[PATCH 1/3] doc: bindings: Add bindings documentation for mtd nvmem

[Alban]

On Thu, 2 Mar 2017 21:22:20 +0100
Boris Brezillon <boris.brezillon at free-electrons.com> wrote:

> On Thu,  2 Mar 2017 20:50:21 +0100
> Alban <albeu at free.fr> wrote:
> 
> > Add the binding to expose MTD partitions as nvmem providers.  
> 
> Looks good. Maybe you should take the case you describe in your
> cover-letter into account and add an extra layer: add an nvmem sub-node
> containing the nvmem cells, so that you can expose nvmem cells directly
> under master MTD devices (and not only partitions). 

I think that would be the better solution. This can be done
independently, once we agree on a binding we just have to fix
of_nvmem_cell_get(). My suggestion would be to have the new binding
looking like this:

nvmem-device at 10 {
	...
	nvmem-provider;
	nvmem-cells {
		compatible = "nvmem-cells";
		#address-cells = <1>;
		#size-cells = <1>;

		nvmem-cell at 100 {
			label = "mac-address";
			reg = <0x100 0x200>;
		}

		...
	}
}

I would also suggest making the "nvmem-provider" property mandatory
to indicate that the device provides this capability. Up to now all
nvmem providers only support this API but I think there might be more
multi function devices in the future.

Alban
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