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

Guenter Roeck
2021-11-23T15:39:13Z

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