linux-kernel - Re: [PATCH 2/2] dt-bindings: display: Add Loongson display controller

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Date:   Thu, 23 Feb 2023 11:09:01 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     suijingfeng <suijingfeng@...ngson.cn>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 2/2] dt-bindings: display: Add Loongson display controller

On 23/02/2023 10:51, suijingfeng wrote:
>>> diff --git a/Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml b/Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml
>>> new file mode 100644
>>> index 000000000000..98b78f449a80
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml
>> Filename based on compatible, so "loongson,ls2k1000-dc.yaml"
> 
> what if we have more than one SoC,
> 
> we have  loongson,ls2k1000-dc, loongson,ls2k2000-dc and loongson,ls2k0500-dc
> 
> we will have loongson,ls2k3000-dc in the future, then how should i write 
> this?

Then it is fine.

> 
> I want a single file yaml file include them all.
> 
> I'm asking because we don't know which method is good, write three piece 
> of yaml or just one.
> 
> Just tell me how to write this, i will follow you instruction.
> 
>>> @@ -0,0 +1,58 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/display/loongson/loongson,display-controller.yaml#
>>>
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Loongson Display Controller Device Tree Bindings
>> Drop "Device Tree Bindings"
> OK,
>>> +
>>> +maintainers:
>>> +  - Sui Jingfeng <suijingfeng@...ngson.cn>
>>> +
>>> +description: |+
>> Drop |+
>>
>>> +
>> No need for blank line. Do you see it anywhere else in the bindings?
> OK, acceptable.
>>> +  The display controller is a PCI device, it has two display pipe.
>>> +  For the DC in LS2K1000 each way has a DVO output interface which
>>> +  provide RGB888 signals, vertical & horizontal synchronisations
>>> +  and the pixel clock. Each CRTC is able to support 1920x1080@...z,
>>> +  the maximum resolution is 2048x2048 according to the hardware spec.
>>> +
>>> +properties:
>>> +  $nodename:
>>> +    pattern: "^display-controller@[0-9a-f],[0-9a-f]$"
>> Drop nodename.
> 
> Are you sure about this?  When i  write this property, I'm reference the 
> ingenic,lcd.yaml .
> 
> ingenic,lcd.yaml has nodename too.
> 
> If I delete $nodename, then the test results say 
> '^display-controller@[0-9a-f],[0-9a-f]$'  is not of type 'object'.
> 
> log is pasted at below.

I meant, drop entire nodename and pattern.



Best regards,
Krzysztof