Re: [PATCH v2 2/2] net: flexcan: add transceiver switch gpios support

[Lothar Waßmann <LW@xxxxxxxxxxxxxxxxxxx>]

Hi,

Shawn Guo writes:
> On Thu, Jun 28, 2012 at 02:07:57PM +0200, Lothar Waßmann 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 Waßmann
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