> -----Original Message----- > From: Segher Boessenkool [mailto:[EMAIL PROTECTED] > Sent: Thursday, July 12, 2007 1:54 AM > To: Wood Scott-B07421 > Cc: Zhang Wei-r63237; linuxppc-dev@ozlabs.org; [EMAIL PROTECTED] > Subject: Re: [PATCH 1/4] Add DMA sector to > Documentation/powerpc/booting-without-of.txt file. > > >>> I'd rather just treat the different DMA channels as independent > >>> devices, > >>> rather than children of a dma "bus", and change the compatible > >>> name if > >>> they're not general purpose. There's only one register that's > >>> shared > >>> among the channels, and it's a superfluous status summary > register. > >>> > >> Your and my ideas are both sides of a coin. :-) > > > > I think there's a substantive difference between them. > Making each > > channel an independent device makes it easier for other drivers to > > use them. > > True. If the DMA channels are independent enough, putting them > in nodes of their own isn't too cumbersome, either. > >
If you want to use DMA engine driver for the reserved channel, you should add it to dma-controller node and assign 'reserved'. If you don't want to use DMA engine driver, just remove it from dma-controller node and put the channel to special device node. Thanks! Wei. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
