[U-Boot] [PATCH 1/7] rockchip: rk3399: update PPLL and pmu_pclk frequency

[Kever Yang]

Hi Simon,

On 09/06/2016 09:03 AM, Simon Glass wrote:
> Hi Kever,
>
> On 29 August 2016 at 21:02, Kever Yang <kever.yang at rock-chips.com> wrote:
>> This patch update PPLL to 676MHz and PMU_PCLK to 48MHz.
> Why?
>

1. 48MHz can make sure the pwm can get exact 50% duty ratio, but 99MHz 
can not,
2. We think 48MHz is fast enough for pmu pclk and it is lower power cost 
than 99MHz,
3. PPLL 676 MHz and PMU_PCLK 48MHz are the clock rate we are using 
internally for kernel,
it suppose not to change the bus clock like pmu_pclk in kernel, so we 
want to change it in uboot.

Thanks,
- Kever
>> Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
>> ---
>>
>>   arch/arm/include/asm/arch-rockchip/cru_rk3399.h | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm/include/asm/arch-rockchip/cru_rk3399.h b/arch/arm/include/asm/arch-rockchip/cru_rk3399.h
>> index c919f47..6776e48 100644
>> --- a/arch/arm/include/asm/arch-rockchip/cru_rk3399.h
>> +++ b/arch/arm/include/asm/arch-rockchip/cru_rk3399.h
>> @@ -64,9 +64,9 @@ check_member(rk3399_cru, sdio1_con[1], 0x594);
>>   #define APLL_HZ                (600*MHz)
>>   #define GPLL_HZ                (594*MHz)
>>   #define CPLL_HZ                (384*MHz)
>> -#define PPLL_HZ                (594*MHz)
>> +#define PPLL_HZ                (676*MHz)
>>
>> -#define PMU_PCLK_HZ    (99*MHz)
>> +#define PMU_PCLK_HZ    (48*MHz)
>>
>>   #define ACLKM_CORE_HZ  (300*MHz)
>>   #define ATCLK_CORE_HZ  (300*MHz)
>> --
>> 1.9.1
>>
> Regards,
> Simon
>
>
>