linux-kernel - Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

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Message-ID: <20200424105319.GD8414@dell>
Date:   Fri, 24 Apr 2020 11:53:19 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     saravanan sekar <sravanhome@...il.com>
Cc:     andy.shevchenko@...il.com, robh+dt@...nel.org, jic23@...nel.org,
        knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        sre@...nel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

On Fri, 24 Apr 2020, saravanan sekar wrote:

> Hi Lee,
> 
> On 24/04/20 11:37 am, Lee Jones wrote:
> > On Fri, 24 Apr 2020, saravanan sekar wrote:
> > 
> > > Hi Lee,
> > > 
> > > On 24/04/20 9:18 am, Lee Jones wrote:
> > > > On Wed, 15 Apr 2020, Saravanan Sekar wrote:
> > > > 
> > > > > mp2629 is a highly-integrated switching-mode battery charge management
> > > > > device for single-cell Li-ion or Li-polymer battery.
> > > > > 
> > > > > Add MFD core enables chip access for ADC driver for battery readings,
> > > > > and a power supply battery-charger driver
> > > > > 
> > > > > Signed-off-by: Saravanan Sekar <sravanhome@...il.com>
> > > > > ---
> > > > >    drivers/mfd/Kconfig        |  9 ++++
> > > > >    drivers/mfd/Makefile       |  2 +
> > > > >    drivers/mfd/mp2629.c       | 86 ++++++++++++++++++++++++++++++++++++++
> > > > >    include/linux/mfd/mp2629.h | 19 +++++++++
> > > > >    4 files changed, 116 insertions(+)
> > > > >    create mode 100644 drivers/mfd/mp2629.c
> > > > >    create mode 100644 include/linux/mfd/mp2629.h
> > > > How is this driver registered?
> > > > 
> > > > Looks like it has device tree support.  Is there another way?
> > > Yes, only using device tree
> > Then how about using 'simple-mfd' and 'syscon'?
> > 
> > Then you can omit this driver completely.
> 
> The exception is to support for non device tree platform as well, but I have
> tested only for ARM device tree platform.

Is that a reality though?

How else do you see this realistically being registered?

> > > > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > > > > index 3c547ed575e6..85be799795aa 100644
> > > > > --- a/drivers/mfd/Kconfig
> > > > > +++ b/drivers/mfd/Kconfig
> > > > > @@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
> > > > >    	help
> > > > >    	  Select this if your MC13xxx is connected via an I2C bus.
> > > > > +config MFD_MP2629
> > > > > +	tristate "Monolithic power system MP2629 ADC and Battery charger"
> > > > > +	depends on I2C
> > > > > +	select REGMAP_I2C
> > > > > +	help
> > > > > +	  Select this option to enable support for monolithic power system
> > > > > +	  battery charger. This provides ADC, thermal, battery charger power
> > > > > +	  management functions on the systems.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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