From: sashiko-bot@kernel.org
To: "Nora Schiffer" <nora.schiffer@ew.tq-group.com>
Cc: devicetree@vger.kernel.org, robh@kernel.org, lee@kernel.org,
linux-leds@vger.kernel.org, conor+dt@kernel.org
Subject: Re: [PATCH v5 11/11] leds: pca995x: Add support for group brightness control
Date: Mon, 05 Oct 2026 14:27:23 +0000 [thread overview]
Message-ID: <20261005142723.6847A1F000FF@smtp.kernel.org> (raw)
In-Reply-To: <268cf89c02f166a012802cdae0c187566b903309.1791207391.git.nora.schiffer@ew.tq-group.com>
> When LEDs are set to PWM mode with group control enabled, their
> brightness can control using a global "group PWM" setting, modulating
> the individual LEDs' brightness with a second PWM running at a different
> frequency. This lowers the minimum duty cycle from 1/256 to 1/65536
> (averaged over the modulated signal). Group brightness control is
> particularly useful to adjust for different levels of ambient light.
>
> For simplicity, group PWM mode is always enabled, with the reset default
> of 255 as group brightness. This reduces the effective duty cycle by
> 1/256 at all individual brightness levels (the individual PWM signals
> are modulated with the 255/256 duty cycle group PWM), which should be
> imperceptible.
>
> Signed-off-by: Nora Schiffer <nora.schiffer@ew.tq-group.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/cover.1791207391.git.nora.schiffer@ew.tq-group.com?part=11
prev parent reply other threads:[~2026-10-05 14:27 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-05 13:53 [PATCH v5 00/11] leds: pca995x: Minor fixes; reset, output-gain, error reporting and group brightness support Nora Schiffer
2026-10-05 13:53 ` [PATCH v5 01/11] dt-bindings: leds: pca995x: Describe reset-gpios property Nora Schiffer
2026-10-05 14:21 ` sashiko-bot
2026-10-05 13:53 ` [PATCH v5 02/11] dt-bindings: leds: pca995x: Describe nxp,output-gain property Nora Schiffer
2026-10-05 14:23 ` sashiko-bot
2026-10-05 13:53 ` [PATCH v5 03/11] leds: pca995x: Fix maximum LED index for 16-channel variants Nora Schiffer
2026-10-05 14:27 ` sashiko-bot
2026-10-05 13:53 ` [PATCH v5 04/11] leds: pca995x: Fix fwnode handle leaks in error paths Nora Schiffer
2026-10-05 14:28 ` sashiko-bot
2026-10-05 13:53 ` [PATCH v5 05/11] leds: pca995x: Write global registers before creating LED devices Nora Schiffer
2026-10-05 14:24 ` sashiko-bot
2026-10-05 13:53 ` [PATCH v5 06/11] leds: pca995x: Add support for reset GPIO Nora Schiffer
2026-10-05 14:25 ` sashiko-bot
2026-10-05 13:53 ` [PATCH v5 07/11] leds: pca995x: Make output gain configurable Nora Schiffer
2026-10-05 14:25 ` sashiko-bot
2026-10-05 13:53 ` [PATCH v5 08/11] leds: pca995x: Initialize MODE2 register on probe Nora Schiffer
2026-10-05 14:25 ` sashiko-bot
2026-10-05 13:53 ` [PATCH v5 09/11] leds: pca995x: Add sysfs files for error reporting Nora Schiffer
2026-10-05 14:26 ` sashiko-bot
2026-10-05 13:53 ` [PATCH v5 10/11] leds: pca995x: Do not use full on LED mode Nora Schiffer
2026-10-05 14:26 ` sashiko-bot
2026-10-05 13:53 ` [PATCH v5 11/11] leds: pca995x: Add support for group brightness control Nora Schiffer
2026-10-05 14:27 ` sashiko-bot [this message]
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