[U-Boot] [PATCH v2 1/3] Tegra: I2C: Add T114 clock support to tegra_i2c driver

Laxman Dewangan ldewangan at nvidia.com
Fri Feb 8 10:15:59 CET 2013


On Thursday 07 February 2013 04:56 AM, Tom Warren wrote:
> T114 has a slightly different I2C clock, with a new divisor for
> standard/fast mode and HS mode. Tested on my Dalmore, and the I2C
> clock is 100KHz +/- 3% on my Saleae Logic analyzer.
>
> Signed-off-by: Tom Warren <twarren at nvidia.com>
> ---
> v2: new

>   	 */
>   	clock_start_periph_pll(i2c_bus->periph_id, CLOCK_ID_PERIPH,
> -			       i2c_bus->speed * 2 * 8);
> +		i2c_bus->speed * 2 * 8);

I think you do not need to multipled by 2 again here. *2 can be remove.
I2C clock divder is U16 type.


>

> +
> +	clock_start_periph_pll(i2c_bus->periph_id, CLOCK_ID_PERIPH,
> +		CLK_MULT_STD_FAST_MODE * (clk_div_std_fast_mode+1) *
> +		i2c_bus->speed * 2);

Same as above, *2 is not required.


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