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Date: Fri, 9 Sep 2011 17:47:48 -0700
From: Rhyland Klein <rklein@...dia.com>
To: Anton Vorontsov <cbouatmailru@...il.com>
Cc: linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
linux-arm-kernel@...ts.infradead.org,
Rhyland Klein <rklein@...dia.com>
Subject: [PATCH 1/2 v2] power: bq20z75: devicetree init support
Adding support to generate platform data when kernel is configured
through device tree.
Signed-off-by: Rhyland Klein <rklein@...dia.com>
---
v2: Fixed typo in binding description
drivers/power/bq20z75.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 73 insertions(+), 0 deletions(-)
diff --git a/drivers/power/bq20z75.c b/drivers/power/bq20z75.c
index 9c5e5be..922f725 100644
--- a/drivers/power/bq20z75.c
+++ b/drivers/power/bq20z75.c
@@ -613,6 +613,76 @@ static void bq20z75_delayed_work(struct work_struct *work)
}
}
+#if defined(CONFIG_OF)
+#include <linux/of_device.h>
+static const struct of_device_id bq20z75_dt_ids[] = {
+ { .compatible = "ti,bq20z75" },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, bq20z75_dt_ids);
+
+static struct bq20z75_platform_data *bq20z75_of_populate_pdata(
+ struct i2c_client *client)
+{
+ const struct of_device_id *dtid;
+ struct device_node *of_node = client->dev.of_node;
+ struct bq20z75_platform_data *pdata = client->dev.platform_data;
+ int rc;
+ u32 prop;
+
+ /* verify this driver matches this device */
+ dtid = of_match_device(bq20z75_dt_ids, &client->dev);
+ if (!dtid)
+ return NULL;
+
+ /* if platform data is set, honor it */
+ if (pdata)
+ return pdata;
+
+ /* first make sure at least one property is set, otherwise
+ * it won't change behavior from running without pdata.
+ */
+ if (!of_get_property(of_node, "i2c-retry-count", NULL) &&
+ !of_get_property(of_node, "poll-retry-count", NULL) &&
+ !of_get_property(of_node, "battery-detect", NULL) &&
+ !of_get_property(of_node, "battery-detect-present", NULL))
+ goto of_out;
+
+ pdata = devm_kzalloc(&client->dev, sizeof(struct bq20z75_platform_data),
+ GFP_KERNEL);
+ if (!pdata)
+ goto of_out;
+
+ rc = of_property_read_u32(of_node, "i2c-retry-count", &prop);
+ if (!rc)
+ pdata->i2c_retry_count = prop;
+
+ rc = of_property_read_u32(of_node, "battery-detect", &prop);
+ if (!rc)
+ pdata->battery_detect = prop;
+ else
+ pdata->battery_detect = -1; /*default is no gpio */
+
+ rc = of_property_read_u32(of_node, "battery-detect-present", &prop);
+ if (!rc)
+ pdata->battery_detect_present = prop;
+
+ rc = of_property_read_u32(of_node, "poll-retry-count", &prop);
+ if (!rc)
+ pdata->poll_retry_count = prop;
+
+of_out:
+ return pdata;
+}
+#else
+#define bq20z75_dt_ids NULL
+static struct bq20z75_platform_data *bq20z75_of_populate_pdata(
+ struct i2c_client *client)
+{
+ return NULL;
+}
+#endif
+
static int __devinit bq20z75_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -642,6 +712,8 @@ static int __devinit bq20z75_probe(struct i2c_client *client,
bq20z75_device->power_supply.external_power_changed =
bq20z75_external_power_changed;
+ pdata = bq20z75_of_populate_pdata(client);
+
if (pdata) {
bq20z75_device->gpio_detect =
gpio_is_valid(pdata->battery_detect);
@@ -775,6 +847,7 @@ static struct i2c_driver bq20z75_battery_driver = {
.id_table = bq20z75_id,
.driver = {
.name = "bq20z75-battery",
+ .of_match_table = bq20z75_dt_ids,
},
};
--
1.7.6
--
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