regulator: add device tree support for max8997
Add device tree based discovery support for max8997.
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/mfd/max8997.c b/drivers/mfd/max8997.c
index f1235170..abd5c80 100644
--- a/drivers/mfd/max8997.c
+++ b/drivers/mfd/max8997.c
@@ -21,8 +21,10 @@
* This driver is based on max8998.c
*/
+#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
+#include <linux/of_irq.h>
#include <linux/interrupt.h>
#include <linux/pm_runtime.h>
#include <linux/module.h>
@@ -47,6 +49,13 @@
{ .name = "max8997-led", .id = 2 },
};
+#ifdef CONFIG_OF
+static struct of_device_id __devinitdata max8997_pmic_dt_match[] = {
+ { .compatible = "maxim,max8997-pmic", .data = TYPE_MAX8997 },
+ {},
+};
+#endif
+
int max8997_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
{
struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
@@ -123,6 +132,58 @@
}
EXPORT_SYMBOL_GPL(max8997_update_reg);
+#ifdef CONFIG_OF
+/*
+ * Only the common platform data elements for max8997 are parsed here from the
+ * device tree. Other sub-modules of max8997 such as pmic, rtc and others have
+ * to parse their own platform data elements from device tree.
+ *
+ * The max8997 platform data structure is instantiated here and the drivers for
+ * the sub-modules need not instantiate another instance while parsing their
+ * platform data.
+ */
+static struct max8997_platform_data *max8997_i2c_parse_dt_pdata(
+ struct device *dev)
+{
+ struct max8997_platform_data *pd;
+
+ pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
+ if (!pd) {
+ dev_err(dev, "could not allocate memory for pdata\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ pd->ono = irq_of_parse_and_map(dev->of_node, 1);
+
+ /*
+ * ToDo: the 'wakeup' member in the platform data is more of a linux
+ * specfic information. Hence, there is no binding for that yet and
+ * not parsed here.
+ */
+
+ return pd;
+}
+#else
+static struct max8997_platform_data *max8997_i2c_parse_dt_pdata(
+ struct device *dev)
+{
+ return 0;
+}
+#endif
+
+static inline int max8997_i2c_get_driver_data(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+#ifdef CONFIG_OF
+ if (i2c->dev.of_node) {
+ const struct of_device_id *match;
+ match = of_match_node(max8997_pmic_dt_match, i2c->dev.of_node);
+ return (int)match->data;
+ }
+#endif
+ return (int)id->driver_data;
+}
+
static int max8997_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
@@ -137,12 +198,21 @@
i2c_set_clientdata(i2c, max8997);
max8997->dev = &i2c->dev;
max8997->i2c = i2c;
- max8997->type = id->driver_data;
+ max8997->type = max8997_i2c_get_driver_data(i2c, id);
max8997->irq = i2c->irq;
+ if (max8997->dev->of_node) {
+ pdata = max8997_i2c_parse_dt_pdata(max8997->dev);
+ if (IS_ERR(pdata)) {
+ ret = PTR_ERR(pdata);
+ goto err;
+ }
+ }
+
if (!pdata)
goto err;
+ max8997->pdata = pdata;
max8997->ono = pdata->ono;
mutex_init(&max8997->iolock);
@@ -434,6 +504,7 @@
.name = "max8997",
.owner = THIS_MODULE,
.pm = &max8997_pm,
+ .of_match_table = of_match_ptr(max8997_pmic_dt_match),
},
.probe = max8997_i2c_probe,
.remove = max8997_i2c_remove,