linux-kernel - Re: [PATCH v14 2/2] leds: Add driver for Qualcomm LPG

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Date:   Wed, 4 May 2022 09:30:09 +0200
From:   Pavel Machek <pavel@....cz>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Lee Jones <lee.jones@...aro.org>,
        Luca Weiss <luca@...tu.xyz>,
        Doug Anderson <dianders@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Corbet <corbet@....net>, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-pwm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v14 2/2] leds: Add driver for Qualcomm LPG

Hi!

> +/sys/class/leds/<led>/hw_pattern
> +--------------------------------
> +
> +Specify a hardware pattern for a Qualcomm LPG LED.
> +
> +The pattern is a series of brightness and hold-time pairs, with the hold-time
> +expressed in milliseconds. The hold time is a property of the pattern and must
> +therefor be identical for each element in the pattern (except for the pauses
> +described below).

therefore?

> +Simple pattern::
> +
> +    "255 500 0 500"
> +
> +        ^
> +        |
> +    255 +----+    +----+
> +        |    |    |    |      ...
> +      0 |    +----+    +----
> +        +---------------------->
> +        0    5   10   15     time (100ms)
> +
> +The LPG supports specifying a longer hold-time for the first and last element
> +in the pattern, the so called "low pause" and "high pause".

Please see
Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt . This
should really be compatible.

Can I get either patch to disable pattern infrastructure for now or to
get it compatible?

Best regards,
								Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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