ARM: dts: am335x-evm: Add sleep pin settings for mcasp1

When McASP is not in use the pins can be put to sleep mode to conserve
power.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-evm.dts

@@ -351,6 +351,15 @@ mcasp1_pins: mcasp1_pins {
 		>;
 	};
 
+	mcasp1_pins_sleep: mcasp1_pins_sleep {
+		pinctrl-single,pins = <
+			0x10c (PIN_INPUT_PULLDOWN | MUX_MODE7)
+			0x110 (PIN_INPUT_PULLDOWN | MUX_MODE7)
+			0x108 (PIN_INPUT_PULLDOWN | MUX_MODE7)
+			0x144 (PIN_INPUT_PULLDOWN | MUX_MODE7)
+		>;
+	};
+
 	dcan1_pins_default: dcan1_pins_default {
 		pinctrl-single,pins = <
 			0x168 (PIN_OUTPUT | MUX_MODE2) /* uart0_ctsn.d_can1_tx */
@@ -575,8 +584,9 @@ partition@9 {
 #include "tps65910.dtsi"
 
 &mcasp1 {
-	pinctrl-names = "default";
+	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&mcasp1_pins>;
+	pinctrl-1 = <&mcasp1_pins_sleep>;
 
 	status = "okay";