Hi Wolfram, ? 2016/4/15 2:48, Wolfram Sang ??: >> + - input-clk-rate : frequency rate of function clock used(in Hz). If omitted, >> + the default clock rate is used. It is just used at rk3399 soc. > Why is this needed? Why don't we simply use the default or calculate the > best value somehow? 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. >> + * @t_calc: Caculated rk3x private timings that would >> + * be written into regs > double space >
