On Wed, May 25, 2016 at 08:25:44AM -0700, Frank Rowand wrote:

On 5/24/2016 10:41 AM, Mark Rutland wrote:

quoted

On Tue, May 24, 2016 at 06:39:20PM +0200, Christer Weinigel wrote:

quoted

+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.
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html