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| author | David Brownell <david-b@pacbell.net> | 2007-05-02 01:26:31 +0400 |
|---|---|---|
| committer | Jean Delvare <khali@hyperion.delvare> | 2007-05-02 01:26:31 +0400 |
| commit | 9c1600eda42e52796f49b36cf15b9debcfd09bea (patch) | |
| tree | fe93f5924c7777cd5c3cc1ef6033dd2dfae542b5 /drivers/i2c/Kconfig | |
| parent | 4298cfc3eb6110df989f784be516c6340c597a66 (diff) | |
| download | linux-9c1600eda42e52796f49b36cf15b9debcfd09bea.tar.xz | |
i2c: Add i2c_board_info and i2c_new_device()
This provides partial support for new-style I2C driver binding. It builds
on "struct i2c_board_info" declarations that identify I2C devices on a given
board. This is needed on systems with I2C devices that can't be fully probed
and/or autoconfigured, such as many embedded Linux configurations where the
way a given I2C device is wired may affect how it must be used.
There are two models for declaring such devices:
* LATE -- using a public function i2c_new_device(). This lets modules
declare I2C devices found *AFTER* a given I2C adapter becomes available.
For example, a PCI card could create adapters giving access to utility
chips on that card, and this would be used to associate those chips with
those adapters.
* EARLY -- from arch_initcall() level code, using a non-exported function
i2c_register_board_info(). This copies the declarations *BEFORE* such
an i2c_adapter becomes available, arranging that i2c_new_device() will
be called later when i2c-core registers the relevant i2c_adapter.
For example, arch/.../.../board-*.c files would declare the I2C devices
along with their platform data, and I2C devices would behave much like
PNPACPI devices. (That is, both enumerate from board-specific tables.)
To match the exported i2c_new_device(), the previously-private function
i2c_unregister_device() is now exported.
Pending later patches using these new APIs, this is effectively a NOP.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c/Kconfig')
| -rw-r--r-- | drivers/i2c/Kconfig | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig index 11935f66fcd8..74c8518b69e7 100644 --- a/drivers/i2c/Kconfig +++ b/drivers/i2c/Kconfig @@ -22,6 +22,11 @@ config I2C This I2C support can also be built as a module. If so, the module will be called i2c-core. +config I2C_BOARDINFO + boolean + depends on I2C + default y + config I2C_CHARDEV tristate "I2C device interface" depends on I2C |