From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A274EC433E0 for ; Tue, 30 Mar 2021 19:39:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 773AB619BC for ; Tue, 30 Mar 2021 19:39:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233232AbhC3Tir (ORCPT ); Tue, 30 Mar 2021 15:38:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56272 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233227AbhC3TiN (ORCPT ); Tue, 30 Mar 2021 15:38:13 -0400 Received: from mail-oi1-x232.google.com (mail-oi1-x232.google.com [IPv6:2607:f8b0:4864:20::232]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10F9AC061574; Tue, 30 Mar 2021 12:38:13 -0700 (PDT) Received: by mail-oi1-x232.google.com with SMTP id d12so17584166oiw.12; Tue, 30 Mar 2021 12:38:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=xI3kli3hS2fPyhDQvDMlAZ1DPbV3ke0jXU3XxGK6Iv0=; b=RxSEomzzNVufOedcbWjk9wGu6u/ZW28ITrTPqkZjm5KifOBlzu8GaTsCv+jhx2CLwl FlChfR7smLmVMwMr+wEqKHZkNTWcmieN0k4M+QEKlw6CvglIU9q7wD1TS8Rgt3VSP25+ FSnTMKpxoZnEIYnDDyGyLWQ3ARtcIvtZztgQv6TAMMJ1FuC+IL5hWei1w0K27HBz8Xpw C7YTxIyHAF3d/wXikFXJ+RawHCITkwX9nquErtqIenu8EKM2vs8ibmsPMQaloICQTuAK JR2CI5DeaBI1YD2B+tWc1uqKwQcFrO3/TrkkiTjT4Kt7WvMOjpUwjtJZ2ygFrXCha29w qulw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to:user-agent; bh=xI3kli3hS2fPyhDQvDMlAZ1DPbV3ke0jXU3XxGK6Iv0=; b=DtyclUieLGpDuboRXMnSNzBwW9H9NiNMFF7eGg6LOXeqceKPYSm1Py+FPatu3G6T1W +ODi70sOSBOa/dtCJKnthiEae+gd7mfg0ypI7TkGRIJsnFNsruMB85fxNuGWI4GZXIZa PTMYFWzGW4mzrXlpbkL/Y1JF+sZFYyHLwDexLJObZt/b9qwJ33GQbI3n/ELhEs1FbNja I7oFwjOjrtbDmVvrQP8GaH+zD7BpXvd4NR4IRgaZQ0+d0x9SOU2Z9TooMa5lkMODte2f 3IoAnWceNA4WGTCUQbc43kZRKuIxBv61Pg5ZTBctmsuNhNKsrtgkYICtKnps42e1MRZ2 s/rg== X-Gm-Message-State: AOAM530VU7AvLg+wkNpCHs/n58aBxRznIjode6IXlBngGhQuhlOg1vP1 67sqSHaqb/gY1qFtf+9cyKM= X-Google-Smtp-Source: ABdhPJyAf0AtIWDRIdBNifFO42dpVXVRAIUztA0dKGsmOxAz3+0OVv43Me3QLKjxHEYgkLXKqk+F7w== X-Received: by 2002:a05:6808:3d9:: with SMTP id o25mr4540965oie.4.1617133092545; Tue, 30 Mar 2021 12:38:12 -0700 (PDT) Received: from localhost ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id v195sm4331370oia.38.2021.03.30.12.38.10 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 30 Mar 2021 12:38:11 -0700 (PDT) Sender: Guenter Roeck Date: Tue, 30 Mar 2021 12:38:10 -0700 From: Guenter Roeck To: Mark Brown Cc: Zev Weiss , Jean Delvare , linux-hwmon@vger.kernel.org, Andrew Jeffery , Liam Girdwood , linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org Subject: Re: Enabling pmbus power control Message-ID: <20210330193810.GA235990@roeck-us.net> References: <5105ada1-643a-8e58-a52d-d3c8dbef86b9@roeck-us.net> <20210330112254.GB4976@sirena.org.uk> <20210330174221.GJ4976@sirena.org.uk> <20210330180200.GK4976@sirena.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210330180200.GK4976@sirena.org.uk> User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 30, 2021 at 07:02:00PM +0100, Mark Brown wrote: > On Tue, Mar 30, 2021 at 12:56:56PM -0500, Zev Weiss wrote: > > > Okay, to expand a bit on the description in my initial message -- we've > > got a single chassis with multiple server boards and a single manager board > > that handles, among other things, power control for the servers. > > The manager board has one LM25066 for each attached server, which acts as > > the "power switch" for that server. There thus really isn't any driver to > > speak of for the downstream device. > > This sounds like you need a driver representing those server boards (or > the slots they plug into perhaps) that represents everything about those > boards to userspace, including power switching. I don't see why you > wouldn't have a driver for that - it's a thing that physically exists > and clearly has some software control, and you'd presumably also expect > to represent some labelling about the slot as well. Absolutely agree. Thanks, Guenter