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=-2.2 required=3.0 tests=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 31E21C2D0C8 for ; Sun, 22 Dec 2019 21:49:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0E2F32067C for ; Sun, 22 Dec 2019 21:49:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726557AbfLVVtA (ORCPT ); Sun, 22 Dec 2019 16:49:00 -0500 Received: from metis.ext.pengutronix.de ([85.220.165.71]:43585 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726267AbfLVVtA (ORCPT ); Sun, 22 Dec 2019 16:49:00 -0500 Received: from ptx.hi.pengutronix.de ([2001:67c:670:100:1d::c0]) by metis.ext.pengutronix.de with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1ij95p-0002Wh-9Q; Sun, 22 Dec 2019 22:48:53 +0100 Received: from ukl by ptx.hi.pengutronix.de with local (Exim 4.89) (envelope-from ) id 1ij95n-000697-Bk; Sun, 22 Dec 2019 22:48:51 +0100 Date: Sun, 22 Dec 2019 22:48:51 +0100 From: Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= To: Jeff LaBundy Cc: "mark.rutland@arm.com" , "devicetree@vger.kernel.org" , "lars@metafoo.de" , "kernel@pengutronix.de" , "linux-pwm@vger.kernel.org" , "linux-iio@vger.kernel.org" , "dmitry.torokhov@gmail.com" , "robh+dt@kernel.org" , "thierry.reding@gmail.com" , "pmeerw@pmeerw.net" , "linux-input@vger.kernel.org" , "lee.jones@linaro.org" , "jic23@kernel.org" , "knaack.h@gmx.de" Subject: Re: [PATCH v2 4/7] pwm: Add support for Azoteq IQS620A PWM generator Message-ID: <20191222214851.kapsro6b6qylke43@pengutronix.de> References: <1575851866-18919-1-git-send-email-jeff@labundy.com> <1575851866-18919-5-git-send-email-jeff@labundy.com> <20191209073206.6pftsak5v25jdepz@pengutronix.de> <20191210000252.GA6361@labundy.com> <20191210072227.434hyv5wl3rwztqx@pengutronix.de> <20191215203607.GA31390@labundy.com> <20191216091912.r4onikojbkbmguag@pengutronix.de> <20191220031924.GA2658@labundy.com> <20191220085948.iagsdpjqd6ixdo7j@pengutronix.de> <20191221032755.GA3051@labundy.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20191221032755.GA3051@labundy.com> User-Agent: NeoMutt/20170113 (1.7.2) X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::c0 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: devicetree@vger.kernel.org Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Hello Jeff, On Sat, Dec 21, 2019 at 03:28:01AM +0000, Jeff LaBundy wrote: > I heard back from the vendor today; they've acknowledged the limitation and > are considering adding support for 0% in a future ROM spin. In the meantime, > they've agreed to describe the high-impedance behavior in the data sheet as > well as include the pull-down resistor in an example schematic. Oh wow, seems like a good vendor then. :-) > > > Option (3) seems like overkill for such a simple PWM, and ultimately doesn't > > > add any value because I don't want to allow option (1) behavior in any case. > > > Whether the PWM is disabled because it is truly disabled or to simulate a 0% > > > duty cycle as in option (2), the pull-down is ultimately required regardless > > > of whether or not the data sheet happens to go into such detail. > > > > Actually I like option 3 best. > > > > Based on your other feedback, I'm moving forward under the impression that > you'll still accept option (2); please let me know if I have misunderstood > (thank you for being flexible). Yeah, that's fine. If in the end it shows that this is a bad idea we can still change to (3). Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | https://www.pengutronix.de/ |