Hi Shimoda-san,
On Wed, Jul 5, 2017 at 1:57 PM, Yoshihiro Shimoda
<yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote:
>> From: Geert Uytterhoeven
>> Sent: Wednesday, July 5, 2017 7:09 PM
>> On Wed, Jun 28, 2017 at 8:28 AM, Yoshihiro Shimoda
>> <yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote:
>> > R-Car USB 2.0 controller can change the clock source from an oscillator
>> > to an external clock via a register. So, this patch adds support
>> > the clock source selector as a clock driver.
>> > --- /dev/null
>> > +++ b/drivers/clk/renesas/rcar-usb2-clock-sel.c
>> > +/* Since this driver needs other ccf drivers, this uses subsys_initcall_sync */
>> > +subsys_initcall_sync(rcar_usb2_clock_sel_init);
>>
>> I suppose this is a workaround for the lack of probe deferral support in the
>> USB subsystem?
>
> This is my fault. I added "power-domains" property into this device's node.
> After I remove the power-domains like the cpg node, this driver can use subsys_initcall()
> instead of subsys_initcall_sync().
Does the clock sel module requires the functional clock "ehci_ohci" to be
running before you can access its registers?
If yes, I think there should be a "power-domains" property.
Then, you can simplify the code by calling
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
and remove the explicit handling of the functional clock.
That does not solve probe deferral handling in the USB subsystem, though.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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