Messages in this thread | | | Subject | Re: [PATCH v15 3/8] mfd: simple-mfd-i2c: Enable support for the silergy,sy7636a | From | Guenter Roeck <> | Date | Wed, 24 Nov 2021 14:56:46 -0800 |
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On 11/24/21 2:50 PM, Andreas Kemnade wrote: > On Wed, 24 Nov 2021 12:09:44 -0800 > Guenter Roeck <linux@roeck-us.net> wrote: > >> On 11/24/21 11:35 AM, Andreas Kemnade wrote: >>> Hi, >>> >>> On Tue, 23 Nov 2021 07:39:05 -0800 >>> Guenter Roeck <linux@roeck-us.net> wrote: >>> >>>> 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: >>>> >>> yes, they have. The only question is where it starts. So did you find a >>> public datasheet which you can chere >>> >> >> I registered an account on the Silergy web site, and I was subsequently >> able to download the datasheet. The document has a "confidential" >> watermark, so I can not share it. You should be able to register an >> account and download it yourself, though. >> > ok, did so. > >>>> 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".
Guenter
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