pinctrl: mvebu: armada-xp: add nand rb function

The latest version of the Armada XP datasheet documents a new
NAND-related MPP function on MPP48, for which this commit adds
support.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/marvell,armada-xp-pinctrl.txt

@@ -73,7 +73,7 @@ mpp46         46       gpio, uart3(rts), uart1(rts), spi0(cs6), sata0(prsnt),
                        spi1(cs6)
 mpp47         47       gpio, uart3(cts), uart1(cts), spi0(cs7), pcie(clkreq3),
                        ref(clkout), spi1(cs7)
-mpp48         48       gpio, dev(clkout), dev(burst/last)
+mpp48         48       gpio, dev(clkout), dev(burst/last), nand(rb)
 
 * Marvell Armada XP (mv78260 and mv78460 only)
 

drivers/pinctrl/mvebu/pinctrl-armada-xp.c

@@ -299,7 +299,8 @@ static struct mvebu_mpp_mode armada_xp_mpp_modes[] = {
 	MPP_MODE(48,
 		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_MV78230_PLUS),
 		 MPP_VAR_FUNCTION(0x1, "dev", "clkout",     V_MV78230_PLUS),
-		 MPP_VAR_FUNCTION(0x2, "dev", "burst/last", V_MV78230_PLUS)),
+		 MPP_VAR_FUNCTION(0x2, "dev", "burst/last", V_MV78230_PLUS),
+		 MPP_VAR_FUNCTION(0x3, "nand", "rb",        V_MV78230_PLUS)),
 	MPP_MODE(49,
 		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_MV78260_PLUS),
 		 MPP_VAR_FUNCTION(0x1, "dev", "we3",        V_MV78260_PLUS)),