linux-kernel - [PATCH] regulator: userspace-consumer: Retrieve supplies from DT

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Message-ID: <20230823203531.1382044-1-Naresh.Solanki@9elements.com>
Date:   Wed, 23 Aug 2023 22:35:30 +0200
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     zev@...ilderbeest.net,
        Naresh Solanki <Naresh.Solanki@...ements.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] regulator: userspace-consumer: Retrieve supplies from DT

Instead of hardcoding a single supply, retrieve supplies from DT.

Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
---
 drivers/regulator/userspace-consumer.c | 43 ++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/userspace-consumer.c b/drivers/regulator/userspace-consumer.c
index a0b980022993..830681446807 100644
--- a/drivers/regulator/userspace-consumer.c
+++ b/drivers/regulator/userspace-consumer.c
@@ -153,11 +153,32 @@ static int regulator_userspace_notify(struct notifier_block *nb,
 	return NOTIFY_OK;
 }
 
+#define SUPPLY_SUFFIX "-supply"
+#define SUPPLY_SUFFIX_LEN 7
+
+static int get_num_supplies(struct platform_device *pdev)
+{
+	struct  property *prop;
+	int num_supplies = 0;
+
+	for_each_property_of_node(pdev->dev.of_node, prop) {
+		const char *prop_name = prop->name;
+		int len = strlen(prop_name);
+
+		if (len > SUPPLY_SUFFIX_LEN && \
+		    strcmp(prop_name + len - SUPPLY_SUFFIX_LEN, SUPPLY_SUFFIX) == 0) {
+			num_supplies++;
+		}
+	}
+	return num_supplies;
+}
+
 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;
+	struct  property *prop;
 	int i, ret;
 
 	pdata = dev_get_platdata(&pdev->dev);
@@ -169,11 +190,27 @@ 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 = get_num_supplies(pdev);
+
+		pdata->supplies = devm_kzalloc(&pdev->dev, pdata->num_supplies * \
+					       sizeof(*pdata->supplies), GFP_KERNEL);
 		if (!pdata->supplies)
 			return -ENOMEM;
-		pdata->supplies[0].supply = "vout";
+
+		for_each_property_of_node(pdev->dev.of_node, prop) {
+			const char *prop_name = prop->name;
+			int len = strlen(prop_name);
+
+			if (len > 7 && \
+			    strcmp(prop_name + len - SUPPLY_SUFFIX_LEN, SUPPLY_SUFFIX) == 0) {
+				char *supply_name = devm_kzalloc(&pdev->dev,
+								 len - SUPPLY_SUFFIX_LEN + 1,
+								 GFP_KERNEL);
+				strscpy(supply_name, prop_name, len - SUPPLY_SUFFIX_LEN);
+				supply_name[len - SUPPLY_SUFFIX_LEN] = '\0';
+				pdata->supplies[0].supply = supply_name;
+			}
+		}
 	}
 
 	if (pdata->num_supplies < 1) {

base-commit: 8950c4a350c188deb5f5b05df3244d4db82fe3d8
-- 
2.41.0