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mcspi driver cpu ressources

Dear every one,

I am looking for a version of the mcspi driver under linux 2.6.39 or any recent kernel, which use less cpu ressources by implementing transfer under interruption not pooling as it work today.

Does anyone, have already implemented such driver, or does anyone know why the current one does not use neither interruption or fifo ?

Thanks in advance.

Christophe.