From 3850e3ee86c90e22767907fbd7505a717300c533 Mon Sep 17 00:00:00 2001
From: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Date: Mon, 11 May 2015 13:58:05 +0100
Subject: [PATCH] mfd: arizona: Factor out SYSCLK enable from wm5102 hardware
 patch

wm5102 applies a custom hardware boot sequence, for this the SYSCLK
needs to be enabled. This patch factors out the code that enables
SYSCLK for this sequence such that it can be used for other boot time
operations that require SYSCLK.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/mfd/arizona-core.c | 77 ++++++++++++++++++++++++++++----------
 1 file changed, 57 insertions(+), 20 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 326a4afdd832..b5a7e0efcf3e 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -264,19 +264,25 @@ static void arizona_disable_reset(struct arizona *arizona)
 	}
 }
 
-static int wm5102_apply_hardware_patch(struct arizona *arizona)
+struct arizona_sysclk_state {
+	unsigned int fll;
+	unsigned int sysclk;
+};
+
+static int arizona_enable_freerun_sysclk(struct arizona *arizona,
+					 struct arizona_sysclk_state *state)
 {
-	unsigned int fll, sysclk;
 	int ret, err;
 
 	/* Cache existing FLL and SYSCLK settings */
-	ret = regmap_read(arizona->regmap, ARIZONA_FLL1_CONTROL_1, &fll);
+	ret = regmap_read(arizona->regmap, ARIZONA_FLL1_CONTROL_1, &state->fll);
 	if (ret) {
 		dev_err(arizona->dev, "Failed to cache FLL settings: %d\n",
 			ret);
 		return ret;
 	}
-	ret = regmap_read(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, &sysclk);
+	ret = regmap_read(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1,
+			  &state->sysclk);
 	if (ret) {
 		dev_err(arizona->dev, "Failed to cache SYSCLK settings: %d\n",
 			ret);
@@ -306,14 +312,58 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona)
 		goto err_fll;
 	}
 
+	return 0;
+
+err_fll:
+	err = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, state->fll);
+	if (err)
+		dev_err(arizona->dev,
+			"Failed to re-apply old FLL settings: %d\n", err);
+
+	return ret;
+}
+
+static int arizona_disable_freerun_sysclk(struct arizona *arizona,
+					  struct arizona_sysclk_state *state)
+{
+	int ret;
+
+	ret = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1,
+			   state->sysclk);
+	if (ret) {
+		dev_err(arizona->dev,
+			"Failed to re-apply old SYSCLK settings: %d\n", ret);
+		return ret;
+	}
+
+	ret = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, state->fll);
+	if (ret) {
+		dev_err(arizona->dev,
+			"Failed to re-apply old FLL settings: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int wm5102_apply_hardware_patch(struct arizona *arizona)
+{
+	struct arizona_sysclk_state state;
+	int err, ret;
+
+	ret = arizona_enable_freerun_sysclk(arizona, &state);
+	if (ret)
+		return ret;
+
 	/* Start the write sequencer and wait for it to finish */
 	ret = regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0,
 			   ARIZONA_WSEQ_ENA | ARIZONA_WSEQ_START | 160);
 	if (ret) {
 		dev_err(arizona->dev, "Failed to start write sequencer: %d\n",
 			ret);
-		goto err_sysclk;
+		goto err;
 	}
+
 	ret = arizona_poll_reg(arizona, 5, ARIZONA_WRITE_SEQUENCER_CTRL_1,
 			       ARIZONA_WSEQ_BUSY, 0);
 	if (ret) {
@@ -322,21 +372,8 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona)
 		ret = -ETIMEDOUT;
 	}
 
-err_sysclk:
-	err = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, sysclk);
-	if (err) {
-		dev_err(arizona->dev,
-			"Failed to re-apply old SYSCLK settings: %d\n",
-			err);
-	}
-
-err_fll:
-	err = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, fll);
-	if (err) {
-		dev_err(arizona->dev,
-			"Failed to re-apply old FLL settings: %d\n",
-			err);
-	}
+err:
+	err = arizona_disable_freerun_sysclk(arizona, &state);
 
 	return ret ?: err;
 }
-- 
2.30.2