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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 D1D85C433B4 for ; Wed, 7 Apr 2021 18:19:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 96BA561104 for ; Wed, 7 Apr 2021 18:19:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355168AbhDGSUC (ORCPT ); Wed, 7 Apr 2021 14:20:02 -0400 Received: from sauhun.de ([88.99.104.3]:37598 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344500AbhDGST6 (ORCPT ); Wed, 7 Apr 2021 14:19:58 -0400 Received: from localhost (p5486cf96.dip0.t-ipconnect.de [84.134.207.150]) by pokefinder.org (Postfix) with ESMTPSA id A2B1F2C04E4; Wed, 7 Apr 2021 20:19:45 +0200 (CEST) Date: Wed, 7 Apr 2021 20:19:36 +0200 From: Wolfram Sang To: Qii Wang Cc: matthias.bgg@gmail.com, linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com, leilk.liu@mediatek.com Subject: Re: [RESEND] i2c: mediatek: Get device clock-stretch time via dts Message-ID: <20210407181936.GA1614@kunai> Mail-Followup-To: Wolfram Sang , Qii Wang , matthias.bgg@gmail.com, linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com, leilk.liu@mediatek.com References: <1615622664-15032-1-git-send-email-qii.wang@mediatek.com> <20210406194856.GF3122@kunai> <1617797706.32076.1.camel@mhfsdcap03> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="RnlQjJ0d97Da+TV1" Content-Disposition: inline In-Reply-To: <1617797706.32076.1.camel@mhfsdcap03> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --RnlQjJ0d97Da+TV1 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable > Due to clock stretch, our HW IP cannot meet the ac-timing > spec(tSU;STA,tSU;STO).=20 > There isn't a same delay for clock stretching, so we need pass a > parameter which can be found through measurement to meet most > conditions. What about using this existing binding? - i2c-scl-internal-delay-ns Number of nanoseconds the IP core additionally needs to setup SCL. --RnlQjJ0d97Da+TV1 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmBt97QACgkQFA3kzBSg KbZGCxAAjTn07oN3fOfLU6hpW7yIEBiz+GxSzByvRRuqIrVft8GqetCvK5oMvd7p diD/VhZ+4P1kw4/mA6zzsRpNJNerUBPeQ7xsF7cFMU7cfvG6A0zUuOieWM7+zwvw zCllS2a+a9Pld3QZQKhQKySazasct2LvhDh2HOpiNwm+mtmpWFur1c2Wra+JovF1 soq+CYPCOB/5OkZvEGhpsXIvoCJp1/hlx3hEuAGPh34ZkOOWoZBXty6yJJsTOH+m r25H0sceNddaabw05fs+F90zs5Y6wgyCvaIp1mT/R51HKOHzR7dVLq+JZhy+AZKN uQeGtveLnr8BcS3gud44R3AhBpejil8h0DNYd2BMGp7bqOujiWbK/GkRTfT/gnZA w+omah9S/tGhZKT9RY/6lFjeI1mn+r1A3vmHfjT5WiONjMLcHLe9+5SvK/N4vfxw cqEahaLoa8TkOOD7MI5gZROtwe4BDWtFdmyujWbql9a0lO/QGzGuchKgfBCDHGZD WF35ChYRvunAJr3dyfbaThKS7/KpolBLQz+z4Hs2x7PkRmvyK18AIJkdv/d7c82O scccsm6zgp1151zd9CfFKm355CmCgfUDU/naFCEic8HsmWAjc/gxjkNYpQyUjNPP +BjFP14MBlLhaAC2vGVJTqKQnStBlWAfbUr8vaV6yL/0hBnamxQ= =zMkw -----END PGP SIGNATURE----- --RnlQjJ0d97Da+TV1--