Hello Greg, On Thu, Apr 26, 2012 at 11:14:51PM +1000, gerg@xxxxxxxxxxxx wrote:
From: Greg Ungerer <gerg@xxxxxxxxxxx>
...
+/* + * Define macros to ease the pain of setting up the GPIO tables. There + * is two cases we need to deal with here, they cover all currently + * available ColdFire GPIO hardware. There is of course minor differences + * in the layout and number of bits in each ColdFire part, but the macros + * take all that in. + * + * Firstly is the conventional GPIO registers where we toggle individual + * bits in a register, preserving the other bits in the register. For + * lack of a better term I have called this the slow method. + */ +#define MCFGPS(mlabel, mbase, mngpio, mpddr, mpodr, mppdr) \
...
+/* + * Secondly is the faster case, where we have set and clear registers + * that allow us to set or clear a bit with a single write, not having + * to worry about preserving other bits. + */ +#define MCFGPF(mlabel, mbase, mngpio) \
That's perfectly clear. Thanks Philippe -- Philippe De Muyter +32 2 6101532 Macq SA rue de l'Aeronef 2 B-1140 Bruxelles -- To unsubscribe from this list: send the line "unsubscribe linux-m68k" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
