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

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Date:   Thu, 15 Apr 2021 10:46:50 +0000
From:   Yassine Oudjana <y.oudjana@...tonmail.com>
To:     bjorn.andersson@...aro.org
Cc:     agross@...nel.org, devicetree@...r.kernel.org, dmurphy@...com,
        lee.jones@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-pwm@...r.kernel.org, martin.botka1@...il.com, pavel@....cz,
        robh+dt@...nel.org, thierry.reding@...il.com,
        u.kleine-koenig@...gutronix.de,
        Yassine Oudjana <y.oudjana@...tonmail.com>
Subject: Re: [PATCH v6 2/4] leds: Add driver for Qualcomm LPG

Hi,

On Wed, 21 Oct 2020 13:12:22 -0700 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

Works well on the Xiaomi Mi Note 2 (msm8996pro/pmi8996).

Tested-by: Yassine Oudjana <y.oudjana@...tonmail.com>

Regards,
Yassine