On 11/23/21 4:14 AM, Alistair Francis wrote:

On Tue, Nov 16, 2021 at 9:10 AM Andreas Kemnade [off-list ref] wrote:

quoted

Hi,

this all creates a lot of question marks...
One of my main question is whether sy7636a = sy7636 (at least the
driver in the kobo vendor kernels does not have the "A" at the end,
whic does not necessarily mean a difference).

https://www.silergy.com/products/panel_pmic
lists only a SY7636ARMC, so chances are good that the letters were just
stripped away by the driver developers. Printing on chip package is
cryptic so it is not that helpful. It is just "BWNBDA"

I don't have a definite answer for you. But I think it's sy7636a

The page you linked to above lists SY7636ARMC as well as SY7627RMC,
SY7570RMC. That makes me think that the RMC is a generic suffix and
this actual IC is the SY7636A.

Almost all chips have an ordering suffix, indicating things like
temperature range or packaging. The datasheet says:

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

The datasheet otherwise refers to the chip as SY7636A.

Guenter