linux-kernel - [PATCH] cs-2000-cp: keep Reserved bit on each register

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Message-ID: <8737dqnd90.wl%kuninori.morimoto.gx@renesas.com>
Date:   Mon, 3 Apr 2017 07:51:49 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        Simon <horms@...ge.net.au>, <linux-renesas-soc@...r.kernel.org>,
        Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@...esas.com>
Subject: [PATCH] cs-2000-cp: keep Reserved bit on each register


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

Thus CS2000 datasheet is indicating below, this patch
follows it.

WARNING: All "Reserved" registers must maintain their default
         state to ensure proper functional operation.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Tested-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@...esas.com>
---
 drivers/clk/clk-cs2000-cp.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/clk-cs2000-cp.c b/drivers/clk/clk-cs2000-cp.c
index 3fca052..f5915ff 100644
--- a/drivers/clk/clk-cs2000-cp.c
+++ b/drivers/clk/clk-cs2000-cp.c
@@ -36,15 +36,27 @@
 
 /* DEVICE_CTRL */
 #define PLL_UNLOCK	(1 << 7)
+#define AUXOUTDIS	(1 << 1)
+#define CLKOUTDIS	(1 << 0)
 
 /* DEVICE_CFG1 */
 #define RSEL(x)		(((x) & 0x3) << 3)
 #define RSEL_MASK	RSEL(0x3)
 #define ENDEV1		(0x1)
 
+/* DEVICE_CFG2 */
+#define AUTORMOD	(1 << 3)
+#define LOCKCLK(x)	(((x) & 0x3) << 1)
+#define LOCKCLK_MASK	LOCKCLK(0x3)
+#define FRACNSRC	(1 << 0)
+
 /* GLOBAL_CFG */
 #define ENDEV2		(0x1)
 
+/* FUNC_CFG1 */
+#define REFCLKDIV(x)	(((x) & 0x3) << 3)
+#define REFCLKDIV_MASK	REFCLKDIV(0x3)
+
 #define CH_SIZE_ERR(ch)		((ch < 0) || (ch >= CH_MAX))
 #define hw_to_priv(_hw)		container_of(_hw, struct cs2000_priv, hw)
 #define priv_to_client(priv)	(priv->client)
@@ -127,7 +139,9 @@ static int cs2000_clk_in_bound_rate(struct cs2000_priv *priv,
 	else
 		return -EINVAL;
 
-	return cs2000_bset(priv, FUNC_CFG1, 0x3 << 3, val << 3);
+	return cs2000_bset(priv, FUNC_CFG1,
+			   REFCLKDIV_MASK,
+			   REFCLKDIV(val));
 }
 
 static int cs2000_wait_pll_lock(struct cs2000_priv *priv)
@@ -153,7 +167,10 @@ static int cs2000_wait_pll_lock(struct cs2000_priv *priv)
 static int cs2000_clk_out_enable(struct cs2000_priv *priv, bool enable)
 {
 	/* enable both AUX_OUT, CLK_OUT */
-	return cs2000_write(priv, DEVICE_CTRL, enable ? 0 : 0x3);
+	return cs2000_bset(priv, DEVICE_CTRL,
+			   (AUXOUTDIS | CLKOUTDIS),
+			   enable ? 0 :
+			   (AUXOUTDIS | CLKOUTDIS));
 }
 
 static u32 cs2000_rate_to_ratio(u32 rate_in, u32 rate_out)
@@ -243,7 +260,9 @@ static int cs2000_ratio_select(struct cs2000_priv *priv, int ch)
 	if (ret < 0)
 		return ret;
 
-	ret = cs2000_write(priv, DEVICE_CFG2, 0x0);
+	ret = cs2000_bset(priv, DEVICE_CFG2,
+			  (AUTORMOD | LOCKCLK_MASK | FRACNSRC),
+			  0);
 	if (ret < 0)
 		return ret;
 
-- 
1.9.1