linux-kernel - [PATCH v2 1/4] mfd: arizona: Factor out SYSCLK enable from wm5102 hardware patch

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Date:	Tue, 17 Mar 2015 16:11:09 +0000
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	lee.jones@...aro.org, broonie@...nel.org
Cc:	sameo@...ux.intel.com, lgirdwood@...il.com,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/4] 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@...nsource.wolfsonmicro.com>
---

Changes since v1:
 - Added some comments in patch 4 to explain the exact regulator voltage
   ranges
 - Removed the reset patch, whilst I work on the suggestions by Mark, the
   rest of the series is useful in its own right and doesn't need to be
   blocked by that

Thanks,
Charles

 drivers/mfd/arizona-core.c |   48 ++++++++++++++++++++++++++++---------------
 1 files changed, 31 insertions(+), 17 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 6ca6dfa..ef1f8aa 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -250,7 +250,8 @@ static int arizona_wait_for_boot(struct arizona *arizona)
 	return ret;
 }
 
-static int arizona_apply_hardware_patch(struct arizona* arizona)
+static int arizona_exec_with_sysclk(struct arizona *arizona,
+				    int (*exec)(struct arizona *))
 {
 	unsigned int fll, sysclk;
 	int ret, err;
@@ -292,23 +293,8 @@ static int arizona_apply_hardware_patch(struct arizona* arizona)
 		goto err_fll;
 	}
 
-	/* 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 != 0) {
-		dev_err(arizona->dev, "Failed to start write sequencer: %d\n",
-			ret);
-		goto err_sysclk;
-	}
-	ret = arizona_poll_reg(arizona, 5, ARIZONA_WRITE_SEQUENCER_CTRL_1,
-			       ARIZONA_WSEQ_BUSY, 0);
-	if (ret != 0) {
-		regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0,
-				ARIZONA_WSEQ_ABORT);
-		ret = -ETIMEDOUT;
-	}
+	ret = exec(arizona);
 
-err_sysclk:
 	err = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, sysclk);
 	if (err != 0) {
 		dev_err(arizona->dev,
@@ -330,6 +316,34 @@ err_fll:
 		return err;
 }
 
+static int arizona_hardware_patch_wseq(struct arizona *arizona)
+{
+	int 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 != 0) {
+		dev_err(arizona->dev, "Failed to start write sequencer: %d\n",
+			ret);
+		return ret;
+	}
+	ret = arizona_poll_reg(arizona, 5, ARIZONA_WRITE_SEQUENCER_CTRL_1,
+			       ARIZONA_WSEQ_BUSY, 0);
+	if (ret != 0) {
+		regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0,
+				ARIZONA_WSEQ_ABORT);
+		ret = -ETIMEDOUT;
+	}
+
+	return ret;
+}
+
+static inline int arizona_apply_hardware_patch(struct arizona *arizona)
+{
+	return arizona_exec_with_sysclk(arizona, arizona_hardware_patch_wseq);
+}
+
 #ifdef CONFIG_PM
 static int arizona_runtime_resume(struct device *dev)
 {
-- 
1.7.2.5

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