Hi,

On Wed, 24 Nov 2021 14:56:46 -0800
Guenter Roeck [off-list ref] wrote:

[...]

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Ordering Information
SY7636 □(□□)□
               | Temperature Code (C)
            | Package Code (RM)
          | Optional Spec Code (A)

The datasheet otherwise refers to the chip as SY7636A.
    

so there is no indication of something like this where the A really
makes a difference:
     

I may be missing it, but I see nothing in the datasheet that would indicate
that or if the "A" has any relevance other than "Optional Spec Code",
and I do not see an explanation for that term either.  

well things seems to match with things I got from analysing the kobo
sources. So at least the thing in the Kobo Libra H2O seems to be that
one described in the datasheet, so we can have one sy7636a driver for
it.

BTW: If I search for a sy7636 on aliexpress I get some SO-8 lithium
charger ICs.
  

The datasheet says "PMIC for Electronic Paper Display".

Correct. And we have the silergy vendor prefix in the dt compatible, so
if some other company decides to call its chip sy7636, we can
distinguish.

Regards,
Andreas

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