did something

vendor/periph.io/x/conn/v3/spi/func.go

@@ -0,0 +1,15 @@
+// Copyright 2018 The Periph Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
+
+package spi
+
+import "periph.io/x/conn/v3/pin"
+
+// Well known pin functionality.
+const (
+	CLK  pin.Func = "SPI_CLK"  // Clock
+	CS   pin.Func = "SPI_CS"   // Chip select
+	MISO pin.Func = "SPI_MISO" // Master in
+	MOSI pin.Func = "SPI_MOSI" // Master out
+)