ASoC: rsnd: adg: care clock-frequency size

[ Upstream commit 69235ccf491d2e26aefd465c0d3ccd1e3b2a9a9c ]

ADG has buffer over flow bug if DT has more than 3 clock-frequency.
This patch fixup this issue, and uses first 2 values.

	clock-frequency = <x y>;	/* this is OK */
	clock-frequency = <x y z>;	/* this is NG */

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

sound/soc/sh/rcar/adg.c

@@ -467,6 +467,11 @@ static void rsnd_adg_get_clkout(struct rsnd_priv *priv,
 		goto rsnd_adg_get_clkout_end;
 
 	req_size = prop->length / sizeof(u32);
+	if (req_size > REQ_SIZE) {
+		dev_err(dev,
+			"too many clock-frequency, use top %d\n", REQ_SIZE);
+		req_size = REQ_SIZE;
+	}
 
 	of_property_read_u32_array(np, "clock-frequency", req_rate, req_size);
 	req_48kHz_rate = 0;