On 12/10/2013 09:13 PM, Priyanka Jain wrote: > Single-source clocking is new feature introduced in T1040. > In this mode, a differential clock is supplied to the > DIFF_SYSCLK_P/N inputs to the processor, which in turn is > used to supply clocks to the sysclock, ddrclock and usbclock. > > So, both ddrclock and syclock are driven by same differential > sysclock in single-sourec clocking whereas in normal clocking > mode, generally separate DDRCLK and SYSCLK pins provides > reference clock for sysclock and ddrclock > > DDR_REFCLK_SEL rcw bit is used to determine DDR clock source > -If DDR_REFCLK_SEL rcw bit is 0, then DDR PLLs are driven in > normal clocking mode by DDR_Reference clock > > -If DDR_REFCLK_SEL rcw bit is 1, then DDR PLLs are driven in > single source clocking mode by DIFF_SYSCLK > > Add code to determine ddrclock based on DDR_REFCLK_SEL rcw bit. > > Signed-off-by: Poonam Aggrwal <poonam.aggr...@freescale.com> > Signed-off-by: Priyanka Jain <priyanka.j...@freescale.com> > --- > Changes for v2: > Incorporated York's comment to separate out > DDR_CLK_FREQ and SINGLE_SOURCE_CLK code > > arch/powerpc/cpu/mpc85xx/speed.c | 22 ++++++++++++++++++++-- > arch/powerpc/include/asm/config_mpc85xx.h | 1 + > arch/powerpc/include/asm/immap_85xx.h | 3 +++ > 3 files changed, 24 insertions(+), 2 deletions(-) > > diff --git a/arch/powerpc/cpu/mpc85xx/speed.c > b/arch/powerpc/cpu/mpc85xx/speed.c > index 46ae80c..ef52669 100644 > --- a/arch/powerpc/cpu/mpc85xx/speed.c > +++ b/arch/powerpc/cpu/mpc85xx/speed.c > @@ -76,10 +76,28 @@ void get_sys_info(sys_info_t *sys_info) > uint mem_pll_rat; > > sys_info->freq_systembus = sysclk; > +#ifdef CONFIG_SINGLE_SOURCE_CLK > + /* > + * DDR_REFCLK_SEL rcw bit is used to determine if DDR PLLS > + * are driven by separate DDR Refclock or single source > + * differential clock. > + */ > + uint single_src;
Sorry I missed this earlier. Please don't declare variables in the middle of a function. York _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot