Re: [PATCH v8 07/34] clk: tegra: Support runtime PM and power domain

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



20.08.2021 16:08, Ulf Hansson пишет:
...
>> I suppose if there's really no good way of doing this other than
>> providing a struct device, then so be it. I think the cleaned up sysfs
>> shown in the summary above looks much better than what the original
>> would've looked like.
>>
>> Perhaps an additional tweak to that would be to not create platform
>> devices. Instead, just create struct device. Those really have
>> everything you need (.of_node, and can be used with RPM and GENPD). As I
>> mentioned earlier, platform device implies a CPU-memory-mapped bus,
>> which this clearly isn't. It's kind of a separate "bus" if you want, so
>> just using struct device directly seems more appropriate.
> 
> Just a heads up. If you don't use a platform device or have a driver
> associated with it for probing, you need to manage the attachment to
> genpd yourself. That means calling one of the dev_pm_domain_attach*()
> APIs, but that's perfectly fine, ofcourse.
> 
>>
>> We did something similar for XUSB pads, see drivers/phy/tegra/xusb.[ch]
>> for an example of how that was done. I think you can do something
>> similar here.

We need a platform device because we have a platform device driver that
must be bound to the device, otherwise PMC driver state won't be synced
since it it's synced after all drivers of devices that reference PMC
node in DT are probed.




[Index of Archives]     [Linux Driver Development]     [Linux Driver Backports]     [DMA Engine]     [Linux GPIO]     [Linux SPI]     [Video for Linux]     [Linux USB Devel]     [Linux Coverity]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [Yosemite Backpacking]
  Powered by Linux