From mboxrd@z Thu Jan 1 00:00:00 1970 From: Balbir Singh Subject: Re: [PATCH v2 1/3] drivers/of: recognize status property of dt memory nodes Date: Mon, 19 Sep 2016 20:11:39 +1000 Message-ID: References: <1473883618-14998-1-git-send-email-arbab@linux.vnet.ibm.com> <1473883618-14998-2-git-send-email-arbab@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1473883618-14998-2-git-send-email-arbab-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Reza Arbab , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Rob Herring , Frank Rowand , Jonathan Corbet , Andrew Morton Cc: Bharata B Rao , Nathan Fontenot , Stewart Smith , Alistair Popple , linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org List-Id: devicetree@vger.kernel.org On 15/09/16 06:06, Reza Arbab wrote: > Respect the standard dt "status" property when scanning memory nodes in > early_init_dt_scan_memory(), so that if the property is present and not > "okay", no memory will be added. > > The use case at hand is accelerator or device memory, which may be > unusable until post-boot initialization of the memory link. Such a node > can be described in the dt as any other, given its status is "disabled". > Per the device tree specification, > > "disabled" > Indicates that the device is not presently operational, but it > might become operational in the future (for example, something > is not plugged in, or switched off). > > Once such memory is made operational, it can then be hotplugged. > > Signed-off-by: Reza Arbab Makes sense, so basically a /memory@ with missing status or status = "okay" are added, others are skipped. No memblocks corresponding to those nodes are created either. Balbir Singh -- 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