On Mon, Apr 22, 2024 at 12:54 PM Claudiu <claudiu.beznea@xxxxxxxxx> wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
>
> RZ/{G2L, V2L, G3S}-based CPG versions have support for saving extra
> power when clocks are disabled by activating module standby. This is done
> through MSTOP-specific registers that are part of CPG. Each individual
> module has one or more bits associated with one MSTOP register (see table
> "Registers for Module Standby Mode" from HW manuals). Hardware manual
> associates modules' clocks with one or more MSTOP bits. There are 3
> mappings available (identified by researching RZ/G2L, RZ/G3S, RZ/V2L HW
> manuals):
>
> case 1: N clocks mapped to N MSTOP bits (with N={0, ..., X})
> case 2: N clocks mapped to 1 MSTOP bit (with N={0, ..., X})
> case 3: N clocks mapped to M MSTOP bits (with N={0, ..., X}, M={0, ..., Y})
>
> Case 3 has been currently identified on RZ/V2L for the VCPL4 module.
>
> To cover all three cases, the individual platform drivers will provide to
> clock driver MSTOP register offset and associated bits in this register
> as a bitmask and the clock driver will apply this bitmask to proper
> MSTOP register.
>
> The MSTOP was implemented through power domains. Platform-specific clock
> drivers will register an array of type
> struct rzg2l_cpg_pm_domain_init_data, which will be used to instantiate
> properly the power domains.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
> ---
>
> Changes in v2:
s/v2/v4/
> - dropped the pwrdn functionality until it is better understanded;
> at the same time kept the code ready for pwrd being added by keeping
> struct rzg2l_cpg_pm_domain_conf, DEF_REG_CONF(); please let me know
> if you prefer otherwise
> - @Geert, @Ulf: I dropped your previous Rb tags due to dropping pwrdn
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
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
