[alsa-devel] [RFC PATCH 3/5] pxa: clean up the legacy SSP API

Eric Miao eric.y.miao at gmail.com
Wed Apr 29 11:14:13 CEST 2009

On Wed, Apr 29, 2009 at 4:41 PM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Wed, Apr 29, 2009 at 09:21:53AM +0100, Mark Brown wrote:
>> On Wed, Apr 29, 2009 at 08:27:06AM +0100, Russell King - ARM Linux wrote:
>> > On Tue, Apr 28, 2009 at 08:06:08PM -0300, Daniel Ribeiro wrote:
>> > > The SPI subsystem?
>> > Can the SPI system cope with the other chip being the master of the
>> > interface.  In other words, can SPI sit around primed for a transfer,
>> > and notify the user of SPI that new data has arrived?
>> > If not, the SPI subsystem is totally unsuitable for this.
>> It's slave only at the minute - there's holes in the API someone could
>> fill in but that's not happened yet.
> Well, I guess someone else will have to do that; I don't spend much time
> on the LX stuff, and so if it requires any time consuming work, it won't
> be worth trying to get it into mainline.

However, the patch itself doesn't looks like to be a SPI slave
(I mean from the view of the processor).

'struct spi_message' does support simultaneous rx/tx transfer
and multiple such transfers being queued.

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