[PATCH v2 06/19] i2c: designware_i2c: Use an accurate bus clock instead of MHz

[Heiko Schocher]

Hello Simon,

Am 03.01.2020 um 23:26 schrieb Simon Glass:
> At present the driver uses an approximation for the bus clock, e.g. 166MHz
> instead of 166 2/3 MHz.
> 
> This can result in small errors in the resulting I2C speed, perhaps 0.5%
> or so.
> 
> Adjust the existing code to start from the accurate figure, even if later
> rounding reduces this accuracy.
> 
> Update the bus speed code to work in KHz instead of MHz, which removes
> most of the error.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
> 
> Changes in v2: None
> 
>   drivers/i2c/designware_i2c.c | 18 ++++++++----------
>   drivers/i2c/designware_i2c.h |  4 ++--
>   2 files changed, 10 insertions(+), 12 deletions(-)

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

bye,
Heiko
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