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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 8BBEEC433DB for ; Wed, 27 Jan 2021 07:16:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5382A2072C for ; Wed, 27 Jan 2021 07:16:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233581AbhA0HQu (ORCPT ); Wed, 27 Jan 2021 02:16:50 -0500 Received: from metis.ext.pengutronix.de ([85.220.165.71]:58825 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233015AbhA0HNY (ORCPT ); Wed, 27 Jan 2021 02:13:24 -0500 X-Greylist: delayed 63181 seconds by postgrey-1.27 at vger.kernel.org; Wed, 27 Jan 2021 02:13:24 EST Received: from gallifrey.ext.pengutronix.de ([2001:67c:670:201:5054:ff:fe8d:eefb] helo=bjornoya.blackshift.org) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1l4ey5-00077a-74; Wed, 27 Jan 2021 08:10:21 +0100 Received: from [IPv6:2a03:f580:87bc:d400:e43:d55:1994:1705] (unknown [IPv6:2a03:f580:87bc:d400:e43:d55:1994:1705]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mkl@blackshift.org", Issuer "StartCom Class 1 Client CA" (not verified)) (Authenticated sender: mkl@blackshift.org) by smtp.blackshift.org (Postfix) with ESMTPSA id A05A75CEEC7; Wed, 27 Jan 2021 07:10:19 +0000 (UTC) Subject: Re: [PATCH v4 0/2] add support for GPIO based counter To: Oleksij Rempel Cc: devicetree@vger.kernel.org, linux-iio@vger.kernel.org, Robin van der Gracht , William Breathitt Gray , linux-kernel@vger.kernel.org, Rob Herring , Pengutronix Kernel Team , David Jander References: <20210126131239.8335-1-o.rempel@pengutronix.de> <84d94006-44d3-70ac-2054-2419b0555a87@pengutronix.de> <20210127064457.qyal6jli5qj52ovx@pengutronix.de> From: Marc Kleine-Budde Autocrypt: addr=mkl@pengutronix.de; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <20210127064457.qyal6jli5qj52ovx@pengutronix.de> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="JpHSNfSdfCdeox7GkTPvkTLxwRd5fvWy7" X-SA-Exim-Connect-IP: 2001:67c:670:201:5054:ff:fe8d:eefb X-SA-Exim-Mail-From: mkl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --JpHSNfSdfCdeox7GkTPvkTLxwRd5fvWy7 Content-Type: multipart/mixed; boundary="AWr8JhZuFlVIUxd4tbxkhvfdW8hOLgobB"; protected-headers="v1" From: Marc Kleine-Budde To: Oleksij Rempel Cc: devicetree@vger.kernel.org, linux-iio@vger.kernel.org, Robin van der Gracht , William Breathitt Gray , linux-kernel@vger.kernel.org, Rob Herring , Pengutronix Kernel Team , David Jander Message-ID: <6a68010b-9c92-dc30-8bcc-9fc5c5068603@pengutronix.de> Subject: Re: [PATCH v4 0/2] add support for GPIO based counter References: <20210126131239.8335-1-o.rempel@pengutronix.de> <84d94006-44d3-70ac-2054-2419b0555a87@pengutronix.de> <20210127064457.qyal6jli5qj52ovx@pengutronix.de> In-Reply-To: <20210127064457.qyal6jli5qj52ovx@pengutronix.de> --AWr8JhZuFlVIUxd4tbxkhvfdW8hOLgobB Content-Type: text/plain; charset=utf-8 Content-Language: de-DE Content-Transfer-Encoding: quoted-printable On 1/27/21 7:44 AM, Oleksij Rempel wrote: >>> changes v3: >>> - convert counter to atomic_t >> >> What's the guaranteed width of atomic_t? IIRC a long time ago it was 2= 4 bit only.... >=20 > 32 bits. The counter is wrapped after 4294967295 Note: This is only true for >=3D v2.6.3 :D https://lwn.net/Articles/71732/ Feeling old, Marc --=20 Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung West/Dortmund | Phone: +49-231-2826-924 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | --AWr8JhZuFlVIUxd4tbxkhvfdW8hOLgobB-- --JpHSNfSdfCdeox7GkTPvkTLxwRd5fvWy7 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEK3kIWJt9yTYMP3ehqclaivrt76kFAmAREdgACgkQqclaivrt 76kTfggAncfSz+92ggnF8HDjtOshXcG/E9QxwQbutKeskhraFlK1D3zviKK90sIu x01qVUbME2+o7fWw0sY2AiRGHZRlt4dYiQFD/Io5EBNklVxG3mcO7lOdflXVTRi4 36kMbueuO/Q0apMJeGRJUxzxbO69fUEfAqWiZVAOUZcGUwGMXbzJ5foYZYJL0CYi AHH6eb7J4mhyH5b1odQFp6r345kc5PGwGaa6elqVT0fdzaK3st0yS+j9UQI7VfwQ oCK3rZVJ9Wqhg+nEBc2aEC9zSxRM+yIy5zQwYCGnQlOZSo/8OBwuT3U1FPKnDimB gnwFst4eX9UaBV5laSsREQHqPzwZ2A== =nadb -----END PGP SIGNATURE----- --JpHSNfSdfCdeox7GkTPvkTLxwRd5fvWy7--