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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 D3D81C433E0 for ; Thu, 2 Jul 2020 12:11:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE53E20772 for ; Thu, 2 Jul 2020 12:11:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="R2v8R1eV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728889AbgGBMLv (ORCPT ); Thu, 2 Jul 2020 08:11:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53998 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728847AbgGBMLu (ORCPT ); Thu, 2 Jul 2020 08:11:50 -0400 Received: from mail-io1-xd43.google.com (mail-io1-xd43.google.com [IPv6:2607:f8b0:4864:20::d43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1F034C08C5DC for ; Thu, 2 Jul 2020 05:11:50 -0700 (PDT) Received: by mail-io1-xd43.google.com with SMTP id i25so28693763iog.0 for ; Thu, 02 Jul 2020 05:11:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=Eko+gn0fkmzl4T2A9QdkZYyOUJF1wHLJbPljdEltVCA=; b=R2v8R1eV5f5iZFqO/jR3pPAVbXcWdQ6FeiosC78q3cOfexYhLL8OcMLS9rxsBo4CLK y5pUbReiCH9H51dEGxWSju7nkQdcyn3d2ZTw59pjkKl1EprczM0wGfqww+XrwozCLRTS Vb9CHuoTLJlGYFVK2dGb6aLjeNXsV7RTeTBHEHCOCV0PcANW6j4NlqhTBkD3mG/TLfp7 5CrrwfAPo0M4c55r1Co2jye5jkh54mXg1dT0Ju0ozehQzRiF8wAvA/tN2MaFM9TKS4O4 gSHTr5f1Wjr+5gd9wqq2Jmj3blWRmMWaP9VOjWk7sDVIym91exPVpvSjVY5MTtwaC2As Trpg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=Eko+gn0fkmzl4T2A9QdkZYyOUJF1wHLJbPljdEltVCA=; b=uEn5YZa7vcE/GPjJGVnJLLY0Yzs2XqFbT+sCKTEAGlLVpRYOaFf/iJ7Yn1y84+Rf2V J2Iq7qt/1Gl5JzgBjzCfG9uV3iNrKlvJ24EC9PMXjP+dboeI2/IgIk5U/rtf5MDmAXSP 2ESw6KZBZvZ/LU2lCn+Mdb16nizdSsZVcTzZJx/AuPnfrfcvh9j1GbaG29ckbZPQPoN7 rjTfdOuT1ZuvPxgw0M8UPwxKiU+ti5hUlguHcxyUTH715n6raRpT7ty1PN8jzDOsdB0+ MiGy2M5/ma2ExlzozX3CtG4mCZZoNAmnGpP9VWugXUkCP6WzQm1N/nLHi2gArlPD1l1i A0rA== X-Gm-Message-State: AOAM532hqDFpTiZwRkj13kS4898Hbb/U9sNgZJTMYTaskTX7BcVVufo9 AmjM5QdFeHXKRj+hJGJFdUFx/g== X-Google-Smtp-Source: ABdhPJy/shl/mAgwE1EfUHmMNq2s5flqydDJz4n59Pooo5wlRJyXvKvt1jDoIhOQqX0FClsAuNVGmg== X-Received: by 2002:a05:6638:2172:: with SMTP id p18mr34514093jak.63.1593691909301; Thu, 02 Jul 2020 05:11:49 -0700 (PDT) Received: from ziepe.ca ([206.223.160.26]) by smtp.gmail.com with ESMTPSA id a20sm4943502ila.5.2020.07.02.05.11.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Jul 2020 05:11:48 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.93) (envelope-from ) id 1jqy4B-002qcB-M8; Thu, 02 Jul 2020 09:11:47 -0300 Date: Thu, 2 Jul 2020 09:11:47 -0300 From: Jason Gunthorpe To: Mark Brown Cc: Ranjani Sridharan , Greg KH , Takashi Iwai , Pierre-Louis Bossart , Jeff Kirsher , davem@davemloft.net, netdev@vger.kernel.org, linux-rdma@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com, Fred Oh , lee.jones@linaro.org Subject: Re: [net-next v4 10/12] ASoC: SOF: Introduce descriptors for SOF client Message-ID: <20200702121147.GQ25301@ziepe.ca> References: <20200527071733.GB52617@kroah.com> <20200629203317.GM5499@sirena.org.uk> <20200629225959.GF25301@ziepe.ca> <20200630103141.GA5272@sirena.org.uk> <20200630113245.GG25301@ziepe.ca> <936d8b1cbd7a598327e1b247441fa055d7083cb6.camel@linux.intel.com> <20200630172710.GJ25301@ziepe.ca> <20200701095049.GA5988@sirena.org.uk> <20200701233250.GP25301@ziepe.ca> <20200702111522.GA4483@sirena.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200702111522.GA4483@sirena.org.uk> Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Thu, Jul 02, 2020 at 12:15:22PM +0100, Mark Brown wrote: > On Wed, Jul 01, 2020 at 08:32:50PM -0300, Jason Gunthorpe wrote: > > On Wed, Jul 01, 2020 at 10:50:49AM +0100, Mark Brown wrote: > > > > Another part of this is that there's not a clean cut over between MMIO > > > and not using any hardware resources at all - for example a device might > > > be connected over I2C but use resources to distribute interrupts to > > > subdevices. > > > How does the subdevice do anything if it only received an interrupt? > > Via some bus that isn't memory mapped like I2C or SPI. > > > That sounds rather more like virtual bus's use case.. > > These are very much physical devices often with distinct IPs in distinct > address ranges and so on, it's just that those addresses happen not to > be on buses it is sensible to memory map. But platform bus is all about memmory mapping, so how does the subdevice learn the address range and properly share the underlying transport? Jason