docs: driver-api: i2c: remove some outdated information
a) Linux can be an I2C slave meanwhile b) all drivers except one use the driver model currently Update the documentation. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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@ -13,8 +13,8 @@ I2C is a multi-master bus; open drain signaling is used to arbitrate
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between masters, as well as to handshake and to synchronize clocks from
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between masters, as well as to handshake and to synchronize clocks from
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slower clients.
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slower clients.
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The Linux I2C programming interfaces support only the master side of bus
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The Linux I2C programming interfaces support the master side of bus
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interactions, not the slave side. The programming interface is
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interactions and the slave side. The programming interface is
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structured around two kinds of driver, and two kinds of device. An I2C
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structured around two kinds of driver, and two kinds of device. An I2C
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"Adapter Driver" abstracts the controller hardware; it binds to a
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"Adapter Driver" abstracts the controller hardware; it binds to a
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physical device (perhaps a PCI device or platform_device) and exposes a
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physical device (perhaps a PCI device or platform_device) and exposes a
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@ -22,9 +22,8 @@ physical device (perhaps a PCI device or platform_device) and exposes a
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I2C bus segment it manages. On each I2C bus segment will be I2C devices
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I2C bus segment it manages. On each I2C bus segment will be I2C devices
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represented by a :c:type:`struct i2c_client <i2c_client>`.
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represented by a :c:type:`struct i2c_client <i2c_client>`.
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Those devices will be bound to a :c:type:`struct i2c_driver
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Those devices will be bound to a :c:type:`struct i2c_driver
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<i2c_driver>`, which should follow the standard Linux driver
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<i2c_driver>`, which should follow the standard Linux driver model. There
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model. (At this writing, a legacy model is more widely used.) There are
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are functions to perform various I2C protocol operations; at this writing
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functions to perform various I2C protocol operations; at this writing
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all such functions are usable only from task context.
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all such functions are usable only from task context.
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The System Management Bus (SMBus) is a sibling protocol. Most SMBus
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The System Management Bus (SMBus) is a sibling protocol. Most SMBus
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