linux-kernel - Re: [PATCH 0/7] Add dts for Rpi4 + Cirrus Lochnagar and codecs

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Message-ID: <20201019204821.GA3569507@bogus>
Date:   Mon, 19 Oct 2020 15:48:21 -0500
From:   Rob Herring <robh@...nel.org>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>
Cc:     Mark Brown <broonie@...nel.org>, nsaenzjulienne@...e.de,
        patches@...nsource.cirrus.com, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/7] Add dts for Rpi4 + Cirrus Lochnagar and codecs

On Fri, Oct 16, 2020 at 02:30:08PM +0100, Richard Fitzgerald wrote:
> On 14/10/2020 19:56, Mark Brown wrote:
> > On Wed, Oct 14, 2020 at 03:54:11PM +0100, Richard Fitzgerald wrote:
> > > This set of patches provides support for using the Cirrus Logic
> > > Lochnagar audio development platform plus Cirrus Logic Madera/Arizona
> > > codecs with the simple-card machine driver and a Raspberry Pi4. The
> > > ultimate aim is to provide the dts file but some updates are needed to
> > > the simple-card machine driver.
> > 
> > Why extend simple-card and not the more modern and flexible
> > audio-graph-card?
> > 
> 
> I'm struggling to understand how to use audio-graph-card where there are
> multiple alternative codecs. The host I2S endpoint has to point back to
> the codec endpoint, like this:
> 
> 	cpu_i2s_ep_cs47l15: endpoint {
> 		remote-endpoint = <&cs47l15_aif1>;
> 	};
>
> But obviously that depends on which codec node was enabled. Listing
> multiple endpoints makes the whole port node disabled if any remote
> endpoint is in a disabled node. I've tried adding status="disabled"
> to endpoints or multiple port definitions with status="disabled" but
> I haven't figured out a solution.

Multiple endpoints is what you should do. And 'status' goes in the 
device nodes (not the graph nodes).

Rob