= To: linux-pwm@vger.kernel.org Cc: David Lechner , Kent Gibson , linux-kernel@vger.kernel.org Subject: [PATCH v7 0/4] pwm: userspace support Date: Wed, 30 Apr 2025 13:55:57 +0200 Message-ID: X-Mailer: git-send-email 2.47.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Developer-Signature: v=1; a=openpgp-sha256; l=1504; i=u.kleine-koenig@baylibre.com; h=from:subject:message-id; bh=+DkcJUUcvjZeQMMqsoPFA0SMW+ilrUpwRUdNYgKcY/w=; b=owEBbQGS/pANAwAKAY+A+1h9Ev5OAcsmYgBoEg/OenXMSbEhIAiQ3asN3UyPcph3/OJSxaPPs EoaKbzFDJWJATMEAAEKAB0WIQQ/gaxpOnoeWYmt/tOPgPtYfRL+TgUCaBIPzgAKCRCPgPtYfRL+ ThoiCACDLpGudfttYVlsIvqzM4lEf+ATXZTPxXP68F6gKP3MJpjM/SxvxvcvJ06UKmctxt+ykRo EEGe1GgisB05tOntMASuo1TEzlOxSIsgX31V92CJArJ6j/V/+IlEiFgyn5dm2fG4FYHfO4LCXhW Bepgs52KMDBaS8eiCENsDYyFSli4EX9pWsSJ9qtAhocdx+y+r2B7/OboAPlcpxua3tFrWySjwIt iMqvxxnyTPTuqTcx7E1jzgOtbQO1HYO8zg8584V/TfJWX+Rg9UpfMFy3uUXm9rr7xeZyNpa8pFW STznxVQ3kGvBzTxskzU9/UCkJ6eBxCr09vwnbYA//M1+AHX4 X-Developer-Key: i=u.kleine-koenig@baylibre.com; a=openpgp; fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6 Content-Transfer-Encoding: 8bit Hello, after the feedback I got from David on v7[1] and some internal discussion here comes a new version of the patch. Apart from rebasing to a newer base (current pwm/for-next) the only change in the relevant patch #4 about return values from the PWM_IOCTL_SETEXACTWF ioctl. Instead of returning 1 if the request failed to apply exactly, return -EDOM. The earlier patches in this series prepare that and implement a similar change in pwm_set_waveform_might_sleep() to simplify also other users of this function. Patch #3 is only a documentation update that is not strictly related to the userspace chardev, but reflects the changes in patches #1 and #2. Feedback welcome. Best regards Uwe [1] https://lore.kernel.org/linux-pwm/20250416094316.2494767-2-u.kleine-koenig@baylibre.com Uwe Kleine-König (4): pwm: Let pwm_set_waveform_might_sleep() fail for exact but impossible requests pwm: Let pwm_set_waveform_might_sleep() return 0 instead of 1 after rounding up pwm: Formally describe the procedure used to pick a hardware waveform setting pwm: Add support for pwmchip devices for faster and easier userspace access drivers/pwm/core.c | 369 ++++++++++++++++++++++++++++++++++++--- include/linux/pwm.h | 3 + include/uapi/linux/pwm.h | 53 ++++++ 3 files changed, 404 insertions(+), 21 deletions(-) create mode 100644 include/uapi/linux/pwm.h base-commit: e373991eb9ff0a9617634017c7f19fd36ec4f208 -- 2.47.2