linux-kernel - Re: [PATCH v2 2/5] MFD: RK808: Add new mfd driver for RK808

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Date:	Tue, 26 Aug 2014 18:39:42 +0800
From:	Chris Zhong <zyw@...k-chips.com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	sameo@...ux.intel.com, lgirdwood@...il.com, broonie@...nel.org,
	a.zummo@...ertech.it, mturquette@...aro.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	rtc-linux@...glegroups.com, grant.likely@...aro.org,
	hl@...k-chips.com, huangtao@...k-chips.com, cf@...k-chips.com,
	zhangqing@...k-chips.com, xxx@...k-chips.com,
	dianders@...omium.org, heiko@...ech.de, olof@...om.net,
	sonnyrao@...omium.org, dtor@...omium.org,
	javier.martinez@...labora.co.uk, kever.yang@...k-chips.com
Subject: Re: [PATCH v2 2/5] MFD: RK808: Add new mfd driver for RK808


On 08/26/2014 06:20 PM, Lee Jones wrote:
> On Tue, 26 Aug 2014, Chris Zhong wrote:
>> On 08/26/2014 05:22 PM, Lee Jones wrote:
>>> On Mon, 25 Aug 2014, Chris Zhong wrote:
>>>> On 08/20/2014 05:21 PM, Lee Jones wrote:
>>>>> On Wed, 20 Aug 2014, Chris Zhong wrote:
>>>>>
>>>>>> The RK808 chip is a power management IC for multimedia and handheld
>>>>>> devices. It contains the following components:
>>>>>>
>>>>>> - Regulators
>>>>>> - RTC
>>>>>>
>>>>>> The rk808 core driver is registered as a platform driver and provides
>>>>>> communication through I2C with the host device for the different
>>>>>> components.
>>>>>>
>>>>>> Signed-off-by: Chris Zhong <zyw@...k-chips.com>
>>>>>> ---
>>> [...]
>>>
>>>>>> +	rk808->pdata = pdata;
>>>>> Remove pdata from 'struct rk808'.  You can obtain it from dev.
>>>> Can I keep this pdata in rk808, because it is used in the regulator driver.
>>>> The one obtain from dev maybe empty.
>>> If the one in dev is empty, you should populate that instead.
>> So, should I malloc a pada, and assign it to client->dev?
> If client->dev.pdata is NULL, yes.
>
> But actually, I have more important questions that need to be answered
> first.  Ones which I would normally be able to answer myself if the
> patch-set had been sent as one (i.e. threaded) instead of as
> individual patches:
>
> - What are you using pdata for?

For save some properties,

like "rockchip,system-power-controller" in MFD
and some regulator properties in regulator/rk808...

> - Where is pdata populated?

It is populated in probe in mfd/rk808.c

actually, I copy it from tps65910.c


> - Where is pdata used?

pdata is used in mfd and regulator



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