Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49469C433FE for ; Wed, 24 Nov 2021 19:35:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351447AbhKXTjD (ORCPT ); Wed, 24 Nov 2021 14:39:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34630 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243525AbhKXTjC (ORCPT ); Wed, 24 Nov 2021 14:39:02 -0500 Received: from mail.andi.de1.cc (mail.andi.de1.cc [IPv6:2a01:238:4321:8900:456f:ecd6:43e:202c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CC930C061574; Wed, 24 Nov 2021 11:35:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=kemnade.info; s=20180802; h=Content-Transfer-Encoding:Content-Type: MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To:From:Date:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Q0t2vlvXal39O8KUBbebiSGPvmsmjja+oK/ATdwZIWs=; b=eYVULo7WCY/ampnVyzdqu4sNfE 3+lmQOXnfng4jSiy0XvGS8o9kzDzoxc/87aKd5D1h2a5zHuhd+8ADwqu0FTIkT9Cm/u7l7Sa2cS5k 8AtXiB4TiMfbbYKP1fF84CTpzMqVI4k1fSMkaIIgXksXZ0cvuP25Oc/nWz7OZMUUawRQ=; Received: from p200300ccff0d65001a3da2fffebfd33a.dip0.t-ipconnect.de ([2003:cc:ff0d:6500:1a3d:a2ff:febf:d33a] helo=aktux) by mail.andi.de1.cc with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1mpy3J-0007MB-IZ; Wed, 24 Nov 2021 20:35:33 +0100 Date: Wed, 24 Nov 2021 20:35:32 +0100 From: Andreas Kemnade To: Guenter Roeck Cc: Alistair Francis , Alistair Francis , Lee Jones , Mark Brown , Sascha Hauer , lgirdwood@gmail.com, Rob Herring , Linux Kernel Mailing List , rui.zhang@intel.com, devicetree , linux-arm-kernel , Sascha Hauer , linux-hwmon@vger.kernel.org, amitk@kernel.org, linux-pm@vger.kernel.org, dl-linux-imx , Shawn Guo Subject: Re: [PATCH v15 3/8] mfd: simple-mfd-i2c: Enable support for the silergy,sy7636a Message-ID: <20211124203532.30577a50@aktux> In-Reply-To: <00d68181-ad3b-17d2-0150-00029d399f0f@roeck-us.net> References: <20211110122948.188683-1-alistair@alistair23.me> <20211110122948.188683-4-alistair@alistair23.me> <20211116000634.767dcdc0@aktux> <00d68181-ad3b-17d2-0150-00029d399f0f@roeck-us.net> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On Tue, 23 Nov 2021 07:39:05 -0800 Guenter Roeck wrote: > On 11/23/21 4:14 AM, Alistair Francis wrote: > > On Tue, Nov 16, 2021 at 9:10 AM Andreas Kemnade = wrote: =20 > >> > >> Hi, > >> > >> this all creates a lot of question marks... > >> One of my main question is whether sy7636a =3D 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" =20 > >=20 > > I don't have a definite answer for you. But I think it's sy7636a > >=20 > > 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. > > =20 >=20 > Almost all chips have an ordering suffix, indicating things like > temperature range or packaging. The datasheet says: >=20 yes, they have. The only question is where it starts. So did you find a public datasheet which you can chere > Ordering Information > SY7636 =E2=96=A1(=E2=96=A1=E2=96=A1)=E2=96=A1 > | Temperature Code (C) > | Package Code (RM) > | Optional Spec Code (A) >=20 > The datasheet otherwise refers to the chip as SY7636A. >=20 so there is no indication of something like this where the A really makes a difference: commit 28e64a68a2ef1c48f30e8b6803725199929069fc Author: Daniel Jeong Date: Tue Nov 12 15:08:58 2013 -0800 backlight: lm3630: apply chip revision =20 The LM3630 chip was revised by TI and chip name was also changed to LM3630A. And register map, default values and initial sequences are changed. The files, lm3630_bl.{c,h} are replaced by lm3630a_bl.{c,h} Y= ou can find more information about LM3630A(datasheet, evm etc) at http://www.ti.com/product/lm3630a That is good to know. Thanks for your investigation.=20 Regards, Andreas