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

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Message-ID: <27aa3716-1d28-4da8-80e6-212d7f94d193@linaro.org>
Date: Sun, 10 Nov 2024 13:24:15 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: 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

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

> 
> 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,