[PATCH v3 4/6] pmdomain: renesas: Add R-Car X5H MDLC driver

[Geert Uytterhoeven]

Hi Philipp,

On Thu, 6 Aug 2026 at 10:13, Philipp Zabel <p.zabel at pengutronix.de> wrote:
> On Mi, 2026-08-05 at 17:20 +0200, Geert Uytterhoeven wrote:
> > Add a minimal Module Controller driver for the R-Car X5H (R8A78000) SoC.
> > For now this just supports the always-on power domains, and dummy module
> > clocks and resets for the serial console (which is enabled by the boot
> > loader).
> >
> > Signed-off-by: Geert Uytterhoeven <geert+renesas at glider.be>
> > ---
> > v3:
> >   - Replace <linux/mod_devicetable.h> by more specific
> >     <linux/device-id/of.h> in v7.2-rc2,
> >   - Add a comment to document only always-on domains are supported,
> >   - Consistently use /* sentinel */ for zero sentinels,
> >   - Drop trailing commas from sentinels,
> >
> > v2:
> >   - Spin off from "pmdomain: renesas: Add R-Car X5H MDLC SCMI remapping
> >     driver",
> >   - Add default support not using SCMI,
> >   - Drop all SCMI remapping support,
> >   - Document use of -1 as a sentinel,
> >   - Rename struct r8a78000_mdlc_info to mdlc_info,
> >   - Print HW IDs in hexadecimal,
> >   - Reduce log level for unsupported MDLC instances from warn to dbg,
> > ---
> >  drivers/pmdomain/renesas/Kconfig         |   4 +
> >  drivers/pmdomain/renesas/Makefile        |   1 +
> >  drivers/pmdomain/renesas/r8a78000-mdlc.c | 330 +++++++++++++++++++++++
> >  drivers/soc/renesas/Kconfig              |   1 +
> >  4 files changed, 336 insertions(+)
> >  create mode 100644 drivers/pmdomain/renesas/r8a78000-mdlc.c
> >
> > diff --git a/drivers/pmdomain/renesas/r8a78000-mdlc.c b/drivers/pmdomain/renesas/r8a78000-mdlc.c
> > new file mode 100644
> > index 0000000000000000..5c8acead7cff9bdd
> > --- /dev/null
> > +++ b/drivers/pmdomain/renesas/r8a78000-mdlc.c
> > @@ -0,0 +1,330 @@
> [...]
> > +#define DEFINE_MDLC_RESET_WRAPPER(op)                                            \
> > +     static int r8a78000_mdlc_ ## op(struct reset_controller_dev *rcdev, \
> > +                                     unsigned long id)                   \
> > +     {                                                                   \
> > +             struct r8a78000_mdlc_priv *priv = rcdev_to_priv(rcdev);     \
> > +                                                                         \
> > +             dev_dbg(priv->dev, "%s: Ignoring\n", __func__);             \
> > +             return 0;                                                   \
> > +     }
> > +
> > +DEFINE_MDLC_RESET_WRAPPER(reset)
> > +DEFINE_MDLC_RESET_WRAPPER(assert)
> > +DEFINE_MDLC_RESET_WRAPPER(deassert)
> > +DEFINE_MDLC_RESET_WRAPPER(status)
> > +
> > +static const struct reset_control_ops r8a78000_mdlc_reset_ops = {
> > +     .reset = r8a78000_mdlc_reset,
> > +     .assert = r8a78000_mdlc_assert,
> > +     .deassert = r8a78000_mdlc_deassert,
> > +     .status = r8a78000_mdlc_status,
>
> Are .reset and .status needed by any consumers?
> I'd leave them -ENOTSUPP otherwise.

.reset is used by a variety of R-Car drivers.
.status is used by the R-Car I2C and PCIe drivers.

So both will be used later.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at 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