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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