linux-kernel - Re: [PATCH 1/3] dt-bindings: display: bridge: add sam9x7-lvds compatible

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Message-ID: <40094cda-5620-4273-b181-312452e9f6a1@microchip.com>
Date: Tue, 23 Jan 2024 03:30:37 +0000
From: <Dharma.B@...rochip.com>
To: <krzk@...nel.org>, <Manikandan.M@...rochip.com>,
	<andrzej.hajda@...el.com>, <neil.armstrong@...aro.org>, <rfoss@...nel.org>,
	<Laurent.pinchart@...asonboard.com>, <jonas@...boo.se>,
	<jernej.skrabec@...il.com>, <airlied@...il.com>, <daniel@...ll.ch>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <robh+dt@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
	<dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <Linux4Microchip@...rochip.com>
Subject: Re: [PATCH 1/3] dt-bindings: display: bridge: add sam9x7-lvds
 compatible

Hi Krzysztof,

On 22/01/24 9:21 pm, Krzysztof Kozlowski wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On 22/01/2024 09:29, Dharma Balasubiramani wrote:
>> Add the 'sam9x7-lvds' compatible binding, which describes the
>> Low Voltage Differential Signaling (LVDS) Controller found on Microchip's
>> sam9x7 series System-on-Chip (SoC) devices. This binding will be used to
>> define the properties and configuration for the LVDS Controller in DT.
>>
>> Signed-off-by: Dharma Balasubiramani <dharma.b@...rochip.com>
>> ---
>>   .../display/bridge/microchip,sam9x7-lvds.yaml | 59 +++++++++++++++++++
>>   1 file changed, 59 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/display/bridge/microchip,sam9x7-lvds.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/display/bridge/microchip,sam9x7-lvds.yaml b/Documentation/devicetree/bindings/display/bridge/microchip,sam9x7-lvds.yaml
>> new file mode 100644
>> index 000000000000..8c2c5b858c85
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/bridge/microchip,sam9x7-lvds.yaml
>> @@ -0,0 +1,59 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/display/bridge/microchip,sam9x7-lvds.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Microchip SAM9X7 LVDS Controller
> 
> What is the "X
Answered below
> 
>> +
>> +maintainers:
>> +  - Dharma Balasubiramani <dharma.b@...rochip.com>
>> +
>> +description: |
> 
> Do not need '|' unless you need to preserve formatting.
Sure, I will drop it.
> 
>> +  The Low Voltage Differential Signaling Controller (LVDSC) manages data
>> +  format conversion from the LCD Controller internal DPI bus to OpenLDI
>> +  LVDS output signals. LVDSC functions include bit mapping, balanced mode
>> +  management, and serializer.
>> +
>> +properties:
>> +  compatible:
>> +    const: microchip,sam9x7-lvds
> 
> What is "x"? Wildcard? Then no, don't use it and instead use proper SoC
> version number.
The term 'X' doesn't serve as a wildcard; rather, it directly represents 
the name of the SoC series, I should use sam9x75,sam9x72 instead of sam9x7.
> 
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    items:
>> +      - description: Peripheral Bus Clock
>> +
>> +  clock-names:
>> +    items:
>> +      - const: pclk
>> +      - const: gclk
>> +    minItems: 1
> 
> No, you just said you have one clock.
Certainly, I need to exclude the gclk. Thanks.
> 
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +  - clocks
>> +  - clock-names
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/clock/at91.h>
>> +    #include <dt-bindings/dma/at91.h>
>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> 
> This header is not used. Include only used ones (and missing interrupt).
> 
>> +
>> +    lvds-controller@...60000 {
>> +      compatible = "microchip,sam9x7-lvds";
>> +      reg = <0xf8060000 0x100>;
>> +      interrupts = <56 IRQ_TYPE_LEVEL_HIGH 0>;
> 
> What is "0"?

Please refer 
"Documentation/devicetree/bindings/interrupt-controller/atmel,aic.txt"
The third cell is used to specify the irq priority from 0 (lowest) to 
7(highest).

-- 
With Best Regards,
Dharma B.
> 
>> +      clocks = <&pmc PMC_TYPE_PERIPHERAL 56>;
>> +      clock-names = "pclk";
>> +    };
> 
> Best regards,
> Krzysztof
>