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

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Date:   Fri, 16 Oct 2020 14:30:08 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     Mark Brown <broonie@...nel.org>
CC:     <robh+dt@...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 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.