[PATCH v4 2/5] drivers/of: do not add memory for unavailable nodes

[Rob Herring]

On Thu, Oct 6, 2016 at 1:36 PM, Reza Arbab <arbab at linux.vnet.ibm.com> wrote:
> Respect the standard dt "status" property when scanning memory nodes in
> early_init_dt_scan_memory(), so that if the node is unavailable, 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 at linux.vnet.ibm.com>
> ---
>  drivers/of/fdt.c | 3 +++
>  1 file changed, 3 insertions(+)

Acked-by: Rob Herring <robh at kernel.org>