-------- Original-Nachricht --------
Datum: Tue, 19 Jun 2007 08:08:42 +0200
Von: Segher Boessenkool [off-list ref]
An: "Gerhard Pircher" [off-list ref]
CC: ppcdev list <redacted>
Betreff: Re: [RFC] Device tree for new desktop platform in arch/powerpc

Just name the cpu nodes "cpu@0" etc.  The "generic names"
recommended practice wants this, and the node names here
aren't actually used by anything anyway, except they look
nice to the user.  The PowerPC ISA binding predates the
generic names r.p. btw.

Good! That simplifies the (yet to be written) amigaone-cuboot.c
bootwrapper code a lot.

quoted

3. The dts files define the device_type of a serial port as "serial", 
whereas the OF spec says "pnpPNP,501". What's the difference between 
the two?

"device_type" is "serial", "compatible" is "pnpPNP,whatever".

Sorry, I was thinking about compatible = "ns16550" and
compatible = "pnp..", but wrote device_type = "serial".
What's the difference between "ns16550" and "pnpPNP,501"?

Where in the OF specs did you find this pnpPNP thing btw?

See here:
http://playground.sun.com/1275/bindings/devices/html/serial.html

or

Quote from the document:

 "compatible" S
Standard property name, specifies device names with which this
device is compatible.

The meaning of this property is as defined in Open Firmware,
as modified by the Generic Names Recommended Practice [7]. As
described in those documents, the entries are a list of device
names with which this device is compatible, starting with the
name of the device itself and progressing through successively
less precise and possibly less functional compatible devices.

For this device, the compatible property shall include "pnpPNP,501."

- End -

"name" = "device_type" = "interrupt-controller".
"compatible" is one of those pnpPNP things.

Quote from the "CHRP(TM) ISA Interrupt Controller Device
Binding" document:

"compatible" S
Standard property name, specifies device names with which
this device is compatible.
....
The compatible property shall include "chrp,iic."

- End -

I couldn't find any reference about a "pnp..." value for an i8259
interrupt controller. Is there already a generic function within the
kernel that can setup the interrupt controller based solely on the
information in the device tree?

Please send the thing inline, not as an attachment.

Okay, will do so next time.

Thanks!

regards,

Gerhard
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