Hi Alan, Rafael, Magnus
Thank you for your reply
> The problem is that the ehci-platform driver currently doesn't know
> anything about clocks or power sources. We need to add that
> information in a generic fashion, somehow. Until that's done, you
> can't really use ehci-platform as your driver.
>
> So for example, if ehci-platform _did_ know about clocks and power
> sources, then before calling usb_add_hcd() you would do:
>
> ehci_platform_enable_clocks_and_power(dev);
> pm_runtime_set_active(&dev->dev);
> pm_runtime_enable(&dev->dev);
>
> But you definitely cannot call pm_runtime_get_aync() or anything
> similar, because the EHCI core resume routine assumes the controller's
> clocks are already running and its power supply is at full power.
>
> Can you figure out a good way to add clock and power information to the
> usb_ehci_pdata structure? Something that will work with a large
> variety of SoC EHCI controllers?
It is possible to power-on on platform setup level
if Rafael and Magnus don't care this style.
Then, I don't need this patch on ehci/ohci driver.
1) power-on on platform setup timing
2) use ehci/ohci driver
the other is that add .power callback on usb_ehci_pdata,
and control all power on this.
-- probe --
if (pdata->power)
pdata->power(xxx, 1)
usb_add_hcd()
-- remove --
usb_remove_hcd()
if (pdata->power)
pdata->power(xxx, 0)
Best regards
---
Kuninori Morimoto
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