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Message-Id: <20181022133404.2061-4-boris.brezillon@bootlin.com>
Date: Mon, 22 Oct 2018 15:33:58 +0200
From: Boris Brezillon <boris.brezillon@...tlin.com>
To: Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Arnd Bergmann <arnd@...db.de>
Cc: Przemyslaw Sroka <psroka@...ence.com>,
Arkadiusz Golec <agolec@...ence.com>,
Alan Douglas <adouglas@...ence.com>,
Bartosz Folta <bfolta@...ence.com>,
Damian Kos <dkos@...ence.com>,
Alicja Jurasik-Urbaniak <alicja@...ence.com>,
Cyprian Wronka <cwronka@...ence.com>,
Suresh Punnoose <sureshp@...ence.com>,
Rafal Ciepiela <rafalc@...ence.com>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Vitor Soares <Vitor.Soares@...opsys.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Linus Walleij <linus.walleij@...aro.org>,
Xiang Lin <Xiang.Lin@...aptics.com>,
linux-gpio@...r.kernel.org, Sekhar Nori <nsekhar@...com>,
Przemyslaw Gaj <pgaj@...ence.com>,
Peter Rosin <peda@...ntia.se>,
Mike Shettel <mshettel@...eaurora.org>,
Stephen Boyd <swboyd@...omium.org>,
Joe Perches <joe@...ches.com>,
Boris Brezillon <boris.brezillon@...tlin.com>
Subject: [PATCH v9 3/9] i3c: Add sysfs ABI spec
Document sysfs files/directories/symlinks exposed by the I3C subsystem.
Signed-off-by: Boris Brezillon <boris.brezillon@...tlin.com>
Reviewed-by: Arnd Bergmann <arnd@...db.de>
---
Changes in v9:
- Add Arnd's R-b
Changes in v8:
- None
Changes in v7:
- Bump KernelVersion to 4.20
- Add new entries under i3c-<bus-id> now that the master controller is
no longer represented as a device under this directory but implicitly
represented by the bus object
Changes in v6:
- none
Changes in v5:
- Fix the kernel version
- Rename address into dynamic_address to match changes done in the code
Changes in v4:
- none
Changes in v3:
- none
Changes in v2:
- new patch
---
Documentation/ABI/testing/sysfs-bus-i3c | 146 ++++++++++++++++++++++++
1 file changed, 146 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..d7c7485b0c17
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-i3c
@@ -0,0 +1,146 @@
+What: /sys/bus/i3c/devices/i3c-<bus-id>
+KernelVersion: 4.20
+Contact: linux-i3c@...r.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: 4.20
+Contact: linux-i3c@...r.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: 4.20
+Contact: linux-i3c@...r.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: 4.20
+Contact: linux-i3c@...r.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: 4.20
+Contact: linux-i3c@...r.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>/dynamic_address
+KernelVersion: 4.20
+Contact: linux-i3c@...r.kernel.org
+Description:
+ Dynamic address assigned to the master controller. This
+ address may change if the bus is re-initialized.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/bcr
+KernelVersion: 4.20
+Contact: linux-i3c@...r.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.
+ This entry describes the BCR of the master controller driving
+ the bus.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/dcr
+KernelVersion: 4.20
+Contact: linux-i3c@...r.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.
+ This entry describes the DCR of the master controller driving
+ the bus.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/pid
+KernelVersion: 4.20
+Contact: linux-i3c@...r.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.
+ This entry describes the PID of the master controller driving
+ the bus.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/hdrcap
+KernelVersion: 4.20
+Contact: linux-i3c@...r.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.
+ This entry describes the HDRCAP of the master controller
+ driving the bus.
+
+What: /sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>
+KernelVersion: 4.20
+Contact: linux-i3c@...r.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>/dynamic_address
+KernelVersion: 4.20
+Contact: linux-i3c@...r.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: 4.20
+Contact: linux-i3c@...r.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: 4.20
+Contact: linux-i3c@...r.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: 4.20
+Contact: linux-i3c@...r.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: 4.20
+Contact: linux-i3c@...r.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: 4.20
+Contact: linux-i3c@...r.kernel.org
+Description:
+ These directories are just symbolic links to
+ /sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>.
--
2.17.1
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