staging: hikey9xx: hi6421v600-regulator: do some cleanups

In preparation for de-staging, do some cleanups:

- Return error codes from hi6421_spmi_pmic_rmw();
- Remove a debug message;
- Change the module description;
- a few minor coding style adjustments.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/0bae0c05d997e4a5a0b3b86a65f3370dafb14596.1611212783.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/hikey9xx/hi6421v600-regulator.c

@@ -117,6 +117,7 @@ static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)
 {
 	struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
 	struct hi6421_spmi_pmic *pmic = sreg->pmic;
+	int ret;
 
 	/* cannot enable more than one regulator at one time */
 	mutex_lock(&sreg->enable_mutex);
@@ -124,13 +125,13 @@ static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)
 		     HISI_REGS_ENA_PROTECT_TIME + 1000);
 
 	/* set enable register */
-	hi6421_spmi_pmic_rmw(pmic, rdev->desc->enable_reg,
-			     rdev->desc->enable_mask,
-			     rdev->desc->enable_mask);
+	ret = hi6421_spmi_pmic_rmw(pmic, rdev->desc->enable_reg,
+				   rdev->desc->enable_mask,
+				   rdev->desc->enable_mask);
 
 	mutex_unlock(&sreg->enable_mutex);
 
-	return 0;
+	return ret;
 }
 
 static int hi6421_spmi_regulator_disable(struct regulator_dev *rdev)
@@ -139,10 +140,8 @@ static int hi6421_spmi_regulator_disable(struct regulator_dev *rdev)
 	struct hi6421_spmi_pmic *pmic = sreg->pmic;
 
 	/* set enable register to 0 */
-	hi6421_spmi_pmic_rmw(pmic, rdev->desc->enable_reg,
-			     rdev->desc->enable_mask, 0);
-
-	return 0;
+	return hi6421_spmi_pmic_rmw(pmic, rdev->desc->enable_reg,
+				    rdev->desc->enable_mask, 0);
 }
 
 static int hi6421_spmi_regulator_get_voltage_sel(struct regulator_dev *rdev)
@@ -154,7 +153,7 @@ static int hi6421_spmi_regulator_get_voltage_sel(struct regulator_dev *rdev)
 	/* get voltage selector */
 	reg_val = hi6421_spmi_pmic_read(pmic, rdev->desc->vsel_reg);
 
-	return (reg_val & rdev->desc->vsel_mask) >>	(ffs(rdev->desc->vsel_mask) - 1);
+	return (reg_val & rdev->desc->vsel_mask) >> (ffs(rdev->desc->vsel_mask) - 1);
 }
 
 static int hi6421_spmi_regulator_set_voltage_sel(struct regulator_dev *rdev,
@@ -164,16 +163,14 @@ static int hi6421_spmi_regulator_set_voltage_sel(struct regulator_dev *rdev,
 	struct hi6421_spmi_pmic *pmic = sreg->pmic;
 	u32 reg_val;
 
-	if (unlikely(selector >= rdev->desc->n_voltages))
+	if (selector >= rdev->desc->n_voltages)
 		return -EINVAL;
 
 	reg_val = selector << (ffs(rdev->desc->vsel_mask) - 1);
 
 	/* set voltage selector */
-	hi6421_spmi_pmic_rmw(pmic, rdev->desc->vsel_reg,
-			     rdev->desc->vsel_mask, reg_val);
-
-	return 0;
+	return hi6421_spmi_pmic_rmw(pmic, rdev->desc->vsel_reg,
+				    rdev->desc->vsel_mask, reg_val);
 }
 
 static unsigned int hi6421_spmi_regulator_get_mode(struct regulator_dev *rdev)
@@ -209,10 +206,8 @@ static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,
 	}
 
 	/* set mode */
-	hi6421_spmi_pmic_rmw(pmic, rdev->desc->enable_reg,
-			     sreg->eco_mode_mask, val);
-
-	return 0;
+	return hi6421_spmi_pmic_rmw(pmic, rdev->desc->enable_reg,
+				    sreg->eco_mode_mask, val);
 }
 
 static unsigned int
@@ -319,8 +314,6 @@ static int hi6421_spmi_regulator_probe(struct platform_device *pdev)
 		/* assign per-regulator data */
 		info = &regulator_info[i];
 
-		dev_dbg(dev, "adding regulator %s\n", info->desc.name);
-
 		config.dev = pdev->dev.parent;
 		config.driver_data = sreg;
 
@@ -344,12 +337,12 @@ MODULE_DEVICE_TABLE(platform, hi6421_spmi_regulator_table);
 static struct platform_driver hi6421_spmi_regulator_driver = {
 	.id_table = hi6421_spmi_regulator_table,
 	.driver = {
-		.name	= "hi6421v600-regulator",
+		.name = "hi6421v600-regulator",
 	},
 	.probe	= hi6421_spmi_regulator_probe,
 };
 module_platform_driver(hi6421_spmi_regulator_driver);
 
-MODULE_DESCRIPTION("Hi6421v600 regulator driver");
+MODULE_DESCRIPTION("Hi6421v600 SPMI regulator driver");
 MODULE_LICENSE("GPL v2");