[SPAM] Re[2]: [PATCH 03/11] ARM: clps711x: Adds config option for CPU PLL multiplier

[Jean-Christophe PLAGNIOL-VILLARD]

On 15:58 Fri 08 Feb     , Alexander Shiyan wrote:
> Hello.
> 
> ...
> > > +menu "CLPS711X specific settings"
> > > +
> > > +config CLPS711X_CPU_PLL_MULT
> > > +	int "CPU PLL multiplier (20-50)"
> > > +	range 20 50
> > > +	default "40"
> > > +	help
> > > +	  Define CPU PLL multiplier. PLL is calculated by formula:
> > > +	    PLL Frequency = (PLL Multiplier / 2) * 3686400 Hz
> > > +	  Default value is 40, for achieve 73 MHz.
> > > +
> > this board specific put this in c code
> > kconfig is too easy to break
> > 
> > check how we do on at91
> 
> This is not board-specific, this is CPU-specific. PLL multiplier is set up
> at the start and we not touch it anymore since all system frequencies is
> depends on it, including SDRAM refresh.
> How to place this configurable parameter in C code i am not understand.
> For Kconfig, we can add additional compile-time checker into lowlevel unit
> which uses this symbol:
> 
> #if (CLPS711X_CPU_PLL_MULT < 20) || (CLPS711X_CPU_PLL_MULT > 50)
> #error "CPU PLL multiplier out of range"
> #endif
so it's even worse

detect the cpu in c and dorp the Kconfig

Best Regards,
J.
> 
> Thanks!
> 
> ---