linux-kernel - Re: [RFT v3 06/14] regulator: max77802: Remove support for board files

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Date:	Thu, 30 Oct 2014 13:30:35 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>
Subject: Re: [RFT v3 06/14] regulator: max77802: Remove support for board files

On czw, 2014-10-30 at 13:21 +0100, Javier Martinez Canillas wrote:
> Hello Krzysztof,
> 
> On 10/30/2014 01:10 PM, Krzysztof Kozlowski wrote:
> >> 
> >> I may be missing something but I don't understand why a compatible string
> >> for the regulators sub-node is needed. Isn't enough to just fill the
> >> .regulators_node field in the struct regulator_desc? e.g:
> >> 
> >>     .regulators_node = of_match_ptr("regulators") for max77802
> >>     .regulators_node = of_match_ptr("voltage-regulators") for max77686
> >> 
> >> AFAIU this should be enough for the core to extract the init_data and will
> >> make your change much more simpler and you can drop patches 1-3 and 13-14.
> >> 
> >> Or maybe I misread the regulator_of_get_init_data() function?
> > 
> > The regulator_of_get_init_data() searches from dev->of_node or its child
> > node.
> > 
> > But dev->of_node is NULL.
> > 
> > That's why of_compatible is needed.
> 
> Yes but regulator_register() does dev = config->dev and config->dev is set
> to config.dev = iodev->dev in the driver probe function which is the
> pdev->dev.parent (the PMIC struct device) that has an associated of_node.
> 
> So, regulator_of_get_init_data() will call of_get_child_by_name() passing
> the PMIC of_node and the sub-node name that contains the regulators. That
> is, whatever was set in desc->regulators_node and that should be enough.

I missed that one in max77802 (in max77686: config.dev = &pdev->dev).
Now I wonder if it is proper to attach regulators to driver's parent
device. Consider regulator_register, around line 3640:
	rdev->dev.parent = dev;
The parent of regulators will be equal to parent of regulator driver -
main MFD driver.

Best regards,
Krzysztof


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