clk: cs2000: enable clock skipping mode

CLK_IN skipping mode allows the PLL to maintain lock even when the
CLK_IN signal has missing pulses for up to 20 ms (t CS) at a time.
This patch enables it

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/clk-cs2000-cp.c

@@ -54,6 +54,7 @@
 #define ENDEV2		(0x1)
 
 /* FUNC_CFG1 */
+#define CLKSKIPEN	(1 << 7)
 #define REFCLKDIV(x)	(((x) & 0x3) << 3)
 #define REFCLKDIV_MASK	REFCLKDIV(0x3)
 
@@ -122,6 +123,11 @@ static int cs2000_enable_dev_config(struct cs2000_priv *priv, bool enable)
 	if (ret < 0)
 		return ret;
 
+	ret = cs2000_bset(priv, FUNC_CFG1, CLKSKIPEN,
+			  enable ? CLKSKIPEN : 0);
+	if (ret < 0)
+		return ret;
+
 	return 0;
 }