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authorRobert Jarzmik <robert.jarzmik@free.fr>2014-08-31 21:10:51 +0200
committerMark Brown <broonie@kernel.org>2014-09-01 11:35:45 +0100
commit4e00517945bed110f1b8de580cce97626e9ef0b5 (patch)
tree2e41f96205f21b06516db42f231298e7adcc6f71 /drivers/regulator
parent7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9 (diff)
downloadop-kernel-dev-4e00517945bed110f1b8de580cce97626e9ef0b5.zip
op-kernel-dev-4e00517945bed110f1b8de580cce97626e9ef0b5.tar.gz
regulator: max1586: add device-tree support
Add device-tree support to max1586. The driver can still be used with the legacy platform data, or the new device-tree way. This work is heavily inspired by the device-tree support of its cousin max8660 driver. Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/max1586.c81
1 files changed, 79 insertions, 2 deletions
diff --git a/drivers/regulator/max1586.c b/drivers/regulator/max1586.c
index d23d057..5c04a71 100644
--- a/drivers/regulator/max1586.c
+++ b/drivers/regulator/max1586.c
@@ -24,6 +24,8 @@
#include <linux/regulator/driver.h>
#include <linux/slab.h>
#include <linux/regulator/max1586.h>
+#include <linux/of_device.h>
+#include <linux/regulator/of_regulator.h>
#define MAX1586_V3_MAX_VSEL 31
#define MAX1586_V6_MAX_VSEL 3
@@ -157,13 +159,87 @@ static struct regulator_desc max1586_reg[] = {
},
};
+int of_get_max1586_platform_data(struct device *dev,
+ struct max1586_platform_data *pdata)
+{
+ struct max1586_subdev_data *sub;
+ struct of_regulator_match rmatch[ARRAY_SIZE(max1586_reg)];
+ struct device_node *np = dev->of_node;
+ int i, matched;
+
+ if (of_property_read_u32(np, "v3-gain",
+ &pdata->v3_gain) < 0) {
+ dev_err(dev, "%s has no 'v3-gain' property\n", np->full_name);
+ return -EINVAL;
+ }
+
+ np = of_get_child_by_name(np, "regulators");
+ if (!np) {
+ dev_err(dev, "missing 'regulators' subnode in DT\n");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(rmatch); i++)
+ rmatch[i].name = max1586_reg[i].name;
+
+ matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch));
+ of_node_put(np);
+ /*
+ * If matched is 0, ie. neither Output_V3 nor Output_V6 have been found,
+ * return 0, which signals the normal situation where no subregulator is
+ * available. This is normal because the max1586 doesn't provide any
+ * readback support, so the subregulators can't report any status
+ * anyway. If matched < 0, return the error.
+ */
+ if (matched <= 0)
+ return matched;
+
+ pdata->subdevs = devm_kzalloc(dev, sizeof(struct max1586_subdev_data) *
+ matched, GFP_KERNEL);
+ if (!pdata->subdevs)
+ return -ENOMEM;
+
+ pdata->num_subdevs = matched;
+ sub = pdata->subdevs;
+
+ for (i = 0; i < matched; i++) {
+ sub->id = i;
+ sub->name = rmatch[i].of_node->name;
+ sub->platform_data = rmatch[i].init_data;
+ sub++;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id max1586_of_match[] = {
+ { .compatible = "maxim,max1586", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, max1586_of_match);
+
static int max1586_pmic_probe(struct i2c_client *client,
const struct i2c_device_id *i2c_id)
{
- struct max1586_platform_data *pdata = dev_get_platdata(&client->dev);
+ struct max1586_platform_data *pdata, pdata_of;
struct regulator_config config = { };
struct max1586_data *max1586;
- int i, id;
+ int i, id, ret;
+ const struct of_device_id *match;
+
+ pdata = dev_get_platdata(&client->dev);
+ if (client->dev.of_node && !pdata) {
+ match = of_match_device(of_match_ptr(max1586_of_match),
+ &client->dev);
+ if (!match) {
+ dev_err(&client->dev, "Error: No device match found\n");
+ return -ENODEV;
+ }
+ ret = of_get_max1586_platform_data(&client->dev, &pdata_of);
+ if (ret < 0)
+ return ret;
+ pdata = &pdata_of;
+ }
max1586 = devm_kzalloc(&client->dev, sizeof(struct max1586_data),
GFP_KERNEL);
@@ -229,6 +305,7 @@ static struct i2c_driver max1586_pmic_driver = {
.driver = {
.name = "max1586",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(max1586_of_match),
},
.id_table = max1586_id,
};
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