From: Paul Brook <paul@codesourcery.com>
To: Peter Crosthwaite <peter.crosthwaite@petalogix.com>
Cc: Peter Maydell <peter.maydell@linaro.org>,
qemu-devel@nongnu.org, john.williams@petalogix.com,
edgar.iglesias@gmail.com
Subject: Re: [Qemu-devel] [RFC PATCH v1 1/4] SPI: initial support
Date: Tue, 3 Apr 2012 18:45:09 +0100 [thread overview]
Message-ID: <201204031845.09827.paul@codesourcery.com> (raw)
In-Reply-To: <CAEgOgz4-oxai_Yyc8jkxiSNxZkG8HVdNn9tV7BNb2rqjTXgDVg@mail.gmail.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.
If you're building higer level protocols they should be layered on top of the
SPI, same as smbus is a protocol layer on top of I2C.
Paul
next prev parent reply other threads:[~2012-04-03 17:45 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 [this message]
2012-04-03 18:08 ` Peter Maydell
2012-04-03 21:22 ` Paul Brook
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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