From owner-svn-src-all@freebsd.org Thu May 24 09:59:09 2018 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 9213EEAA4F6; Thu, 24 May 2018 09:59:09 +0000 (UTC) (envelope-from etnapierala@gmail.com) Received: from mail-ua0-x242.google.com (mail-ua0-x242.google.com [IPv6:2607:f8b0:400c:c08::242]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 219E080D3B; Thu, 24 May 2018 09:59:09 +0000 (UTC) (envelope-from etnapierala@gmail.com) Received: by mail-ua0-x242.google.com with SMTP id a3-v6so678424uad.8; Thu, 24 May 2018 02:59:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=NvjjwVO4oGl2MkDCEAYtUd2LptxPopiFEgqkDVOmKEs=; b=fpj/yQMtTxjRrpMaSe8HCKQONo2kWwpFfjC7pBQAbo1luVr+3mojcZJND9LLYULq71 c9LFc7JvrxQvvGZfOuULIsEUrXZEUhXJPcm/jm5Uf6j/jAC7KV45w629Ge6ppIfWy9J9 AotTg9GBDrnOykhTn8Mtkbi0Ca9xW/nSo5i7dhlhSzMFPkpIaoGwYNwSJAxOzkuywzy/ qU0D4emeXV5KfjXkWGBjMFN2E/gMryJJZKfCE1EWFYdz3aI742UP16NVxrnHqBaggQpC ldnuOhszRzBPj57TtT/dM9HcHg2O5/+FrfluImy5fwQluDfwzPTGDxZDLtwvFmPV5IxP tqhQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=NvjjwVO4oGl2MkDCEAYtUd2LptxPopiFEgqkDVOmKEs=; b=lC83iBza79ABx1j68oPzRTjqwnG2xQBwvNi4dpDQixM0+DneYkUBUvKsRefb1niOsf 55g4p0+R4HGCNWUM9zSp0L81dNKrICqr8ORqrou1EgO9ftTMEXEJU3uqnNJ6MK99LOhr 1ZRlIO8vyHfV6ErNvwbSaoHsi8EkvOyuYfvOHVg0YpYycWeDp2DX75RN9DzlYHwObesL kM7L1IU/wIsvxA6rQFuFpCGco5z+AdiPUXRRmvETUj2mqJl1LtN3JO/xztLaUojS3/tC X/1GGrA8XFFodLuENCBf3yOg8r0cD7pb8hKz1I+Z/N3Fm8BITWs90Ddd17n2/urYrcip fm/w== X-Gm-Message-State: ALKqPwdwg8+DofSF7O56wFfqO1tNiylY4VBqQ0BPD2cq65N/h7uuFwMt 3NIMSNKXBc7eS28oJZ7Rg5mZdmHdsNupDVg1hOA= X-Google-Smtp-Source: AB8JxZocpiIv3gZmGoR4JnHfU22j5LzMGYhKOeiAkKKff7PDJ+sbt/6icqVh7Umor+pQhMrY1uKK9ZPhb2wUjg62oF8= X-Received: by 2002:ab0:5d1b:: with SMTP id u27-v6mr4395416uaf.59.1527155948696; Thu, 24 May 2018 02:59:08 -0700 (PDT) MIME-Version: 1.0 Sender: etnapierala@gmail.com Received: by 2002:ab0:5a81:0:0:0:0:0 with HTTP; Thu, 24 May 2018 02:59:08 -0700 (PDT) In-Reply-To: References: <201805232006.w4NK64jS044384@repo.freebsd.org> <9B0033E1-56EC-4CA0-BC28-056871B32B0A@panasas.com> From: Edward Napierala Date: Thu, 24 May 2018 10:59:08 +0100 X-Google-Sender-Auth: IRi5D3NUYgi4RQtFK4uxC4VgIrQ Message-ID: Subject: Re: svn commit: r334115 - in head: share/man/man4 sys/dev/usb/template To: "H. Schmalzbauer - OmniLAN" Cc: Ravi Pokala , src-committers , svn-src-all@freebsd.org, svn-src-head@freebsd.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.26 X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 May 2018 09:59:09 -0000 2018-05-24 8:41 GMT+01:00 H. Schmalzbauer - OmniLAN < h.schmalzbauer@omnilan.de>: > Am 23.05.2018 um 22:35 schrieb Ravi Pokala: > >> Hi Traz, >> >> You're referring to power consumption in terms of (milli)Amps. That's no= t >> right; power is measured in Watts. What you're actually talking about is >> *current*. And it looks like in some situations USB devices can draw mor= e >> than 500mA. >> > > Since the voltage isn't a variable when talking about USB power, speaking > of "power" while refering to current seems valid to me =E2=80=93 it's 5 V= only and > those who read that don't even need to do any math in head. > I never read 2500mW in USB world, 500mA is common. > Just my 2=C2=A2 > I've just did some googling, and it seems you're right - while from physics point of view mA is definitely current and not power, pretty much everywhere I look the USB power (reported in bMaxPower) is specified in mA, not mW. Thus, I'm leaning toward leaving it as it is - wrong from a physics point of view, but aligned with the the USB naming convention.