linux-kernel - Re: [PATCH 0/4 v2] Audio support for adv7511 hdmi bridge

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Date:   Wed, 2 Nov 2016 01:43:26 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     John Stultz <john.stultz@...aro.org>
CC:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        lkml <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        "Archit Taneja" <architt@...eaurora.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Andy Green <andy@...mcat.com>,
        "Dave Long" <dave.long@...aro.org>,
        Guodong Xu <guodong.xu@...aro.org>,
        "Zhangfei Gao" <zhangfei.gao@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        "Lars-Peter Clausen" <lars@...afoo.de>,
        Jose Abreu <joabreu@...opsys.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 0/4 v2] Audio support for adv7511 hdmi bridge


Hi John

> > Above patch is using normal simple-card style for HDMI sound, but as Laurent
> > said we want to use same DT style for HDMI video and sound (= OF graph style).
> > Fortunately, I posted patch-set for OF graph support on sound card yesterday.
> > Can you check this ?
> > http://www.spinics.net/lists/devicetree/msg146131.html
> > The points are
> >  - sound can use OF graph style DT
> >  - sound-card DT is no longer needed
> >  - it needs type = "sound" property
> >
> > patch-set [0/23] is this
> > http://www.spinics.net/lists/devicetree/msg146113.html
> 
> Thanks for the pointers! If I understand this correctly, the OF graph
> simple-card method would replace my current simple-card dts usage for
> hikey?   Other then just having another out-of-tree patchset to track,
> I don't have any objection to trying to use the OF graph simple-card
> method in the hikey dts (though I suspect I'll have to pester you for
> help when I give it a shot).

I posted v2 patchset OF graph simple-card which doesn't have "type" property.
Anyway, if you use OF graph simple-card, your "CPU" side driver need to
call asoc_simple_card_try_to_probe_graph_card() to probing it.

And this is not 100% mandatory, but your CPU and/or Codec driver
want to adjust OF graph style for parsing. The position is like this

simple-card :: dai-link <-> OF graph simple-card :: port/endpoint