Re: [RESEND v2 3/4] doc/devicetree: Persistent memory region bindings

On Tue, 3 Apr 2018 10:37:51 -0700
Dan Williams [off-list ref] wrote:

On Tue, Apr 3, 2018 at 7:24 AM, Oliver O'Halloran [off-list ref] wrote:

quoted

Add device-tree binding documentation for the nvdimm region driver.

Cc: devicetree@vger.kernel.org
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
---
v2: Changed name from nvdimm-region to pmem-region.
    Cleaned up the example binding and fixed the overlapping regions.
    Added support for multiple regions in a single reg.
---
 .../devicetree/bindings/pmem/pmem-region.txt       | 80 ++++++++++++++++++++++
 MAINTAINERS                                        |  1 +
 2 files changed, 81 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pmem/pmem-region.txt  

Device-tree folks, does this look, ok?

Oliver, is there any concept of a management interface to the
device(s) backing these regions? libnvdimm calls these "nmem" devices
and support operations like health status and namespace label
management.

We would need a way to have nmem and pmem-regions find each other. Since we
don't have the ACPI abstractions, the nmem region would need to add the
ability for a driver to have a phandle to the interleaving and nmem properties.

I guess that would be a separate driver, that would manage the nmem devices
and there would be a way to relate the pmem and nmems. Oliver?

Balbir Singh.