From: Wolfram Sang <wsa+renesas@sang-engineering.com>
To: linux-gpio@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Linus Walleij <linus.walleij@linaro.org>,
linux-kernel@vger.kernel.org,
Wolfram Sang <wsa+renesas@sang-engineering.com>
Subject: [PATCH v2 0/1] gpio: add simple logic analyzer using polling
Date: Sat, 18 Sep 2021 10:33:06 +0200 [thread overview]
Message-ID: <20210918083307.3195-1-wsa+renesas@sang-engineering.com> (raw)
The bravery continues with the next update of the in-kernel logic
analyzer based on GPIO polling with local irqs disabled. It has been
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.
Changes since v1:
* addressed Andy's review comments (thanks!)
* mutex gets destroyed on remove
* make use of the snprintf return value
* improved errno
* script: use only progname instead of $0
* script: refactor 'shift' usage in command line handling
* spelling fixes
* script: fixed a bug when using '--instance'
* short success message after proper initialization
I had a look at Andy's other suggestion, too, but decided against them.
Either I liked the current style better or they can be added later when
we actually need them.
I've used the analyzer in a few more scenarios and was happy with the
outcome. Looking forward to other tests and comments. From my side this
looks good to go.
Happy hacking,
Wolfram
Wolfram Sang (1):
gpio: add sloppy logic analyzer using polling
.../dev-tools/gpio-sloppy-logic-analyzer.rst | 71 ++++
Documentation/dev-tools/index.rst | 1 +
drivers/gpio/Kconfig | 17 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-sloppy-logic-analyzer.c | 341 ++++++++++++++++++
tools/gpio/gpio-sloppy-logic-analyzer | 221 ++++++++++++
6 files changed, 652 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
--
2.30.2
next reply other threads:[~2021-09-18 8:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-18 8:33 Wolfram Sang [this message]
2021-09-18 8:33 ` [PATCH v2 1/1] gpio: add sloppy logic analyzer using polling Wolfram Sang
2021-09-19 20:27 ` Andy Shevchenko
2021-09-20 8:30 ` Wolfram Sang
2021-09-20 8:45 ` Andy Shevchenko
2021-11-22 12:19 ` Wolfram Sang
2021-11-22 12:33 ` Andy Shevchenko
2021-11-22 15:03 ` Wolfram Sang
2021-09-20 12:15 ` Geert Uytterhoeven
2021-11-22 11:43 ` Wolfram Sang
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