From: Jean-Christophe PLAGNIOL-VILLARD Date: Thu, 15 Nov 2012 19:19:57 +0000 (+0100) Subject: of_spi: add generic binding support to specify cs gpio X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~24^2~13 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=743179849015dc71bb2ea63d8cd4bfa7fdfb4bc6;p=pandora-kernel.git of_spi: add generic binding support to specify cs gpio 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@lists.ozlabs.org Cc: spi-devel-general@lists.sourceforge.net Signed-off-by: Richard Genoud [grant.likely: fixed up type of cs count so min() can do type checking] Signed-off-by: Grant Likely --- Reading git-diff-tree failed