linux-kernel - [PATCH 1/3] clk: cs2000: enable clock skipping mode

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Message-ID: <87shl6xy19.wl%kuninori.morimoto.gx@renesas.com>
Date:   Tue, 18 Apr 2017 02:18:19 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Stephen Boyd <sboyd@...eaurora.org>,
        Michael Turquette <mturquette@...libre.com>
CC:     <linux-renesas-soc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>
Subject: [PATCH 1/3] clk: cs2000: enable clock skipping mode


From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

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@...esas.com>
---
 drivers/clk/clk-cs2000-cp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/clk/clk-cs2000-cp.c b/drivers/clk/clk-cs2000-cp.c
index 4df38c5..a8fa6bd 100644
--- a/drivers/clk/clk-cs2000-cp.c
+++ b/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;
 }
 
-- 
1.9.1