ARM: imx6: clocks: remove function local definitions of mxc_ccm_reg and anatop_regs

[karo-tx-uboot.git] / include / i2c.h

diff --git a/include/i2c.h b/include/i2c.h
index d19182931c57a328981721ceaf8dbf8edabeb998..6493931c3539daac140518146974ee49e83ca1ff 100644 (file)
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -444,6 +444,45 @@ struct dm_i2c_ops {
 
 #define i2c_get_ops(dev)       ((struct dm_i2c_ops *)(dev)->driver->ops)
 
+/**
+ * struct i2c_mux_ops - operations for an I2C mux
+ *
+ * The current mux state is expected to be stored in the mux itself since
+ * it is the only thing that knows how to make things work. The mux can
+ * record the current state and then avoid switching unless it is necessary.
+ * So select() can be skipped if the mux is already in the correct state.
+ * Also deselect() can be made a nop if required.
+ */
+struct i2c_mux_ops {
+       /**
+        * select() - select one of of I2C buses attached to a mux
+        *
+        * This will be called when there is no bus currently selected by the
+        * mux. This method does not need to deselect the old bus since
+        * deselect() will be already have been called if necessary.
+        *
+        * @mux:        Mux device
+        * @bus:        I2C bus to select
+        * @channel:    Channel number correponding to the bus to select
+        * @return 0 if OK, -ve on error
+        */
+       int (*select)(struct udevice *mux, struct udevice *bus, uint channel);
+
+       /**
+        * deselect() - select one of of I2C buses attached to a mux
+        *
+        * This is used to deselect the currently selected I2C bus.
+        *
+        * @mux:        Mux device
+        * @bus:        I2C bus to deselect
+        * @channel:    Channel number correponding to the bus to deselect
+        * @return 0 if OK, -ve on error
+        */
+       int (*deselect)(struct udevice *mux, struct udevice *bus, uint channel);
+};
+
+#define i2c_mux_get_ops(dev)   ((struct i2c_mux_ops *)(dev)->driver->ops)
+
 /**
  * i2c_get_chip() - get a device to use to access a chip on a bus
  *