linux-kernel - Re: [PATCH v3 3/4] mfd: tps65917: Add driver for the TPS65917 PMIC

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Message-ID: <537F2A15.9060901@ti.com>
Date:	Fri, 23 May 2014 16:29:33 +0530
From:	Keerthy <a0393675@...com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Keerthy <j-keerthy@...com>, <devicetree@...r.kernel.org>,
	<robh+dt@...nel.org>, <mark.rutland@....com>,
	<sameo@...ux.intel.com>, <grant.likely@...aro.org>,
	<ian@...mlogic.co.uk>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <broonie@...aro.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH v3 3/4] mfd: tps65917: Add driver for the TPS65917 PMIC

On Friday 23 May 2014 03:36 PM, Lee Jones wrote:
>>>>>> The TPS65917 chip is a power management IC for Portable Navigation Systems
>>>>>> and Tablet Computing devices. It contains the following components:
>>>>>>
>>>>>>   - Regulators.
>>>>>>   - Over Temperature warning and Shut down.
>>>>>>
>>>>>> This patch adds support for tps65917 mfd device. At this time only
>>>>>> the regulator functionality is made available.
>>>>>>
>>>>>> Signed-off-by: Keerthy <j-keerthy@...com>
>>>>>> ---
>>>>>> v3 Changes:
>>>>>>
>>>>>>   * Header file formating
>>>>>>   * Changed the cache_type to REGCACHE_RBTREE
>>>>>>   * removed unnecessary code
>>>>>>   * Corrected documentation style
>>>>>>   * Added pm_power_off function
>>>>>>
>>>>>>   v2 Changes:
>>>>>>
>>>>>>   * Added volatile register check as some of the registers
>>>>>>     in the set are volatile.
>>>>>> drivers/mfd/Kconfig          |   12 +
>>>>>>   drivers/mfd/Makefile         |    1 +
>>>>>>   drivers/mfd/tps65917.c       |  594 +++++++++++++++++
>>>>>>   include/linux/mfd/tps65917.h | 1485 ++++++++++++++++++++++++++++++++++++++++++
>>>>>>   4 files changed, 2092 insertions(+)
>>>>>>   create mode 100644 drivers/mfd/tps65917.c
>>>>>>   create mode 100644 include/linux/mfd/tps65917.h
> [...]
>
>>>>>> +		ret = regmap_read(tps65917->regmap[slave], addr, &reg);
>>>>>> +		if (ret)
>>>>>> +			goto err_irq;
>>>>>> +	}i
>>>>> What does the read do?  You're not doing anything with the value.
>>>> This pad1 and pad2 stuff is not needed. I will remove this.
>>> Then why is it in here?
>>>
>>> Did you copy this code from somewhere, if so, where?
>>>
>>> Okay, I just answered my own question.  There is so much common code
>>> in between this and palmas, there is no way I'm going to accept this
>>> driver.  Please merge it in with the palmas driver!
>>>
>> The chip is more like a subset of palmas with lot of register offset changes
>> and register bit field changes. Adding this would make it clumsy.
>> There could
>> be lot of checks. That is why i chose to write a new driver.
>>
>> Palmas driver already supports palmas variants and tps659038. Merging
>> this would mean more and more checks :-/.
> Then find an elegant way of representing the variants.  I'm not
> prepared to carry that much duplicated code in MFD.  It's already
> overladened and in need of an overhaul.  This will exacerbate the
> matter.
>

Okay. I am working on that.

Regards,
Keerthy
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