From mboxrd@z Thu Jan 1 00:00:00 1970 From: Grant Likely Subject: Re: [PATCH 1/1 v2] of_spi: add generic binding support to specify cs gpio Date: Wed, 21 Nov 2012 15:17:12 +0000 Message-ID: <20121121151713.1F8873E0A47@localhost> References: <20121115165048.543FE3E194B@localhost> <1353007197-31491-1-git-send-email-plagnioj@jcrosoft.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org To: Jean-Christophe PLAGNIOL-VILLARD , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Return-path: In-Reply-To: <1353007197-31491-1-git-send-email-plagnioj-sclMFOaUSTBWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Sender: "devicetree-discuss" List-Id: linux-spi.vger.kernel.org On Thu, 15 Nov 2012 20:19:57 +0100, Jean-Christophe PLAGNIOL-VILLARD wrote: > This will allow to use gpio for chip select with no modification in the > driver binding > > When use the cs-gpios, the gpio number will be passed via the cs_gpio field > and the number of chip select will automatically increased with max(hw cs, gpio cs). > > So if for example the controller has 2 CS lines, and the cs-gpios > property looks like this: > > cs-gpios = <&gpio1 0 0> <0> <&gpio1 1 0> <&gpio1 2 0>; > > Then it should be configured so that num_chipselect = 4 with the > following mapping: > > cs0 : &gpio1 0 0 > cs1 : native > cs2 : &gpio1 1 0 > cs3 : &gpio1 2 0 > > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD > Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org > Cc: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org > Signed-off-by: Richard Genoud Applied, thanks. g.