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 DF5CEC4332F for ; Wed, 24 Nov 2021 20:09:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244568AbhKXUNA (ORCPT ); Wed, 24 Nov 2021 15:13:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42150 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236059AbhKXUM7 (ORCPT ); Wed, 24 Nov 2021 15:12:59 -0500 Received: from mail-ot1-x32c.google.com (mail-ot1-x32c.google.com [IPv6:2607:f8b0:4864:20::32c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 74287C061574; Wed, 24 Nov 2021 12:09:49 -0800 (PST) Received: by mail-ot1-x32c.google.com with SMTP id u18-20020a9d7212000000b00560cb1dc10bso6020712otj.11; Wed, 24 Nov 2021 12:09:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=sender:to:cc:references:from:subject:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=4xNXRuhIBU453ImJBo0Cx8qkVWsTpMmqNZWaGTk7aa0=; b=kgOrqZKZgqiyvjxRBPyF3KQVhyjLrkcvHA6lsKos93OSoL/gH0rHHdB36neF6LrIkc U3XTS1w/zHtTnOAUccH+XHxd9rzCwBbegk36ntd1ZSplBst50yxNkMU2DRQ/eJ/URZb0 NSK8PrOtoXFq/PmL3+9zbRstg6QOOvxVerI9gVg5E3BWIyEzH2UipeSn73VhO2gNKlVF AEzEGVO7jqTqK04bmKw4Do/xXkYM+Uz01Yzy2Nj+fpQ5oJGIlr1dojsx4dfVi8XMj4dd 80SnUJWlu9i3sHJg1EKZtxbtjtO247aaae0OA5Fb1xbj4KEQmCEF4KY/qsId2yiocFqQ 7Y7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:sender:to:cc:references:from:subject:message-id :date:user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=4xNXRuhIBU453ImJBo0Cx8qkVWsTpMmqNZWaGTk7aa0=; b=shUUtNmQaesFHXk19u7jnNvf7OJl7DrHAqqmGhakpt90Jbut6OymV5XuXHJpuwx+u3 MNmP2v0io7lODnIqK7ZoBJcisaANtlQx4uSi+DdW7iPTj9eeu8rM7qZaByWSux1dijkz 6dy1FqajQQKGn44ye5L2u+IAAe50Ebzw7ucSQhirfNtRSe6s6UzQ0LxiJuWgc80ui40v fbKMZsB7JmI2l/3/BPICRzJheb9NYUGcXfyBhLdkwH640xaEr7kaKAHdRDSWE5nAOqEt R8OlaQj+MV8dLUbzu/a9PlyO0OmY4RNlpn2T/INc4qf6AmUuqybcQwMgi/o/RTb69W1W hMGA== X-Gm-Message-State: AOAM532gm6IM977UtWHrI4Vu7KbsEmjDzo7UKIKDUR1OoeVRLFHUobA0 5jzLuim/Jnm2O9EKvtyiMjg= X-Google-Smtp-Source: ABdhPJyr2zIQORx6RQRObn7/Ddhw3CCbycyekrE8s5E/apgzlTJeH0lPBWhbpP4U1xZ67thg7BrVlg== X-Received: by 2002:a05:6830:1049:: with SMTP id b9mr16091463otp.60.1637784588808; Wed, 24 Nov 2021 12:09:48 -0800 (PST) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id c8sm135240otk.40.2021.11.24.12.09.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 24 Nov 2021 12:09:47 -0800 (PST) Sender: Guenter Roeck To: Andreas Kemnade 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 References: <20211110122948.188683-1-alistair@alistair23.me> <20211110122948.188683-4-alistair@alistair23.me> <20211116000634.767dcdc0@aktux> <00d68181-ad3b-17d2-0150-00029d399f0f@roeck-us.net> <20211124203532.30577a50@aktux> From: Guenter Roeck Subject: Re: [PATCH v15 3/8] mfd: simple-mfd-i2c: Enable support for the silergy,sy7636a Message-ID: Date: Wed, 24 Nov 2021 12:09:44 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <20211124203532.30577a50@aktux> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/24/21 11:35 AM, Andreas Kemnade wrote: > 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: >>>> >>>> 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. >> 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. Guenter