U-Boot with I2C_DM enabled is not capable to list i2c busses connected to i2c mux. For getting this work there is a need to find out highest alias ID and use this uniq number for new buses connected to I2C mux. This series is making this happen.
There is only one missing piece which is that also i2c controllers which are not listed in DT are not using this feature.
Removing setting up aliases from i2c mux code and unifying it in the same code ensures that numbering schema is proper if no alias is specified.
ZynqMP> i2c bus Bus 0: i2c@ff020000 20: gpio@20, offset len 1, flags 0 21: gpio@21, offset len 1, flags 0 75: i2c-mux@75, offset len 1, flags 0 Bus 1: i2c@ff020000->i2c-mux@75->i2c@0 Bus 2: i2c@ff020000->i2c-mux@75->i2c@1 Bus 3: i2c@ff020000->i2c-mux@75->i2c@2 Bus 4: i2c@ff030000 (active 4) 74: i2c-mux@74, offset len 1, flags 0 75: i2c-mux@75, offset len 1, flags 0 Bus 5: i2c@ff030000->i2c-mux@74->i2c@0 (active 5) 54: eeprom@54, offset len 1, flags 0 Bus 6: i2c@ff030000->i2c-mux@74->i2c@1 Bus 7: i2c@ff030000->i2c-mux@74->i2c@2 Bus 8: i2c@ff030000->i2c-mux@74->i2c@3 Bus 9: i2c@ff030000->i2c-mux@74->i2c@4 Bus 10: i2c@ff030000->i2c-mux@75->i2c@0 Bus 11: i2c@ff030000->i2c-mux@75->i2c@1 Bus 12: i2c@ff030000->i2c-mux@75->i2c@2 Bus 13: i2c@ff030000->i2c-mux@75->i2c@3 Bus 14: i2c@ff030000->i2c-mux@75->i2c@4 Bus 15: i2c@ff030000->i2c-mux@75->i2c@5 Bus 16: i2c@ff030000->i2c-mux@75->i2c@6 Bus 17: i2c@ff030000->i2c-mux@75->i2c@7
Thanks, Michal
Changes in v2: - Update kernel-doc binding - Return -1 in case of error. -1 means that the next free alias is 0. - New patch - New patch - Use dev_read_alias_highest_id() - Use uclass private data - Use private uclass data - Fix headers - Change patch description to focus only on bus name
Michal Simek (7): dm: core: Add of_alias_get_highest_id() fdt: Introduce fdtdec_get_alias_highest_id() dm: core: Introduce dev_read_alias_highest_id() dm: core: Add tests for dev_read_alias_highest_id() i2c: dm: Record maximum id of devices before probing devices i2c: Fill req_seq in i2c_post_bind() i2c: mux: Generate longer i2c mux name
drivers/core/of_access.c | 18 ++++++++++++++ drivers/core/read.c | 8 ++++++ drivers/i2c/i2c-uclass.c | 50 +++++++++++++++++++++++++++++++++++--- drivers/i2c/muxes/i2c-mux-uclass.c | 29 +++++++++++++++++++--- include/dm/of_access.h | 10 ++++++++ include/dm/read.h | 16 ++++++++++++ include/fdtdec.h | 13 ++++++++++ lib/fdtdec.c | 33 +++++++++++++++++++++++++ test/dm/test-fdt.c | 23 ++++++++++++++++++ 9 files changed, 194 insertions(+), 6 deletions(-)