From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jean-Francois Moine Subject: Re: [PATCH v9 1/4] drm/i2c: tda998x: Add DT support for audio Date: Tue, 13 Jan 2015 20:02:52 +0100 Message-ID: <20150113200252.3dbfab14@armhf> References: <20150109200127.GD12302@n2100.arm.linux.org.uk> <1421054728.3081.28.camel@pengutronix.de> <20150112122527.GF12302@n2100.arm.linux.org.uk> <1421071197.3081.44.camel@pengutronix.de> <20150112140456.GI12302@n2100.arm.linux.org.uk> <20150112181341.4a53ea24@armhf> <20150112175705.GN12302@n2100.arm.linux.org.uk> <1421151718.4519.24.camel@pengutronix.de> <20150113122715.GP12302@n2100.arm.linux.org.uk> <20150113165411.5469930d@armhf> <20150113160313.GR12302@n2100.arm.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20150113160313.GR12302@n2100.arm.linux.org.uk> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Russell King - ARM Linux Cc: "devicetree@vger.kernel.org" , "alsa-devel@alsa-project.org" , Andrew Jackson , "linux-kernel@vger.kernel.org" , Jyri Sarha , Mark Brown , "dri-devel@lists.freedesktop.org" List-Id: alsa-devel@alsa-project.org T24gVHVlLCAxMyBKYW4gMjAxNSAxNjowMzoxMyArMDAwMApSdXNzZWxsIEtpbmcgLSBBUk0gTGlu dXggPGxpbnV4QGFybS5saW51eC5vcmcudWs+IHdyb3RlOgoKPiBPbiBUdWUsIEphbiAxMywgMjAx NSBhdCAwNDo1NDoxMVBNICswMTAwLCBKZWFuLUZyYW5jb2lzIE1vaW5lIHdyb3RlOgo+ID4gNCBz dHJlYW1zIG9uIDQgZGlmZmVyZW50IEFQcyAoc291cmNlcykgc2hvdWxkIHdvcmssIGJ1dCA0IHN0 cmVhbXMgZnJvbQo+ID4gYSBzYW1lIHNvdXJjZSBzaG91bGQgYmUgZGV0YWlsZWQuCj4gCj4gSSdk IGxpa2UgdG8ga25vdyBob3cgeW91IGludGVuZCB0byB3aXJlIHVwIGZvdXIgZGlmZmVyZW50IEky UyBzb3VyY2VzCj4gdG8gdGhlIFREQTk5OHguCj4gCj4gUmVtZW1iZXIsIGFuIEkyUyBzb3VyY2Ug cHJvZHVjZXMgdGhlIEkyUyBkYXRhIGFuZCB0aGUgd29yZCBjbG9jayAtIHRoYXQncwo+IHR3byBv dXRwdXRzLiAgWW91IGNhbid0IGVsZWN0cm9uaWNhbGx5IHdpcmUgdGhlIHdvcmQgY2xvY2tzIHRv Z2V0aGVyLgoKRnJvbSB0aGUgc3BlYywgdGhlIHRkYTk5OHggZ2V0cyBpbmRlcGVuZGVudGx5IHRo ZSBzZXJpYWwgY2xvY2sgYW5kIHRoZQpzZXJpYWwgd29yZCBzZWxlY3QgZnJvbSBlYWNoIEkyUyAo c3RlcmVvKSBpbnB1dCBjaGFubmVsICg9IGF1ZGlvIHBpbiksCnNvLCB5b3UgbWF5IGhhdmUgNCBh dWRpbyBjaGlwcyBnaXZpbmcgNCBpbmRlcGVuZGVudCBhdWRpbyBzdHJlYW1zLgpJIGRvbid0IGtu b3cgd2hhdCBjYW4gYmUgdGhlIHJlc3VsdCBpbiBIRE1JIGlmIHRoZXNlIHN0cmVhbXMgYXJlIGFj dGl2ZWQKYXQgdGhlIHNhbWUgdGltZSEKCkluIHRoZSBvdGhlciBjb25maWd1cmF0aW9uLCBhbiBh dWRpbyBjaGlwIG1heSBoYXZlIDQgc3luY2hyb25pemVkIHN0ZXJlbwpjaGFubmVscyAoc29mdHdh cmUgUENNcykuIFRoZXNlIG9uZXMgbWF5IGJlIGNvbnNpZGVyZWQgYXMgb25lIGxpbmsgKG9uZQpw b3J0IG91dCBmcm9tIHRoZSBhdWRpbyBjaGlwIHRvIG9uZSBwb3J0IGluIHRvIHRoZSB0ZGE5OTh4 KSwgdGhlIEFQCmNvbmZpZ3VyYXRpb24gYmVpbmcgMHgxZi4KCi0tIApLZW4gYXIgYydoZW50YcOx CXwJICAgICAgKiogQnJlaXpoIGhhIExpbnV4IGF0YXYhICoqCkplZgkJfAkJaHR0cDovL21vaW5l amYuZnJlZS5mci8KX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X18KZHJpLWRldmVsIG1haWxpbmcgbGlzdApkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3Jn Cmh0dHA6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9kcmktZGV2ZWwK From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753832AbbAMTDM (ORCPT ); Tue, 13 Jan 2015 14:03:12 -0500 Received: from smtp6-g21.free.fr ([212.27.42.6]:5987 "EHLO smtp6-g21.