Re: [PATCH 3/6] clk: renesas: r7s9210: Add SPIBSC clock

[Geert Uytterhoeven <geert@linux-m68k.org>]

Hi Chris,

On Tue, Dec 3, 2019 at 8:09 PM Chris Brandt <Chris.Brandt@renesas.com> wrote:
> On Tue, Dec 3, 2019, Geert Uytterhoeven wrote:
> > > +static const unsigned int r7s9210_crit_mod_clks[] __initconst = {
> > > +       MOD_CLK_ID_10(83),      /* SPIBSC */
> >
> > This is only a critical clock if XIP is in use, right?
>
> Correct.
>
>
> > Can we do better, and only mark it critical if we detect the FLASH is used in
> > XIP mode?
> > E.g. by using for_each_compatible_node(..., "mtd-rom"), and checking if any
> > of the corresponding register blocks matches the SPIBSC FLASH memory window?
>
> Well...technically...you don't need the "mtd-rom" partition when using the AXFS
> file system. But, we can make a rule that you have to use it regardless.

Just wondering, how does AXFS access the FLASH without it being mapped
using "mtd-rom"?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

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