[PATCH v1 08/14] dt-bindings: mtd: relax the nvmem compatible string

[Michael Walle]

Am 2022-08-31 23:48, schrieb Rob Herring:
> On Thu, Aug 25, 2022 at 11:44:17PM +0200, Michael Walle wrote:
>> The "user-otp" and "factory-otp" compatible string just depicts a
>> generic NVMEM device. But an actual device tree node might as well
>> contain a more specific compatible string. Make it possible to add
>> more specific binding elsewere and just match part of the compatibles
>> here.
>> 
>> Signed-off-by: Michael Walle <michael at walle.cc>
>> ---
>>  Documentation/devicetree/bindings/mtd/mtd.yaml | 7 ++++---
>>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> In hindsight it looks like we are mixing 2 different purposes of 'which
> instance is this' and 'what is this'. 'compatible' is supposed to be 
> the
> latter.
> 
> Maybe there's a better way to handle user/factory? There's a similar
> need with partitions for A/B or factory/update.

I'm not sure I understand what you mean. It has nothing to with
user and factory provisionings.

SPI flashes have a user programmable and a factory programmable
area, some have just one of them. Whereas with A/B you (as in the
user or the board manufacturer) defines an area within a memory device
to be either slot A or slot B. But here the flash dictates what's
factory and what's user storage. It's in the datasheet.

HTH
-michael