On Thu, Jun 11, 2015 at 06:37:51PM +0200, Cyrille Pitchen wrote: > Le 09/06/2015 19:25, Mark Brown a écrit : > > On Tue, Jun 09, 2015 at 01:53:53PM +0200, Cyrille Pitchen wrote: > >> - add new property "atmel,fifo-size" > > Why is this a property and not something we know from the IP version? > Please be aware that the VERSION register can not be used to guess the > size of FIFOs. Indeed, for a given hardware version, the SPI controller > can be integrated on Atmel SoCs with different FIFO sizes. Also the > "atmel,fifo-size" property is optional as older SPI controllers don't > embed FIFO at all. ... > Finally, on a given SoC, there can be several instances of the SPI > controller with different FIFO sizes. This explain why we'd rather use a > dedicated DT property than use the "compatible" property. > I hope these pieces of information will help to clarify this point. > Of course, we are open to other suggestions. Ugh, what a wonderfully consistent hardware design :( Please make it clear in the documentation what is going on here, this looks like an obvious bug in the DT binding - a very common pattern for bugs is to do version quirks like this as properties.
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