Hi Daniel,
On Tuesday, January 24, 2017, Daniel Lezcano wrote:
> > > > +early_platform_init("earlytimer", &ostm_timer);
> > > > +subsys_initcall(ostm_init); module_exit(ostm_exit);
> > > > +
> > > > +MODULE_AUTHOR("Chris Brandt");
> > > > +MODULE_DESCRIPTION("Renesas OSTM Timer Driver");
> > > > +MODULE_LICENSE("GPL v2");
> > >
> > > Maybe you can try with builtin_platform ?
> >
> > Good idea. But, now I get a "Section mismatch" during link time so
> > I'll have to figure out why that is.
>
> Mmh, I think it would be more consistent to convert this to:
>
> CLOCKSOURCE_OF_DECLARE(ostm, "renesas,ostm", ostm_init);
>
> The only problem is to get the struct device associated to the of_node
> passed as parameter to ostm_init in order to use the devm_* API.
>
> I think of_find_device_by_node should return the platform_device, then
> pdev->dev. If that works the other drivers will benefit from that to
> pdev->remove all
> the rollback code everywhere.
It was a good idea....but it will not work.
While CLOCKSOURCE_OF_DECLARE is good at putting the driver at the
front of the line for loading, it's too early in boot to detect
a platform_device.
of_find_device_by_node calls bus_find_device. But the first thing that
bus_find_device does is:
if (!bus || !bus->p)
return NULL;
But bus->p=0 so it returns immediately.
Of course changing the code over to:
devm_kzalloc -> devm_kzalloc
devm_ioremap_nocache -> of_io_request_and_map
platform_get_irq -> irq_of_parse_and_map
dev_err -> pr_err
Then things work, but I'm back to managing the rollback code manually.
Any other ideas on how to get the corresponding platform_device for
a DT node?
Chris
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