From: Boris Brezillon <boris.brezillon@free-electrons.com>
To: Wolfram Sang <wsa@the-dreams.de>,
linux-i2c@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
linux-doc@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Arnd Bergmann <arnd@arndb.de>
Cc: Przemyslaw Sroka <psroka@cadence.com>,
Arkadiusz Golec <agolec@cadence.com>,
Alan Douglas <adouglas@cadence.com>,
Bartosz Folta <bfolta@cadence.com>, Damian Kos <dkos@cadence.com>,
Alicja Jurasik-Urbaniak <alicja@cadence.com>,
Cyprian Wronka <cwronka@cadence.com>,
Suresh Punnoose <sureshp@cadence.com>,
Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
Nishanth Menon <nm@ti.com>, Rob Herring <robh+dt@kernel.org>,
Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Vitor Soares <Vitor.Soares@synopsys.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Linus Walleij <linus.walleij@linaro.org>,
Boris Brezillon <boris.brezillon@free-electrons.com>
Subject: [PATCH v2 4/7] i3c: Add sysfs ABI spec
Date: Thu, 14 Dec 2017 16:16:07 +0100 [thread overview]
Message-ID: <20171214151610.19153-5-boris.brezillon@free-electrons.com> (raw)
In-Reply-To: <20171214151610.19153-1-boris.brezillon@free-electrons.com>
Document sysfs files/directories/symlinks exposed by the I3C subsystem.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
Changes in v2:
- new patch
---
Documentation/ABI/testing/sysfs-bus-i3c | 95 +++++++++++++++++++++++++++++++++
1 file changed, 95 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-i3c
diff --git a/Documentation/ABI/testing/sysfs-bus-i3c b/Documentation/ABI/testing/sysfs-bus-i3c
new file mode 100644
index 000000000000..5e88cc093e0e
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-i3c
@@ -0,0 +1,95 @@
+What: /sys/bus/i3c/devices/i3c-<bus-id>
+KernelVersion: 4.16
+Contact: linux-i3c@vger.kernel.org
+Description:
+ An I3C bus. This directory will contain one sub-directory per
+ I3C device present on the bus.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/current_master
+KernelVersion: 4.16
+Contact: linux-i3c@vger.kernel.org
+Description:
+ Expose the master that owns the bus (<bus-id>-<master-pid>) at
+ the time this file is read. Note that bus ownership can change
+ overtime, so there's no guarantee that when the read() call
+ returns, the value returned is still valid.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/mode
+KernelVersion: 4.16
+Contact: linux-i3c@vger.kernel.org
+Description:
+ I3C bus mode. Can be "pure", "mixed-fast" or "mixed-slow". See
+ the I3C specification for a detailed description of what each
+ of these modes implies.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/i3c_scl_frequency
+KernelVersion: 4.16
+Contact: linux-i3c@vger.kernel.org
+Description:
+ The frequency (expressed in Hz) of the SCL signal when
+ operating in I3C SDR mode.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/i2c_scl_frequency
+KernelVersion: 4.16
+Contact: linux-i3c@vger.kernel.org
+Description:
+ The frequency (expressed in Hz) of the SCL signal when
+ operating in I2C mode.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>
+KernelVersion: 4.16
+Contact: linux-i3c@vger.kernel.org
+Description:
+ An I3C device present on I3C bus identified by <bus-id>. Note
+ that all devices are represented including the master driving
+ the bus.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>/address
+KernelVersion: 4.16
+Contact: linux-i3c@vger.kernel.org
+Description:
+ Dynamic address assigned to device <bus-id>-<device-pid>. This
+ address may change if the bus is re-initialized.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>/bcr
+KernelVersion: 4.16
+Contact: linux-i3c@vger.kernel.org
+Description:
+ BCR stands for Bus Characteristics Register and express the
+ device capabilities in term of speed, maximum read/write
+ length, etc. See the I3C specification for more details.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>/dcr
+KernelVersion: 4.16
+Contact: linux-i3c@vger.kernel.org
+Description:
+ DCR stands for Device Characteristics Register and express the
+ device capabilities in term of exposed features. See the I3C
+ specification for more details.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>/pid
+KernelVersion: 4.16
+Contact: linux-i3c@vger.kernel.org
+Description:
+ PID stands for Provisional ID and is used to uniquely identify
+ a device on a bus. This PID contains information about the
+ vendor, the part and an instance ID so that several devices of
+ the same type can be connected on the same bus.
