linux-kernel - Re: [v1 1/3] dt-bindings: msm/dsi: Add yaml schema for 7nm DSI PHY

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Date:   Thu, 03 Jun 2021 01:32:09 +0530
From:   rajeevny@...eaurora.org
To:     Rob Herring <robh@...nel.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, sean@...rly.run, robdclark@...il.com,
        abhinavk@...eaurora.org, kalyan_t@...eaurora.org,
        mkrishn@...eaurora.org, jonathan@...ek.ca
Subject: Re: [v1 1/3] dt-bindings: msm/dsi: Add yaml schema for 7nm DSI PHY

On 02-06-2021 02:28, Rob Herring wrote:
> On Mon, May 31, 2021 at 07:03:53PM +0530, Rajeev Nandan wrote:

>> +
>> +properties:
>> +  compatible:
>> +    oneOf:
>> +      - const: qcom,dsi-phy-7nm
> 
> When would one use this?
This is for SM8250.

> 
>> +      - const: qcom,dsi-phy-7nm-7280
>> +      - const: qcom,dsi-phy-7nm-8150
> 
> These don't look like full SoC names (sm8150?) and it's
> <vendor>,<soc>-<block>.

Thanks, Rob, for the review.

I just took the `compatible` property currently used in the DSI PHY 
driver
(drivers/gpu/drm/msm/dsi/phy/dsi_phy.c), and added a new entry for 
sc7280.
A similar pattern of `compatible` names are used in other variants of 
the
DSI PHY driver e.g. qcom,qcom,dsi-phy-10nm-8998, qcom,dsi-phy-14nm-660 
etc.

The existing compatible names "qcom,dsi-phy-7nm-8150" (SoC at the end) 
make
some sense, if we look at the organization of the dsi phy driver code.
I am new to this and don't know the reason behind the current code
organization and this naming.

Yes, I agree with you, we should use full SoC names. Adding
the SoC name at the end does not feel very convincing, so I will change 
this
to the suggested format e.g. "qcom,sm8250-dsi-phy-7nm", and will rename 
the
occurrences in the driver and device tree accordingly.
Do I need to make changes for 10nm, 14nm, 20nm, and 28nm DSI PHY too?
Bindings doc for these PHYs recently got merged to msm-next [1]

[1] 
https://gitlab.freedesktop.org/drm/msm/-/commit/8fc939e72ff80116c090aaf03952253a124d2a8e

Thanks,
Rajeev