linux-kernel - Re: [Patch V2] drivers: power: Add support for bq24735 charger

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Date:	Tue, 24 Sep 2013 17:10:19 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Rhyland Klein <rklein@...dia.com>
CC:	Anton Vorontsov <anton@...msg.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Manish Badarkhe <badarkhe.manish@...il.com>,
	Darbha Sriharsha <dsriharsha@...dia.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [Patch V2] drivers: power: Add support for bq24735 charger

On 09/24/2013 10:39 AM, Rhyland Klein wrote:
> On 9/23/2013 6:05 PM, Stephen Warren wrote:
>> On 09/23/2013 04:01 PM, Rhyland Klein wrote:
>>> On 9/23/2013 5:53 PM, Stephen Warren wrote:
>>>> On 09/19/2013 10:18 AM, Rhyland Klein wrote:
>>>>> Adding driver support for bq24735 charger chipset.
>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/power_supply/ti,bq24735.txt b/Documentation/devicetree/bindings/power_supply/ti,bq24735.txt
>>
>>>>> + - ti,charge-current : Used to control and set the charging current. This value
>>>>> +   must follow the below guidelines:
>>>>> +	bit 0 - 5:	Not used
>>>>> +	bit 6:		1 = Adds 64mA of charger current
>>>>> +	bit 7:		1 = Adds 128mA of charger current
>>>>> +	bit 8:		1 = Adds 256mA of charger current
>>>>> +	bit 9:		1 = Adds 512mA of charger current
>>>>> +	bit 10:		1 = Adds 1024mA of charger current
>>>>> +	bit 11:		1 = Adds 2048mA of charger current
>>>>> +	bit 12:		1 = Adds 4096mA of charger current
>>>>> +	bit 13 - 15:	Not used
>>>>
>>>> That's a little odd. Why not just put the number of mA directly into the
>>>> property unshifted?
>>>
>>> This is how the hw register is defined, its the literal number of mA.
>>> This is cleaned up in the upcoming revision.
>>
>> OK. If you still want to use the raw register encoding, which seems
>> reasonable, why not just say:
>>
>> ti,charge-current: Value for charge current register as described in the
>> HW documentation.
> 
> I had written this for v3:
> 
> - ti,charge-current : Used to control and set the charging current. This
> value must be between 128mA and 8.128A with a 64mA step resolution. The
> POR value is 0x0000h. See spec for more details.
> 
> Do you think the range is unnecessary or is it fine?

It's probably fine, although I expect unnecessary. I would mention the
exact register name from the spec, to make searching for it easier.

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