Enable SPI1 on Beaglebone Black.

SPI1 was chosen because SPI0 shares the gpio pins with I2C1.

Sponsored by:	Rubicon Communications (Netgate)

sys/arm/conf/BEAGLEBONE

@@ -87,6 +87,10 @@ device		gpio
 device		gpioled
 device		gpiobacklight
 
+# SPI
+device		ti_spi
+device		spibus
+
 # ADC support
 device		ti_adc
 

sys/boot/fdt/dts/arm/beaglebone-black.dts

@@ -37,6 +37,16 @@
 			AM33XX_IOPAD(0x95c, PIN_INPUT_PULLUP | MUX_MODE2)	/* spi0_cs0.i2c1_scl */
 		>;
 	};
+
+	spi1_pins: pinmux_spi1_pins {
+		pinctrl-single,pins = <
+			AM33XX_IOPAD(0x964, PIN_INPUT_PULLUP | MUX_MODE2)	/* eCAP0_in_PWM0_out.spi1_cs1 */
+			AM33XX_IOPAD(0x990, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* mcasp0_aclkx.spi1_sclk */
+			AM33XX_IOPAD(0x994, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* mcasp0_fsx.spi1_d0 - miso */
+			AM33XX_IOPAD(0x998, PIN_INPUT_PULLUP | MUX_MODE3)	/* mcasp0_axr0.spi1_d1  - mosi */
+			AM33XX_IOPAD(0x99c, PIN_INPUT_PULLUP | MUX_MODE3)	/* mcasp0_ahclkr.spi1_cs0 */
+		>;
+	};
 };
 
 &i2c0 {
@@ -65,6 +75,13 @@
 	status = "okay";
 };
 
+&spi1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi1_pins>;
+
+	status = "okay";
+};
+
 &lcdc {
 	hdmi = <&tda998x>;
 };