linux-kernel - Re: [PATCH v2 2/3] mfd: lp873x: Add lp873x PMIC support

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Date:	Tue, 17 May 2016 13:34:24 +0530
From:	Keerthy <a0393675@...com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Keerthy <j-keerthy@...com>, <broonie@...nel.org>,
	<lgirdwood@...il.com>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<robh+dt@...nel.org>, <mark.rutland@....com>
Subject: Re: [PATCH v2 2/3] mfd: lp873x: Add lp873x PMIC support



On Tuesday 17 May 2016 01:31 PM, Lee Jones wrote:
> On Fri, 13 May 2016, Keerthy wrote:
>> On Thursday 12 May 2016 06:48 PM, Lee Jones wrote:
>>> On Tue, 10 May 2016, Keerthy wrote:
>>>
>>>> The LP873X chip is a power management IC for Portable Navigation Systems
>>>>      and Tablet Computing devices. It contains the following components:
>>>>
>>>>       - Regulators.
>>>>       - Configurable General Purpose Output Signals(GPO).
>>>>
>>>> PMIC interacts with the main processor through i2c. PMIC has
>>>> couple of LDOs(Linear Regulators), couple of BUCKs (Step-Down DC-DC
>>>> Converter Cores) and GPOs(General Purpose Output Signals). At this
>>>> time only the regulator functionality is made available.
>>>>
>>>> Signed-off-by: Keerthy <j-keerthy@...com>
>>>> ---
>>>>
>>>> Changes in v2:
>>>>
>>>>    * Used mfd_add_devices instead of of_pltaform_populate.
>>>
>>> Didn't see this conversation, but of_platform_populate () is usually
>>> okay?
>>
>> https://lkml.org/lkml/2016/5/6/244.
>
> Did Mark tell you why you shouldn't be using it?

"You shouldn't be using that, you should just have a table of subdevices
in the MFD"

I inferred not to use of_platform_populate and make use of 
mfd_add_devices instead.

Please correct me if am wrong.

>
>>>>   drivers/mfd/Kconfig        |  15 +++
>>>>   drivers/mfd/Makefile       |   2 +
>>>>   drivers/mfd/lp873x.c       |  98 +++++++++++++++++
>>>>   include/linux/mfd/lp873x.h | 265 +++++++++++++++++++++++++++++++++++++++++++++
>>>>   4 files changed, 380 insertions(+)
>>>>   create mode 100644 drivers/mfd/lp873x.c
>>>>   create mode 100644 include/linux/mfd/lp873x.h
>
> [...]
>
>>>> +/**
>>>> + * struct lp873x - state holder for the lp873x driver
>>>> + * Device data may be used to access the LP873X chip
>>>> + */
>>>> +struct lp873x {
>>>> +	struct device *dev;
>>>> +	unsigned long id;
>>>> +	u8 rev;
>>>> +	struct mutex lp873_lock;	/* lock guarding the data structure */
>>>> +	struct regmap *regmap;
>>>
>>> Are all of these used in >1 driver?
>>
>> Apart from id and rev all are used.
>
> Then why are id and rev in there?
>