From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751979AbcDOVU6 (ORCPT ); Fri, 15 Apr 2016 17:20:58 -0400 Received: from vern.gendns.com ([206.190.152.46]:56968 "EHLO vern.gendns.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751443AbcDOVU4 (ORCPT ); Fri, 15 Apr 2016 17:20:56 -0400 Subject: Re: [PATCH 1/3] ARM: DTS: da850: add node for spi0 To: Valdis.Kletnieks@vt.edu References: <1460586628-25152-1-git-send-email-david@lechnology.com> <1460586628-25152-2-git-send-email-david@lechnology.com> <5710C176.3040304@ti.com> <57111433.6080402@lechnology.com> <31522.1460751389@turing-police.cc.vt.edu> Cc: Sekhar Nori , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Russell King , Kevin Hilman , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org From: David Lechner Message-ID: <57115B33.90509@lechnology.com> Date: Fri, 15 Apr 2016 16:20:51 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: <31522.1460751389@turing-police.cc.vt.edu> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - vern.gendns.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - lechnology.com X-Get-Message-Sender-Via: vern.gendns.com: authenticated_id: davidmain+lechnology.com/only user confirmed/virtual account not confirmed X-Authenticated-Sender: vern.gendns.com: davidmain@lechnology.com X-Source: X-Source-Args: X-Source-Dir: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/15/2016 03:16 PM, Valdis.Kletnieks@vt.edu wrote: > On Fri, 15 Apr 2016 11:17:55 -0500, David Lechner said: > >> I omitted this on purpose. For my use case, I am using the SPI as >> write-only, > > So your SPI accesses are fire-and-forget, and nothing ever comes back? Yes. > Seems a very dangerous way to design the use case, with no feedback if > something suddenly goes pear-shaped... You should tell Sitronix. This is how their display controllers work. > > Or do you have ways to verify the status via some method other than SPI? > Nope. I'm working with LEGO MINDSTORMS EV3, a mass-produced robotics system. It is what it is. And I have a logic analyzer for when things go pear-shaped. ;-)