linux-kernel - Re: [PATCH v2 01/21] dt-bindings: display: tegra: add Tegra20 VIP

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Date:   Thu, 22 Dec 2022 10:03:34 +0100
From:   Luca Ceresoli <luca.ceresoli@...tlin.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-media@...r.kernel.org, linux-tegra@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Richard Leitner <richard.leitner@...data.com>
Subject: Re: [PATCH v2 01/21] dt-bindings: display: tegra: add Tegra20 VIP

Hello Dmitry,

On Tue, 20 Dec 2022 23:13:05 +0300
Dmitry Osipenko <digetx@...il.com> wrote:

> 02.12.2022 11:11, Luca Ceresoli пишет:

...

> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-vip.yaml
> >>> @@ -0,0 +1,63 @@
> >>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> >>> +%YAML 1.2
> >>> +---
> >>> +$id: http://devicetree.org/schemas/display/tegra/nvidia,tegra20-vip.yaml#
> >>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >>> +
> >>> +title: NVIDIA Tegra VIP (parallel video capture) controller
> >>> +
> >>> +maintainers:
> >>> +  - Luca Ceresoli <luca.ceresoli@...tlin.com>
> >>> +
> >>> +properties:
> >>> +  compatible:
> >>> +    enum:
> >>> +      - nvidia,tegra20-vip
> >>> +
> >>> +  "#address-cells":
> >>> +    const: 1
> >>> +
> >>> +  "#size-cells":
> >>> +    const: 0
> >>> +
> >>> +  channel@0:    
> >> Kind of odd there is only 1 channel with a unit-address. Are more 
> >> channels coming? Please make the binding as complete as possible even if 
> >> no driver support yet.  
> > This was discussed in v1 with Krzysztof and the outcome was that it's
> > OK because it's likely that other SoCs have more, but the documentation
> > is not public so I cannot add examples.
> > 
> > Full discussion (pretty short indeed):
> > 
> > https://lore.kernel.org/linux-devicetree/5292cc1b-c951-c5c5-b2ef-c154baf6d7fd@linaro.org/
> > 
> > Do you agree that the unit-address should be kept?  
> 
> It's doubtful that there is a SoC having a VIP with multiple channels.
> I'd expect it to be multiple VIPs rather than channels. There are NVIDIA
> people to confirm that.
> 
> The "channel" itself looks redundant to me, i.e. the reg and ports
> should be moved to the vip node.

OK, will do in v3 unless there are different opinions.

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com