From: Paul Brook <paul@codesourcery.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: Peter Crosthwaite <peter.crosthwaite@petalogix.com>,
edgar.iglesias@gmail.com, qemu-devel@nongnu.org,
john.williams@petalogix.com
Subject: Re: [Qemu-devel] [RFC PATCH v1 1/4] SPI: initial support
Date: Tue, 3 Apr 2012 22:22:21 +0100 [thread overview]
Message-ID: <201204032222.21836.paul@codesourcery.com> (raw)
In-Reply-To: <CAFEAcA-Ecpgy6=6MJzq8os182hKXBai5UtKorQvGqkewED7kug@mail.gmail.com>
> 2012/4/3 Paul Brook <paul@codesourcery.com>:
> >> > I'm no SPI expert, but a bit of googling suggests that it's
> >> > a synchronous duplex bus, so you always send a byte of data
> >> > to the slave and get one back in return (even if for some slaves
> >> > it might be random garbage).
> >
> > Waitaminute. So this is just basic synchronous serial?
> >
> > We already have an API for this. hw/spi.c.
>
> Er, no we don't, not in upstream QEMU. You'll notice that
> the patch we're discussing creates hw/spi.c as a new file...
Sorry, I mean hw/ssi.c
Synchronous serial is something that pretty much every vendor has their own
name for, but in practice they're actually all the same.
Paul
next prev parent reply other threads:[~2012-04-03 21:21 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-30 6:37 [Qemu-devel] [RFC PATCH v1 0/4] SPI bus support + Xilinx SPI controller Peter A. G. Crosthwaite
2012-03-30 6:37 ` [Qemu-devel] [RFC PATCH v1 1/4] SPI: initial support Peter A. G. Crosthwaite
2012-03-30 7:37 ` Peter Maydell
2012-03-30 7:50 ` Peter Crosthwaite
2012-04-02 17:39 ` Peter Maydell
2012-04-02 23:51 ` Peter Crosthwaite
2012-04-03 0:48 ` Peter Crosthwaite
2012-04-03 17:45 ` Paul Brook
2012-04-03 18:08 ` Peter Maydell
2012-04-03 21:22 ` Paul Brook [this message]
2012-04-04 0:48 ` Peter Crosthwaite
2012-04-04 16:52 ` Paul Brook
2012-04-05 0:32 ` Peter Crosthwaite
2012-04-05 7:18 ` Peter Maydell
2012-04-02 23:57 ` Peter Crosthwaite
2012-04-03 0:27 ` Andreas Färber
2012-03-30 6:37 ` [Qemu-devel] [RFC PATCH v1 2/4] m25p80: initial verion Peter A. G. Crosthwaite
2012-04-03 7:03 ` Stefan Hajnoczi
2012-04-04 12:53 ` Andreas Färber
2012-06-05 0:47 ` Peter Crosthwaite
2012-06-05 12:38 ` Andreas Färber
2012-03-30 6:37 ` [Qemu-devel] [RFC PATCH v1 3/4] xilinx_spi: initial version Peter A. G. Crosthwaite
2012-03-30 6:37 ` [Qemu-devel] [RFC PATCH v1 4/4] petalogix-ml605: added spi controller with m25p80 Peter A. G. Crosthwaite
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