dm: regulator: uclass driver code cleanup

This cleanup includes:
- remove of the preprocessor macros which pointed to long name functions
- update of the names of some regulator uclass driver functions
- cleanup of the function regulator_autoset()
- reword of some comments of regulator uclass header file
- regulator_get_by_platname: check error for uclass_find_* function calls
- add function: regulator_name_is_unique
- regulator post_bind(): check regulator name uniqueness
- fix mistakes in: regulator/Kconfig
- regulator.h: update comments
- odroid u3: cleanup the regulator calls

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested on sandbox:
Tested-by: Simon Glass <sjg@chromium.org>

2 files changed, 69 insertions, 37 deletions

diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index 54ce188743c..fd3cf351b1b 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -14,7 +14,7 @@ config DM_REGULATOR
 	It's important to call the device_bind() with the proper node offset,
 	when binding the regulator devices. The pmic_bind_childs() can be used
 	for this purpose if PMIC I/O driver is implemented or dm_scan_fdt_node()
-	otherwise. Detailed informations can be found in the header file.
+	otherwise. Detailed information can be found in the header file.
 
 config DM_REGULATOR_MAX77686
 	bool "Enable Driver Model for REGULATOR MAX77686"
diff --git a/drivers/power/regulator/regulator-uclass.c b/drivers/power/regulator/regulator-uclass.c
index 07ce2869e6f..31ffd44454c 100644
--- a/drivers/power/regulator/regulator-uclass.c
+++ b/drivers/power/regulator/regulator-uclass.c
@@ -108,16 +108,19 @@ int regulator_set_mode(struct udevice *dev, int mode)
 	return ops->set_mode(dev, mode);
 }
 
-int regulator_by_platname(const char *plat_name, struct udevice **devp)
+int regulator_get_by_platname(const char *plat_name, struct udevice **devp)
 {
 	struct dm_regulator_uclass_platdata *uc_pdata;
 	struct udevice *dev;
+	int ret;
 
 	*devp = NULL;
 
-	for (uclass_find_first_device(UCLASS_REGULATOR, &dev);
-	     dev;
-	     uclass_find_next_device(&dev)) {
+	for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev;
+	     ret = uclass_find_next_device(&dev)) {
+		if (ret)
+			continue;
+
 		uc_pdata = dev_get_uclass_platdata(dev);
 		if (!uc_pdata || strcmp(plat_name, uc_pdata->name))
 			continue;
@@ -130,12 +133,12 @@ int regulator_by_platname(const char *plat_name, struct udevice **devp)
 	return -ENODEV;
 }
 
-int regulator_by_devname(const char *devname, struct udevice **devp)
+int regulator_get_by_devname(const char *devname, struct udevice **devp)
 {
 	return uclass_get_device_by_name(UCLASS_REGULATOR, devname, devp);
 }
 
-static int setting_failed(int ret, bool verbose, const char *fmt, ...)
+static int failed(int ret, bool verbose, const char *fmt, ...)
 {
 	va_list args;
 	char buf[64];
@@ -157,19 +160,18 @@ static int setting_failed(int ret, bool verbose, const char *fmt, ...)
 	return ret;
 }
 
-int regulator_by_platname_autoset_and_enable(const char *platname,
-					     struct udevice **devp,
-					     bool verbose)
+int regulator_autoset(const char *platname,
+		      struct udevice **devp,
+		      bool verbose)
 {
 	struct dm_regulator_uclass_platdata *uc_pdata;
 	struct udevice *dev;
-	bool v = verbose;
 	int ret;
 
 	if (devp)
 		*devp = NULL;
 
-	ret = regulator_by_platname(platname, &dev);
+	ret = regulator_get_by_platname(platname, &dev);
 	if (ret) {
 		error("Can get the regulator: %s!", platname);
 		return ret;
@@ -181,7 +183,10 @@ int regulator_by_platname_autoset_and_enable(const char *platname,
 		return -ENXIO;
 	}
 
-	if (v)
+	if (!uc_pdata->always_on && !uc_pdata->boot_on)
+		goto retdev;
+
+	if (verbose)
 		printf("%s@%s: ", dev->name, uc_pdata->name);
 
