[PATCH v1 2/4] regulator: tps6105x: add optional devicetree support

[Sven Van Asbroeck <thesven73@gmail.com>]

If regulator init data is not specified in the parent mfd
device's platform data, attempt to retrieve it from the
devicetree node.

Example:

i2c0 {
	tps61052@33 {
		compatible = "ti,tps61052";
		reg = <0x33>;

		regulator {
			compatible = "ti,tps6105x-regulator";
			regulator-min-microvolt = <5000000>;
			regulator-max-microvolt = <5000000>;
			regulator-always-on;
		};
	};
};

Tree: next-20191118
Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com>
---
 drivers/regulator/tps6105x-regulator.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/tps6105x-regulator.c b/drivers/regulator/tps6105x-regulator.c
index 06059a94f7c6..9bc4e869fc4c 100644
--- a/drivers/regulator/tps6105x-regulator.c
+++ b/drivers/regulator/tps6105x-regulator.c
@@ -18,6 +18,7 @@
 #include <linux/regulator/driver.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/tps6105x.h>
+#include <linux/regulator/of_regulator.h>
 
 static const unsigned int tps6105x_voltages[] = {
 	4500000,
@@ -58,6 +59,7 @@ static int tps6105x_regulator_probe(struct platform_device *pdev)
 {
 	struct tps6105x *tps6105x = dev_get_platdata(&pdev->dev);
 	struct tps6105x_platform_data *pdata = tps6105x->pdata;
+	struct regulator_init_data *init_data = pdata->regulator_data;
 	struct regulator_config config = { };
 	int ret;
 
@@ -68,8 +70,14 @@ static int tps6105x_regulator_probe(struct platform_device *pdev)
 		return 0;
 	}
 
+	if (!init_data)
+		init_data = of_get_regulator_init_data(
+					&pdev->dev, pdev->dev.of_node,
+					&tps6105x_regulator_desc);
+	if (!init_data)
+		return -EINVAL;
 	config.dev = &tps6105x->client->dev;
-	config.init_data = pdata->regulator_data;
+	config.init_data = init_data;
 	config.driver_data = tps6105x;
 	config.regmap = tps6105x->regmap;
 
-- 
2.17.1