linux-kernel - Re: [PATCH v9 1/4] drm/i2c: tda998x: Add DT support for audio

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Date:	Tue, 13 Jan 2015 16:54:11 +0100
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Philipp Zabel <p.zabel@...gutronix.de>,
	Andrew Jackson <Andrew.Jackson@....com>,
	Jyri Sarha <jsarha@...com>, Mark Brown <broonie@...nel.org>,
	Dave Airlie <airlied@...il.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 1/4] drm/i2c: tda998x: Add DT support for audio

On Tue, 13 Jan 2015 12:27:15 +0000
Russell King - ARM Linux <linux@....linux.org.uk> wrote:

> On Tue, Jan 13, 2015 at 01:21:58PM +0100, Philipp Zabel wrote:
> > I wonder if it wouldn't be nicer to have the AP# and type in the device
> > tree and then calculate the register value from that in the driver.
> > 
> > 	port@1 {
> > 		reg = <1>; /* AP1 */
> > 		nxp,audio-port = "i2s";
> > 		tda998x_i2s: endpoint {
> > 			remote-endpoint = <&audio1_i2s>;
> > 		};
> > 	};
> 
> What about the case where we have 4 I2S streams being supplied to the
> device on four separate AP inputs?

4 streams on 4 different APs (sources) should work, but 4 streams from
a same source should be detailed.

In an other way, the unit address (== first reg) does not need to be a
sequence number. It is the I/O base in most DTs.
So, it could be the port value: 

	port@...145 {
		port-type = "rgb";
		reg = <0x230145>;
		hdmi_0: endpoint {
			remote-endpoint = <&lcd0_0>;
		};
	};
	port@3 {			/* AP1 = I2S */
		port-type = "i2s";
		reg = <0x03>;
		tda998x_i2s: endpoint {
			remote-endpoint = <&audio1_i2s>;
		};
	};
	port@4 {			 /* AP2 = S/PDIF */
		port-type = "spdif";
		reg = <0x04>;
		tda998x_spdif: endpoint {
			remote-endpoint = <&audio1_spdif1>;
		};
	};

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/
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