From: Pavel Machek <pavel@ucw.cz>
To: Oleksandr Shamray <oleksandrs@mellanox.com>
Cc: gregkh@linuxfoundation.org, arnd@arndb.de,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
openbmc@lists.ozlabs.org, joel@jms.id.au, jiri@resnulli.us,
tklauser@distanz.ch, linux-serial@vger.kernel.org,
vadimp@mellanox.com, system-sw-low-level@mellanox.com,
robh+dt@kernel.org, openocd-devel-owner@lists.sourceforge.net,
linux-api@vger.kernel.org, davem@davemloft.net,
mchehab@kernel.org
Subject: Re: [patch v14 4/4] Documentation: jtag: Add ABI documentation
Date: Mon, 12 Feb 2018 00:43:44 +0100 [thread overview]
Message-ID: <20180211234344.GA3864@localhost> (raw)
In-Reply-To: <1513268971-13518-5-git-send-email-oleksandrs@mellanox.com>
Hi!
> @@ -0,0 +1,27 @@
> +What: /dev/jtag[0-9]+
> +Date: October 2017
> +KernelVersion: 4.15
> +Contact: oleksandrs@mellanox.com
> +Description:
> + The misc device files /dev/jtag* are the interface
> + between JTAG master interface and userspace.
> +
> + The ioctl(2)-based ABI is defined and documented in
> + [include/uapi]<linux/jtag.h>.
> +
> + The following file operations are supported:
> +
> + open(2)
> + The argument flag currently support only one access
> + mode O_RDWR.
> +
> + ioctl(2)
> + Initiate various actions.
> + See the inline documentation in [include/uapi]<linux/jtag.h>
> + for descriptions of all ioctls.
I tried reading the jtag.h, and am still not sure how it works. Real docs
would be nice...
In particular, it seems to always specify read or write actiom. Sounds
like a job for read/write syscalls?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
prev parent reply other threads:[~2018-02-11 23:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-14 16:29 [patch v14 0/4] JTAG driver introduction Oleksandr Shamray
[not found] ` <1513268971-13518-1-git-send-email-oleksandrs-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2017-12-14 16:29 ` [patch v14 1/4] drivers: jtag: Add JTAG core driver Oleksandr Shamray
2017-12-14 18:13 ` Philippe Ombredanne
2017-12-14 16:29 ` [patch v14 2/4] drivers: jtag: Add Aspeed SoC 24xx and 25xx families JTAG master driver Oleksandr Shamray
[not found] ` <1513268971-13518-3-git-send-email-oleksandrs-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2017-12-14 18:14 ` Philippe Ombredanne
2017-12-15 1:34 ` Joel Stanley
2017-12-14 16:29 ` [patch v14 3/4] Documentation: jtag: Add bindings for " Oleksandr Shamray
2017-12-14 16:29 ` [patch v14 4/4] Documentation: jtag: Add ABI documentation Oleksandr Shamray
2018-02-11 23:43 ` Pavel Machek [this message]
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