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

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Date:   Tue, 23 Nov 2021 07:39:05 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Alistair Francis <alistair23@...il.com>,
        Andreas Kemnade <andreas@...nade.info>
Cc:     Alistair Francis <alistair@...stair23.me>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>, lgirdwood@...il.com,
        Rob Herring <robh+dt@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        rui.zhang@...el.com, devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        linux-hwmon@...r.kernel.org, amitk@...nel.org,
        linux-pm@...r.kernel.org, dl-linux-imx <linux-imx@....com>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH v15 3/8] mfd: simple-mfd-i2c: Enable support for the
 silergy,sy7636a

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