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=-2.6 required=3.0 tests=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 714BDC3567B for ; Thu, 27 Feb 2020 16:44:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 48644246A1 for ; Thu, 27 Feb 2020 16:44:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582821869; bh=nWu1okJnNKy5+8DUQPfUbsYZ9Uq1XCSR5IFmdX8W/e8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=BtxKV4+8eT9StsN62SSLuFZARt2lvtO5WOXlUgkTcfLPLqv3mWrJiFrR4LKiNCT4H UACafs3r0LQThOJvX6yMUNjwplTmOBZJ8P8TZ6w5qJS11fMX9XJxIKc/lpnJLmJewU bVRPehE2kVd0IDpKl0Ok3o/LiDx5Vq88CF2iRXaY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730418AbgB0Qo2 (ORCPT ); Thu, 27 Feb 2020 11:44:28 -0500 Received: from foss.arm.com ([217.140.110.172]:54650 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729146AbgB0Qo2 (ORCPT ); Thu, 27 Feb 2020 11:44:28 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6C6DD1FB; Thu, 27 Feb 2020 08:44:27 -0800 (PST) Received: from localhost (unknown [10.37.6.21]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D6EA63F7B4; Thu, 27 Feb 2020 08:44:26 -0800 (PST) Date: Thu, 27 Feb 2020 16:44:25 +0000 From: Mark Brown To: Geert Uytterhoeven Cc: Boris Brezillon , Mark Rutland , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , Vignesh Raghavendra , Tudor Ambarus , Richard Weinberger , Sekhar Nori , Linux Kernel Mailing List , linux-spi , Rob Herring , MTD Maling List , Miquel Raynal , Pratyush Yadav Subject: Re: [PATCH v2 01/11] dt-bindings: spi: allow expressing DTR capability Message-ID: <20200227164425.GF4062@sirena.org.uk> References: <20200226093703.19765-1-p.yadav@ti.com> <20200226093703.19765-2-p.yadav@ti.com> <20200227171147.32cc6fcf@collabora.com> <20200227162842.GE4062@sirena.org.uk> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="1Ow488MNN9B9o/ov" Content-Disposition: inline In-Reply-To: X-Cookie: Edwin Meese made me wear CORDOVANS!! User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --1Ow488MNN9B9o/ov Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Feb 27, 2020 at 05:40:31PM +0100, Geert Uytterhoeven wrote: > On Thu, Feb 27, 2020 at 5:28 PM Mark Brown wrote: > > It's what we do for other properties, and if this is anything like the > > other things adding extra wiring you can't assume that the ability to > > use the feature for TX implies RX. > Double Transfer Rate uses the same wire. But is it still on either the TX or RX signals? > But as you sample at both the rising and the falling edges of the clock, this > makes the cpha setting meaningless for such transfers, I think ;-) Might affect what the first bit is possibly? > However, as the future may bring us QDR, perhaps this should not be a > boolean flag, but an integer value? > Cfr. spi-tx-bus-width vs. the original spi-tx-dual/spi-tx-quad proposal. > What would be a good name (as we only need one)? spi-data-phases? Sounds reasonable, apart from the increasingly vague connection with something that's recognizably SPI :P --1Ow488MNN9B9o/ov Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAl5X8egACgkQJNaLcl1U h9BzNQf+NjXmaGigWO8AYKixlBbcKDms48SbjmC3B/TKWN72uzEK1Ir+m0zbDH/k 3rRhBD0UEIitRKr7B3yHGk5dJY0A3yZuSqsmXm6EW05qo65DwU2595xG4Q7lAk35 enegdQQEG9axlL02UaRgms5zlb7znVK/DqAqzjLB6NUv4AjBs8OJVK2RCLwXhvx3 c1W2kmWHZ5i9EXY21cCmQytqMlkJnOnHfYLoafYvVeqLFS1ddty4GNFsXdY+F14Z EpXoakYtdKqZyX5SFRw6ymAZUU/O6qPiyv6ipnpOfu/pFazvJ+NByzx8FDy6bUEt uOZ2YaN/cmD3HqhSb6dp4iTXWLLzzQ== =jCkC -----END PGP SIGNATURE----- --1Ow488MNN9B9o/ov--