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SubjectRe: [PATCH v2 3/5] regulator: helper routine to extract regulator_init_data
On Thu, Oct 20, 2011 at 10:48:58AM +0530, Rajendra Nayak wrote:
> >Let's look at mc13892-regulator driver. There are 23 regulators defined
> >in array mc13892_regulators. Needless to say, there is a dev behind
> >mc13892-regulator driver. And when getting probed, this driver will
> >call regulator_register() to register those 23 regulators individually.
> >That said, for non-dt world, we have 1 + 23 'dev' with that 1 as the
> >parent of all other 23 'dev' (wrapped by regulator_dev). But with the
> >current DT implementation, we will have at least 1 + 23 * 2 'dev'.
> >These extra 23 'dev' is totally new with DT.
> >
>
> but thats only because the mc13892-regulator driver is implemeted in
> such a way that all the regulators on the platform are bundled in as
> *one* device.

I did not look into too many regulator drivers, but I expect this is
way that most regulator drivers are implemented in. Having
mc13892-regulator being probed 23 times to register these 23 regulators
just makes less sense to me.

> It would again depend on how you would pass these from
> the DT, if you indeed stick to the same way of bundling all regulators
> as one device from DT, the mc13892-regulator probe would just get called
> once and there would be one device associated, no?
>
Yes, I indeed would stick to the same way of bundling the registration
of all regulators with mc13892-regulator being probed once. The problem
I have with the current regulator core DT implementation is that it
assumes the device_node of rdev->dev (dev wrapped in regulator_dev) is
being attached to rdev->dev.parent rather than itself. Back to
mc13892-regulator example, that said, it requires the dev of
mc13892-regulator have the device_node of individual regulator attached
to. IOW, the current implementation forces mc13892-regulator to be
probed 23 times to register those 23 regulators. This is wrong to me.

--
Regards,
Shawn



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