Re: [PATCH v3 01/12] dt-bindings: clock: renesas,r9a08g045-vbattb: Document VBATTB

Geert Uytterhoeven
2024-10-10T10:09:02Z

Hi Claudiu,

On Fri, Aug 30, 2024 at 3:02 PM Claudiu <claudiu.beznea@tuxon.dev> wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
>
> The VBATTB IP of the Renesas RZ/G3S SoC controls the clock for RTC,
> the tamper detector and a small general usage memory of 128B. Add
> documentation for it.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> ---
>
> Changes in v3:
> - moved the file to clock dt bindings directory as it is the
> only functionality supported at the moment; the other functionalities
> (tamper detector, SRAM) are offered though register spreaded
> though the address space of the VBATTB IP and not actually
> individual devices; the other functionalities are not
> planned to be supported soon and if they will be I think they
> fit better on auxiliary bus than MFD

The battery-backed-up SRAM could be exported through the
NVMEM framework. I am not sure it offers some way to export the tamper
flag (to indicate it's erased, i.e. empty).

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