From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Hi All,

This series adds syscon support for the Renesas RZ/T2H and RZ/N2H SoCs
in the CPG/MSSR driver. The CPG/MSSR block on these SoCs is a
multi-function block that integrates several system-level features beyond
clock and reset control, including clock monitoring, write protection,
and peripheral configuration registers.

For the other IP blocks to be configured a syscon support is provided in
the CPG/MSSR driver. This allows other drivers to access the CPG/MSSR
registers via a regmap interface.

Note:
- Patches have been rebased on top of next-20260817 + renesas-dts-for-v7.4 +
  renesas-clk-for-v7.4.
- The WDT driver patches apply on top of series [0].

[0] https://lore.kernel.org/all/20260814191415.2110732-1-prabhakar.mahadev-lad.rj@bp.renesas.com/


v3->v4:
- Dropped DT binding patch that split up the renesas,cpg-mssr.yaml file
- 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

v2->v3:
- Switched to non-RFC patches for the series.
- Added new patch to split out the RZ/T2H CPG binding from the generic
  Renesas CPG/MSSR binding.
- Dropped WDT driver refactor changes from this series. These has be
  submitted in a separate series which makes use of regmap.
- Dropped registers from writeable_readable list.
- Renamed sysc_init to post_init and updated signature to take
  cpg_mssr_pub struct.
- Created a single regmap covering both SYSC register regions
  instead of two separate regmaps.
- Updated commit messages

v1->v2:
https://lore.kernel.org/all/20260702123112.161160-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
- Updated commit message for patch #1
- Made use of for_each_child_of_node_scoped
- Moved sysc_init() to the end of the probe function

v1: https://lore.kernel.org/all/20260511185058.1926869-1-prabhakar.mahadev-lad.rj@bp.renesas.com/

Cheers,
Prabhakar

Lad Prabhakar (7):
  clk: renesas: r9a09g077: Register SYSC regmap
  arm64: dts: renesas: r9a09g077: Adjust CPG register region sizes
  arm64: dts: renesas: r9a09g087: Adjust CPG register region sizes
  dt-bindings: watchdog: renesas,r9a09g057-wdt: Add CPG/MSSR syscon
    support
  watchdog: rzv2h: Add syscon support for WDTDCR
  arm64: dts: renesas: r9a09g077: Use CPG/MSSR syscon for WDTDCR access
  arm64: dts: renesas: r9a09g087: Use CPG/MSSR syscon for WDTDCR access

 .../watchdog/renesas,r9a09g057-wdt.yaml       |  29 +++-
 arch/arm64/boot/dts/renesas/r9a09g077.dtsi    |  28 ++--
 arch/arm64/boot/dts/renesas/r9a09g087.dtsi    |  28 ++--
 drivers/clk/renesas/Kconfig                   |   2 +
 drivers/clk/renesas/r9a09g077-cpg.c           | 140 ++++++++++++++++++
 drivers/clk/renesas/renesas-cpg-mssr.c        |   3 +
 drivers/clk/renesas/renesas-cpg-mssr.h        |   1 +
 drivers/watchdog/Kconfig                      |   1 +
 drivers/watchdog/rzv2h_wdt.c                  |  56 +++++--
 9 files changed, 247 insertions(+), 41 deletions(-)

-- 
2.43.0

Hi Prabhakar,

On Mon, 17 Aug 2026 at 21:25, Prabhakar <prabhakar.csengg@gmail.com> wrote:
> This series adds syscon support for the Renesas RZ/T2H and RZ/N2H SoCs
> in the CPG/MSSR driver. The CPG/MSSR block on these SoCs is a
> multi-function block that integrates several system-level features beyond
> clock and reset control, including clock monitoring, write protection,
> and peripheral configuration registers.
>
> For the other IP blocks to be configured a syscon support is provided in
> the CPG/MSSR driver. This allows other drivers to access the CPG/MSSR
> registers via a regmap interface.

> Lad Prabhakar (7):
>   clk: renesas: r9a09g077: Register SYSC regmap

Thanks, will queue in renesas-clk for v7.4.

>   arm64: dts: renesas: r9a09g077: Adjust CPG register region sizes
>   arm64: dts: renesas: r9a09g087: Adjust CPG register region sizes

Thanks, will queue both in renesas-devel for v7.4.

>   dt-bindings: watchdog: renesas,r9a09g057-wdt: Add CPG/MSSR syscon
>     support

This is now in watchdog-next.

>   watchdog: rzv2h: Add syscon support for WDTDCR
>   arm64: dts: renesas: r9a09g077: Use CPG/MSSR syscon for WDTDCR access
>   arm64: dts: renesas: r9a09g087: Use CPG/MSSR syscon for WDTDCR access

These two have a hard dependency on the first five patches, so they
are postponed.

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

Hi Geert,

On Tue, Sep 8, 2026 at 1:31 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Mon, 17 Aug 2026 at 21:25, Prabhakar <prabhakar.csengg@gmail.com> wrote:
> > This series adds syscon support for the Renesas RZ/T2H and RZ/N2H SoCs
> > in the CPG/MSSR driver. The CPG/MSSR block on these SoCs is a
> > multi-function block that integrates several system-level features beyond
> > clock and reset control, including clock monitoring, write protection,
> > and peripheral configuration registers.
> >
> > For the other IP blocks to be configured a syscon support is provided in
> > the CPG/MSSR driver. This allows other drivers to access the CPG/MSSR
> > registers via a regmap interface.
>
> > Lad Prabhakar (7):
> >   clk: renesas: r9a09g077: Register SYSC regmap
>
> Thanks, will queue in renesas-clk for v7.4.
>
> >   arm64: dts: renesas: r9a09g077: Adjust CPG register region sizes
> >   arm64: dts: renesas: r9a09g087: Adjust CPG register region sizes
>
> Thanks, will queue both in renesas-devel for v7.4.
>
Thank you for picking it up.

> >   dt-bindings: watchdog: renesas,r9a09g057-wdt: Add CPG/MSSR syscon
> >     support
>
> This is now in watchdog-next.
>
> >   watchdog: rzv2h: Add syscon support for WDTDCR
> >   arm64: dts: renesas: r9a09g077: Use CPG/MSSR syscon for WDTDCR access
> >   arm64: dts: renesas: r9a09g087: Use CPG/MSSR syscon for WDTDCR access
>
> These two have a hard dependency on the first five patches, so they
> are postponed.
>
Agreed, once I sort out the series [0] maybe we can take all the WDT
driver changes via renesas-soc due to its hard dependancy.

[0] https://lore.kernel.org/all/20260814191415.2110732-1-prabhakar.mahadev-lad.rj@bp.renesas.com/

Cheers,
Prabhakar