[U-Boot] [U-Boot, 2/6] ARM: at91: clock: correct PRES offset for at91sam9x5

[Andreas Bießmann]

On Wed, Aug 17, 2016 at 09:13:24AM +0200, Heiko Schocher wrote:
> on at91sam9x5 PRES offset is 4 in the PMC master
> clock register.
> 
> Signed-off-by: Heiko Schocher <hs at denx.de>
> Acked-by: Wenyou Yang <wenyou.yang at atmel.com>

Acked-by: Andreas Bießmann <andreas at biessmann.org>

> ---
> 
>  arch/arm/mach-at91/arm926ejs/clock.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm/mach-at91/arm926ejs/clock.c b/arch/arm/mach-at91/arm926ejs/clock.c
> index c8d24ae..e3181fa 100644
> --- a/arch/arm/mach-at91/arm926ejs/clock.c
> +++ b/arch/arm/mach-at91/arm926ejs/clock.c
> @@ -162,7 +162,13 @@ int at91_clock_init(unsigned long main_clock)
>  	gd->arch.mck_rate_hz = at91_css_to_rate(mckr & AT91_PMC_MCKR_CSS_MASK);
>  	freq = gd->arch.mck_rate_hz;
>  
> +#if defined(CONFIG_AT91SAM9X5)
> +	/* different in prescale on at91sam9x5 */
> +	freq /= (1 << ((mckr & AT91_PMC_MCKR_PRES_MASK) >> 4));
> +#else
>  	freq /= (1 << ((mckr & AT91_PMC_MCKR_PRES_MASK) >> 2));	/* prescale */
> +#endif
> +
>  #if defined(CONFIG_AT91SAM9G20)
>  	/* mdiv ; (x >> 7) = ((x >> 8) * 2) */
>  	gd->arch.mck_rate_hz = (mckr & AT91_PMC_MCKR_MDIV_MASK) ?