From patchwork Sun Dec 19 13:24:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 526184 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2AD81C433FE for ; Sun, 19 Dec 2021 13:24:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235780AbhLSNYu (ORCPT ); Sun, 19 Dec 2021 08:24:50 -0500 Received: from www.zeus03.de ([194.117.254.33]:35762 "EHLO mail.zeus03.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235774AbhLSNYt (ORCPT ); Sun, 19 Dec 2021 08:24:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=sang-engineering.com; h= from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; s=k1; bh=6S9HQBL4r3odhkkECEIs/X8yzGW X/KwaJV8Lve5KOFQ=; b=uSuPoT3dsjVyTzBWayEvF5QiHhgLqR9AwWu9wF5kqRJ x/1E00VzMmJ0g364EDMKTRFOjeL4g+hRsCFYw6VtJANSAa2w7O3G5ONC6Z/4ipqw o1T4PwDBW0GOXWIUiLkT8rvtELjbwewnIvmqz3I4M/PtPuH+4JWgdRm+uokIt62I = Received: (qmail 612090 invoked from network); 19 Dec 2021 14:24:48 +0100 Received: by mail.zeus03.de with ESMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 19 Dec 2021 14:24:48 +0100 X-UD-Smtp-Session: l3s3148p1@F9s4sn/T9sUgAQnoAHzOAHbG3MPk/2E5 From: Wolfram Sang To: linux-gpio@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Andy Shevchenko , linux-kernel@vger.kernel.org, Wolfram Sang Subject: [PATCH v6 0/1] gpio: add simple logic analyzer using polling Date: Sun, 19 Dec 2021 14:24:41 +0100 Message-Id: <20211219132442.4080-1-wsa+renesas@sang-engineering.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org I'll start with the changes since v5, they are rather minimal: * added introductory paragraph to RST docs (mostly provided by Linus Walleij, thanks!) * fixed sorting order in Makefile (thanks Geert!) * improved label name and errno, white space fixes to the script (thanks Andy!) I'd really like to see this in 5.17. Given the review comments of the last two iterations, I'd think they could have been fixed incrementally as well. So, if no major issue comes up now, I hope we can merge this for next cycle. I will stil be around for incremental updates and bugfixes, of course. For completeness, here is the cover letter from the last version, it still applies. git branch name is updated, of course. === The bravery continues with the next update of the in-kernel logic analyzer based on GPIO polling with local irqs disabled. It has been tested locally and remotely. It provided satisfactory results. Besides the driver, there is also a script which isolates a CPU to achieve the best possible result. I am aware of the latency limitations. However, the intention is for debugging only, not mass production. Especially for remote debugging and to get a first impression, this has already been useful. Documentation is within the patch, to get a better idea what this is all about. A branch is here: git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/gpio-logic-analyzer-v6 And an eLinux-wiki page with a picture of a result is here: https://elinux.org/Kernel_GPIO_Logic_analyzer I've used the analyzer in a few more scenarios and on another SoC (Renesas R-Car M3-W) and was happy with the outcome. Looking forward to other tests and comments. From my side this is good to go. === Happy hacking, Wolfram Wolfram Sang (1): gpio: add sloppy logic analyzer using polling .../dev-tools/gpio-sloppy-logic-analyzer.rst | 86 +++++ Documentation/dev-tools/index.rst | 1 + drivers/gpio/Kconfig | 17 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-sloppy-logic-analyzer.c | 340 ++++++++++++++++++ tools/gpio/gpio-sloppy-logic-analyzer | 221 ++++++++++++ 6 files changed, 666 insertions(+) create mode 100644 Documentation/dev-tools/gpio-sloppy-logic-analyzer.rst create mode 100644 drivers/gpio/gpio-sloppy-logic-analyzer.c create mode 100755 tools/gpio/gpio-sloppy-logic-analyzer