On 22:31 Wed 20 Jul , Sascha Hauer wrote: > On Wed, Jul 20, 2011 at 11:51:04PM +0400, Antony Pavlov wrote: > > Hi! > > > > In include/ns16550.h we have: > > > > struct NS16550_plat { > > unsigned int clock; > > unsigned char f_caps; > > /** > > * register read access capability > > */ > > unsigned int (*reg_read) (unsigned long base, unsigned char reg_offset); > > /** > > * register write access capability > > */ > > void (*reg_write) (unsigned int val, unsigned long base, > > unsigned char reg_offset); > > }; > > > > Why reg_read and reg_write's argument base has type unsigned long? > > IMHO pointer type (void * or char *) is more natural. > > You're right, I also wondered about this recently when looking at a > patch on the list. I would also rather see void __iomem *. The problem > is that this driver is also used on X86 which uses inb/outb which take > an integer argument. > The Linux driver works around this by having a membase and a iobase > field along with different register accessors. While being cleaner > I'm unsure if we want to go this way. we can do it via resoure and the flasgs IORESOURCE_MEM_8BIT, IORESOURCE_MEM_168BITi etc.. Best Regards, J. _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox