linux-kernel - Re: [PATCH v2 2/4] mfd: rt5120: Add Richtek PMIC support

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Date:   Mon, 4 Jul 2022 17:14:41 +0800
From:   ChiYuan Huang <u0084500@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Mark Brown <broonie@...nel.org>, dmitry.torokhov@...il.com,
        Liam Girdwood <lgirdwood@...il.com>,
        cy_huang <cy_huang@...htek.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, lkml <linux-kernel@...r.kernel.org>,
        linux-input@...r.kernel.org
Subject: Re: [PATCH v2 2/4] mfd: rt5120: Add Richtek PMIC support

Hi, Lee:

ChiYuan Huang <u0084500@...il.com> 於 2022年7月1日 週五 下午5:56寫道：
>
> Lee Jones <lee.jones@...aro.org> 於 2022年7月1日 週五 下午3:38寫道：
> >
> > On Fri, 01 Jul 2022, ChiYuan Huang wrote:
> >
> > > HI, Lee:
> > >
> > > ChiYuan Huang <u0084500@...il.com> 於 2022年6月27日 週一 晚上10:56寫道：
> > > >
> > > > Lee Jones <lee.jones@...aro.org> 於 2022年6月27日 週一 晚上10:22寫道：
> > > > >
> > > > > On Wed, 22 Jun 2022, cy_huang wrote:
> > > > >
> > > > > > From: ChiYuan Huang <cy_huang@...htek.com>
> > > > > >
> > > > > > Add Richtek RT5120 PMIC I2C driver.
> > > > >
> > > > > Why a whole new driver?
> > > > >
> > > > > How different is this to rt5033?
> > > > >
> > > > > Looks like this could easily be woven into this existing support?
> > > > >
> > > > It's different with the function domain.
> > > > RT5033 is most like as the SubPMIC that includes PMU (battery
> > > > charger/gauge/led/few buck and ldo)
> > > > RT5120 is a main PMIC with default-on power that follows the boot on sequence.
> > > > RT5120 only integrates regulator and power key report module.
> > > >
> > > Since I have explained the chip difference, do you still think it's
> > > better to merge this code into rt5033 mfd?
> >
> > I think it's okay to group devices which are similar but not exactly
> > the same, if they can be.  The integration of this device into the
> > other looks trivial to my naive eyes.
> >
> > A PMIC is a PMIC, main or sub.
> >
> M.. ok. I will try to group all chip changes like as devices
> list/regmap_irq/regmap_config ..., etc.
> Treat it as one set of chip config and use 'of_device_get_match_data'
> to get the chip config data.
>
There's a question.
As I know, it's not the same chip series.
The rt5033 is submitted from Samsung at 2015.
The driver data is also defined in header file.

Do you still suggest to do the merge?
Even in our internal, it's difficult to find a rt5033 EVB for testing.

And one more question is the binding. If yes, for the binding, I need to add
rt5033 related.....

Actually, it's a tough work.
> > > > > > Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
> > > > > > ---
> > > > > >  drivers/mfd/Kconfig  |  12 +++++
> > > > > >  drivers/mfd/Makefile |   1 +
> > > > > >  drivers/mfd/rt5120.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++++++
> > > > > >  3 files changed, 138 insertions(+)
> > > > > >  create mode 100644 drivers/mfd/rt5120.c
> >
> > --
> > Lee Jones [李琼斯]
> > Principal Technical Lead - Developer Services
> > Linaro.org │ Open source software for Arm SoCs
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