linux-kernel - [PATCH 2/2] regulator: userspace-consumer: Multiple regulators

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Date:   Tue, 18 Apr 2023 16:50:51 +0200
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     Naresh Solanki <Naresh.Solanki@...ements.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] regulator: userspace-consumer: Multiple regulators

Use property regulator-supplies to determine all regulator
supplies.
This is useful in case of a connector having 2 or more supplies.
Example: PCIe connector on mainboard can be powered by 12V & 3.3V
suplies.

Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
---
 drivers/regulator/userspace-consumer.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/regulator/userspace-consumer.c b/drivers/regulator/userspace-consumer.c
index 97f075ed68c9..0bb49547b926 100644
--- a/drivers/regulator/userspace-consumer.c
+++ b/drivers/regulator/userspace-consumer.c
@@ -120,7 +120,10 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev)
 	struct regulator_userspace_consumer_data tmpdata;
 	struct regulator_userspace_consumer_data *pdata;
 	struct userspace_consumer_data *drvdata;
-	int ret;
+	struct device_node *np = pdev->dev.of_node;
+	struct property *prop;
+	const char *supply;
+	int ret, count = 0;
 
 	pdata = dev_get_platdata(&pdev->dev);
 	if (!pdata) {
@@ -131,11 +134,19 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev)
 		memset(pdata, 0, sizeof(*pdata));
 
 		pdata->no_autoswitch = true;
-		pdata->num_supplies = 1;
-		pdata->supplies = devm_kzalloc(&pdev->dev, sizeof(*pdata->supplies), GFP_KERNEL);
+		pdata->num_supplies = of_property_count_strings(np, "regulator-supplies");
+		if (pdata->num_supplies < 0) {
+			dev_err(&pdev->dev, "could not parse property regulator-supplies");
+			return -EINVAL;
+		}
+		pdata->supplies = devm_kzalloc(&pdev->dev,
+					       sizeof(*pdata->supplies) * pdata->num_supplies,
+					       GFP_KERNEL);
 		if (!pdata->supplies)
 			return -ENOMEM;
-		pdata->supplies[0].supply = "vout";
+
+		of_property_for_each_string(np, "regulator-supplies", prop, supply)
+			pdata->supplies[count++].supply = supply;
 	}
 
 	if (pdata->num_supplies < 1) {
-- 
2.39.1