[PATCH] pinctrl: sunxi: A523: fix voltage withstand encoding

[Chen-Yu Tsai]

On Fri, Sep 11, 2026 at 4:14 AM Andre Przywara <andre.przywara at arm.com> wrote:
>
> On Thu, 23 Jul 2026 01:26:38 +0800
> Chen-Yu Tsai <wens at kernel.org> wrote:
>
> Hi,
>
> > On Wed, Jul 22, 2026 at 6:43 AM Andre Przywara <andre.przywara at arm.com> wrote:
> > >
> > > The Allwinner A523 uses the same GPIO voltage "withstand" programming
> > > (setting the input level voltage thresholds) as the previous SoCs, but
> > > for some odd reason inverts the encoding of 1.8V vs. 3.3V.
> > >
> > > Add a new bias voltage type to note this difference, and select it for
> > > the A523. At the same time also use the newer "CTL" version, which in
> > > addition allows to turn off the withstand programming for I/O voltages
> > > other than exact 1.8V or 3.3V (for instance for 2.5V sometimes used for
> > > Ethernet PHYs). The A523 has that enable register, but didn't use it
> > > so far.
> > >
> > > This fixes eMMC and reportedly Ethernet operation on some A523 boards.
> > >
> > > Fixes: 648be4cd9517 ("pinctrl: sunxi: Add support for the Allwinner A523")
> > > Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> >
> >
> > Reviewed-by: Chen-Yu Tsai <wens at kernel.org>
> > Tested-by: Chen-Yu Tsai <wens at kernel.org> # Fixes eMMC on Orange Pi 4A
>
> so what happens to this fix? Is it good to be merged? And who is going
> to take this? Linus? Or does it go through sunxi?

Linus needs to take this. It seems you didn't send it to him, nor the
linux-gpio mailing list?

Can you resend?

> Cheers,
> Andre
>
> > > ---
> > >  drivers/pinctrl/sunxi/pinctrl-sun55i-a523-r.c | 2 +-
> > >  drivers/pinctrl/sunxi/pinctrl-sun55i-a523.c   | 2 +-
> > >  drivers/pinctrl/sunxi/pinctrl-sunxi.c         | 6 ++++++
> > >  drivers/pinctrl/sunxi/pinctrl-sunxi.h         | 2 ++
> > >  4 files changed, 10 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/pinctrl/sunxi/pinctrl-sun55i-a523-r.c b/drivers/pinctrl/sunxi/pinctrl-sun55i-a523-r.c
> > > index dfdcfa740ecc9..cffc1e53eef14 100644
> > > --- a/drivers/pinctrl/sunxi/pinctrl-sun55i-a523-r.c
> > > +++ b/drivers/pinctrl/sunxi/pinctrl-sun55i-a523-r.c
> > > @@ -26,7 +26,7 @@ static const u8 a523_r_irq_bank_muxes[SUNXI_PINCTRL_MAX_BANKS] =
> > >  static struct sunxi_pinctrl_desc a523_r_pinctrl_data = {
> > >         .irq_banks = ARRAY_SIZE(a523_r_irq_bank_map),
> > >         .irq_bank_map = a523_r_irq_bank_map,
> > > -       .io_bias_cfg_variant = BIAS_VOLTAGE_PIO_POW_MODE_SEL,
> > > +       .io_bias_cfg_variant = BIAS_VOLTAGE_PIO_POW_MODE_CTL_INV,
> > >         .pin_base = PL_BASE,
> > >  };
> > >
> > > diff --git a/drivers/pinctrl/sunxi/pinctrl-sun55i-a523.c b/drivers/pinctrl/sunxi/pinctrl-sun55i-a523.c
> > > index 801f62abc93df..001bd42afa3ef 100644
> > > --- a/drivers/pinctrl/sunxi/pinctrl-sun55i-a523.c
> > > +++ b/drivers/pinctrl/sunxi/pinctrl-sun55i-a523.c
> > > @@ -26,7 +26,7 @@ static const u8 a523_irq_bank_muxes[SUNXI_PINCTRL_MAX_BANKS] =
> > >  static struct sunxi_pinctrl_desc a523_pinctrl_data = {
> > >         .irq_banks = ARRAY_SIZE(a523_irq_bank_map),
> > >         .irq_bank_map = a523_irq_bank_map,
> > > -       .io_bias_cfg_variant = BIAS_VOLTAGE_PIO_POW_MODE_SEL,
> > > +       .io_bias_cfg_variant = BIAS_VOLTAGE_PIO_POW_MODE_CTL_INV,
> > >  };
> > >
> > >  static int a523_pinctrl_probe(struct platform_device *pdev)
> > > diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> > > index cabcb8b6f38e5..634d9f1f23947 100644
> > > --- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> > > +++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> > > @@ -718,6 +718,7 @@ static int sunxi_pinctrl_set_io_bias_cfg(struct sunxi_pinctrl *pctl,
> > >  {
> > >         unsigned short bank;
> > >         unsigned long flags;
> > > +       bool inverted = false;
> > >         u32 val, reg;
> > >         int uV;
> > >
> > > @@ -757,6 +758,9 @@ static int sunxi_pinctrl_set_io_bias_cfg(struct sunxi_pinctrl *pctl,
> > >                 writel(reg | val, pctl->membase +
> > >                        sunxi_grp_config_reg(pctl, pin));
> > >                 return 0;
> > > +       case BIAS_VOLTAGE_PIO_POW_MODE_CTL_INV:
> > > +               inverted = true;
> > > +               fallthrough;
> > >         case BIAS_VOLTAGE_PIO_POW_MODE_CTL:
> > >                 val = uV > 1800000 && uV <= 2500000 ? BIT(bank) : 0;
> > >
> > > @@ -771,6 +775,8 @@ static int sunxi_pinctrl_set_io_bias_cfg(struct sunxi_pinctrl *pctl,
> > >                 fallthrough;
> > >         case BIAS_VOLTAGE_PIO_POW_MODE_SEL:
> > >                 val = uV <= 1800000 ? 1 : 0;
> > > +               if (inverted)
> > > +                       val = !val;
> > >
> > >                 raw_spin_lock_irqsave(&pctl->lock, flags);
> > >                 reg = readl(pctl->membase + pctl->pow_mod_sel_offset);
> > > diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.h b/drivers/pinctrl/sunxi/pinctrl-sunxi.h
> > > index d0936a32123ba..2c8648c3301b6 100644
> > > --- a/drivers/pinctrl/sunxi/pinctrl-sunxi.h
> > > +++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.h
> > > @@ -128,8 +128,10 @@ enum sunxi_desc_bias_voltage {
> > >          * Bias voltage is set through PIO_POW_MOD_SEL_REG
> > >          * and PIO_POW_MOD_CTL_REG register, as seen on
> > >          * A100 and D1 SoC, for example.
> > > +        * Some SoCs invert the encoding for 1.8V vs. 3.3V.
> > >          */
> > >         BIAS_VOLTAGE_PIO_POW_MODE_CTL,
> > > +       BIAS_VOLTAGE_PIO_POW_MODE_CTL_INV,
> > >  };
> > >
> > >  struct sunxi_desc_function {
> > > --
> > > 2.46.4
> > >
> >
>