Re: [PATCH v15 3/8] mfd: simple-mfd-i2c: Enable support for the silergy,sy7636a

[Guenter Roeck]

On 11/23/21 4:14 AM, Alistair Francis wrote:
> On Tue, Nov 16, 2021 at 9:10 AM Andreas Kemnade <andreas@xxxxxxxxxxxx> wrote:
> > 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