Re: [PATCH v4 1/7] clk: renesas: r9a09g077: Register SYSC regmap

On Mon, 17 Aug 2026 at 21:26, Prabhakar <[email protected]> wrote:
> From: Lad Prabhakar <[email protected]>
>
> Register a syscon regmap for the System Controller (SYSC) integrated into
> the RZ/T2H and RZ/N2H CPG block.
>
> Unlike traditional Renesas CPG/MSSR implementations, the RZ/T2H and RZ/N2H
> CPG block also integrates the SYSC, which provides low-power management,
> clock monitoring, write protection and peripheral configuration registers
> shared by multiple drivers.
>
> Implement the RZ/T2H-specific .post_init() callback to create and register
> a syscon regmap covering the SYSC register space using the CPG device node.
> For backward compatibility, return without registering the regmap when the
> mapped resources correspond to older Device Trees that expose only the
> legacy 64 KiB CPG register window.
>
> Signed-off-by: Lad Prabhakar <[email protected]>
> ---
> v3->v4:
> - Dropped RZT2H_SYSC_BASE macro
> - Added array of base pointers to the r9a09g077_sysc_reg struct to
>   support multiple SYSC regions
> - Merged r9a09g077_writeable_readable_sysc0 and
>   r9a09g077_writeable_readable_sysc1 into a single function
>   that checks the SYSC block and offset to determine if the register is
>   readable/writable.
> - Added RZT2H_CPG_REG_SIZE macro
> - Updated r9a09g077_post_init() to call of_address_to_resource() to check
>   the size of the mapped CPG register regions
> - Dropped changes from cpg_mssr_common_init

Reviewed-by: Geert Uytterhoeven <[email protected]>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]

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