ad525x_dpot: use correct rdac channel for ad5251/ad5252

The ad5251/ad5252 devices have rdac1 and rdac3, but no rdac0.  So make
sure we use the right channels so userspace gets correct data and not just
garbage.

Signed-off-by: steven miao <realmz6@gmail.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Cc: Michael Hennerich <michael.hennerich@analog.com>
Cc: Chris Verges <chrisv@cyberswitching.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/misc/ad525x_dpot.h

@@ -47,9 +47,9 @@ enum dpot_devid {
 	AD5258_ID = DPOT_CONF(F_RDACS_RW_TOL, BRDAC0, 6, 0), /* I2C */
 	AD5259_ID = DPOT_CONF(F_RDACS_RW_TOL, BRDAC0, 8, 1),
 	AD5251_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
-			BRDAC0 | BRDAC3, 6, 2),
+			BRDAC1 | BRDAC3, 6, 2),
 	AD5252_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
-			BRDAC0 | BRDAC3, 8, 3),
+			BRDAC1 | BRDAC3, 8, 3),
 	AD5253_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
 			BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 6, 4),
 	AD5254_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,