linux-kernel - Re: [PATCH v8 3/3] regulator: axp20x: Add support for AXP313a variant

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Date:   Tue, 28 Feb 2023 22:09:43 +0100
From:   Martin Botka <martin.botka@...ainline.org>
To:     Shengyu Qu <wiagn233@...look.com>
Cc:     wens@...e.org, martin.botka1@...il.com,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Jami Kettunen <jamipkettunen@...ainline.org>,
        Paul Bouchara <paul.bouchara@...ainline.org>,
        Jan Trmal <jtrmal@...il.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Andre Przywara <andre.przywara@....com>,
        Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 3/3] regulator: axp20x: Add support for AXP313a variant


Hi Shengyu,
On Sat, Feb 18 2023 at 06:08:06 PM +08:00:00, Shengyu Qu 
<wiagn233@...look.com> wrote:
> Hi Martin,
> 
>> On Sat, Jan 21, 2023 at 2:45 AM Martin Botka
>> <martin.botka@...ainline.org> wrote:
>>> The AXP313a is your typical I2C controlled PMIC, although in a 
>>> lighter
>>> fashion compared to the other X-Powers PMICs: it has only three DCDC
>>> rails, three LDOs, and no battery charging support.
>>> 
>>> The AXP313a datasheet does not describe a register to change the 
>>> DCDC
>>> switching frequency, and talks of it being fixed at 3 MHz. The BSP
>>> driver hints at a register being able to change that, but we haven't
>>> verified that, so leave that one out. It can be added later, if 
>>> needed
>>> and/or required.
>> The datasheet released by MangoPi says this isn't configurable. The
>> thing that is configurable is spread-spectrum operation, and mode
>> switching between fixed PWM and hybrid PFM/PWM. So just drop the
>> DCDC frequency stuff and use the default code path.
> 
> You could get full datasheet of AXP313A here:
> 
> https://github.com/YuzukiHD/YuzukiChameleon/blob/master/Datasheet/AXP313A_Datasheet_V1.0_cn.pdf

I do have the datasheet but maybe this one is more up to date somehow. 
Will have to check.
> 
> Btw I'm working on AXP15060 support mostly based on your series.
Lovely to hear. So sorry for the very very late reply. New semester 
began 3 weeks ago and been quite the ride.
Would love to get the series more up to date in the upcoming weeks :) I 
will see what time allows :)
> 
> 
> Best regards,
> 
> Shengyu
Best regards,

Martin