linux-kernel - Re: [PATCH v3 2/3] dt-bindings: atmel,hlcdc: convert pwm bindings to json-schema

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Date: Wed, 24 Jan 2024 09:58:46 +0000
From: <Dharma.B@...rochip.com>
To: <robh@...nel.org>
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>,
	<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 v3 2/3] dt-bindings: atmel,hlcdc: convert pwm bindings to
 json-schema

Hi Rob,
On 20/01/24 1:15 am, Rob Herring wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On Thu, Jan 18, 2024 at 02:56:11PM +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>
>> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
>> ---
>> changelog
>> v2 -> v3
>> - Remove '|' in description, as there is no formatting to preserve.
>> - Delete the description for pwm-cells.
>> - Drop the label for pwm node as it not used.
>> 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         | 44 +++++++++++++++++++
>>   .../bindings/pwm/atmel-hlcdc-pwm.txt          | 29 ------------
>>   2 files changed, 44 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..4f4cc21fe4f7
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pwm/atmel,hlcdc-pwm.yaml
>> @@ -0,0 +1,44 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%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:
>> +  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
>> +
>> +required:
>> +  - compatible
>> +  - "#pwm-cells"
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    pwm {
>> +      compatible = "atmel,hlcdc-pwm";
>> +      pinctrl-names = "default";
>> +      pinctrl-0 = <&pinctrl_lcd_pwm>;
>> +      #pwm-cells = <3>;
>> +    };
> 
> Move the example to the MFD schema. Or just drop if already there.

As Sam suggested I will send v4 series with this binding as it is and 
will send the clean up patch later.

-- 
Thanks,
Dharma B.
> 
> Rob