Re: [PATCH v4 3/3] riscv: dts: spacemit: add pinctrl property to uart0 in BPI-F3

[Jesse T <mr.bossman075@xxxxxxxxx>]

On Sun, Sep 15, 2024 at 10:45 PM Yixun Lan <dlan@xxxxxxxxxx> wrote:
>
> Hi Jesse
>
> On 10:45 Sun 15 Sep     , Jesse Taube wrote:
> >
> > Before pinctrl driver implemented, the uart0 controller reply on
> > bootloader for setting correct pin mux and configurations.
> >
> > Now, let's add pinctrl property to uart0 of Bananapi-F3 board.
> >
> > Signed-off-by: Yixun Lan <dlan@xxxxxxxxxx>
> > ---
> >   arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts |  3 +++
> >   arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi    | 20 ++++++++++++++++++++
> >   arch/riscv/boot/dts/spacemit/k1.dtsi            |  5 +++++
> >   3 files changed, 28 insertions(+)
> >
> > diff --git a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
> > b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
> > index 023274189b492..bc88d4de25a62 100644
> > --- a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
> > +++ b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
> > @@ -4,6 +4,7 @@
> >    */
> >
> >   #include "k1.dtsi"
> > +#include "k1-pinctrl.dtsi"
> >
> >   / {
> >       model = "Banana Pi BPI-F3";
> > @@ -15,5 +16,7 @@ chosen {
> >   };
> >
> >   &uart0 {
> > +     pinctrl-names = "default";
> > +     pinctrl-0 = <&uart0_2_cfg>;
> >       status = "okay";
> >   };
> > diff --git a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
> > b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
> > new file mode 100644
> > index 0000000000000..a8eac5517f857
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
> > @@ -0,0 +1,20 @@
> > +// SPDX-License-Identifier: GPL-2.0 OR MIT
> > +/*
> > + * Copyright (c) 2024 Yixun Lan <dlan@xxxxxxxxxx>
> > + */
> > +
> > +#include <dt-bindings/gpio/gpio.h>
> > +
> > +#define K1_PADCONF(pin, func) (((pin) << 16) | (func))
> >
> > It would be nice to have a pinfunc header like
> > arch/arm/boot/dts/nxp/imx/imx7ulp-pinfunc.h.
> > It would reference and encode the data of "3.2 Pin Multiplex" in
> > https://developer.spacemit.com/documentation?token=An1vwTwKaigaXRkYfwmcznTXned
> > , the document you attached in the summary.
> Not sure if it's worth the effort..

I can send a future patch for this.

>
> I gave up of introducing another macro, as it's exactly one to one mapping to
> GPIO ID, which mean pin(x) -> GPIO_x
>
> maybe I could put a comment at K1_PADCONF() to document this?

I'm weary the Manual may not exist on the site in the future or
will change formats. But it would be nice otherwise.

>
> /* pin is same to the GPIO id according to 3.2 Pin Multiplex of User Manual */
> #define K1_PADCONF(pin, func) (((pin) << 16) | (func))
>
> does this sound good to you?

Sure, add it.

Also sorry for messing up the reply-to thing thunderbird is confusing.

Thanks,
Jesse Taube

>
> >
> > Otherwise,
> > Acked-by: Jesse Taube <Mr.Bossman075@xxxxxxxxx>
> >
> thanks
>
> > +
> > +&pinctrl {
> > +     uart0_2_cfg: uart0-2-cfg {
> > +             uart0-2-pins {
> > +                     pinmux = <K1_PADCONF(68, 2)>,
> > +                              <K1_PADCONF(69, 2)>;
> > +
> > +                     bias-pull-up = <0>;
> > +                     drive-strength = <32>;
> > +             };
> > +     };
> > +};
> > diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi
> > b/arch/riscv/boot/dts/spacemit/k1.dtsi
> > index 0777bf9e01183..a2d5f7d4a942a 100644
> > --- a/arch/riscv/boot/dts/spacemit/k1.dtsi
> > +++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
> > @@ -416,6 +416,11 @@ uart9: serial@d4017800 {
> >                       status = "disabled";
> >               };
> >
> > +             pinctrl: pinctrl@d401e000 {
> > +                     compatible = "spacemit,k1-pinctrl";
> > +                     reg = <0x0 0xd401e000 0x0 0x400>;
> > +             };
> > +
> >               plic: interrupt-controller@e0000000 {
> >                       compatible = "spacemit,k1-plic", "sifive,plic-1.0.0";
> >                       reg = <0x0 0xe0000000 0x0 0x4000000>;
> >
> > --
> > 2.45.2
>
> --
> Yixun Lan (dlan)
> Gentoo Linux Developer
> GPG Key ID AABEFD55