Re: [PATCH] ARM: tegra30: clocks: add AHB and APB clocks

[Prashant Gaikwad <pgaikwad-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>]

On Friday 19 October 2012 12:08 PM, Joseph Lo wrote:
> Adding the AHB and APB bus clock control interface for Tegra30.
>
> Signed-off-by: Joseph Lo<josephl-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> ---
>   arch/arm/mach-tegra/common.c              |    4 +
>   arch/arm/mach-tegra/tegra30_clocks.c      |  106 +++++++++++++++++++++++++++++
>   arch/arm/mach-tegra/tegra30_clocks.h      |    1 +
>   arch/arm/mach-tegra/tegra30_clocks_data.c |   46 +++++++++++++
>   4 files changed, 157 insertions(+), 0 deletions(-)

<snip>

> +
> +static long tegra30_bus_clk_round_rate(struct clk_hw *hw, unsigned long rate,
> +				unsigned long *prate)
> +{
> +	unsigned long parent_rate = *prate;
> +	s64 divider;
> +
> +	if (rate>= parent_rate)
> +		return rate;
> +

return parent_rate?

> +	divider = parent_rate;
> +	divider += rate - 1;
> +	do_div(divider, rate);
> +
> +	if (divider<  0)
> +		return divider;
> +
> +	if (divider>  4)
> +		divider = 4;
> +	do_div(parent_rate, divider);
> +
> +	return parent_rate;
> +}
>