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

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Message-ID: <e3bc24d6-d9ef-4705-8de7-05460f915b17@linaro.org>
Date:   Wed, 29 Nov 2023 11:54:56 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jacky Huang <ychuang570808@...il.com>, linus.walleij@...aro.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, p.zabel@...gutronix.de, j.neuschaefer@....net
Cc:     linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        ychuang3@...oton.com, schung@...oton.com
Subject: Re: [PATCH v2 3/4] arm64: dts: nuvoton: Add pinctrl support for
 ma35d1

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