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752266AbbAMTDK convert rfc822-to-8bit (ORCPT ); Tue, 13 Jan 2015 14:03:10 -0500 Date: Tue, 13 Jan 2015 20:02:52 +0100 From: Jean-Francois Moine To: Russell King - ARM Linux Cc: Philipp Zabel , Andrew Jackson , Jyri Sarha , Mark Brown , Dave Airlie , "alsa-devel@alsa-project.org" , "devicetree@vger.kernel.org" , "dri-devel@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v9 1/4] drm/i2c: tda998x: Add DT support for audio Message-ID: <20150113200252.3dbfab14@armhf> In-Reply-To: <20150113160313.GR12302@n2100.arm.linux.org.uk> References: <20150109200127.GD12302@n2100.arm.linux.org.uk> <1421054728.3081.28.camel@pengutronix.de> <20150112122527.GF12302@n2100.arm.linux.org.uk> <1421071197.3081.44.camel@pengutronix.de> <20150112140456.GI12302@n2100.arm.linux.org.uk> <20150112181341.4a53ea24@armhf> <20150112175705.GN12302@n2100.arm.linux.org.uk> <1421151718.4519.24.camel@pengutronix.de> <20150113122715.GP12302@n2100.arm.linux.org.uk> <20150113165411.5469930d@armhf> <20150113160313.GR12302@n2100.arm.linux.org.uk> X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.25; arm-unknown-linux-gnueabihf) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 13 Jan 2015 16:03:13 +0000 Russell King - ARM Linux wrote: > On Tue, Jan 13, 2015 at 04:54:11PM +0100, Jean-Francois Moine wrote: > > 4 streams on 4 different APs (sources) should work, but 4 streams from > > a same source should be detailed. > > I'd like to know how you intend to wire up four different I2S sources > to the TDA998x. > > Remember, an I2S source produces the I2S data and the word clock - that's > two outputs. You can't electronically wire the word clocks together. >>From the spec, the tda998x gets independently the serial clock and the serial word select from each I2S (stereo) input channel (= audio pin), so, you may have 4 audio chips giving 4 independent audio streams. I don't know what can be the result in HDMI if these streams are actived at the same time! In the other configuration, an audio chip may have 4 synchronized stereo channels (software PCMs). These ones may be considered as one link (one port out from the audio chip to one port in to the tda998x), the AP configuration being 0x1f. -- Ken ar c'hentañ | ** Breizh ha Linux atav! ** Jef | http://moinejf.free.fr/