Hello

I have some minor comments below

+config HW_RANDOM_MESON
+	tristate "Amlogic Meson Random Number Generator support"
+	depends on HW_RANDOM && ARCH_MESON

Perhaps you could change to:
depends on HW_RANDOM
depends on ARCH_MESON || COMPILE_TEST

+
+static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct meson_rng_data *data =
+			container_of(rng, struct meson_rng_data, rng);
+
+	*(u32 *)buf = readl_relaxed(data->base + RNG_DATA);
+
+	return sizeof(u32);
+}

I think you need a test for max < sizeof(u32)

Regards

LABBE Corentin