Hi Jürg, On Mon, Apr 25, 2016 at 2:24 PM, Jürg Billeter <j@xxxxxxxxx> wrote: > testing 4.6-rc5 on a custom R-Car H3 board, I noticed that the Linux > console attached to SCIF2 no longer works (it works on 4.5). earlycon > works fine, though. Unlike Salvator-X, this H3 board does not use an > external SCIF clock and thus, scif_clk is not enabled in the board > device tree. > > The first "bad" commit is > commit 3e5dd6f6e690048d0fd1c913397506648724474e > Author: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> > Date: Fri Feb 26 16:54:31 2016 +0100 > > clk: Ignore disabled DT clock providers > > As far as I can tell, the issue is that, with the above commit, > devm_clk_get() returns -EPROBE_DEFER for disabled clocks and the sh-sci > driver aborts probing with -EPROBE_DEFER even though scif_clk is > optional. > > I can work around this issue with the patch below but I'm not sure > about the correct fix. Intuitively, I would expect devm_clk_get() to > return -ENOENT instead of -EPROBE_DEFER for disabled clocks but I don't > know whether this can be changed in the common clock framework without > risking issues in other places. > > What do you think is the best solution to this issue? The real issue is that scif_clk in r8a7795.dtsi should not be marked disabled. Cfr. "ARM: dts: r8a7791: Don't disable referenced optional clocks" https://git.kernel.org/cgit/linux/kernel/git/horms/renesas.git/commit/?h=fixes-for-v4.6&id=ac6908b3049397b10bcfd8143d79cbdbbd266f02 Will fix and send patches for all other affected SoCs... 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 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
