From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932321Ab3FFKTc (ORCPT ); Thu, 6 Jun 2013 06:19:32 -0400 Received: from cassiel.sirena.org.uk ([80.68.93.111]:55229 "EHLO cassiel.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752203Ab3FFKTa (ORCPT ); Thu, 6 Jun 2013 06:19:30 -0400 Date: Thu, 6 Jun 2013 11:19:19 +0100 From: Mark Brown To: Illia Smyrnov Cc: Illia Smyrnov , Grant Likely , Rob Herring , Rob Landley , Daniel Mack , Matthias Brugger , Tony Lindgren , Greg Kroah-Hartman , devicetree-discuss@lists.ozlabs.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, spi-devel-general@lists.sourceforge.net Message-ID: <20130606101919.GQ31367@sirena.org.uk> References: <1370432398-7796-1-git-send-email-illia.smyrnov@ti.com> <1370432398-7796-2-git-send-email-illia.smyrnov@ti.com> <20130605115734.GY31367@sirena.org.uk> <51B05FAE.60508@ti.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="NhnzZsTWd+R/yp6D" Content-Disposition: inline In-Reply-To: <51B05FAE.60508@ti.com> X-Cookie: Are you a turtle? User-Agent: Mutt/1.5.21 (2010-09-15) X-SA-Exim-Connect-IP: 82.42.102.178 X-SA-Exim-Mail-From: broonie@sirena.org.uk Subject: Re: [PATCH 1/2] spi: spi-omap2-mcspi.c: Add dts for slave device configuration. X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:57:07 +0000) X-SA-Exim-Scanned: Yes (on cassiel.sirena.org.uk) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --NhnzZsTWd+R/yp6D Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Jun 06, 2013 at 01:08:46PM +0300, Illia Smyrnov wrote: > On 06/05/2013 02:57 PM, Mark Brown wrote: > Turbo mode gives the expected results not for all cases. There are > some limitations: > - works only if a single channel is enabled (no effect when several > channels are enable); > - improves the throughput on RX direction only; > - effective only when a transfer exceeds two words. For single SPI > word transfers OMAP TRM [1] recommends deactivate turbo mode. > So it is useful to have the property in DT, that allow us to switch > turbo mode off/on for certain slave. Why? These sound like conditions that can readily be detected at runtime. --NhnzZsTWd+R/yp6D Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.20 (GNU/Linux) iQIcBAEBAgAGBQJRsGIkAAoJELSic+t+oim9RocP/R1iT4kg2Q+gyyMmYSWK+dyY CYCn6FZ9drlQKYYaQTqnr8eCpDL2/6gPzRbF+xhBB6Zp1AGedlT9qdvQqySVGxCZ 0CjtipwXfm7n+Nn5doXlx+SbpvUtKSJBY4yPR94/tEBJvshw5LODBghMiUgIPLtv kx2b6ot7ma+Lliw8NUa7Js+dDCgArYz9dTK8Kxezz0/Ujlfv1eeu9SuhwakaT5eQ JvsgqNHRSPgkcWpstU2zOpiqV9Fd9SoyxD7SJ8RcKsrKJ1zFP82vDMQOOG7oBcMj n3/qVtzAiPl1Vmj0qljZsf3EhLzyxRBxPtr3oRx5KfhaRI9rh2aOrFpy92K5L573 cT9FOiGC9zvr7mCuPA1sGsOBl7zN7RzBP42meS4qSJbVUNpMFvZlr+bCGdUluC2x fDYHoCKyJGkvgU2esotWg9/bTfe5wGbGu1e+ian5bJHZMagfnAkmw3Yz1abpXfgI zZAm7uqu6g8Se+mHqaNv4WeHf+QdT9NU4qXbcEro/36YyP4bn1KI2CBjyNa2v3ov DOFEezQO6pUMmhVGM7jG9lfLFXj+Ara5i4VrfMb7KJKveU49AKewVUOM7E1YCOpV drZahuIHYPnUIFOB/lddMYPJ2MketnjBV7qW1ZUO+bay9jzPKQfl1/4b2Uu5WMSa rMamq1XMSMk1SybCmHgB =kwNA -----END PGP SIGNATURE----- --NhnzZsTWd+R/yp6D--