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31 March, 2024

There are two solutions for one board, using different chips. But one of their i2c address is the same. How to resolve conflict in one dts?

 Programing Coderfunda     March 31, 2024     No comments   

Two chips A and B conflict with 0x62 on i2c bus 10. If A@62 and B@62 are configured on dts, Linux loads the driver of A. If B@62 is in front, it will load the driver of B. Whoever is in front will Which driver will be loaded, and is there any way to make the two chips compatible in one DTS.


i2cdetect -r -y 10
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- UU -- UU -- UU -- UU --
60: UU -- UU -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --


i2cdetect -r -y 9
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- 0c -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- 28 -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- 37 -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- UU 62 UU -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- UU -- UU UU -- --


Hardware can't modify the address. If two dts are used, there will be two firmwares, which is inconvenient.
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