dm: i2c: Add functions to read and write a register
Add driver model versions of the legacy functions to read and write a
single byte register. These are a useful shortcut in many cases.
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de>
diff --git a/include/i2c.h b/include/i2c.h
index 6fd73fa..d794057 100644
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -124,6 +124,27 @@
struct udevice **devp);
/**
+ * dm_i2c_reg_read() - Read a value from an I2C register
+ *
+ * This reads a single value from the given address in an I2C chip
+ *
+ * @addr: Address to read from
+ * @return value read, or -ve on error
+ */
+int dm_i2c_reg_read(struct udevice *dev, uint offset);
+
+/**
+ * dm_i2c_reg_write() - Write a value to an I2C register
+ *
+ * This writes a single value to the given address in an I2C chip
+ *
+ * @addr: Address to write to
+ * @val: Value to write (normally a byte)
+ * @return 0 on success, -ve on error
+ */
+int dm_i2c_reg_write(struct udevice *dev, uint offset, unsigned int val);
+
+/**
* dm_i2c_set_bus_speed() - set the speed of a bus
*
* @bus: Bus to adjust