 	/* Those values are optional (-ENODATA if unset) */
@@ -189,7 +194,7 @@ int regulator_by_platname_autoset_and_enable(const char *platname,
 	    (uc_pdata->max_uV != -ENODATA) &&
 	    (uc_pdata->min_uV == uc_pdata->max_uV)) {
 		ret = regulator_set_value(dev, uc_pdata->min_uV);
-		if (setting_failed(ret, v, "set %d uV", uc_pdata->min_uV))
+		if (failed(ret, verbose, "set %d uV", uc_pdata->min_uV))
 			goto exit;
 	}
 
@@ -198,49 +203,69 @@ int regulator_by_platname_autoset_and_enable(const char *platname,
 	    (uc_pdata->max_uA != -ENODATA) &&
 	    (uc_pdata->min_uA == uc_pdata->max_uA)) {
 		ret = regulator_set_current(dev, uc_pdata->min_uA);
-		if (setting_failed(ret, v, "; set %d uA", uc_pdata->min_uA))
+		if (failed(ret, verbose, "; set %d uA", uc_pdata->min_uA))
 			goto exit;
 	}
 
-	if (!uc_pdata->always_on && !uc_pdata->boot_on)
-		goto retdev;
-
 	ret = regulator_set_enable(dev, true);
-	if (setting_failed(ret, v, "; enabling", uc_pdata->min_uA))
+	if (failed(ret, verbose, "; enabling", uc_pdata->min_uA))
 		goto exit;
 
 retdev:
 	if (devp)
 		*devp = dev;
 exit:
-	if (v)
+	if (verbose)
 		printf("\n");
+
 	return ret;
 }
 
-int regulator_by_platname_list_autoset_and_enable(const char *list_platname[],
-						  int list_entries,
-						  struct udevice *list_devp[],
-						  bool verbose)
+int regulator_list_autoset(const char *list_platname[],
+			   struct udevice *list_devp[],
+			   bool verbose)
 {
 	struct udevice *dev;
-	int i, ret, success = 0;
+	int error = 0, i = 0, ret;
 
-	for (i = 0; i < list_entries; i++) {
+	while (list_platname[i]) {
 		ret = regulator_autoset(list_platname[i], &dev, verbose);
-		if (!ret)
-			success++;
+		if (ret & !error)
+			error = ret;
+
+		if (list_devp)
+			list_devp[i] = dev;
+
+		i++;
+	}
+
+	return error;
+}
+
+static bool regulator_name_is_unique(struct udevice *check_dev,
+				     const char *check_name)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	struct udevice *dev;
+	int check_len = strlen(check_name);
+	int ret;
+	int len;
 
-		if (!list_devp)
+	for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev;
+	     ret = uclass_find_next_device(&dev)) {
+		if (ret || dev == check_dev)
 			continue;
 
-		if (ret)
-			list_devp[i] = NULL;
-		else
-			list_devp[i] = dev;
+		uc_pdata = dev_get_uclass_platdata(dev);
+		len = strlen(uc_pdata->name);
+		if (len != check_len)
+			continue;
+
+		if (!strcmp(uc_pdata->name, check_name))
+			return false;
 	}
 
-	return (success != list_entries);
+	return true;
 }
 
 static int regulator_post_bind(struct udevice *dev)
@@ -248,20 +273,27 @@ static int regulator_post_bind(struct udevice *dev)
 	struct dm_regulator_uclass_platdata *uc_pdata;
 	int offset = dev->of_offset;
 	const void *blob = gd->fdt_blob;
+	const char *property = "regulator-name";
 
 	uc_pdata = dev_get_uclass_platdata(dev);
 	if (!uc_pdata)
 		return -ENXIO;
 
 	/* Regulator's mandatory constraint */
-	uc_pdata->name = fdt_getprop(blob, offset, "regulator-name", NULL);
+	uc_pdata->name = fdt_getprop(blob, offset, property, NULL);
 	if (!uc_pdata->name) {
 		debug("%s: dev: %s has no property 'regulator-name'\n",
 		      __func__, dev->name);
-		return -ENXIO;
+		return -EINVAL;
 	}
 
-	return 0;
+	if (regulator_name_is_unique(dev, uc_pdata->name))
+		return 0;
+
+	error("\"%s\" of dev: \"%s\", has nonunique value: \"%s\"",
+	      property, dev->name, uc_pdata->name);
+
+	return -EINVAL;
 }
 
 static int regulator_pre_probe(struct udevice *dev)