[U-Boot] [PATCH] arm: pxa: config option for PXA270 turbo mode

[Marek Vasut]

Dear Sergey Yanovich,

> PXA270 CPU has turbo mode. The mode is 2.5 times faster than the
> default run mode. Activating the mode early significantly speeds
> up boot process.
> 
> Signed-off-by: Sergey Yanovich <ynvich at gmail.com>

What's the difference? Where does this macro get used ?

> ---
>  arch/arm/cpu/pxa/pxa2xx.c |    7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/cpu/pxa/pxa2xx.c b/arch/arm/cpu/pxa/pxa2xx.c
> index 09e8177..6c918ac 100644
> --- a/arch/arm/cpu/pxa/pxa2xx.c
> +++ b/arch/arm/cpu/pxa/pxa2xx.c
> @@ -32,6 +32,10 @@
>  #include <common.h>
>  #include <asm/arch/pxa-regs.h>
> 
> +#ifndef CONFIG_SYS_CLKCFG
> +#define CONFIG_SYS_CLKCFG	0x00000002
> +#endif
> +
>  /* Flush I/D-cache */
>  static void cache_flush(void)
>  {
> @@ -244,7 +248,8 @@ void pxa_clock_setup(void)
>  {
>  	writel(CONFIG_SYS_CKEN, CKEN);
>  	writel(CONFIG_SYS_CCCR, CCCR);
> -	asm volatile("mcr	p14, 0, %0, c6, c0, 0" : : "r"(2));
> +	asm volatile("mcr	p14, 0, %0, c6, c0, 0" : :
> +			"r"(CONFIG_SYS_CLKCFG));
> 
>  	/* enable the 32Khz oscillator for RTC and PowerManager */
>  	writel(OSCC_OON, OSCC);

Best regards,
Marek Vasut