From patchwork Tue May 24 16:39:20 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christer Weinigel X-Patchwork-Id: 9133903 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 88998607D5 for ; Tue, 24 May 2016 16:47:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7BE0B28220 for ; Tue, 24 May 2016 16:47:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6F9E22825C; Tue, 24 May 2016 16:47:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8CB5228220 for ; Tue, 24 May 2016 16:47:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756379AbcEXQrR (ORCPT ); Tue, 24 May 2016 12:47:17 -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 Received: by zoo.weinigel.se (Postfix, from userid 1000) id 8824E187A9D; Tue, 24 May 2016 18:39:30 +0200 (CEST) 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-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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"; + };