Hi Ulf, On Tue, Sep 7, 2021 at 12:36 PM Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote: > On Fri, 3 Sept 2021 at 16:29, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote: > > On Fri, Sep 3, 2021 at 11:19 AM Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote: > > > On Fri, 3 Sept 2021 at 01:04, Saravana Kannan <saravanak@xxxxxxxxxx> wrote: > > > > fw_devlink could end up creating device links for bus only devices. > > > > However, bus only devices don't get probed and can block probe() or > > > > sync_state() [1] call backs of other devices. To avoid this, set up > > > > these devices to get probed by the simple-pm-bus. > > > > > > > > [1] - https://lore.kernel.org/lkml/CAPDyKFo9Bxremkb1dDrr4OcXSpE0keVze94Cm=zrkOVxHHxBmQ@xxxxxxxxxxxxxx/ > > > > Signed-off-by: Saravana Kannan <saravanak@xxxxxxxxxx> > > > > Tested-by: Saravana Kannan <saravanak@xxxxxxxxxx> > > > > > > Again, this looks like a nice solution to the problem. > > > > > > One question though. The Kconfig SIMPLE_PM_BUS, should probably be > > > "default y" - or something along those lines to make sure fw_devlink > > > works as expected. > > > > I would love for SIMPLE_PM_BUS to go away, and all of its functionality > > to be usurped by the standard simple-bus handling. > > > > In the modern world, everything uses power management and Runtime > > PM, and the distinction between "simple-bus" and "simple-pm-bus" > > is purely artificial. > > I think it's not that easy, but maybe I am wrong. > > Today we have an opt-in way of supporting runtime PM (and power > management). In most cases it's up to drivers or subsystem level code > to decide if runtime PM should be enabled for the device. > > Would it really be okay to enable runtime PM for all of them? You're talking about the software policy side. >From my PoV, the issue is that this decision is leaked into DT, through the different compatible values ("simple-pm-bus" vs. "simple-bus"). 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
