From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars-Peter Clausen Subject: Re: simple-audio-card vs. platform question Date: Tue, 27 Jan 2015 13:29:03 +0100 Message-ID: <54C7848F.6070903@metafoo.de> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from smtp-out-180.synserver.de (smtp-out-180.synserver.de [212.40.185.180]) by alsa0.perex.cz (Postfix) with ESMTP id AA295260715 for ; Tue, 27 Jan 2015 13:29:04 +0100 (CET) In-Reply-To: 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: Ricard Wanderlof , alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On 01/27/2015 01:01 PM, Ricard Wanderlof wrote: > > I'm trying to set up a simple device tree framework so I can do some > development on an I2S driver. I'm trying to use simple-audio-card, but I > keep running into the problem that once soc_bind_dai_link() gets called, > dai_link->platform is set to NULL (because it is not initialized by > simple-card.c when there is a DT node), while dai_link->platform_of_node > has been set to dai_link->cpu_of_node in asoc_simple_card_parse_of(). > [...] > > I can't figure out either how to set up a platform (=DMA) driver in this > environment. Perhaps the case of having a CPU DAI, DMA driver and codec > DAI is not supported by simple-audio-card? [...] Usually in such a setup the CPU DAI driver also register the platform component. Which then as the same of_node as the CPU DAI and so the matching works. There are plenty of examples e.g. check the drivers using devm_snd_dmaengine_pcm_register(). - Lars