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authorBen Warren <bwarren@qstreams.com>2006-09-07 16:50:54 -0400
committerKim Phillips <kim.phillips@freescale.com>2006-11-03 19:42:19 -0600
commitbb99ad6d8257bf828f150d40f507b30d80a4a7ae (patch)
treeb097750e9e63f49186717a1eb4fcd078f65ae381 /include/i2c.h
parentbed85caf872714ebf53013967a695c9d63acfc68 (diff)
downloadu-boot-linaro-stable-bb99ad6d8257bf828f150d40f507b30d80a4a7ae.tar.gz
Add support for multiple I2C buses
Hello, Attached is a patch providing support for multiple I2C buses at the command level. The second part of the patch includes an implementation for the MPC834x CPU and MPC8349EMDS board. /*** Note: This patch replaces ticket DNX#2006083042000018 ***/ Signed-off-by: Ben Warren <bwarren@qstreams.com> Overview: 1. Include new 'i2c' command (based on USB implementation) using CONFIG_I2C_CMD_TREE. 2. Allow multiple buses by defining CONFIG_I2C_MULTI_BUS. Note that the commands to change bus number and speed are only available under the new 'i2c' command mentioned in the first bullet. 3. The option CFG_I2C_NOPROBES has been expanded to work in multi-bus systems. When CONFIG_I2C_MULTI_BUS is used, this option takes the form of an array of bus-device pairs. Otherwise, it is an array of uchar. CHANGELOG: Added new 'i2c' master command for all I2C interaction. This is conditionally compiled with CONFIG_I2C_CMD_TREE. New commands added for setting I2C bus speed as well as changing the active bus if the board has more than one (conditionally compiled with CONFIG_I2C_MULTI_BUS). Updated NOPROBE logic to handle multiple buses. Updated README. regards, Ben
Diffstat (limited to 'include/i2c.h')
-rw-r--r--include/i2c.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/include/i2c.h b/include/i2c.h
index 6d39080d8..97e006163 100644
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -82,4 +82,49 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len);
uchar i2c_reg_read (uchar chip, uchar reg);
void i2c_reg_write(uchar chip, uchar reg, uchar val);
+/*
+ * Functions for setting the current I2C bus and its speed
+ */
+
+/*
+ * i2c_set_bus_num:
+ *
+ * Change the active I2C bus. Subsequent read/write calls will
+ * go to this one.
+ *
+ * bus - bus index, zero based
+ *
+ * Returns: 0 on success, not 0 on failure
+ *
+ */
+int i2c_set_bus_num(uchar bus);
+
+/*
+ * i2c_get_bus_num:
+ *
+ * Returns index of currently active I2C bus. Zero-based.
+ */
+
+uchar i2c_get_bus_num(void);
+
+/*
+ * i2c_set_bus_speed:
+ *
+ * Change the speed of the active I2C bus
+ *
+ * speed - bus speed in Hz
+ *
+ * Returns: 0 on success, not 0 on failure
+ *
+ */
+int i2c_set_bus_speed(int);
+
+/*
+ * i2c_get_bus_speed:
+ *
+ * Returns speed of currently active I2C bus in Hz
+ */
+
+int i2c_get_bus_speed(void);
+
#endif /* _I2C_H_ */