在 2024-07-26星期五的 09:38 -0700，Drew Fustini写道： > On Fri, Jul 26, 2024 at 03:45:36AM -0500, Emil Renner Berthing wrote: > > Stephen Boyd wrote: > > > Quoting Drew Fustini (2024-06-23 19:12:31) > > > > Document bindings for the T-Head TH1520 AP sub-system clock > > > > controller. > > > > > > > > Link: > > > > https://openbeagle.org/beaglev-ahead/beaglev-ahead/-/blob/main/docs/TH1520%20System%20User%20Manual.pdf > > > > Co-developed-by: Yangtao Li <frank.li@xxxxxxxx> > > > > Signed-off-by: Yangtao Li <frank.li@xxxxxxxx> > > > > Reviewed-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> > > > > Signed-off-by: Drew Fustini <dfustini@xxxxxxxxxxxxxxx> > > > > --- > > > > > > Applied to clk-next > > > > Thanks, but this driver seems a bit incomplete. With this applied > > the Lichee Pi > > 4A no longer boots without the clk_ignore_unused kernel parameter. > > > > /Emil > > Is this the case when you apply the dts patches from this series? > > The dts patches won't go in until 6.12 so I don't think the presence > of > the clk-th1520-ap.c itself in 6.11 would break existing systems. > > That said, I have been using clk_ignore_unused. I had been thinking > that > made sense because the full set of clock controller drivers like > AON_SUBSYS (always on), AUDIO_SUBSYS, DSP_SUBSYS, etc, are not > present > yet in mainline. However, the T-Head vendor kernel does have drivers > for > all those clock controllers and I was suprised to see that the vendor > kernel fails to boot when I just tested removing clk_ignore_unused. > > As for clk-th1520-ap.c in mainline, I'll investigate further which > clk > disables seem to causing the boot failure when using the dts from > this > series. I suspect I may need to add nodes that will cause the > necessary > clks to be enabled by their respective drivers. If disabling the clock just leads to system hang, setting CLK_IS_CRITICAL should be useful (and needed) here. > > Thanks, > Drew > > _______________________________________________ > linux-riscv mailing list > linux-riscv@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-riscv
