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

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Message-ID: <864eb6ad-a605-c0a0-c3e7-23c0c70f5ede@gmail.com>
Date:   Fri, 24 Apr 2020 12:23:59 +0200
From:   saravanan sekar <sravanhome@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
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

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.
>
>>>> 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.