v4.19.13 snapshot.
diff --git a/arch/sh/include/asm/adc.h b/arch/sh/include/asm/adc.h
new file mode 100644
index 0000000..99ec668
--- /dev/null
+++ b/arch/sh/include/asm/adc.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_ADC_H
+#define __ASM_ADC_H
+#ifdef __KERNEL__
+/*
+ * Copyright (C) 2004  Andriy Skulysh
+ */
+
+#include <cpu/adc.h>
+
+int adc_single(unsigned int channel);
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_ADC_H */