[PATCH-v6 2/6] mfd: 88pm800: Add device tree support

[Vaibhav Hiremath]

Add DT support to the 88pm800 driver, along with compatible
field for it's sub-devices (rtc, onkey and regulator)

Signed-off-by: Chao Xie <chao.xie at marvell.com>
Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath at linaro.org>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski at samsung.com>
Acked-by: Lee Jones <lee.jones at linaro.org>
---
 drivers/mfd/88pm800.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/mfd/88pm800.c b/drivers/mfd/88pm800.c
index 0c5470e..95c418c 100644
--- a/drivers/mfd/88pm800.c
+++ b/drivers/mfd/88pm800.c
@@ -27,6 +27,7 @@
 #include <linux/mfd/core.h>
 #include <linux/mfd/88pm80x.h>
 #include <linux/slab.h>
+#include <linux/of_device.h>
 
 /* Interrupt Registers */
 #define PM800_INT_STATUS1		(0x05)
@@ -121,6 +122,11 @@ static const struct i2c_device_id pm80x_id_table[] = {
 };
 MODULE_DEVICE_TABLE(i2c, pm80x_id_table);
 
+static const struct of_device_id pm80x_of_match_table[] = {
+	{ .compatible = "marvell,88pm800", },
+	{},
+};
+
 static struct resource rtc_resources[] = {
 	{
 	 .name = "88pm80x-rtc",
@@ -133,6 +139,7 @@ static struct resource rtc_resources[] = {
 static struct mfd_cell rtc_devs[] = {
 	{
 	 .name = "88pm80x-rtc",
+	 .of_compatible = "marvell,88pm80x-rtc",
 	 .num_resources = ARRAY_SIZE(rtc_resources),
 	 .resources = &rtc_resources[0],
 	 .id = -1,
@@ -151,6 +158,7 @@ static struct resource onkey_resources[] = {
 static const struct mfd_cell onkey_devs[] = {
 	{
 	 .name = "88pm80x-onkey",
+	 .of_compatible = "marvell,88pm80x-onkey",
 	 .num_resources = 1,
 	 .resources = &onkey_resources[0],
 	 .id = -1,
@@ -160,6 +168,7 @@ static const struct mfd_cell onkey_devs[] = {
 static const struct mfd_cell regulator_devs[] = {
 	{
 	 .name = "88pm80x-regulator",
+	 .of_compatible = "marvell,88pm80x-regulator",
 	 .id = -1,
 	},
 };
@@ -520,8 +529,24 @@ static int pm800_probe(struct i2c_client *client,
 	int ret = 0;
 	struct pm80x_chip *chip;
 	struct pm80x_platform_data *pdata = dev_get_platdata(&client->dev);
+	struct device_node *np = client->dev.of_node;
 	struct pm80x_subchip *subchip;
 
+	if (!pdata && !np) {
+		dev_err(&client->dev,
+			"pm80x requires platform data or of_node\n");
+		return -EINVAL;
+	}
+
+	if (!pdata) {
+		pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+
+		/* Ensure we only alloc platform data once */
+		client->dev.platform_data = pdata;
+	}
+
 	ret = pm80x_init(client);
 	if (ret) {
 		dev_err(&client->dev, "pm800_init fail\n");
@@ -587,6 +612,7 @@ static struct i2c_driver pm800_driver = {
 		.name = "88PM800",
 		.owner = THIS_MODULE,
 		.pm = &pm80x_pm_ops,
+		.of_match_table	= pm80x_of_match_table,
 		},
 	.probe = pm800_probe,
 	.remove = pm800_remove,
-- 
1.9.1