[U-Boot] [PATCH] Exynos5: clock: Update the equation to calculate PLL output frequency

[Simon Glass]

On Fri, Mar 22, 2013 at 5:26 AM, Akshay Saraswat <akshay.s at samsung.com> wrote:
> According to the latest exynos5 user manual, the equation for
> calculating PLL output was changed to
> FOUT= MDIV x FIN/(PDIV x 2^SDIV)
> earlier it was
> FOUT= MDIV x FIN/(PDIV x 2^(SDIV -1))
> So updating the clock code accordingly.
>
> Signed-off-by: Hatim Ali <hatim.rv at samsung.com>
> Signed-off-by: Akshay Saraswat <akshay.s at samsung.com>

Acked-by: Simon Glass <sjg at chromium.org>

I think this is EVT1 silicon, right?

> ---
>  arch/arm/cpu/armv7/exynos/clock.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
> index 956427c..5299bc7 100644
> --- a/arch/arm/cpu/armv7/exynos/clock.c
> +++ b/arch/arm/cpu/armv7/exynos/clock.c
> @@ -73,10 +73,8 @@ static int exynos_get_pll_clk(int pllreg, unsigned int r, unsigned int k)
>                 /* FOUT = (MDIV + K / 1024) * FIN / (PDIV * 2^SDIV) */
>                 fout = (m + k / 1024) * (freq / (p * (1 << s)));
>         } else {
> -               if (s < 1)
> -                       s = 1;
> -               /* FOUT = MDIV * FIN / (PDIV * 2^(SDIV - 1)) */
> -               fout = m * (freq / (p * (1 << (s - 1))));
> +               /* FOUT = MDIV * FIN / (PDIV * 2^SDIV) */
> +               fout = m * (freq / (p * (1 << s)));
>         }
>
>         return fout;
> --
> 1.8.0
>