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,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 5A479C432BE for ; Mon, 23 Aug 2021 14:45:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3C982613B1 for ; Mon, 23 Aug 2021 14:45:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230354AbhHWOq2 (ORCPT ); Mon, 23 Aug 2021 10:46:28 -0400 Received: from relay.uni-heidelberg.de ([129.206.100.212]:57139 "EHLO relay.uni-heidelberg.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230290AbhHWOq1 (ORCPT ); Mon, 23 Aug 2021 10:46:27 -0400 X-Greylist: delayed 428 seconds by postgrey-1.27 at vger.kernel.org; Mon, 23 Aug 2021 10:46:27 EDT X-IPAS-Result: =?us-ascii?q?A2CDAABesiNh/1BqzoFaHQEBAQEJARIBBQUBQIFHBgELA?= =?us-ascii?q?YMhVoUzkQubbYIHAQEBAQEBAQEBCTcHAQIEAQGEaoI7AiU2Bw4BAgQBAQEBA?= =?us-ascii?q?wIDAQEBAQEBAwEBBgEBAQEBBgSBJIVoDYZCAQEEASMPAUYQCxgCAiYCAhQoI?= =?us-ascii?q?S6CV4JmIQ+oZ3qBMYEBg00BhFuBKh0GgRAqAYVwU4UJgk+CKYQKMD6CS4IWg?= =?us-ascii?q?nqCZASFMgiBOVREvxkHjWyTfQQWLJVYkSCQXpF3k1mFMIFoBIIJMz6DOU8ZD?= =?us-ascii?q?5cmhUxCZwIGAQoBAQMJhT0BAYkrAQE?= IronPort-HdrOrdr: A9a23:z62F1anQsZK+CoY9KY3YfzVlSl/pDfIb3DAbv31ZSRFFG/Fwz/ re+MjzpiWE7wr5OUtQ4uxoV5PhfZqxz/NICMwqTNKftWrdyRGVxeNZnOjfKlTbckWUnNK1l5 0QEZSWY+eeMbEOt6fHCX6DferIruPqzEniv5a5854kd3ASV0hP1XYANjqm X-IronPort-Anti-Spam-Filtered: true Received: from lemon.iwr.uni-heidelberg.de ([129.206.106.80]) by relay.uni-heidelberg.de with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 23 Aug 2021 16:38:35 +0200 Received: from hlauer by lemon.iwr.uni-heidelberg.de with local (Exim 4.92) (envelope-from ) id 1mIB5u-000112-Ey; Mon, 23 Aug 2021 16:38:34 +0200 Date: Mon, 23 Aug 2021 16:38:34 +0200 From: Hermann.Lauer@uni-heidelberg.de To: Gregory CLEMENT Cc: linux-i2c@vger.kernel.org Subject: Re: Re: I2C MV64XXX: Showing Allwinner debug LCR register in bus lock case Message-ID: <20210823143834.GP8757@lemon.iwr.uni-heidelberg.de> References: <20210729073100.GA8757@lemon.iwr.uni-heidelberg.de> <87mtq3zxhx.fsf@BL-laptop> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <87mtq3zxhx.fsf@BL-laptop> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Hello Grégory, On Fri, Jul 30, 2021 at 04:28:58PM +0200, Gregory CLEMENT wrote: > > if Allwinner i2c locks, the is a LCR register (reg_base + 0x20), > > which shows directly the state of the SCL and SDA lines. So you can > > see which line (if any) is pulled externally low. > > > > Is there a similar usefull register in the original MV64XXX MARVELL > > chip? > > I've check on the Armada 38x datasheet and at least on this one there is > no such register or register with similar information. That's mean you > won't be able to use it for any device only the Allwinner ones. Thanks for looking! So, is ifdefing in the driver then the best solution to display that valueable information? Thanks for any idea, greetings Hermann > > I'd like to make the patch https://bitbucket.org/hlauer/kernel/src/master/patches/i2c-buslock.patchl working for that chip, too.