[PATCH v1 1/4] tps6105x: add optional devicetree support

[Sven Van Asbroeck <thesven73@xxxxxxxxx>]

This driver currently requires platform data to specify the
operational mode and regulator init data (in case of regulator
mode).

Optionally specify the operational mode by looking at the
'compatible' property of the devicetree child node.

Example: put chip in regulator mode:

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

		regulator {
			compatible = "ti,tps6105x-regulator";
		};
	};
};

Tree: next-20191118
Signed-off-by: Sven Van Asbroeck <TheSven73@xxxxxxxxx>
---
 drivers/mfd/tps6105x.c | 36 +++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/tps6105x.c b/drivers/mfd/tps6105x.c
index 6ac3607a79c2..401bd093b4ea 100644
--- a/drivers/mfd/tps6105x.c
+++ b/drivers/mfd/tps6105x.c
@@ -71,6 +71,7 @@ static struct mfd_cell tps6105x_gpio_cell = {
 
 static struct mfd_cell tps6105x_leds_cell = {
 	.name = "tps6105x-leds",
+	.of_compatible = "ti,tps6105x-leds",
 };
 
 static struct mfd_cell tps6105x_flash_cell = {
@@ -79,6 +80,7 @@ static struct mfd_cell tps6105x_flash_cell = {
 
 static struct mfd_cell tps6105x_regulator_cell = {
 	.name = "tps6105x-regulator",
+	.of_compatible = "ti,tps6105x-regulator",
 };
 
 static int tps6105x_add_device(struct tps6105x *tps6105x,
@@ -91,6 +93,32 @@ static int tps6105x_add_device(struct tps6105x *tps6105x,
 			       PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
 }
 
+static struct tps6105x_platform_data *tps6105x_parse_dt(struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	struct tps6105x_platform_data *pdata;
+	struct device_node *child;
+
+	if (!np)
+		return ERR_PTR(-EINVAL);
+	if (of_get_available_child_count(np) > 1) {
+		dev_err(dev, "cannot support multiple operational modes");
+		return ERR_PTR(-EINVAL);
+	}
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+	pdata->mode = TPS6105X_MODE_SHUTDOWN;
+	for_each_available_child_of_node(np, child) {
+		if (of_device_is_compatible(child, "ti,tps6105x-regulator"))
+			pdata->mode = TPS6105X_MODE_VOLTAGE;
+		else if (of_device_is_compatible(child, "ti,tps6105x-leds"))
+			pdata->mode = TPS6105X_MODE_TORCH;
+	}
+
+	return pdata;
+}
+
 static int tps6105x_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
@@ -99,9 +127,11 @@ static int tps6105x_probe(struct i2c_client *client,
 	int ret;
 
 	pdata = dev_get_platdata(&client->dev);
-	if (!pdata) {
-		dev_err(&client->dev, "missing platform data\n");
-		return -ENODEV;
+	if (!pdata)
+		pdata = tps6105x_parse_dt(&client->dev);
+	if (IS_ERR(pdata)) {
+		dev_err(&client->dev, "No platform data or DT found");
+		return PTR_ERR(pdata);
 	}
 
 	tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
-- 
2.17.1