linux-kernel - Re: [PATCH v2 2/3] dt-bindings: atmel,hlcdc: convert pwm bindings to json-schema

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Date: Tue, 16 Jan 2024 18:03:19 +0000
From: Conor Dooley <conor@...nel.org>
To: Dharma Balasubiramani <dharma.b@...rochip.com>
Cc: conor.dooley@...rochip.com, sam@...nborg.org, bbrezillon@...nel.org,
	maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
	tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, nicolas.ferre@...rochip.com,
	alexandre.belloni@...tlin.com, claudiu.beznea@...on.dev,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	lee@...nel.org, thierry.reding@...il.com,
	u.kleine-koenig@...gutronix.de, linux-pwm@...r.kernel.org,
	linux4microchip@...rochip.com
Subject: Re: [PATCH v2 2/3] dt-bindings: atmel,hlcdc: convert pwm bindings to
 json-schema

On Tue, Jan 16, 2024 at 05:07:59PM +0530, Dharma Balasubiramani wrote:
> Convert device tree bindings for Atmel's HLCDC PWM controller to YAML
> format.
> 
> Signed-off-by: Dharma Balasubiramani <dharma.b@...rochip.com>
> ---
> changelog
> v1 -> v2
> - Remove the explicit copyrights.
> - Modify title (not include words like binding/driver).
> - Modify description actually describing the hardware and not the driver.
> - Remove pinctrl properties which aren't required.
> - Drop parent node and it's other sub-device node which are not related here.
> ---
>  .../bindings/pwm/atmel,hlcdc-pwm.yaml         | 47 +++++++++++++++++++
>  .../bindings/pwm/atmel-hlcdc-pwm.txt          | 29 ------------
>  2 files changed, 47 insertions(+), 29 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/pwm/atmel,hlcdc-pwm.yaml
>  delete mode 100644 Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
> 
> diff --git a/Documentation/devicetree/bindings/pwm/atmel,hlcdc-pwm.yaml b/Documentation/devicetree/bindings/pwm/atmel,hlcdc-pwm.yaml
> new file mode 100644
> index 000000000000..751122309fa9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/atmel,hlcdc-pwm.yaml
> @@ -0,0 +1,47 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

The original file has no license, but was originally written by a
free-electrons employee, so the relicensing here is fine.

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pwm/atmel,hlcdc-pwm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Atmel's HLCDC's PWM controller
> +
> +maintainers:
> +  - Nicolas Ferre <nicolas.ferre@...rochip.com>
> +  - Alexandre Belloni <alexandre.belloni@...tlin.com>
> +  - Claudiu Beznea <claudiu.beznea@...on.dev>
> +
> +description: |

Again, the | is not needed here.

> +  The LCDC integrates a Pulse Width Modulation (PWM) Controller. This block
> +  generates the LCD contrast control signal (LCD_PWM) that controls the
> +  display's contrast by software. LCDC_PWM is an 8-bit PWM signal that can be
> +  converted to an analog voltage with a simple passive filter. LCD display
> +  panels have different backlight specifications in terms of minimum/maximum
> +  values for PWM frequency. If the LCDC PWM frequency range does not match the
> +  LCD display panel, it is possible to use the standalone PWM Controller to
> +  drive the backlight.
> +
> +properties:
> +  compatible:
> +    const: atmel,hlcdc-pwm
> +
> +  "#pwm-cells":
> +    const: 3
> +    description: |
> +      This PWM chip uses the default 3 cells bindings defined in pwm.yaml in
> +      this directory.

I would delete this description tbh.

> +
> +required:
> +  - compatible
> +  - "#pwm-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    pwm: pwm {
> +      compatible = "atmel,hlcdc-pwm";
> +      pinctrl-names = "default";
> +      pinctrl-0 = <&pinctrl_lcd_pwm>;
> +      #pwm-cells = <3>;
> +    };

The label here is not used and can be dropped. Otherwise,
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>


Cheers,
Conor.

> diff --git a/Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt b/Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
> deleted file mode 100644
> index afa501bf7f94..000000000000
> --- a/Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
> +++ /dev/null
> @@ -1,29 +0,0 @@
> -Device-Tree bindings for Atmel's HLCDC (High-end LCD Controller) PWM driver
> -
> -The Atmel HLCDC PWM is subdevice of the HLCDC MFD device.
> -See ../mfd/atmel-hlcdc.txt for more details.
> -
> -Required properties:
> - - compatible: value should be one of the following:
> -   "atmel,hlcdc-pwm"
> - - pinctr-names: the pin control state names. Should contain "default".
> - - pinctrl-0: should contain the pinctrl states described by pinctrl
> -   default.
> - - #pwm-cells: should be set to 3. This PWM chip use the default 3 cells
> -   bindings defined in pwm.yaml in this directory.
> -
> -Example:
> -
> -	hlcdc: hlcdc@...30000 {
> -		compatible = "atmel,sama5d3-hlcdc";
> -		reg = <0xf0030000 0x2000>;
> -		clocks = <&lcdc_clk>, <&lcdck>, <&clk32k>;
> -		clock-names = "periph_clk","sys_clk", "slow_clk";
> -
> -		hlcdc_pwm: hlcdc-pwm {
> -			compatible = "atmel,hlcdc-pwm";
> -			pinctrl-names = "default";
> -			pinctrl-0 = <&pinctrl_lcd_pwm>;
> -			#pwm-cells = <3>;
> -		};
> -	};
> -- 
> 2.25.1
> 

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