[PATCH v5 2/2] i2c: rk3x: add i2c support for rk3399 soc
david.wu at rock-chips.com
Mon Apr 18 06:15:46 PDT 2016
在 2016/4/16 1:58, Wolfram Sang 写道:
>> The default frequency rate of function clock is 50M Hz, it can match
>> F/S mode, but HS mode not. If use default rate 50M to get 1.7M
>> scl-frequency rate , we could not get accurately 1.7M frequecy rate.
>> The input-clk-rate is more higher, we get more accurately
>> scl-frequency rate, as 200M is a suitable input-clk-rate.
>> If 200M was used for F/S mode, it would increase power consumption, so
>> add a option that could be configured from DT.
> If I understand you correctly, couldn't you use clk_set_rate() depending
> on the desired scl frequency which is already described in DT as
Yeap, the default input clock rate is too low for HS mode, and it 's
we get it from DT.
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