[0/8] pwm: Drop local locking in several drivers

Message ID	cover.1750788649.git.u.kleine-koenig@baylibre.com (mailing list archive)
Headers	From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= <u.kleine-koenig@baylibre.com> To: linux-pwm@vger.kernel.org Cc: Claudiu Beznea <claudiu.beznea@tuxon.dev>, Nicolas Ferre <nicolas.ferre@microchip.com>, Alexandre Belloni <alexandre.belloni@bootlin.com>, linux-arm-kernel@lists.infradead.org, Vladimir Zapolskiy <vz@mleia.com>, Conor Dooley <conor.dooley@microchip.com>, Daire McNamara <daire.mcnamara@microchip.com>, linux-riscv@lists.infradead.org, Chen-Yu Tsai <wens@csie.org>, Jernej Skrabec <jernej.skrabec@gmail.com>, Samuel Holland <samuel@sholland.org>, linux-sunxi@lists.linux.dev Subject: [PATCH 0/8] pwm: Drop local locking in several drivers Date: Tue, 24 Jun 2025 20:15:36 +0200 Message-ID: <cover.1750788649.git.u.kleine-koenig@baylibre.com> Precedence: bulk MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Status: O
Series	pwm: Drop local locking in several drivers \| [0/8] pwm: Drop local locking in several drivers [7/8] pwm: sun4i: Drop driver local locking

Message ID

cover.1750788649.git.u.kleine-koenig@baylibre.com (mailing list archive)

Headers

From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= <u.kleine-koenig@baylibre.com>
To: linux-pwm@vger.kernel.org
Cc: Claudiu Beznea <claudiu.beznea@tuxon.dev>,
	Nicolas Ferre <nicolas.ferre@microchip.com>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	linux-arm-kernel@lists.infradead.org,
	Vladimir Zapolskiy <vz@mleia.com>,
	Conor Dooley <conor.dooley@microchip.com>,
	Daire McNamara <daire.mcnamara@microchip.com>,
	linux-riscv@lists.infradead.org,
	Chen-Yu Tsai <wens@csie.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Samuel Holland <samuel@sholland.org>,
	linux-sunxi@lists.linux.dev
Subject: [PATCH 0/8] pwm: Drop local locking in several drivers
Date: Tue, 24 Jun 2025 20:15:36 +0200
Message-ID: <cover.1750788649.git.u.kleine-koenig@baylibre.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Status: O

Series

pwm: Drop local locking in several drivers |

Message

Uwe Kleine-König June 24, 2025, 6:15 p.m. UTC

Hello,

some time ago the pwm core implemented additional locking to protect
lowlevel driver callbacks against driver removal. A side effect is that
.apply() and .get_state() are serialized. This allows to drop some
locking that is now superfluous due to the core's locking.

I identified a few drivers that are affected; these are cleaned up
accordingly here.

Best regards
Uwe

Uwe Kleine-König (8):
  pwm: atmel: Drop driver local locking
  pwm: clps711x: Drop driver local locking
  pwm: fsl-ftm: Drop driver local locking
  pwm: lpc18xx-sct: Drop driver local locking
  pwm: microchip-core: Drop driver local locking
  pwm: sti: Drop driver local locking
  pwm: sun4i: Drop driver local locking
  pwm: twl-led: Drop driver local locking

 drivers/pwm/pwm-atmel.c          | 12 --------
 drivers/pwm/pwm-clps711x.c       |  8 ------
 drivers/pwm/pwm-fsl-ftm.c        | 28 +++++-------------
 drivers/pwm/pwm-lpc18xx-sct.c    | 14 ---------
 drivers/pwm/pwm-microchip-core.c | 17 +----------
 drivers/pwm/pwm-sti.c            | 23 ++++-----------
 drivers/pwm/pwm-sun4i.c          | 10 -------
 drivers/pwm/pwm-twl-led.c        | 49 +++++---------------------------
 8 files changed, 21 insertions(+), 140 deletions(-)

base-commit: f817b6dd2b62d921a6cdc0a3ac599cd1851f343c