linux-kernel - Re: [PATCH v2 0/3] drm/mediatek: Add support for OF graphs

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Date: Mon, 06 May 2024 15:17:36 +0200
From: "Michael Walle" <mwalle@...nel.org>
To: "AngeloGioacchino Del Regno" <angelogioacchino.delregno@...labora.com>,
 "Alexandre Mergnat" <amergnat@...libre.com>, <chunkuang.hu@...nel.org>
Cc: <robh@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
 <conor+dt@...nel.org>, <p.zabel@...gutronix.de>, <airlied@...il.com>,
 <daniel@...ll.ch>, <maarten.lankhorst@...ux.intel.com>,
 <mripard@...nel.org>, <tzimmermann@...e.de>, <matthias.bgg@...il.com>,
 <shawn.sung@...iatek.com>, <yu-chang.lee@...iatek.com>,
 <ck.hu@...iatek.com>, <jitao.shi@...iatek.com>,
 <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <dri-devel@...ts.freedesktop.org>, <linux-mediatek@...ts.infradead.org>,
 <linux-arm-kernel@...ts.infradead.org>, <wenst@...omium.org>,
 <kernel@...labora.com>
Subject: Re: [PATCH v2 0/3] drm/mediatek: Add support for OF graphs

Hi Angelo,

On Mon May 6, 2024 at 1:22 PM CEST, AngeloGioacchino Del Regno wrote:
> > The problem with this is that you need DDP_COMPONENT_DRM_OVL_ADAPTOR... which is
> > a software thing and not HW, so that can't be described in devicetree.
> > 
> > The only thing this series won't deal with is exactly that.
>
> Sorry, no, I got confused.
>
> The series *does* already deal with that, as the pipeline is built before the check
> for OVL_ADAPTOR components, so that will get probed.

Are you sure? Because who is actually adding the OVL_ADAPTOR to the
path? It looks like your patch will walk the graph and add all the
components according to their compatible string. And since the
OVL_ADAPTOR is virtual and doesn't have a node..

-michael