[alsa-devel] [PATCH] ASoC: ssm2602: Fix ADC powerup sequencing

[Marco Felsch]

Hi Mark,

On 18-05-25 11:26, Mark Brown wrote:
> On Fri, May 25, 2018 at 11:47:24AM +0200, Marco Felsch wrote:
> 
> > I found the: "ti,charge-period (sound/ti,tas5086.txt)" binding which
> > represents nearly the same but it is not common. One opportunity would be to
> > introduce a common "charge-period-us" binding and change the ti binding the
> > common binding later.
> 
> Are you sure what you have is a charge period and not some stabalization
> time or something?

According to the data sheet:
8<-----
As described in the Digital Core Clock section of the
Theory of Operation, insert enough delay time to charge
the VMID decoupling capacitor before setting the active
bit [Register R9, Bit D0].
8<-----
I think yes, it is a charge period.

Also the formula for the delay time (t = C × 25,000/3.5) depends only on
the capacity size.

Marco