linux-kernel - Re: [PATCH] dt-bindings: gpio: nxp,lpc32xx-gpio: Convert to dtschema

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Message-ID: <20240724-sappiness-apprehend-b66630b94bcf@spud>
Date: Wed, 24 Jul 2024 18:00:46 +0100
From: Conor Dooley <conor@...nel.org>
To: Animesh Agarwal <animeshagarwal28@...il.com>
Cc: Daniel Baluta <daniel.baluta@....com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Vladimir Zapolskiy <vz@...ia.com>, linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: gpio: nxp,lpc32xx-gpio: Convert to dtschema

Yo,

On Wed, Jul 24, 2024 at 09:42:28PM +0530, Animesh Agarwal wrote:
> Convert the NXP LPC32xx SoC GPIO controller bindings to DT schema format.
> 
> Cc: Daniel Baluta <daniel.baluta@....com>
> Signed-off-by: Animesh Agarwal <animeshagarwal28@...il.com>
> ---
>  .../devicetree/bindings/gpio/gpio_lpc32xx.txt | 43 ---------------
>  .../bindings/gpio/nxp,lpc32xx-gpio.yaml       | 52 +++++++++++++++++++
>  2 files changed, 52 insertions(+), 43 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/gpio/gpio_lpc32xx.txt
>  create mode 100644 Documentation/devicetree/bindings/gpio/nxp,lpc32xx-gpio.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpio/gpio_lpc32xx.txt b/Documentation/devicetree/bindings/gpio/gpio_lpc32xx.txt
> deleted file mode 100644
> index 49819367a011..000000000000
> --- a/Documentation/devicetree/bindings/gpio/gpio_lpc32xx.txt
> +++ /dev/null
> @@ -1,43 +0,0 @@
> -NXP LPC32xx SoC GPIO controller
> -
> -Required properties:
> -- compatible: must be "nxp,lpc3220-gpio"
> -- reg: Physical base address and length of the controller's registers.
> -- gpio-controller: Marks the device node as a GPIO controller.
> -- #gpio-cells: Should be 3:
> -   1) bank:
> -      0: GPIO P0
> -      1: GPIO P1
> -      2: GPIO P2
> -      3: GPIO P3
> -      4: GPI P3
> -      5: GPO P3
> -   2) pin number
> -   3) optional parameters:
> -      - bit 0 specifies polarity (0 for normal, 1 for inverted)
> -- reg: Index of the GPIO group

> diff --git a/Documentation/devicetree/bindings/gpio/nxp,lpc32xx-gpio.yaml b/Documentation/devicetree/bindings/gpio/nxp,lpc32xx-gpio.yaml
> new file mode 100644
> index 000000000000..5974b2775d23
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/nxp,lpc32xx-gpio.yaml

Can you make this filename the same as the compatible string please?

> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause

Hmm, the original author does not appear to be from one of the companies
where there's a carte blanche for binding relicensing.

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/nxp,lpc32xx-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP LPC32xx SoC GPIO controller
> +
> +maintainers:
> +  - Animesh Agarwal <animeshagarwal28@...il.com>
> +
> +properties:
> +  compatible:
> +    const: nxp,lpc3220-gpio
> +
> +  reg:
> +    maxItems: 1
> +
> +  gpio-controller: true
> +
> +  '#gpio-cells':
> +    const: 3
> +    description: |
> +      1) bank:
> +        0: GPIO P0
> +        1: GPIO P1
> +        2: GPIO P2
> +        3: GPIO P3
> +        4: GPI P3
> +        5: GPO P3
> +      2) pin number
> +      3) optional parameters:

This isn't optional, since you've made the number of cells const: 3. The
original binding also says "should be 3", so I think that's reasonable.
Just drop the optional wording.

Otherwise, looks pretty okay to me.

Cheers,
Conor.

> +        - bit 0 specifies polarity (0 for normal, 1 for inverted)
> +
> +required:
> +  - compatible
> +  - reg
> +  - gpio-controller
> +  - '#gpio-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    gpio@...28000 {
> +        compatible = "nxp,lpc3220-gpio";
> +        reg = <0x40028000 0x1000>;
> +        gpio-controller;
> +        #gpio-cells = <3>; /* bank, pin, flags */
> +    };
> -- 
> 2.45.2
> 

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