+ See the I3C specification for more details.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>/hdrcap
+KernelVersion: 4.16
+Contact: linux-i3c@vger.kernel.org
+Description:
+ Expose the HDR (High Data Rate) capabilities of a device.
+ Returns a list of supported HDR mode, each element is separated
+ by space. Modes can be "hdr-ddr", "hdr-tsp" and "hdr-tsl".
+ See the I3C specification for more details about these HDR
+ modes.
+
+What: /sys/bus/i3c/devices/<bus-id>-<device-pid>
+KernelVersion: 4.16
+Contact: linux-i3c@vger.kernel.org
+Description:
+ These directories are just symbolic links to
+ /sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>.
--
2.11.0
next prev parent reply other threads:[~2017-12-14 15:19 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-14 15:16 [PATCH v2 0/7] Add the I3C subsystem Boris Brezillon
2017-12-14 15:16 ` [PATCH v2 1/7] i2c: Export of_i2c_get_board_info() Boris Brezillon
2017-12-14 15:16 ` [PATCH v2 2/7] i3c: Add core I3C infrastructure Boris Brezillon
2017-12-17 22:32 ` Randy Dunlap
2017-12-18 8:37 ` Boris Brezillon
2017-12-18 18:22 ` Randy Dunlap
2017-12-19 8:52 ` Greg Kroah-Hartman
2017-12-19 9:09 ` Boris Brezillon
2017-12-19 9:13 ` Boris Brezillon
2017-12-19 9:21 ` Greg Kroah-Hartman
2017-12-19 9:28 ` Boris Brezillon
2017-12-19 9:36 ` Greg Kroah-Hartman
2018-02-21 14:22 ` Boris Brezillon
2018-02-21 14:38 ` Greg Kroah-Hartman
2018-02-23 16:28 ` Vitor Soares
2018-02-23 16:56 ` Vitor Soares
2018-02-23 20:30 ` Boris Brezillon
2018-02-26 18:58 ` Vitor Soares
2018-02-26 20:36 ` Boris Brezillon
2018-02-26 20:40 ` Boris Brezillon
2018-02-26 21:38 ` Boris Brezillon
2018-02-27 16:03 ` Vitor Soares
2018-02-27 16:43 ` Przemyslaw Sroka
2018-02-27 17:06 ` Przemyslaw Sroka
2018-02-27 20:25 ` Boris Brezillon
2018-02-27 20:13 ` Boris Brezillon
2018-02-27 20:24 ` Przemyslaw Sroka
2018-02-27 21:14 ` Boris Brezillon
2018-02-27 19:57 ` Boris Brezillon
2018-02-23 22:45 ` Boris Brezillon
2017-12-14 15:16 ` [PATCH v2 3/7] docs: driver-api: Add I3C documentation Boris Brezillon
2017-12-14 15:16 ` Boris Brezillon [this message]
2017-12-14 15:16 ` [PATCH v2 5/7] dt-bindings: i3c: Document core bindings Boris Brezillon
2017-12-14 16:24 ` Geert Uytterhoeven
2017-12-14 21:47 ` Peter Rosin
2017-12-16 17:20 ` Rob Herring
2017-12-16 18:35 ` Boris Brezillon
2017-12-20 18:06 ` Rob Herring
2017-12-21 10:41 ` Boris Brezillon
2017-12-26 18:29 ` Rob Herring
2018-01-07 14:14 ` Boris Brezillon
2018-01-22 8:47 ` Boris Brezillon
2017-12-14 15:16 ` [PATCH v2 6/7] i3c: master: Add driver for Cadence IP Boris Brezillon
2017-12-14 19:54 ` Randy Dunlap
2017-12-14 20:17 ` Boris Brezillon
2017-12-14 20:25 ` Randy Dunlap
2017-12-14 20:44 ` Boris Brezillon
2017-12-14 22:10 ` Randy Dunlap
2017-12-14 15:16 ` [PATCH v2 7/7] dt-bindings: i3c: Document Cadence I3C master bindings Boris Brezillon
2018-02-22 15:00 ` [PATCH v2 0/7] Add the I3C subsystem Vitor Soares
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