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can: c_can: prepare to up the message objects number
As pointed by commit c0a9f4d ("can: c_can: Reduce register access") the "driver casts the 16 message objects in stone, which is completely braindead as contemporary hardware has up to 128 message objects". The patch prepares the module to extend the number of message objects beyond the 32 currently managed. This was achieved by transforming the constants used to manage RX/TX messages into variables without changing the driver policy. Signed-off-by: Dario Binacchi <dariobin@libero.it>
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