[PATCH] commands: regulator: add option to list provider devices

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Especially on SCMI boards, it isn't immediately clear if e.g. reg11 is
supplied by a directly accessed regulator or by the secure world.

Give the regulator command a -D option to list devices that the
regulator is associated with as well.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 commands/regulator.c     | 11 ++++++++---
 drivers/regulator/core.c | 27 ++++++++++++++++++++-------
 include/regulator.h      |  5 ++++-
 3 files changed, 32 insertions(+), 11 deletions(-)

diff --git a/commands/regulator.c b/commands/regulator.c
index e6b2f4852db4..3e38b616469f 100644
--- a/commands/regulator.c
+++ b/commands/regulator.c
@@ -11,9 +11,10 @@
 static int do_regulator(int argc, char *argv[])
 {
 	struct regulator *chosen;
+	unsigned flags = 0;
 	int opt, ret;
 
-	while ((opt = getopt(argc, argv, "e:d:")) > 0) {
+	while ((opt = getopt(argc, argv, "e:d:D")) > 0) {
 		switch (opt) {
 		case 'e':
 		case 'd':
@@ -27,12 +28,15 @@ static int do_regulator(int argc, char *argv[])
 				         : regulator_disable(chosen);
 			regulator_put(chosen);
 			return ret;
+		case 'D':
+			flags |= REGULATOR_PRINT_DEVS;
+			break;
 		default:
 			return COMMAND_ERROR_USAGE;
 		}
 	}
 
-	regulators_print();
+	regulators_print(flags);
 	return 0;
 }
 
@@ -42,12 +46,13 @@ BAREBOX_CMD_HELP_START(regulator)
 	BAREBOX_CMD_HELP_TEXT("Options:")
 	BAREBOX_CMD_HELP_OPT("-e REGULATOR\t", "enable REGULATOR")
 	BAREBOX_CMD_HELP_OPT("-d REGULATOR\t", "disable REGULATOR")
+	BAREBOX_CMD_HELP_OPT("-D\t", "list provider devices of regulators")
 BAREBOX_CMD_HELP_END
 
 BAREBOX_CMD_START(regulator)
 	.cmd		= do_regulator,
 	BAREBOX_CMD_DESC("list and control regulators")
-	BAREBOX_CMD_OPTS("[-ed] [REGULATOR]")
+	BAREBOX_CMD_OPTS("[-edD] [REGULATOR]")
 	BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
 	BAREBOX_CMD_HELP(cmd_regulator_help)
 BAREBOX_CMD_END
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index b20a48e0f63c..bbba3b0b5712 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -729,20 +729,32 @@ int regulator_get_voltage(struct regulator *regulator)
 }
 EXPORT_SYMBOL_GPL(regulator_get_voltage);
 
-static void regulator_print_one(struct regulator_dev *rdev, int level)
+static int regulator_name_indent(unsigned flags)
 {
+	return 30 + (flags & REGULATOR_PRINT_DEVS ? 50 : 0);
+}
+
+static void regulator_print_one(struct regulator_dev *rdev, int level, unsigned flags)
+{
+	const char *name = rdev->name;
 	struct regulator *r;
+	char buf[256];
 
 	if (!rdev)
 		return;
 
+	if (flags & REGULATOR_PRINT_DEVS) {
+		snprintf(buf, sizeof(buf), "%s  %s", dev_name(rdev->dev), rdev->name);
+		name = buf;
+	}
+
 	printf("%*s%-*s %6d %10d %10d\n", level * 3, "",
-	       30 - level * 3,
-	       rdev->name, rdev->enable_count, rdev->min_uv, rdev->max_uv);
+	       regulator_name_indent(flags) - level * 3,
+	       name, rdev->enable_count, rdev->min_uv, rdev->max_uv);
 
 	list_for_each_entry(r, &rdev->consumer_list, list) {
 		if (r->rdev_consumer)
-			regulator_print_one(r->rdev_consumer, level + 1);
+			regulator_print_one(r->rdev_consumer, level + 1, flags);
 		else
 			printf("%*s%s\n", (level + 1) * 3, "", r->dev ? dev_name(r->dev) : "none");
 	}
@@ -751,13 +763,14 @@ static void regulator_print_one(struct regulator_dev *rdev, int level)
 /*
  * regulators_print - print informations about all regulators
  */
-void regulators_print(void)
+void regulators_print(unsigned flags)
 {
 	struct regulator_dev *rdev;
 
-	printf("%-30s %6s %10s %10s\n", "name", "enable", "min_uv", "max_uv");
+	printf("%-*s %6s %10s %10s\n", regulator_name_indent(flags),
+	       "name", "enable", "min_uv", "max_uv");
 	list_for_each_entry(rdev, &regulator_list, list) {
 		if (!rdev->supply)
-			regulator_print_one(rdev, 0);
+			regulator_print_one(rdev, 0, flags);
 	}
 }
diff --git a/include/regulator.h b/include/regulator.h
index 240dbce5e7da..135fe6d91fd3 100644
--- a/include/regulator.h
+++ b/include/regulator.h
@@ -2,6 +2,8 @@
 #ifndef __REGULATOR_H
 #define __REGULATOR_H
 
+#include <linux/bitops.h>
+
 struct device;
 
 /* struct regulator is an opaque object for consumers */
@@ -155,7 +157,8 @@ static inline int of_regulator_register(struct regulator_dev *rd,
 #endif
 int dev_regulator_register(struct regulator_dev *rd, const char *name);
 
-void regulators_print(void);
+#define REGULATOR_PRINT_DEVS	BIT(0)
+void regulators_print(unsigned flags);
 
 const char *rdev_get_name(struct regulator_dev *rdev);
 
-- 
2.39.2