[PATCH 1/2] powerpc: document the MPIC device tree binding

Yoder Stuart-B08248 B08248 at freescale.com
Thu Jan 20 09:14:42 EST 2011


> +** Optional properties:
> +
> +   - no-reset : The presence of this property indicates that the MPIC
> +                should not be reset during runtime initialization.
> +   - protected-sources : Specifies a list of interrupt sources that are
> + not
> +                         available for use and whose corresponding
> + vectors
> +                         should not be initialized.  A typical use case
> + for
> +                         this property is in AMP systems where multiple
> +                         independent operating systems need to share
> + the MPIC
> +                         without clobbering each other.

Is "protected-sources" really needed for AMP systems to
tell the OSes not to clobber each other?  Won't each
OS be given a device tree with only its interrupt
sources?  ...so you know what you are allowed to touch.

Stuart



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