linux-kernel - Re: [PATCH 2/2] regulator: tps80031: add regulator driver for tps80031

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Message-ID: <5097AA42.8090407@nvidia.com>
Date:	Mon, 5 Nov 2012 17:30:02 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"lrg@...com" <lrg@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] regulator: tps80031: add regulator driver for tps80031

Thanks for quickest review.

On Monday 05 November 2012 04:12 PM, Mark Brown wrote:
> * PGP Signed by an unknown key
>
> On Mon, Nov 05, 2012 at 03:14:18PM +0530, Laxman Dewangan wrote:
>
>> +	switch (ri->device_flags) {
>> +	case 0:
> Should we be using different versions of the ops depending on the device
> flags rather than having these switches?  It seems like we can't change
> at runtime and it would make the code a lot simpler.

I have single dcdc ops for all DCDC VIO, SMPS1 to 3.
There is different configuration bit for selecting any DCDC to normal, 
extended or offset. As this ops are share, I can not change the callbacks.
However, I rewrite this apis using tables and equation to reduce code size.

> Why the + 1 (and - 1 in the get()).  I'd expect we can just use the
> register value directly as a selector.

The device sets vout = 0 if vsel = 0 and then equation talk about the 
Vmin + vsel * step.
I exported the Vout minimum as Vmin for sel = 0 and hence this is there.

I will export this in true equation in my next patch.

>> +	if (!(ri->config_flags&  VBUS_SW_ONLY)) {
>> +		dev_err(&rdev->dev, "%s() is not supported with flag 0x%08x\n",
>> +			 __func__, ri->config_flags);
>> +		return -EIO;
>> +	}
> Same as the device flags above - we should this be set by changing the
> ops when we register?

Ok, so I will have two ops, hw (empty) and sw(implemented). If sw is 
selected then only sw ops will get initialized and so it will not need 
any checks.

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