* regulator: Question about the buck_volt_range and MT6311_MAX_UV setting
@ 2015-07-30 13:10 Axel Lin
2015-07-31 1:12 ` Henry Chen
0 siblings, 1 reply; 2+ messages in thread
From: Axel Lin @ 2015-07-30 13:10 UTC (permalink / raw)
To: Henry Chen
Cc: Mark Brown, Javier Martinez Canillas, Liam Girdwood, linux-kernel
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: regulator: Question about the buck_volt_range and MT6311_MAX_UV setting
2015-07-30 13:10 regulator: Question about the buck_volt_range and MT6311_MAX_UV setting Axel Lin
@ 2015-07-31 1:12 ` Henry Chen
0 siblings, 0 replies; 2+ messages in thread
From: Henry Chen @ 2015-07-31 1:12 UTC (permalink / raw)
To: Axel Lin
Cc: Mark Brown, Javier Martinez Canillas, Liam Girdwood, linux-kernel
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
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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