linux-kernel - Re: [PATCH V4 2/2] regulator: mt6323: Add support for MT6323 regulator

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Date:	Thu, 28 Jan 2016 19:13:48 +0100
From:	John Crispin <blogic@...nwrt.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	Chen Zhong <chen.zhong@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	HenryC Chen (陳建豪) 
	<HenryC.Chen@...iatek.com>
Subject: Re: [PATCH V4 2/2] regulator: mt6323: Add support for MT6323
 regulator



On 27/01/2016 15:41, Mark Brown wrote:
> On Wed, Jan 27, 2016 at 01:00:59PM +0100, John Crispin wrote:
> 
>> +		/* Constrain board-specific capabilities according to what
>> +		 * this driver and the chip itself can actually do.
>> +		 */
>> +		c = rdev->constraints;
>> +		c->valid_modes_mask |= REGULATOR_MODE_NORMAL |
>> +				       REGULATOR_MODE_STANDBY;
>> +		c->valid_ops_mask |= REGULATOR_CHANGE_MODE;
> 
> No, drivers should *never* enable things that weren't explictly enabled
> by the machine constraints.  This misses the whole point of having
> constraints.  They are there so that the system integrator can enable
> the functionality that is safe on a given board.  
> 
> The comment is also inaccurate, it claims it's imposing constraints but
> in fact it's adding additional permissions.
> 

Hi Mark

would the following two bindings be ok ? I would create patches to add them.

* regulator-allow-mode; or regulator-allow-change-mode;
* regulator-modes = <REGULATOR_MODE_NORMAL REGULATOR_MODE_STANDBY>;

	John