[PATCH v2 6/7] mfd: max77620: Support device-tree properly

[Dmitry Osipenko]

For some unknown reason the driver for Max77620 doesn't wire up the
device-tree support properly and nothing in kernel creates I2C device
for the driver (and never did), moreover device-tree files for NVIDIA
Tegra210/186/194 boards already have nodes for Max77620. Hence add the
missing of_match_table to make driver actually usable.

Signed-off-by: Dmitry Osipenko <dig...@gmail.com>
---
 drivers/mfd/max77620.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/mfd/max77620.c b/drivers/mfd/max77620.c
index 9b0009c29610..b7a058069808 100644
--- a/drivers/mfd/max77620.c
+++ b/drivers/mfd/max77620.c
@@ -37,6 +37,10 @@
 #include <linux/regmap.h>
 #include <linux/slab.h>
 
+struct max77620_desc {
+       enum max77620_chip_id chip_id;
+};
+
 static const struct resource gpio_resources[] = {
        DEFINE_RES_IRQ(MAX77620_IRQ_TOP_GPIO),
 };
@@ -487,6 +491,7 @@ static int max77620_probe(struct i2c_client *client,
        const struct regmap_config *rmap_config;
        struct max77620_chip *chip;
        const struct mfd_cell *mfd_cells;
+       const struct max77620_desc *desc;
        int n_mfd_cells;
        int ret;
 
@@ -500,6 +505,10 @@ static int max77620_probe(struct i2c_client *client,
        chip->chip_irq = client->irq;
        chip->chip_id = (enum max77620_chip_id)id->driver_data;
 
+       desc = of_device_get_match_data(&client->dev);
+       if (desc)
+               chip->chip_id = desc->chip_id;
+
        switch (chip->chip_id) {
        case MAX77620:
                mfd_cells = max77620_children;
@@ -673,6 +682,25 @@ static const struct i2c_device_id max77620_id[] = {
        {},
 };
 
+static const struct max77620_desc max77620_desc = {
+       .chip_id = MAX77620,
+};
+
+static const struct max77620_desc max20024_desc = {
+       .chip_id = MAX20024,
+};
+
+static const struct max77620_desc max77663_desc = {
+       .chip_id = MAX77663,
+};
+
+static const struct of_device_id max77620_of_match[] = {
+       { .compatible = "maxim,max77620", .data = &max77620_desc },
+       { .compatible = "maxim,max20024", .data = &max20024_desc },
+       { .compatible = "maxim,max77663", .data = &max77663_desc },
+       { },
+};
+
 static const struct dev_pm_ops max77620_pm_ops = {
        SET_SYSTEM_SLEEP_PM_OPS(max77620_i2c_suspend, max77620_i2c_resume)
 };
@@ -681,6 +709,7 @@ static struct i2c_driver max77620_driver = {
        .driver = {
                .name = "max77620",
                .pm = &max77620_pm_ops,
+               .of_match_table = of_match_ptr(max77620_of_match),
        },
        .probe = max77620_probe,
        .id_table = max77620_id,
-- 
2.21.0