RE: [PATCH 0/3] Add critical resets support to RZ/G2L SoC family

[Biju Das]

Hi Geert,


> -----Original Message-----
> From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> Sent: 18 March 2026 10:54
> Subject: Re: [PATCH 0/3] Add critical resets support to RZ/G2L SoC family
> 
> Hi Biju,
> 
> On Fri, 6 Mar 2026 at 14:42, Biju <biju.das.au@xxxxxxxxx> wrote:
> > From: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> >
> > Some reset lines must remain deasserted at all times after boot, as
> > asserting them would disable critical system functionality with no
> > owning driver to restore them. This mirrors the existing crit_mod_clks
> > mechanism which protects critical module clocks from being disabled.
> >
> > On RZ/G2L family SoCs, DMA reset to be deasseted for routing some
> > peripheral interrupts to CPU.
> >
> > After a suspend/resume cycle, critical module clocks may be left
> > disabled as the hardware state is not automatically restored. Unlike
> > regular clocks which are re-enabled by their respective drivers,
> > critical clocks (CLK_IS_CRITICAL) have no owning driver to restore
> > them, so the CPG driver must take responsibility for re-enabling them on resume.
> >
> > Biju Das (3):
> >   clk: renesas: rzg2l-cpg: Add support for critical resets
> >   clk: renesas: r9a07g04{3,4}/r9a08g045-cpg: Add critical reset entries
> >   clk: renesas: rzg2l-cpg: Re-enable critical module clocks during
> >     resume
> 
> I assume this series supersedes "[PATCH] clk: renesas: rzg2l: Drop DMA driver dependency for system
> boot"[1]?

Yes, that is correct. The same patch series is now part of [2] as it is boot dependent.

[2] https://lore.kernel.org/all/20260318084151.122674-1-biju.das.jz@xxxxxxxxxxxxxx/


Cheers,
Biju


> 
> [1] https://lore.kernel.org/20260130143456.256813-1-biju.das.jz@xxxxxxxxxxxxxx
> 
> 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