[PATCH rtems 2/3] confdefs: Add configure macro for libi2c

[Sebastian Huber]

On 25.07.23 04:31, Vijay Kumar Banerjee wrote:
> On Mon, Jul 24, 2023 at 10:09 AM Sebastian Huber
> <sebastian.huber at embedded-brains.de>  wrote:
>> On 20.07.23 03:10, Vijay Kumar Banerjee wrote:
>>> Add CONFIGURE_APPLICATION_NEEDS_LIBI2C_DRIVER define
>> Do we really need this? What happens if an I2C device needs interrupts
>> during initialization?
>>
> the libi2c initialize calls rtems_io_register_driver, which requires
> `CONFIGURE_MAXIMUM_DRIVERS` defined from the application. In some
> BSPs, like mvme3100, libi2c is initialized at sysinit, causing the
> application to crash without the define. Adding this confdefs macro
> allows the user to add the libi2c if it is needed by the app, or omit
> it without crashing the system. In its current state, libi2c requires
> the BSP to handle registering the buses and drivers after
> initialization, the interrupt can be handled by the BSP I2C handler.

Ok, maybe one option is to use IMFS_make_generic_node() instead of using 
rtems_io_register_driver(). Another option is to use the new I2C framework.

If you really need this new application configuration option, then 
please document it:

https://docs.rtems.org/branches/master/eng/req/howto.html#application-configuration-options

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