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-rw-r--r--include/rng.h45
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diff --git a/include/rng.h b/include/rng.h
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2019, Linaro Limited
+ */
+
+#if !defined _RNG_H_
+#define _RNG_H_
+
+#include <linux/types.h>
+
+struct udevice;
+
+/**
+ * dm_rng_read() - read a random number seed from the rng device
+ *
+ * The function blocks until the requested number of bytes is read.
+ *
+ * @dev: random number generator device
+ * @buffer: input buffer to put the read random seed into
+ * @size: number of random bytes to read
+ * Return: 0 if OK, -ve on error
+ */
+int dm_rng_read(struct udevice *dev, void *buffer, size_t size);
+
+/**
+ * struct dm_rng_ops - operations for the hwrng uclass
+ *
+ * This structures contains the function implemented by a hardware random
+ * number generation device.
+ */
+struct dm_rng_ops {
+ /**
+ * @read: read a random bytes
+ *
+ * The function blocks until the requested number of bytes is read.
+ *
+ * @read.dev: random number generator device
+ * @read.data: input buffer to read the random seed into
+ * @read.max: number of random bytes to read
+ * @read.Return: 0 if OK, -ve on error
+ */
+ int (*read)(struct udevice *dev, void *data, size_t max);
+};
+
+#endif /* _RNG_H_ */