[PATCH v2 11/19] i2c: designware_i2c: Rewrite timing calculation

[Heiko Schocher]

Hello Simon,

Am 03.01.2020 um 23:26 schrieb Simon Glass:
> At present the driver can end up with timing parameters which are slightly
> faster than those expected. It is possible to optimise the parameters to
> get the best possible result.
> 
> Create a new function to handle the timing calculation. This uses a table
> of defaults for each speed mode rather than writing it in code.
> 
> The function works by calculating the 'period' of each bit on the bus in
> terms of the input clock to the controller (IC_CLK). It makes sure that
> the constraints are met and that the different components of that period
> add up correctly.
> 
> This code was taken from coreboot which has ended up with this same
> driver, but now in a much-different form.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
> 
> Changes in v2: None
> 
>   drivers/i2c/designware_i2c.c | 169 ++++++++++++++++++++++++++++++-----
>   1 file changed, 147 insertions(+), 22 deletions(-)

Reviewed-by: Heiko Schocher <hs at denx.de>

bye,
Heiko
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