2015-07-30 13:10:48

by Axel Lin

Subject: regulator: Question about the buck_volt_range and MT6311_MAX_UV setting

Hi Henry,
Seems something wrong in either buck_volt_range or MT6311_MAX_UV setting.

.n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1
(1400000 - 600000) / 6250 + 1 = 129
So .n_voltages = 129.

>From the buck_volt_range:
The linear range has min_sel: 0, max_sel: 0x7f
(0 ~ 127, so 128 selector in this range)
And the max voltage is
600000 + 0x7f * 6250 = 1393750

I don't have the datasheet, so can you double check this?
Thank,
Axel

2015-07-31 01:12:35

by Henry Chen

Subject: Re: regulator: Question about the buck_volt_range and MT6311_MAX_UV setting

On Thu, 2015-07-30 at 21:10 +0800, Axel Lin wrote:

Hi Axel,

Oh..it was 1.4V on data sheet, but I think you're right, MT6311_MAX_UV
should be 1393750 was more precisely, I will change that.

Thanks.

> Hi Henry,
> Seems something wrong in either buck_volt_range or MT6311_MAX_UV setting.
>
> .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1
> (1400000 - 600000) / 6250 + 1 = 129
> So .n_voltages = 129.
>
> From the buck_volt_range:
> The linear range has min_sel: 0, max_sel: 0x7f
> (0 ~ 127, so 128 selector in this range)
> And the max voltage is
> 600000 + 0x7f * 6250 = 1393750
>
> I don't have the datasheet, so can you double check this?
> Thank,
> Axel
>
>