linux-kernel - Re: [PATCH 1/3] dt-bindings: pinctrl: Add support for Amlogic A4 SoCs

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Message-ID: <20240613170816.GA2020944-robh@kernel.org>
Date: Thu, 13 Jun 2024 11:08:16 -0600
From: Rob Herring <robh@...nel.org>
To: Xianwei Zhao <xianwei.zhao@...ogic.com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Kevin Hilman <khilman@...libre.com>,
	Jerome Brunet <jbrunet@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	Bartosz Golaszewski <brgl@...ev.pl>, 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 1/3] dt-bindings: pinctrl: Add support for Amlogic A4 SoCs

On Tue, Jun 11, 2024 at 01:10:57PM +0800, Xianwei Zhao wrote:
> Add the new compatible name for Amlogic A4 pin controller, and add
> a new dt-binding header file which document the detail pin names.
> 
> Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
> ---
>  .../bindings/pinctrl/amlogic,meson-pinctrl-a1.yaml |  2 +
>  .../dt-bindings/gpio/amlogic,a4-aobus-pinctrl.h    | 21 +++++
>  .../dt-bindings/gpio/amlogic,a4-periphs-pinctrl.h  | 93 ++++++++++++++++++++++
>  3 files changed, 116 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/amlogic,meson-pinctrl-a1.yaml b/Documentation/devicetree/bindings/pinctrl/amlogic,meson-pinctrl-a1.yaml
> index d9e0b2c48e84..f5eefa0fab5b 100644
> --- a/Documentation/devicetree/bindings/pinctrl/amlogic,meson-pinctrl-a1.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/amlogic,meson-pinctrl-a1.yaml
> @@ -15,6 +15,8 @@ allOf:
>  properties:
>    compatible:
>      enum:
> +      - amlogic,a4-aobus-pinctrl
> +      - amlogic,a4-periphs-pinctrl
>        - amlogic,c3-periphs-pinctrl
>        - amlogic,t7-periphs-pinctrl
>        - amlogic,meson-a1-periphs-pinctrl
> diff --git a/include/dt-bindings/gpio/amlogic,a4-aobus-pinctrl.h b/include/dt-bindings/gpio/amlogic,a4-aobus-pinctrl.h
> new file mode 100644
> index 000000000000..7c7e746baed5
> --- /dev/null
> +++ b/include/dt-bindings/gpio/amlogic,a4-aobus-pinctrl.h
> @@ -0,0 +1,21 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR MIT) */
> +/*
> + * Copyright (c) 2024 Amlogic, Inc. All rights reserved.
> + * Author: Xianwei Zhao <xianwei.zhao@...ogic.com>
> + */
> +
> +#ifndef _DT_BINDINGS_AMLOGIC_A4_AOBUS_PINCTRL_H
> +#define _DT_BINDINGS_AMLOGIC_A4_AOBUS_PINCTRL_H
> +
> +/* GPIOAO */
> +#define GPIOAO_0			0
> +#define GPIOAO_1			1
> +#define GPIOAO_2			2
> +#define GPIOAO_3			3
> +#define GPIOAO_4			4
> +#define GPIOAO_5			5
> +#define GPIOAO_6			6

I find defines with the value of the define in the name pretty 
pointless.

> +
> +#define GPIO_TEST_N			7
> +
> +#endif
> diff --git a/include/dt-bindings/gpio/amlogic,a4-periphs-pinctrl.h b/include/dt-bindings/gpio/amlogic,a4-periphs-pinctrl.h
> new file mode 100644
> index 000000000000..dfabca4b4790
> --- /dev/null
> +++ b/include/dt-bindings/gpio/amlogic,a4-periphs-pinctrl.h
> @@ -0,0 +1,93 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR MIT) */
> +/*
> + * Copyright (c) 2024 Amlogic, Inc. All rights reserved.
> + * Author: Xianwei Zhao <xianwei.zhao@...ogic.com>
> + */
> +
> +#ifndef _DT_BINDINGS_AMLOGIC_A4_PERIPHS_PINCTRL_H
> +#define _DT_BINDINGS_AMLOGIC_A4_PERIPHS_PINCTRL_H
> +
> +/* GPIOE */
> +#define GPIOE_0				0
> +#define GPIOE_1				1
> +
> +/* GPIOD */
> +#define GPIOD_0				2
> +#define GPIOD_1				3
> +#define GPIOD_2				4
> +#define GPIOD_3				5
> +#define GPIOD_4				6
> +#define GPIOD_5				7
> +#define GPIOD_6				8
> +#define GPIOD_7				9
> +#define GPIOD_8				10
> +#define GPIOD_9				11
> +#define GPIOD_10			12
> +#define GPIOD_11			13
> +#define GPIOD_12			14
> +#define GPIOD_13			15
> +#define GPIOD_14			16
> +#define GPIOD_15			17

I'm not really much of a fan of using defines for GPIOs, but if you do, 
wouldn't be better to split banks and lines up rather than a global 
number space. See ASPEED_GPIO() or tegra header.

Rob