mfd: max8925: Add irqdomain for dt

Add irqdomains for max8925's main irq, wrap irq register operations
into irqdomain's map func. it is necessary for dt support.

Also, add dt support for max8925 driver.

Signed-off-by: Qing Xu <qingx@marvell.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 33 insertions, 3 deletions

diff --git a/drivers/mfd/max8925-i2c.c b/drivers/mfd/max8925-i2c.c
index 00b5b456063..92bbebd3159 100644
--- a/drivers/mfd/max8925-i2c.c
+++ b/drivers/mfd/max8925-i2c.c
@@ -135,13 +135,37 @@ static const struct i2c_device_id max8925_id_table[] = {
 };
 MODULE_DEVICE_TABLE(i2c, max8925_id_table);
 
+static int max8925_dt_init(struct device_node *np, struct device *dev,
+			   struct max8925_platform_data *pdata)
+{
+	int ret;
+
+	ret = of_property_read_u32(np, "maxim,tsc-irq", &pdata->tsc_irq);
+	if (ret) {
+		dev_err(dev, "Not found maxim,tsc-irq property\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
 static int max8925_probe(struct i2c_client *client,
 				   const struct i2c_device_id *id)
 {
 	struct max8925_platform_data *pdata = client->dev.platform_data;
 	static struct max8925_chip *chip;
-
-	if (!pdata) {
+	struct device_node *node = client->dev.of_node;
+
+	if (node && !pdata) {
+		/* parse DT to get platform data */
+		pdata = devm_kzalloc(&client->dev,
+				     sizeof(struct max8925_platform_data),
+				     GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+
+		if (max8925_dt_init(node, &client->dev, pdata))
+			return -EINVAL;
+	} else if (!pdata) {
 		pr_info("%s: platform data is missing\n", __func__);
 		return -EINVAL;
 	}
@@ -203,11 +227,18 @@ static int max8925_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(max8925_pm_ops, max8925_suspend, max8925_resume);
 
+static const struct of_device_id max8925_dt_ids[] = {
+	{ .compatible = "maxim,max8925", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, max8925_dt_ids);
+
 static struct i2c_driver max8925_driver = {
 	.driver	= {
 		.name	= "max8925",
 		.owner	= THIS_MODULE,
 		.pm     = &max8925_pm_ops,
+		.of_match_table = of_match_ptr(max8925_dt_ids),
 	},
 	.probe		= max8925_probe,
 	.remove		= max8925_remove,
@@ -217,7 +248,6 @@ static struct i2c_driver max8925_driver = {
 static int __init max8925_i2c_init(void)
 {
 	int ret;
-
 	ret = i2c_add_driver(&max8925_driver);
 	if (ret != 0)
 		pr_err("Failed to register MAX8925 I2C driver: %d\n", ret);