Re: [PATCH v2 3/4] arm64: dts: nuvoton: Add pinctrl support for ma35d1

[Jacky Huang]

Dear Krzysztof,


On 2023/11/29 下午 06:54, Krzysztof Kozlowski wrote:
> On 29/11/2023 11:14, Jacky Huang wrote:
> > Dear Krzysztof,
> >
> >
> > On 2023/11/29 下午 06:02, Krzysztof Kozlowski wrote:
> > > On 29/11/2023 10:41, Jacky Huang wrote:
> > > > Dear Krzysztof,
> > > >
> > > >
> > > > On 2023/11/29 下午 04:11, Krzysztof Kozlowski wrote:
> > > > > On 29/11/2023 04:35, Jacky Huang wrote:
> > > > > > > > > Best regards,
> > > > > > > > > Krzysztof
> > > > > > > > Yes, it did pass the 'dtbs_check'. I guess the tool does not detect such
> > > > > > > > issues.
> > > > > > > > Anyway, I will fix it in the next version.
> > > > > > > Hm, I see your bindings indeed allow pin-.* and unit addresses, so it is
> > > > > > > the binding issue.
> > > > > > >
> > > > > > > The examples you used as reference - xlnx,zynqmp-pinctrl.yaml and
> > > > > > > realtek,rtd1315e-pinctrl.yaml - do not mix these as you do.
> > > > > > >
> > > > > > > I don't understand why do you need them yet. I don't see any populate of
> > > > > > > children. There are no compatibles, either.
> > > > > > >
> > > > > > > Which part of your driver uses them exactly?
> > > > > > >
> > > > > > > Best regards,
> > > > > > > Krzysztof
> > > > > > I will move the 'pcfg_default: pin-default' from dtsi to dts, like this:
> > > > > >
> > > > > > &pinctrl {
> > > > > >         pcfg_default: pin-default {
> > > > > >             slew-rate = <0>;
> > > > > >             input-schmitt-disable;
> > > > > >             bias-disable;
> > > > > >             power-source = <1>;
> > > > > >             drive-strength = <17100>;
> > > > > >         };
> > > > > This solves nothing. It's the same placement.
> > > > >
> > > > >
> > > > > Best regards,
> > > > > Krzysztof
> > > > OK, it stil be the binding issues.
> > > > For "^pin-[a-z0-9]+$", I reference to the "pcfg-[a-z0-9-]+$" of
> > > > rockchip,pinctrl.yaml.
> > > >
> > > > My intention is to describe a generic pin configuration, aiming to make
> > > > the pin
> > > > description more concise. In actual testing, it proves to be effective.
> > > Can you instead respond to my actual questions?
> > >
> > > Best regards,
> > > Krzysztof
> > The the last one item of nuvoton,pins is a phandle, which can refer to
> > '&pin-default'. The following code of driver pinctrl-ma35.c parse
> > "nuvoton,pins", including the node reference by phandle. list =
> > of_get_property(np, "nuvoton,pins", &size); size /= sizeof(*list); if
> > (!size || size % 4) { dev_err(npctl->dev, "wrong setting!\n"); return
> > -EINVAL; } grp->npins = size / 4; grp->pins = devm_kzalloc(npctl->dev,
> > grp->npins * sizeof(*grp->pins), GFP_KERNEL); if (!grp->pins) return
> > -ENOMEM; pin = grp->settings = devm_kzalloc(npctl->dev, grp->npins *
> > sizeof(*grp->settings), GFP_KERNEL); if (!grp->settings) return -ENOMEM;
> > for (i = 0, j = 0; i < size; i += 4, j++) { struct device_node
> > *np_config; const __be32 *phandle; pin->offset = be32_to_cpu(*list++) *
> > MA35_MFP_REG_SZ_PER_BANK + MA35_MFP_REG_BASE; pin->shift =
> > (be32_to_cpu(*list++) * MA35_MFP_BITS_PER_PORT) % 32; pin->muxval =
> > be32_to_cpu(*list++); phandle = list++; if (!phandle) return -EINVAL;
> > np_config = of_find_node_by_phandle(be32_to_cpup(phandle)); ret =
> > pinconf_generic_parse_dt_config(np_config, NULL, &pin->configs,
> > &pin->nconfigs); if (ret) return ret; grp->pins[j] =
> > npctl->info->get_pin_num(pin->offset, pin->shift); pin++; } Best
> > Regards, Jacky Huang
> Sorry, I cannot parse it.
>
> I was referring to the children with unit addresses. I don't see any
> populate of the children, so why do you need them?
>
> There are no compatibles, either.
>
> Which part of your driver uses them exactly?
>
> Best regards,
> Krzysztof
So, I should update the binding from "^pin-[a-z0-9]+$" to something like 
"-pincfg$".
Just remove the unit address part, and it will become:

    default-pincfg {
        slew-rate = <0>;
        input-schmitt-disable;
        bias-disable;
        power-source = <1>;
        drive-strength = <17100>;
    };


Best Regards,
Jacky Huang