On Thu, Jul 08, 2021 at 02:37:44PM +0300, Dmitry Baryshkov wrote: > Hi, > > On Thu, 8 Jul 2021 at 13:10, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote: > > > > - Peter (the email was bouncing) > > + Peter's kernel.org address > > > > > On Tue, 6 Jul 2021 at 13:55, Mark Brown <broonie@xxxxxxxxxx> wrote: > > > > > > On Tue, Jul 06, 2021 at 09:54:03AM +0200, Ulf Hansson wrote: > > > > On Tue, 22 Jun 2021 at 00:32, Dmitry Baryshkov > > > > > > > > Qualcomm QCA6390/1 is a family of WiFi + Bluetooth SoCs, with BT part > > > > > being controlled through the UART and WiFi being present on PCIe > > > > > bus. Both blocks share common power sources. Add device driver handling > > > > > power sequencing of QCA6390/1. > > > > > > > Power sequencing of discoverable buses have been discussed several > > > > times before at LKML. The last attempt [1] I am aware of, was in 2017 > > > > from Peter Chen. I don't think there is a common solution, yet. > > > > > > This feels a bit different to the power sequencing problem - it's not > > > exposing the individual inputs to the device but rather is a block that > > > manages everything but needs a bit of a kick to get things going (I'd > > > guess that with ACPI it'd be triggered via AML). It's in the same space > > > but it's not quite the same issue I think, something that can handle > > > control of the individual resources might still struggle with this. > > > > Well, to me it looks very similar to those resouses we could manage > > with the mmc pwrseq, for SDIO. It's also typically the same kind of > > combo-chips that moved from supporting SDIO to PCIe, for improved > > performance I guess. More importantly, the same constraint to > > pre-power on the device is needed to allow it to be discovered/probed. > > In our case we'd definitely use pwrseq for PCIe bus and we can also > benefit from using pwrseq for serdev and for platform busses also (for > the same story of WiFi+BT chips). > > I can take a look at rewriting pwrseq code to also handle the PCIe > bus. Rewriting it to be a generic lib seems like an easy task, > plugging it into PCIe code would be more fun. > > Platform and serdev... Definitely even more fun. I don't want to see pwrseq (the binding) expanded to other buses. If that was the answer, we wouldn't be having this discussion. It was a mistake for MMC IMO. If pwrseq works as a kernel library/api, then I have no issue with that. > > > Therefore, I think it would be worth having a common solution for > > this, rather than a solution per subsystem or even worse, per device. Power sequencing requirements are inheritently per device unless we're talking about standard connectors. This is a solved problem on MDIO. It's quite simple. If there's a DT node for a device you haven't discovered, then probe it anyways. Rob
