On Fri, Oct 22, 2021 at 03:15:59PM -0400, Jim Quinlan wrote: > Each different SOC./board we deal with may present different ways of > making the EP device power on. We are using > an abstraction name "brcm-ep-a" to represent some required regulator > to make the EP work for a specific board. The RC > driver cannot hard code a descriptive name as it must work for all > boards designed by us, others, and third parties. > The EP driver also doesn't know or care about the regulator name, and > this driver is often closed source and often immutable. The EP > device itself may come from Brcm, a third party, or sometimes a competitor. > Basically, we find using a generic name such as "brcm-ep-a-supply" > quite handy and many of our customers embrace this feature. > I know that Rob was initially against such a generic name, but I > vaguely remember him seeing some merit to this, perhaps a tiny bit :-) > Or my memory is shot, which could very well be the case. That sounds like it just shouldn't be a regulator at all, perhaps the board happens to need a regulator there but perhaps it needs a clock, GPIO or some specific sequence of actions. It sounds like you need some sort of quirking mechanism to cope with individual boards with board specific bindings. I'd suggest as a first pass omitting this and then looking at some actual systems later when working out how to support them, no sense in getting the main thing held up by difficult edge cases. > > > + /* This is for Broadcom STB/CM chips only */ > > > + if (pcie->type == BCM2711) > > > + return 0; > > It is a relief that other chips have managed to work out how to avoid > > requiring power. > I'm not sure that the other Broadcom groups have our customers, our > customers' requirements, and the amount and variation of boards that > run our PCIe driver on the SOC. Sure, but equally they might (even if they didn't spot it yet) and in general it's safer to err on the side of describing the hardware so we can use that information later.
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