From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B94CEC48BE6 for ; Wed, 16 Jun 2021 20:40:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 910D3613BD for ; Wed, 16 Jun 2021 20:40:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233610AbhFPUmk (ORCPT ); Wed, 16 Jun 2021 16:42:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:36350 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233560AbhFPUmj (ORCPT ); Wed, 16 Jun 2021 16:42:39 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E09D061076; Wed, 16 Jun 2021 20:40:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623876033; bh=mhLIWZiGeiG2xrFjpuiGWElCi/uYrQ99Uv8/gqQ5NXk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=qUajzdGGeCVQE2tR6QDK7HHm3PJpC7IP3CsF2AeFMLxGwLx9Lu4koeza4lUN+j2Re RtBQOUSxrAsTw71Op/fXcJFRzkK0e/6eqElJLtanjxwY0ZYvPdKGDMt93FYLNc4w0j OZ6XVJ0KodJeHZFSDEU9k6GOs/90t1d7yUPmENmgjnWrEPaYPzmjOrwrofRvVRi01k CrxSvL5q9HEfYl236pUogfptpAhUiY+Ayeg+NanQ+jnf8OBgy6Z5OugT1U1Ya2HLI6 M0EcsUhfOPBIb98K+WfA6yZYB5Ullzn7kgtHwYH7u6vHw8H6L9d2Rl7c9tPJp/A1qO X7bZgewuVXBEw== Date: Wed, 16 Jun 2021 21:40:12 +0100 From: Mark Brown To: Pierre-Louis Bossart Cc: Cheng-yi Chiang , Taniya Das , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , ALSA development , Banajit Goswami , Rob Herring , Stephan Gerhold , Liam Girdwood , linux-arm-msm , Patrick Lai , Takashi Iwai , Tzung-Bi Shih , Stephen Boyd , Tzung-Bi Shih , Andy Gross , Rohit kumar , Douglas Anderson , Dylan Reid , Bjorn Andersson , Judy Hsiao , "moderated list:ARM/Mediatek SoC support" Subject: Re: [PATCH] ASoC: max98357a: set channels_max to 4 Message-ID: <20210616204012.GD6418@sirena.org.uk> References: <20210526154704.114957-1-judyhsiao@chromium.org> <3501e398-dfba-43b1-4638-325a158e860d@linux.intel.com> <7748e621-ba54-db90-6b56-23e006eb1dbe@linux.intel.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="F8dlzb82+Fcn6AgP" Content-Disposition: inline In-Reply-To: <7748e621-ba54-db90-6b56-23e006eb1dbe@linux.intel.com> X-Cookie: Revenge is a form of nostalgia. User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org --F8dlzb82+Fcn6AgP Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Jun 16, 2021 at 11:23:36AM -0500, Pierre-Louis Bossart wrote: > > On this platform there is no TDM support, so there were two I2S data lines. > Interesting, I haven't seen such 'multi-lane' solutions so far for I2S. They're moderately common for high end systems (eg, you'll see surround sound systems do this) - it makes it easier to find higher performance DACs if you can use regular stereo DACs and it helps a bit with layout if you can run slower digital signals. There's controllers upstream that do this without needing to tie together multiple stereo controllers on the SoC side, one of the variants of the Samsung I2S controllers does it for example. --F8dlzb82+Fcn6AgP Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAmDKYasACgkQJNaLcl1U h9DJTgf9GVaBIAfl61pF8E56hCwdxoKRTFOYvXMS9Ro1gyi92ejk9latUAcVfHWS qyfSyeafsZNSMo4/ZHQ6hesfIikj3o7+WDlBf7f74rjQ/2sF2FKVtzqN0CG0/WQ/ 3lFWBL+U/OzQUyBp4GzjndcxgiArjFZ4FqQ0gLM/X/H+cSTThEULsPK1YVZKrbZo 2BUv284pzIGcc2+M7eJK/ssifFkGUBkRoBQGb61GKJSFP9JbWCGLN1iDpj+ruCv1 x6noeMrPikdrtg9bqg2B1xos7vBbi8fgRs/J1T6fynimQ/3G7VwBHJrX50aLoBnH 1lN8LTDUGFKCoBTiT5AUCd0K1Q1gUg== =qHwR -----END PGP SIGNATURE----- --F8dlzb82+Fcn6AgP--