Re: [PATCH v2 3/6] arm64: dts: ti: k3-pinctrl: Add WKUP_EN flag

[Markus Schneider-Pargmann]

Hi Nishanth,

On Tue, Jul 30, 2024 at 07:09:58AM GMT, Nishanth Menon wrote:
> On 10:00-20240729, Markus Schneider-Pargmann wrote:
> > WKUP_EN is a flag to enable pin wakeup. Any activity will wakeup the SoC
> > in that case.
> > 
> > Signed-off-by: Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>
> > ---
> >  arch/arm64/boot/dts/ti/k3-pinctrl.h | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/ti/k3-pinctrl.h b/arch/arm64/boot/dts/ti/k3-pinctrl.h
> > index 22b8d73cfd32..dd4d53e8420a 100644
> > --- a/arch/arm64/boot/dts/ti/k3-pinctrl.h
> > +++ b/arch/arm64/boot/dts/ti/k3-pinctrl.h
> > @@ -12,6 +12,7 @@
> >  #define PULLTYPESEL_SHIFT	(17)
> >  #define RXACTIVE_SHIFT		(18)
> >  #define DEBOUNCE_SHIFT		(11)
> > +#define WKUP_EN_SHIFT		(29)
> >  
> >  #define PULL_DISABLE		(1 << PULLUDEN_SHIFT)
> >  #define PULL_ENABLE		(0 << PULLUDEN_SHIFT)
> > @@ -38,6 +39,8 @@
> >  #define PIN_DEBOUNCE_CONF5	(5 << DEBOUNCE_SHIFT)
> >  #define PIN_DEBOUNCE_CONF6	(6 << DEBOUNCE_SHIFT)
> >  
> > +#define WKUP_EN			(1 << WKUP_EN_SHIFT)
> > +
> 
> Are we using this?

Yes, this needs to be used in pinctrl for the relevant pins. The users
are not part of this series, as it will probably be in devicetree
overlays or maybe future board files.

This is an example configuration for mcu_mcan0 that is required to
enable support for wakeup from Partial-IO:

  &mcu_pmx0 {
    mcu_mcan0_tx_pins_default: mcu-mcan0-tx-pins-default {
      pinctrl-single,pins = <
        AM62X_IOPAD(0x034, PIN_OUTPUT, 0) /* (D6) MCU_MCAN0_TX */
      >;
    };

    mcu_mcan0_rx_pins_default: mcu-mcan0-rx-pins-default {
      pinctrl-single,pins = <
        AM62X_IOPAD(0x038, PIN_INPUT, 0) /* (B3) MCU_MCAN0_RX */
      >;
    };

    mcu_mcan0_rx_pins_wakeup: mcu-mcan0-rx-pins-wakeup {
      pinctrl-single,pins = <
        AM62X_IOPAD(0x038, PIN_INPUT | WKUP_EN, 0) /* (B3) MCU_MCAN0_RX */
      >;
    };
  };

  &mcu_mcan0 {
    pinctrl-names = "default", "wakeup";
    pinctrl-0 = <&mcu_mcan0_tx_pins_default>, <&mcu_mcan0_rx_pins_default>;
    pinctrl-1 = <&mcu_mcan0_tx_pins_default>, <&mcu_mcan0_rx_pins_wakeup>;
    status = "okay";
  };

Best
Markus