Re: [PATCH v4 2/6] mfd: bd71837: Devicetree bindings for ROHM BD71837 PMIC

Matti Vaittinen
2018-06-01T10:51:15Z

On Thu, May 31, 2018 at 07:57:53AM -0700, Stephen Boyd wrote:
> Quoting Rob Herring (2018-05-31 07:07:24)
> > On Thu, May 31, 2018 at 5:23 AM, Matti Vaittinen
> > <mazziesaccount@gmail.com> wrote:
> > > On Thu, May 31, 2018 at 10:17:17AM +0300, Matti Vaittinen wrote:
> > >> Hello Rob,
> > >>
> > >> Thanks for the review!
> > >>
> > >> On Wed, May 30, 2018 at 10:01:29PM -0500, Rob Herring wrote:
> > >> > On Wed, May 30, 2018 at 11:42:03AM +0300, Matti Vaittinen wrote:
> > >> > > Document devicetree bindings for ROHM BD71837 PMIC MFD.
> > >> > > + - interrupts : The interrupt line the device is connected to.
> > >> > > + - interrupt-controller : Marks the device node as an interrupt controller.
> > >> >
> > >> > What sub blocks have interrupts?
> > >>
> > >> The PMIC can generate interrupts from events which cause it to reset.
> > >> Eg, irq from watchdog line change, power button pushes, reset request
> > >> via register interface etc. I don't know any generic handling for these
> > >> interrupts. In "normal" use-case this PMIC is powering the processor
> > >> where driver is running and I do not see reasonable handling because
> > >> power-reset is going to follow the irq.
> > >>
> > >
> > > Oh, but when reading this I understand that the interrupt-controller
> > > property should at least be optional.
> >
> > I don't think it should. The h/w either has an interrupt controller or
> > it doesn't. My concern is you added it but nothing uses it which tells
> > me your binding is incomplete. I'd rather see complete bindings even
> > if you don't have drivers. For example, as-is, there's not really any
> > need for the clocks child node. You can just make the parent a clock
> > provider. But we need a complete picture of the h/w to make that
> > determination.
> >
>
> I don't see a reason to have the clk subnode either.

After some pondering - do you mean I could:
1. remove clk binfing document and clk node.
2. add clock-output-names etc to pmic node (and describe them in pmic
node binding document)
3. use parent DT node in clk driver and do something like:
if (parent->of_node)
ret = of_clk_add_hw_provider(parent->of_node, of_clk_hw_simple_get,
hw);
4. remove the clkdev

I will cook new set of patches with all suggested changes but it may be I don't
get it ready for posting untill next week.

Br,
Matti Vaittinen