linux-kernel - Re: [PATCH v3 3/3] dt-bindings: mfd: atmel,hlcdc: Convert to DT schema format

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Message-ID: <c33868c8-dc42-4800-885c-5e5f24c2044e@microchip.com>
Date: Fri, 19 Jan 2024 03:32:49 +0000
From: <Dharma.B@...rochip.com>
To: <conor@...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>,
	<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 v3 3/3] dt-bindings: mfd: atmel,hlcdc: Convert to DT
 schema format

On 18/01/24 9:10 pm, Conor Dooley wrote:
> On Thu, Jan 18, 2024 at 02:56:12PM +0530, Dharma Balasubiramani wrote:
>> Convert the atmel,hlcdc binding to DT schema format.
>>
>> Adjust the clock-names property to clarify that the LCD controller expects
>> one of these clocks (either sys_clk or lvds_pll_clk to be present but not
>> both) along with the slow_clk and periph_clk. This alignment with the actual
>> hardware requirements will enable accurate device tree configuration for
>> systems using the HLCDC IP.
>>
>> Signed-off-by: Dharma Balasubiramani<dharma.b@...rochip.com>
>> ---
>> changelog
>> v2 -> v3
>> - Rename hlcdc-display-controller and hlcdc-pwm to generic names.
>> - Modify the description by removing the unwanted comments and '|'.
>> - Modify clock-names simpler.
>> v1 -> v2
>> - Remove the explicit copyrights.
>> - Modify title (not include words like binding/driver).
>> - Modify description actually describing the hardware and not the driver.
>> - Add details of lvds_pll addition in commit message.
>> - Ref endpoint and not endpoint-base.
>> - Fix coding style.
>> ...
>>   .../devicetree/bindings/mfd/atmel,hlcdc.yaml  | 97 +++++++++++++++++++
>>   .../devicetree/bindings/mfd/atmel-hlcdc.txt   | 56 -----------
>>   2 files changed, 97 insertions(+), 56 deletions(-)
>>   create mode 100644 Documentation/devicetree/bindings/mfd/atmel,hlcdc.yaml
>>   delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/atmel,hlcdc.yaml b/Documentation/devicetree/bindings/mfd/atmel,hlcdc.yaml
>> new file mode 100644
>> index 000000000000..eccc998ac42c
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mfd/atmel,hlcdc.yaml
>> @@ -0,0 +1,97 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id:http://devicetree.org/schemas/mfd/atmel,hlcdc.yaml#
>> +$schema:http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Atmel's HLCD Controller
>> +
>> +maintainers:
>> +  - Nicolas Ferre<nicolas.ferre@...rochip.com>
>> +  - Alexandre Belloni<alexandre.belloni@...tlin.com>
>> +  - Claudiu Beznea<claudiu.beznea@...on.dev>
>> +
>> +description:
>> +  The Atmel HLCDC (HLCD Controller) IP available on Atmel SoCs exposes two
>> +  subdevices, a PWM chip and a Display Controller.
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - atmel,at91sam9n12-hlcdc
>> +      - atmel,at91sam9x5-hlcdc
>> +      - atmel,sama5d2-hlcdc
>> +      - atmel,sama5d3-hlcdc
>> +      - atmel,sama5d4-hlcdc
>> +      - microchip,sam9x60-hlcdc
>> +      - microchip,sam9x75-xlcdc
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 3
> Hmm, one thing I probably should have said on the previous version, but
> I missed somehow: It would be good to add an items list to the clocks
> property here to explain what the 3 clocks are/are used for - especially
> since there is additional complexity being added here to use either the
> sys or lvds clocks.
May I inquire if this approach is likely to be effective?

   clocks:
     items:
       - description: peripheral clock
       - description: generic clock or lvds pll clock
           Once the LVDS PLL is enabled, the pixel clock is used as the
           clock for LCDC, so its GCLK is no longer needed.
       - description: slow clock
     maxItems: 3

-- 
With Best Regards,
Dharma B.
> 
> Thanks,
> Conor.
> 
>> +
>> +  clock-names:
>> +    items:
>> +      - const: periph_clk
>> +      - enum: [sys_clk, lvds_pll_clk]
>> +      - const: slow_clk