[Fwd: [PATCH Resend 01/02] Add Linux ASMP support for MPC8641D]
Kumar Gala
galak at kernel.crashing.org
Fri Mar 23 02:40:57 EST 2007
On Mar 22, 2007, at 10:32 AM, Yoder Stuart-B08248 wrote:
>
>> + mpic: pic at 40000 {
>> + clock-frequency = <0>;
>> + interrupt-controller;
>> + #address-cells = <0>;
>> + #interrupt-cells = <2>;
>> + reg = <40000 40000>;
>> + built-in;
>> + compatible = "chrp,open-pic";
>> + device_type = "open-pic";
>> + big-endian;
>> + interrupts = <
>> + 18 2 49 2 19 2
>> + 2a 2 2b 2 4a 1
>> + 1d 2 1e 2 22 2
>> + 23 2 24 2 28 2
>> + >;
>> + };
>> + };
>> +};
>
> I think using the 'interrupts' property in this way is bad. It's
> being used to tell the pic which interrupts belong to it.
>
> The problem is that the interrupts property is being overloaded
> and used for a completely different purpose than that which
> it was originally intended and documented. Interrupt controllers
> should not have an interrupts property.
>
> The only reason I can see to do this is as a convenience to avoid
> walking the device tree. The pic code should walk the device tree
> to determine the irq numbers the running core.
We could just add a flag to skip the initialization of these regs @
mpic_init and let set_irq_type do it.
- k
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