Hi Laurent, > BTW, what's the purpose of the shadow data register in the CPM GPIO chip > structure ? As the set operation is protected by a spinlock, the only use I > can think of is to prevent changing bits in the PDAT register for pins > configured as inputs. Is that correct ? If so this should be clearly > documented in the code.
It's for pins configured as open drain. See the discussion in: http://ozlabs.org/pipermail/linuxppc-dev/2008-January/050826.html Thanks, Jochen _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
