On Wed, May 25, 2016 at 08:25:44AM -0700, Frank Rowand wrote: > On 5/24/2016 10:41 AM, Mark Rutland wrote: > > On Tue, May 24, 2016 at 06:39:20PM +0200, Christer Weinigel wrote: > >> +Normally SPI buses are assigned dynamic bus numbers starting at 32766 > >> +and counting downwards. It is possible to assign the bus number > >> +statically using devicetee aliases. For example, on the MPC5200 the > >> +"spi@f00" device above is connected to the "soc" bus. To set its > >> +bus_num to 1 add an aliases entry like this: > > > > As Mark Brown pointed out, this is very Linux-specific (at least in the > > wording of the above). > > > > Generally, aliases are there to match _physical_ identifiers (e.g. to > > match physical labels for UART0, UART1, and on). > > Can you point to anything in the specification or any other place that > states that aliases are for matching physical identifiers? > > Can you point to anything in the specification or any other place that > states that aliases are not to be used for anything else?
You have me there; I cannot find any wording to that effect, and I am evidently going by my understanding alone. IEEE 1275 simply states that there may be predefined aliases for a machine, or that users can create and use them dynamically. ePAPR (and the devicetree specification) only states that aliases exist, and that a client program might use them (through some means which is never described). Thanks, Mark.
