linux-kernel - [PATCH 1/2] mfd: anatop: make register accessor more flexible and rename meaningfully

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Message-Id: <1336870794-6351-1-git-send-email-richard.zhao@freescale.com>
Date:	Sun, 13 May 2012 08:59:53 +0800
From:	Richard Zhao <richard.zhao@...aro.org>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	sameo@...ux.intel.com, paul.liu@...aro.org,
	broonie@...nsource.wolfsonmicro.com, shawn.guo@...aro.org,
	Richard Zhao <richard.zhao@...escale.com>
Subject: [PATCH 1/2] mfd: anatop: make register accessor more flexible and rename meaningfully

 - rename to anatop_read_reg and anatop_write_reg
 - anatop_read_reg directly return reg value
 - anatop_write_reg write reg with mask

Signed-off-by: Richard Zhao <richard.zhao@...escale.com>
---
 drivers/mfd/anatop-mfd.c             |   35 +++++++++++-----------------------
 drivers/regulator/anatop-regulator.c |   18 ++++++++---------
 include/linux/mfd/anatop.h           |    4 ++--
 3 files changed, 21 insertions(+), 36 deletions(-)

diff --git a/drivers/mfd/anatop-mfd.c b/drivers/mfd/anatop-mfd.c
index 2af4248..3bb7c49 100644
--- a/drivers/mfd/anatop-mfd.c
+++ b/drivers/mfd/anatop-mfd.c
@@ -41,39 +41,26 @@
 #include <linux/of_address.h>
 #include <linux/mfd/anatop.h>
 
-u32 anatop_get_bits(struct anatop *adata, u32 addr, int bit_shift,
-		    int bit_width)
+u32 anatop_read_reg(struct anatop *adata, u32 addr)
 {
-	u32 val, mask;
-
-	if (bit_width == 32)
-		mask = ~0;
-	else
-		mask = (1 << bit_width) - 1;
-
-	val = readl(adata->ioreg + addr);
-	val = (val >> bit_shift) & mask;
-
-	return val;
+	return readl(adata->ioreg + addr);
 }
-EXPORT_SYMBOL_GPL(anatop_get_bits);
+EXPORT_SYMBOL_GPL(anatop_read_reg);
 
-void anatop_set_bits(struct anatop *adata, u32 addr, int bit_shift,
-		     int bit_width, u32 data)
+void anatop_write_reg(struct anatop *adata, u32 addr, u32 data, u32 mask)
 {
-	u32 val, mask;
+	u32 val;
 
-	if (bit_width == 32)
-		mask = ~0;
-	else
-		mask = (1 << bit_width) - 1;
+	data &= mask;
 
 	spin_lock(&adata->reglock);
-	val = readl(adata->ioreg + addr) & ~(mask << bit_shift);
-	writel((data << bit_shift) | val, adata->ioreg + addr);
+	val = readl(adata->ioreg + addr);
+	val |= data;
+	val &= ~data;
+	writel(val, adata->ioreg + addr);
 	spin_unlock(&adata->reglock);
 }
-EXPORT_SYMBOL_GPL(anatop_set_bits);
+EXPORT_SYMBOL_GPL(anatop_write_reg);
 
 static const struct of_device_id of_anatop_match[] = {
 	{ .compatible = "fsl,imx6q-anatop", },
diff --git a/drivers/regulator/anatop-regulator.c b/drivers/regulator/anatop-regulator.c
index 81fd606..0a34085 100644
--- a/drivers/regulator/anatop-regulator.c
+++ b/drivers/regulator/anatop-regulator.c
@@ -47,7 +47,7 @@ static int anatop_set_voltage(struct regulator_dev *reg, int min_uV,
 				  int max_uV, unsigned *selector)
 {
 	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
-	u32 val, sel;
+	u32 val, sel, mask;
 	int uv;
 
 	uv = min_uV;
@@ -71,11 +71,10 @@ static int anatop_set_voltage(struct regulator_dev *reg, int min_uV,
 	val = anatop_reg->min_bit_val + sel;
 	*selector = sel;
 	dev_dbg(&reg->dev, "%s: calculated val %d\n", __func__, val);
-	anatop_set_bits(anatop_reg->mfd,
-			anatop_reg->control_reg,
-			anatop_reg->vol_bit_shift,
-			anatop_reg->vol_bit_width,
-			val);
+	mask = ((1 << anatop_reg->vol_bit_width) - 1) <<
+		anatop_reg->vol_bit_shift;
+	val <<= anatop_reg->vol_bit_shift;
+	anatop_write_reg(anatop_reg->mfd, anatop_reg->control_reg, val, mask);
 
 	return 0;
 }
@@ -88,10 +87,9 @@ static int anatop_get_voltage_sel(struct regulator_dev *reg)
 	if (!anatop_reg->control_reg)
 		return -ENOTSUPP;
 
-	val = anatop_get_bits(anatop_reg->mfd,
-			      anatop_reg->control_reg,
-			      anatop_reg->vol_bit_shift,
-			      anatop_reg->vol_bit_width);
+	val = anatop_read_reg(anatop_reg->mfd, anatop_reg->control_reg);
+	val = (val & ((1 << anatop_reg->vol_bit_width) - 1)) >>
+		anatop_reg->vol_bit_shift;
 
 	return val - anatop_reg->min_bit_val;
 }
diff --git a/include/linux/mfd/anatop.h b/include/linux/mfd/anatop.h
index 22c1007..7f92acf 100644
--- a/include/linux/mfd/anatop.h
+++ b/include/linux/mfd/anatop.h
@@ -34,7 +34,7 @@ struct anatop {
 	spinlock_t reglock;
 };
 
-extern u32 anatop_get_bits(struct anatop *, u32, int, int);
-extern void anatop_set_bits(struct anatop *, u32, int, int, u32);
+extern u32 anatop_read_reg(struct anatop *, u32);
+extern void anatop_write_reg(struct anatop *, u32, u32, u32);
 
 #endif /*  __LINUX_MFD_ANATOP_H */
-- 
1.7.9.5

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