From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from co1outboundpool.messaging.microsoft.com (co1ehsobe002.messaging.microsoft.com [216.32.180.185]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (Client CN "mail.global.frontbridge.com", Issuer "Microsoft Secure Server Authority" (not verified)) by ozlabs.org (Postfix) with ESMTPS id 4CBC02C007D for ; Sat, 1 Dec 2012 03:46:13 +1100 (EST) Date: Fri, 30 Nov 2012 10:45:31 -0600 From: Scott Wood Subject: Re: fsl spi questions & patch To: Frans Meulenbroeks References: In-Reply-To: (from fransmeulenbroeks@gmail.com on Wed Nov 28 03:39:22 2012) Message-ID: <1354293931.16659.13@tyr> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; delsp=Yes; format=Flowed Cc: linuxppc-dev@lists.ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 11/28/2012 03:39:22 AM, Frans Meulenbroeks wrote: > Hi, >=20 > I've been playing with spi on mpc8313e and have some things on > spi-fsl-spi.c: >=20 > Is QE useful on 8313? > I've tried it (using cpu-qe in my dts file) and see in the boot log =20 > that it > is used, but I do not really see any effect when it comes to =20 > performance or > cpu usage. 8313 does not have a QE. The "effect" when you do have a QE and use it =20 is that you can talk to the peripherals that are connected to the QE. =20 The effect when you modify the device tree to say the board has =20 hardware that it doesn't have is generally bad. -Scott=