linux-kernel - Re: [PATCH v6 2/4] leds: Add driver for Qualcomm LPG

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Date:   Thu, 22 Oct 2020 21:25:31 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Lee Jones <lee.jones@...aro.org>,
        Martin Botka <martin.botka1@...il.com>,
        linux-arm-msm@...r.kernel.org
Cc:     linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-pwm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH v6 2/4] leds: Add driver for Qualcomm LPG

Hi Bjorn,

On Mittwoch, 21. Oktober 2020 22:12:22 CEST Bjorn Andersson wrote:
> The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
> PMICs from Qualcomm. It can operate on fixed parameters or based on a
> lookup-table, altering the duty cycle over time - which provides the
> means for e.g. hardware assisted transitions of LED brightness.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
> 
> Changes since v5:
> - Make sure to not used the state of the last channel in a group to
> determine if the current sink should be active for all channels in the
> group. - Replacement of unsigned -1 with UINT_MAX
> - Work around potential overflow by using larger data types, instead of
> separate code paths - Use cpu_to_l16() rather than hand rolling them
> - Minor style cleanups
> 
>  drivers/leds/Kconfig         |    9 +
>  drivers/leds/Makefile        |    1 +
>  drivers/leds/leds-qcom-lpg.c | 1190 ++++++++++++++++++++++++++++++++++
>  3 files changed, 1200 insertions(+)
>  create mode 100644 drivers/leds/leds-qcom-lpg.c

Tested on msm8974 (pm8941) on the Fairphone 2, works great there!

Tested-by: Luca Weiss <luca@...tu.xyz>

Regards
Luca