From: Stewart Smith <stewart@linux•vnet.ibm.com>
To: Michael Bringmann <mwb@linux•vnet.ibm.com>,
linuxppc-dev@lists•ozlabs.org
Subject: Re: [RFC] powerpc/devtree: Parse new DRC mem/cpu/dev device tree elements
Date: Tue, 15 Mar 2016 14:03:57 +1100 [thread overview]
Message-ID: <87twk85tnm.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <56E5AEDA.3050608@linux.vnet.ibm.com>
Michael Bringmann <mwb@linux•vnet.ibm.com> writes:
> Summary: The following properties: ibm,drc-indexes, ibm,drc-names,=20
> ibm,drc-types and ibm,drc-power-domains will be combined and condensed=20
> into the single property, ibm,drc-info.
>
> The ibm,dynamic-memory property will be condensed into a new version,=20
> ibm,dynamic-memory-v2.
>
> Note: "[PATCH] powerpc/devtree: Parse new DRC mem/cpu/dev device tree=20
> elements" is withdrawn at this time.
>
>
> Several properties in the DRC device tree format are replaced by
> more compact representations to allow, for example, for the encoding
> of vast amounts of memory, and or reduced duplication of information
> in related data structures.
>
> "ibm,drc-info": This property, when present, replaces the following
> four properties: =E2=80=9Cibm,drc-indexes=E2=80=9D, =E2=80=9Cibm,drc-name=
s=E2=80=9D, =E2=80=9Cibm,drc-types=E2=80=9D
> and =E2=80=9Cibm,drc-power-domains=E2=80=9D. This property is defined fo=
r all
> dynamically reconfigurable platform nodes. The "ibm,drc-info" elements
> are intended to provide a more compact representation, and reduce some
> search overhead.
>
> "ibm,dynamic-memory-v2": This property replaces the "ibm,dynamic-memory"
> node representation within the "ibm,dynamic-reconfiguration-memory"
> property. This element format is intended to provide a more compact
> representation of memory, especially, for systems with massive amounts
> of RAM.
>
> "ibm,architecture.vec": Bit flags are added to this data structure
> by the front end processor to inform the kernel as to whether to expect
> the changes to one or both of the device tree structures "ibm,drc-info"
> and "ibm,dynamic-memory-v2".
>
> The new element structures, "ibm,dynamic-memory-v2" and "ibm,drc-info",
> should completely replace the previously used structures at execution.
>
> Signed-off-by: Michael Bringmann <mwb@linux•vnet.ibm.com>
> ---
Documentation/devicetree/bindings ? or link to PAPR where it's specified?
--=20
Stewart Smith
OPAL Architect, IBM.
next prev parent reply other threads:[~2016-03-15 3:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-13 18:18 [RFC] powerpc/devtree: Parse new DRC mem/cpu/dev device tree elements Michael Bringmann
2016-03-15 3:03 ` Stewart Smith [this message]
[not found] <mailman.1273.1458018931.5573.linuxppc-dev@lists.ozlabs.org>
2016-04-19 14:46 ` [RFC] powerpc/devtree: Parse new DRC mem/cpu/dev device, " Michael Bringmann
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