linux-kernel - Re: [PATCH] Add ltc3562 voltage regulator driver

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Date:	Thu, 30 Oct 2014 11:53:37 +0100
From:	Mike Looijmans <mike.looijmans@...ic.nl>
To:	Mark Brown <broonie@...nel.org>
CC:	<lgirdwood@...il.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Add ltc3562 voltage regulator driver

On 10/30/2014 11:29 AM, Mike Looijmans wrote:
> On 10/30/2014 11:15 AM, Mark Brown wrote:
>> On Thu, Oct 30, 2014 at 07:47:44AM +0100, Mike Looijmans wrote:
>>> On 10/29/2014 01:30 PM, Mark Brown wrote:
>>
>>>> A couple of problems here:
>>
>>>>   - This contains DT code but no DT bindings documentation; the binding
>>>>     documentation is mandatory for any new bindings.
>>
>>> Should I submit a new patch to add the DT bindings and CC to the dt mailing
>>> list, or do you want it included in this patch? I was basically waiting for
>>> feedback on the driver first.
>>
>> I'm not going to review a driver with bindings without those bindings
>> being documented, it's a well documented requirement and apart from
>> anything else it's not really possible to review the code that manages
>> the bindings without seeing the bindings.
>>
>>> The "default voltage" may not be device specific, but regulator.txt doesn't
>>> have a property that describes what we needed here, because we can't get
>>> away with specifying min=max as fixed-regulator does. We also cannot assume
>>> that default=min or default=max, because that might harm hardware connected
>>> to the other side of the IO bank.
>>
>> No, if you need a generic property add it in the generic code rather
>> than just hacking a device specific property into your driver.
>
> So I should add "regulator-default-voltage" to the generic code? That would
> indeed be better than trying to do it into this driver.
>
> But would that need a separate patch for regulator core to add the property?

Hmm, I looked into doing that, but that isn't trivial, and too many devices 
will suffer.

Since default-voltage is unacceptable, I will remove it from the ltc3562 
driver and just use the min==max setting in the devicetree to reach the same 
effect. The driver that will match IO voltages between SOM and carrier is far 
from being ready for submission anyway.

I'll submit a v2 patch with all these things reworked soon.

Mike.


Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


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