Re: [PATCH v2 1/3] drivers/of: recognize status property of dt memory nodes

From: Balbir Singh
Date: Mon Sep 19 2016 - 06:11:31 EST

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 <arbab@xxxxxxxxxxxxxxxxxx>

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