linux-kernel - Re: [PATCH RFC v4 0/4] Pinctrl: A4: Add pinctrl driver

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Message-ID: <00e16b73-ddbe-4d9c-b485-9ed2a1e10087@amlogic.com>
Date: Tue, 12 Nov 2024 16:58:00 +0800
From: Xianwei Zhao <xianwei.zhao@...ogic.com>
To: neil.armstrong@...aro.org, Linus Walleij <linus.walleij@...aro.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Kevin Hilman <khilman@...libre.com>,
 Jerome Brunet <jbrunet@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
 Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-amlogic@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v4 0/4] Pinctrl: A4: Add pinctrl driver

Hi Neil,
    Thanks for your reply.

On 2024/11/12 16:24, Neil Armstrong wrote:
> [ EXTERNAL EMAIL ]
> 
> On 11/11/2024 04:26, Xianwei Zhao wrote:
>> Hi Neil,
>>     Thanks for your reply.
>>
>> On 2024/11/10 20:24, Neil Armstrong wrote:
>>> [ EXTERNAL EMAIL ]
>>>
>>> Hi,
>>>
>>> Le 01/11/2024 à 09:27, Xianwei Zhao via B4 Relay a écrit :
>>>> Add pinctrl driver support for Amloigc A4 SoC
>>>>
>>>> I want to find out what kind of solution is feasible to
>>>> meet the needs of all parties. This RFC verion is one of them.
>>>>
>>>> All of Amogic SoCs GPIO device requirement is met here by
>>>> adding GPIO bank definition instead of the pin definition.
>>>> Binding header files will no longer be added to future
>>>> SoCs's pin devices.
>>>>
>>>> The pinctrl software only adds insterface of of_xlate to support
>>>> for transformation without affecting the overall framework and
>>>> is compatible with previous drivers.
>>>>
>>>> The code in DTS file is also readable when using GPIO, as below:
>>>>
>>>> reset-gpios = <&gpio AMLOGIC_GPIO(AMLOGIC_GPIO_X, 6) GPIO_ACTIVE_LOW>;
>>>
>>> Fine, but why not use 3 cells instead of this macro ? Since you 
>>> introduced the
>>> custom xlate, parsing the 3 cells would be easier that using a macro:
>>>
>>> reset-gpios = <&gpio AMLOGIC_GPIO_X 6 GPIO_ACTIVE_LOW>;
>>>
>>> Neil
>>
>> I was prepared to do this before, mainly later considering 
>> incompatible binding, using the original two parameter passing
>>
>> If use three parameters, I  need to modify the corresponding binding 
>> property. in file:
>> Documentation/devicetree/bindings/pinctrl/amlogic,meson-pinctrl-common.yaml
>>
>>        "#gpio-cells":
>>          const: 2
>> It must be compatible with the current number of parameters(3)
> 
> Yes, you may move the #gpio-cells definition out of the common yaml
> and define them in the soc spefic yaml and set it to 3 for a4.
> 

I can modify 
Documentation/devicetree/bindings/pinctrl/amlogic,meson-pinctrl-common.yaml 
file
change
         "#gpio-cells":
           const: 2
to
         "#gpio-cells":
           enum: [2, 3]

  and make it to compatible with subsequent ones. Do you feel OK?

> Neil
> 
>>
>>>
>>>>
>>>> Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
>>>> ---
>>>> Changes in v4:
>>>> - Add interface of of_xlate support.
>>>> - Add const for some variable.
>>>> - Link to v3: 
>>>> https://lore.kernel.org/r/20241018-a4_pinctrl-v3-0-e76fd1cf01d7@amlogic.com
>>>>
>>>> Changes in v3:
>>>> - Remove head file from binding.
>>>> - Move GPIO define to file *.c.
>>>> - Link to v2: 
>>>> https://lore.kernel.org/r/20241014-a4_pinctrl-v2-0-3e74a65c285e@amlogic.com
>>>>
>>>> Changes in v2:
>>>> - Use one marco instead of all pin define.
>>>> - Add unit name for dts node.
>>>> - Link to v1: 
>>>> https://lore.kernel.org/all/20240611-a4_pinctrl-v1-0-dc487b1977b3@amlogic.com/
>>>>
>>>> ---
>>>> Xianwei Zhao (4):
>>>>        dt-bindings: pinctrl: Add support for Amlogic A4 SoCs
>>>>        pinctrl: meson: add interface of of_xlate
>>>>        pinctrl: meson: Add driver support for Amlogic A4 SoCs
>>>>        arm64: dts: amlogic: a4: add pinctrl node
>>>>
>>>>   .../bindings/pinctrl/amlogic,meson-pinctrl-a1.yaml |    2 +
>>>>   arch/arm64/boot/dts/amlogic/amlogic-a4.dtsi        |   36 +
>>>>   drivers/pinctrl/meson/Kconfig                      |    6 +
>>>>   drivers/pinctrl/meson/Makefile                     |    1 +
>>>>   drivers/pinctrl/meson/pinctrl-amlogic-a4.c         | 1321 
>>>> ++++++++++++++++++++
>>>>   drivers/pinctrl/meson/pinctrl-meson.c              |    4 +
>>>>   drivers/pinctrl/meson/pinctrl-meson.h              |    4 +
>>>>   include/dt-bindings/gpio/amlogic-gpio.h            |   50 +
>>>>   8 files changed, 1424 insertions(+)
>>>> ---
>>>> base-commit: 58e2d28ed28e5bc8836f8c14df1f94c27c1f9e2f
>>>> change-id: 20241012-a4_pinctrl-09d1b2a17e47
>>>>
>>>> Best regards,
>>>
>