linux-kernel - Re: [PATCH v1 3/3] ARM: dts: imx6qdl-colibri: backlight pwm: Simplify inverted backlight

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Message-ID: <CAOMZO5B1ESLpmK3fM9CzqYEWz969BajPAEbetofC4rDxg5V+dw@mail.gmail.com>
Date:   Tue, 10 May 2022 22:25:55 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Max Krummenacher <max.oss.09@...il.com>
Cc:     Max Krummenacher <max.krummenacher@...adex.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 3/3] ARM: dts: imx6qdl-colibri: backlight pwm: Simplify
 inverted backlight

On Mon, May 9, 2022 at 8:12 AM Max Krummenacher <max.oss.09@...il.com> wrote:
>
> From: Max Krummenacher <max.krummenacher@...adex.com>
>
> Set #pwm-cells to the default 3 to gain access to the parameter
> which allows inverting the PWM signal. This is useful to specify
> a backlight which has its highest brightness at 0.
>
> Also adapt the brightness steps as the backlight doesn't light up
> for very low duty cycles.

This should probably be a different patch.