Enable SPI on LTC. Use HPS LED for SD card activity.

arch/arm/boot/dts/socfpga_cyclone5_de10_nano.dts

@@ -47,7 +47,16 @@
 		hps0 {
 			label = "hps_led0";
 			gpios = <&portb 24 0>;
-			linux,default-trigger = "heartbeat";
+			linux,default-trigger = "mmc0";
+		};
+	};
+
+	ltcmode {
+		compatible = "gpio-leds";
+		ltcsw {
+			label = "ltc_sw";
+			gpios = <&portb 11 0>;
+			default-state = "off";
 		};
 	};
 };
@@ -109,6 +118,17 @@
         };
 };
 
+&spi1 {
+	status = "okay";
+	timeouts = <3>;
+	spibri {
+		status = "okay";
+		compatible = "altspi";
+		spi-max-frequency = <25000000>;
+		reg = <0>;
+	};
+};
+
 &mmc0 {
 	vmmc-supply = <&regulator_3_3v>;
 	vqmmc-supply = <&regulator_3_3v>;

drivers/spi/spidev.c

@@ -684,6 +684,7 @@ static const struct of_device_id spidev_dt_ids[] = {
 	{ .compatible = "menlo,m53cpld" },
 	{ .compatible = "cisco,spi-petra" },
 	{ .compatible = "micron,spi-authenta" },
+	{ .compatible = "altspi" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, spidev_dt_ids);