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

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Message-ID: <0140acce-1d24-4a61-a97b-def0d7c072d3@gmail.com>
Date:   Thu, 30 Nov 2023 16:23:49 +0800
From:   Jacky Huang <ychuang570808@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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 2023/11/30 下午 04:04, Krzysztof Kozlowski wrote:
> On 30/11/2023 02:10, Jacky Huang wrote:
>> 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>;
>>       };
>>
> No, it solves nothing. Instead of pasting more code, can you answer my
> questions?
>
> Best regards,
> Krzysztof
>

Yes, this node is invalid.
I will drop this node and update the yaml.


Best Regards,
Jacky Huang