This is based on reg and reg-names in DT.
Example:
reg = <0x10 0x20 0x30>;
reg-names = "main", "io", "test";
This function will create dummy devices io and test
with addresses 0x20 and 0x30 respectively.
Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois@xxxxxxxxxxx>
---
drivers/i2c/i2c-core.c | 20 ++++++++++++++++++++
include/linux/i2c.h | 6 ++++++
2 files changed, 26 insertions(+)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 632057a..5eb414d 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -798,6 +798,26 @@ struct i2c_client *i2c_new_dummy(struct i2c_adapter *adapter, u16 address)
}
EXPORT_SYMBOL_GPL(i2c_new_dummy);
+struct i2c_client *i2c_new_secondary_device(struct i2c_client *client,
+ const char *name,
+ u32 default_addr)
+{
+ int i, addr;
+ struct device_node *np;
+
+ np = client->dev.of_node;
+ i = of_property_match_string(np, "reg-names", name);
+ if (i >= 0)
+ of_property_read_u32_index(np, "reg", i, &addr);
+ else
+ addr = default_addr;
+
+ dev_dbg(&client->adapter->dev, "Address for %s : 0x%x\n", name, addr);
+ return i2c_new_dummy(client->adapter, addr);
+}
+EXPORT_SYMBOL_GPL(i2c_new_secondary_device);
+
+
/* ------------------------------------------------------------------------- */
/* I2C bus adapters -- one roots each I2C or SMBUS segment */
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index a95efeb..2d143d7 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -322,6 +322,12 @@ extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr);
extern struct i2c_client *
i2c_new_dummy(struct i2c_adapter *adap, u16 address);
+/* Use reg/reg-names in DT in order to get extra addresses */
+extern struct i2c_client *
+i2c_new_secondary_device(struct i2c_client *client,
+ const char *name,
+ u32 default_addr);
+
extern void i2c_unregister_device(struct i2c_client *);
#endif /* I2C */
--
2.0.4
--
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