mfd: max8998: Add support for Device Tree
This patch adds Device Tree support to max8998 driver.
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/max8998.c b/drivers/mfd/max8998.c
index d7218cc..21af51a 100644
--- a/drivers/mfd/max8998.c
+++ b/drivers/mfd/max8998.c
@@ -20,12 +20,15 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/err.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
#include <linux/pm_runtime.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
@@ -128,6 +131,56 @@
}
EXPORT_SYMBOL(max8998_update_reg);
+#ifdef CONFIG_OF
+static struct of_device_id max8998_dt_match[] = {
+ { .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
+ { .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
+ { .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
+ {},
+};
+MODULE_DEVICE_TABLE(of, max8998_dt_match);
+#endif
+
+/*
+ * Only the common platform data elements for max8998 are parsed here from the
+ * device tree. Other sub-modules of max8998 such as pmic, rtc and others have
+ * to parse their own platform data elements from device tree.
+ *
+ * The max8998 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 max8998_platform_data *max8998_i2c_parse_dt_pdata(
+ struct device *dev)
+{
+ struct max8998_platform_data *pd;
+
+ pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
+ if (!pd)
+ 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;
+}
+
+static inline int max8998_i2c_get_driver_data(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
+ const struct of_device_id *match;
+ match = of_match_node(max8998_dt_match, i2c->dev.of_node);
+ return (int)match->data;
+ }
+
+ return (int)id->driver_data;
+}
+
static int max8998_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
@@ -139,11 +192,20 @@
if (max8998 == NULL)
return -ENOMEM;
+ if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
+ pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
+ if (IS_ERR(pdata)) {
+ ret = PTR_ERR(pdata);
+ goto err;
+ }
+ }
+
i2c_set_clientdata(i2c, max8998);
max8998->dev = &i2c->dev;
max8998->i2c = i2c;
max8998->irq = i2c->irq;
- max8998->type = id->driver_data;
+ max8998->type = max8998_i2c_get_driver_data(i2c, id);
+ max8998->pdata = pdata;
if (pdata) {
max8998->ono = pdata->ono;
max8998->irq_base = pdata->irq_base;
@@ -158,7 +220,7 @@
pm_runtime_set_active(max8998->dev);
- switch (id->driver_data) {
+ switch (max8998->type) {
case TYPE_LP3974:
ret = mfd_add_devices(max8998->dev, -1,
lp3974_devs, ARRAY_SIZE(lp3974_devs),
@@ -314,6 +376,7 @@
.name = "max8998",
.owner = THIS_MODULE,
.pm = &max8998_pm,
+ .of_match_table = of_match_ptr(max8998_dt_match),
},
.probe = max8998_i2c_probe,
.remove = max8998_i2c_remove,