diff options
| -rw-r--r-- | Documentation/i2c/i2c_bus.svg | 15 | ||||
| -rw-r--r-- | Documentation/i2c/summary.rst | 23 |
2 files changed, 25 insertions, 13 deletions
diff --git a/Documentation/i2c/i2c_bus.svg b/Documentation/i2c/i2c_bus.svg index 3170de976373..45801de4af7d 100644 --- a/Documentation/i2c/i2c_bus.svg +++ b/Documentation/i2c/i2c_bus.svg @@ -1,5 +1,6 @@ <?xml version="1.0" encoding="UTF-8" standalone="no"?> <!-- Created with Inkscape (http://www.inkscape.org/) --> +<!-- Updated to inclusive terminology by Wolfram Sang --> <svg xmlns:dc="http://purl.org/dc/elements/1.1/" @@ -1120,7 +1121,7 @@ <rect style="opacity:1;fill:#ffb9b9;fill-opacity:1;stroke:#f00000;stroke-width:2.8125;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" id="rect4424-3-2-9-7" - width="112.5" + width="134.5" height="113.75008" x="112.5" y="471.11221" @@ -1133,15 +1134,15 @@ y="521.46259" id="text4349"><tspan sodipodi:role="line" - x="167.5354" + x="178.5354" y="521.46259" style="font-size:25px;line-height:1.25;font-family:sans-serif;text-align:center;text-anchor:middle" id="tspan1273">I2C</tspan><tspan sodipodi:role="line" - x="167.5354" + x="178.5354" y="552.71259" style="font-size:25px;line-height:1.25;font-family:sans-serif;text-align:center;text-anchor:middle" - id="tspan1285">Master</tspan></text> + id="tspan1285">Controller</tspan></text> <rect style="color:#000000;clip-rule:nonzero;display:inline;overflow:visible;visibility:visible;opacity:1;isolation:auto;mix-blend-mode:normal;color-interpolation:sRGB;color-interpolation-filters:linearRGB;solid-color:#000000;solid-opacity:1;fill:#b9ffb9;fill-opacity:1;fill-rule:nonzero;stroke:#006400;stroke-width:2.8125;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;color-rendering:auto;image-rendering:auto;shape-rendering:auto;text-rendering:auto;enable-background:accumulate" id="rect4424-3-2-9-7-3-3-5-3" @@ -1171,7 +1172,7 @@ x="318.59131" y="552.08752" style="font-size:25.00000191px;line-height:1.25;font-family:sans-serif;text-align:center;text-anchor:middle;stroke-width:1px" - id="tspan1287">Slave</tspan></text> + id="tspan1287">Target</tspan></text> <path style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1.99968767;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" d="m 112.49995,677.36223 c 712.50005,0 712.50005,0 712.50005,0" @@ -1233,7 +1234,7 @@ x="468.59131" y="552.08746" style="font-size:25.00000191px;line-height:1.25;font-family:sans-serif;text-align:center;text-anchor:middle;stroke-width:1px" - id="tspan1287-6">Slave</tspan></text> + id="tspan1287-6">Target</tspan></text> <rect style="color:#000000;clip-rule:nonzero;display:inline;overflow:visible;visibility:visible;opacity:1;isolation:auto;mix-blend-mode:normal;color-interpolation:sRGB;color-interpolation-filters:linearRGB;solid-color:#000000;solid-opacity:1;vector-effect:none;fill:#b9ffb9;fill-opacity:1;fill-rule:nonzero;stroke:#006400;stroke-width:2.8125;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;color-rendering:auto;image-rendering:auto;shape-rendering:auto;text-rendering:auto;enable-background:accumulate" id="rect4424-3-2-9-7-3-3-5-3-1" @@ -1258,7 +1259,7 @@ x="618.59131" y="552.08746" style="font-size:25.00000191px;line-height:1.25;font-family:sans-serif;text-align:center;text-anchor:middle;stroke-width:1px" - id="tspan1287-9">Slave</tspan></text> + id="tspan1287-9">Target</tspan></text> <path style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1.99968743;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-end:url(#DotM)" d="m 150,583.61221 v 93.75" diff --git a/Documentation/i2c/summary.rst b/Documentation/i2c/summary.rst index a1e5c0715f8b..a6da1032fa06 100644 --- a/Documentation/i2c/summary.rst +++ b/Documentation/i2c/summary.rst @@ -31,15 +31,16 @@ implement all the common SMBus protocol semantics or messages. Terminology =========== -Using the terminology from the official documentation, the I2C bus connects -one or more *master* chips and one or more *slave* chips. +The I2C bus connects one or more *controller* chips and one or more *target* +chips. + .. kernel-figure:: i2c_bus.svg - :alt: Simple I2C bus with one master and 3 slaves + :alt: Simple I2C bus with one controller and 3 targets Simple I2C bus -A **master** chip is a node that starts communications with slaves. In the +A **controller** chip is a node that starts communications with targets. In the Linux kernel implementation it is called an **adapter** or bus. Adapter drivers are in the ``drivers/i2c/busses/`` subdirectory. @@ -48,8 +49,8 @@ whole class of I2C adapters. Each specific adapter driver either depends on an algorithm driver in the ``drivers/i2c/algos/`` subdirectory, or includes its own implementation. -A **slave** chip is a node that responds to communications when addressed -by the master. In Linux it is called a **client**. Client drivers are kept +A **target** chip is a node that responds to communications when addressed +by the controller. In Linux it is called a **client**. Client drivers are kept in a directory specific to the feature they provide, for example ``drivers/media/gpio/`` for GPIO expanders and ``drivers/media/i2c/`` for video-related chips. @@ -57,3 +58,13 @@ video-related chips. For the example configuration in figure, you will need a driver for your I2C adapter, and drivers for your I2C devices (usually one driver for each device). + +Outdated terminology +-------------------- + +In earlier I2C specifications, controller was named "master" and target was +named "slave". These terms have been obsoleted with v7 of the specification and +their use is also discouraged by the Linux Kernel Code of Conduct. You may +still find them in references to documentation which has not been updated. The +general attitude, however, is to use the inclusive terms: controller and +target. Work to replace the old terminology in the Linux Kernel is on-going. |
