From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756415AbcEXQrS (ORCPT ); Tue, 24 May 2016 12:47:18 -0400 Received: from 37-46-169-123.customers.ownit.se ([37.46.169.123]:48127 "EHLO zoo.weinigel.se" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756397AbcEXQrQ (ORCPT ); Tue, 24 May 2016 12:47:16 -0400 X-Greylist: delayed 462 seconds by postgrey-1.27 at vger.kernel.org; Tue, 24 May 2016 12:47:15 EDT From: Christer Weinigel To: linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, devicetree@vger.kernel.org Cc: Christer Weinigel , Mark Brown Subject: [PATCH] devicetree - document using aliases to set spi bus number. Date: Tue, 24 May 2016 18:39:20 +0200 Message-Id: <1464107960-10775-1-git-send-email-christer@weinigel.se> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Document how to use devicetree aliases to assign a stable bus number to a spi bus. Signed-off-by: Christer Weinigel --- Trivial documentation change. Not having used devicetree that much it was surprisingly hard to figure out how to assign a stable bus number to a spi bus. Add a simple example that shows how to do that. Mark Cced as the SPI maintainer. Or should trivial documentation fixes like this be addressed to someone else? /Christer Documentation/devicetree/bindings/spi/spi-bus.txt | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt index 42d5954..c35c4c2 100644 --- a/Documentation/devicetree/bindings/spi/spi-bus.txt +++ b/Documentation/devicetree/bindings/spi/spi-bus.txt @@ -94,3 +94,13 @@ SPI example for an MPC5200 SPI bus: reg = <1>; }; }; + +Normally SPI buses are assigned dynamic bus numbers starting at 32766 +and counting downwards. It is possible to assign the bus number +statically using devicetee aliases. For example, on the MPC5200 the +"spi@f00" device above is connected to the "soc" bus. To set its +bus_num to 1 add an aliases entry like this: + + aliases { + spi1 = "/soc/spi@f00"; + }; -- 1.9.1