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

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Message-ID: <97e2b1e4-1763-42c4-a3f0-986492ecfd97@linaro.org>
Date: Tue, 12 Nov 2024 09:24:31 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Xianwei Zhao <xianwei.zhao@...ogic.com>,
 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

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.

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,
>>