From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?utf-8?Q?Lothar_Wa=C3=9Fmann?= Subject: Re: [PATCH v2 2/2] net: flexcan: add transceiver switch gpios support Date: Thu, 28 Jun 2012 14:24:32 +0200 Message-ID: <20460.19712.158996.397146@ipc1.ka-ro> References: <1340853701-4488-1-git-send-email-shawn.guo@linaro.org> <1340853701-4488-3-git-send-email-shawn.guo@linaro.org> <4FEC329C.7070004@pengutronix.de> <20120628112111.GC22990@S2101-09.ap.freescale.net> <4FEC400F.8010506@pengutronix.de> <20120628114108.GD22990@S2101-09.ap.freescale.net> <20460.18717.17688.965250@ipc1.ka-ro> <20120628121302.GI22990@S2101-09.ap.freescale.net> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail.karo-electronics.de ([81.173.242.67]:64302 "EHLO mail.karo-electronics.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752726Ab2F1MYq (ORCPT ); Thu, 28 Jun 2012 08:24:46 -0400 In-Reply-To: <20120628121302.GI22990@S2101-09.ap.freescale.net> Sender: linux-can-owner@vger.kernel.org List-ID: To: Shawn Guo Cc: Marc Kleine-Budde , Hui Wang , "David S. Miller" , linux-arm-kernel@lists.infradead.org, linux-can@vger.kernel.org Hi, Shawn Guo writes: > On Thu, Jun 28, 2012 at 02:07:57PM +0200, Lothar Wa=C3=9Fmann wrote: > > Hi, > >=20 > > Shawn Guo writes: > > > On Thu, Jun 28, 2012 at 01:29:19PM +0200, Marc Kleine-Budde wrote= : > > > > I mean which name is more precise, do these gpio enable/standy = a "phy" > > > > or a "transceiver". For example: > > > > http://www.nxp.com/documents/application_note/AN00094.pdf, this= document > > > > says: TJA1041/1041A high speed CAN transceiver. > > > >=20 > > > Isn't term "phy" (physical interface) generally meant to be the s= ame > > > thing as "transceiver"? I just happened to like the shorter one = as > > > what Hui did in his patch. > > >=20 > > > But it does not really matter to me, will change the name since y= ou > > > care about it. > > >=20 > > A transceiver is just a dumb piece of hardware, while a PHY contain= s > > some intelligence of its own. > >=20 > Then, it sounds more like a PHY than transceiver, since it's an IC > chip with some control over it. >=20 The 'I' in 'IC' does not stand for 'intelligent', but for 'integrated'. ;) A can transceiver is usually merely a switchable buffer. There are no registers to configure it or an internal processor that does some magic. Lothar Wa=C3=9Fmann --=20 ___________________________________________________________ Ka-Ro electronics GmbH | Pascalstra=C3=9Fe 22 | D - 52076 Aachen Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10 Gesch=C3=A4ftsf=C3=BChrer: Matthias Kaussen Handelsregistereintrag: Amtsgericht Aachen, HRB 4996 www.karo-electronics.de | info@karo-electronics.de ___________________________________________________________ From mboxrd@z Thu Jan 1 00:00:00 1970 From: LW@KARO-electronics.de (=?utf-8?Q?Lothar_Wa=C3=9Fmann?=) Date: Thu, 28 Jun 2012 14:24:32 +0200 Subject: [PATCH v2 2/2] net: flexcan: add transceiver switch gpios support In-Reply-To: <20120628121302.GI22990@S2101-09.ap.freescale.net> References: <1340853701-4488-1-git-send-email-shawn.guo@linaro.org> <1340853701-4488-3-git-send-email-shawn.guo@linaro.org> <4FEC329C.7070004@pengutronix.de> <20120628112111.GC22990@S2101-09.ap.freescale.net> <4FEC400F.8010506@pengutronix.de> <20120628114108.GD22990@S2101-09.ap.freescale.net> <20460.18717.17688.965250@ipc1.ka-ro> <20120628121302.GI22990@S2101-09.ap.freescale.net> Message-ID: <20460.19712.158996.397146@ipc1.ka-ro> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, Shawn Guo writes: > On Thu, Jun 28, 2012 at 02:07:57PM +0200, Lothar Wa?mann wrote: > > Hi, > > > > Shawn Guo writes: > > > On Thu, Jun 28, 2012 at 01:29:19PM +0200, Marc Kleine-Budde wrote: > > > > I mean which name is more precise, do these gpio enable/standy a "phy" > > > > or a "transceiver". For example: > > > > http://www.nxp.com/documents/application_note/AN00094.pdf, this document > > > > says: TJA1041/1041A high speed CAN transceiver. > > > > > > > Isn't term "phy" (physical interface) generally meant to be the same > > > thing as "transceiver"? I just happened to like the shorter one as > > > what Hui did in his patch. > > > > > > But it does not really matter to me, will change the name since you > > > care about it. > > > > > A transceiver is just a dumb piece of hardware, while a PHY contains > > some intelligence of its own. > > > Then, it sounds more like a PHY than transceiver, since it's an IC > chip with some control over it. > The 'I' in 'IC' does not stand for 'intelligent', but for 'integrated'. ;) A can transceiver is usually merely a switchable buffer. There are no registers to configure it or an internal processor that does some magic. Lothar Wa?mann -- ___________________________________________________________ Ka-Ro electronics GmbH | Pascalstra?e 22 | D - 52076 Aachen Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10 Gesch?ftsf?hrer: Matthias Kaussen Handelsregistereintrag: Amtsgericht Aachen, HRB 4996 www.karo-electronics.de | info at karo-electronics.de ___________________________________________________________