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mfd: max8998: Add support for Device Tree

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This patch adds Device Tree support to max8998 driver.

Signed-off-by: Tomasz Figa <[email protected]>
Acked-by: Mark Brown <[email protected]>
Signed-off-by: Samuel Ortiz <[email protected]>
This commit is contained in:
Tomasz Figa 2013-06-25 16:08:10 +02:00 • committed by Samuel Ortiz
commit ee999fb3f1
6 changed files with 316 additions and 7 deletions
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67
drivers/mfd/max8998.c
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@ -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 @@ int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
}
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 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
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 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
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 @@ static struct i2c_driver max8998_i2c_driver = {
.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,