On Wed, Aug 05, 2015 at 02:40:01PM +0200, Michal Suchanek wrote: > On 5 August 2015 at 13:50, Mark Brown <broonie@xxxxxxxxxx> wrote: > > As far as I can tell you want to set a per spi_message flag saying that > > the message is a flash read command? If that's what this is trying to > > do then why do you need to set the flag at all? If the message is in a > > clearly defined format and it's more efficient to use this mmap mode > > then surely the driver can just recognise that the format is approprate > > and switch into mmap mode without being explicitly told - I'm not clear > > what the flag adds here. > ehm, the read command is just one byte. > I don't think sending 03 or other random byte as the first byte of a > SPI transfer can be used as reliable detection that we are talking to > a SPI flash memory. Why care - if something is physically in the same format as a flash read command how would a device be able to tell that it wasn't actually a flash read command? The signals sent on the bus are going to be identical anyway.
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