From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xuebing Wang Subject: Re: Can iMX6SL supports different sampling rate for different SSIs? Date: Tue, 17 Mar 2015 08:45:06 +0800 Message-ID: <55077912.1020102@gmail.com> References: <5507743B.5040808@gmail.com> <20150317003830.GA552@Asurada-GSX> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-qc0-f170.google.com (mail-qc0-f170.google.com [209.85.216.170]) by alsa0.perex.cz (Postfix) with ESMTP id 636D6261A18 for ; Tue, 17 Mar 2015 01:45:13 +0100 (CET) Received: by qcaz10 with SMTP id z10so60544204qca.1 for ; Mon, 16 Mar 2015 17:45:10 -0700 (PDT) In-Reply-To: <20150317003830.GA552@Asurada-GSX> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Nicolin Chen Cc: alsa-devel@alsa-project.org, niranjan Patil , Richard Jiang List-Id: alsa-devel@alsa-project.org Nicolin, thank you very much. On 03/17/2015 08:38 AM, Nicolin Chen wrote: > On Tue, Mar 17, 2015 at 08:24:27AM +0800, Xuebing Wang wrote: > >> 2) As pll4_main_clk is global for all 3 SSIs, I think that we can *not* use >> 8k for ssi1 and 44.1k for ssi2, right? Because 8k and 44.1k requires >> different pll4 clock, right? > True. > >> -- However, as 48k, 32k, 16k, 8k can use same pll4, thus different SSI >> can use different sampling rate in this subset (48k, 32k, 16k, 8k). >> -- Same principle applies for 44.1k, 22.050, 11.025 subset of sampling >> rates. > Correct. You need to choose 48K-group or 44.1K-group if only using PLL4. > > If you are so obsessed with full sample rate support in hardware level, > you might need to do a trade-off like sacrificing video function -- you > would then be allowed to use PLL5 to forge a rate for another rate group. > > I forgot if PLL3, another possible parent clock of SSI, is suitable for > one of the groups. You may also take a look at it. > > Nicolin > -- Xuebing