[PATCH v2] i2c: rk3x: fix bug that cause measured high_ns doesn't meet I2C spec

[wsa@the-dreams.de (Wolfram Sang)]

> + - rise-ns : Number of nanoseconds the signal takes to rise (t(r) in i2c spec).
> +	     If not specified this is assumed to be the max the spec allows
> +	     (1000 ns for standard mode, 300 ns for fast mode) which might
> +	     cause slightly slower communication.
> + - fall-ns : Number of nanoseconds the signal takes to fall (t(f) in the i2c0
> +	     spec).  If not specified this is assumed to be the max the spec
> +	     allows (300 ns) which might cause slightly slower communication.

We already have those bindings from the designware driver:

 - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds.
 - i2c-scl-falling-time : should contain the SCL falling time in nanoseconds.
 - i2c-sda-falling-time : should contain the SDA falling time in nanoseconds.

Can you reuse them? Or do you really need a specific rise-time property?
If so, please matche the style of the bindings above.

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