[Letux-kernel] mcbsp 4

[Andreas Kemnade]

Hi,

On Fri, 28 Apr 2017 08:44:04 +0200
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:


> 
> Essentially the same task could be to find out why the Si4721 is not working any more.
> 
> It responds a little to I2C commands but not reliably. Maybe, it is missing the McBSP1
> clock for some operations.
> 
Well, it has several clocks (I2C clock, 32khz clock and the I2S clocks).
I remember being reliably able to tune to a station without mcbsp set
up. only for the command which actually enables the i2s interface, the
mcbsp clocks are required.

So I think the other clocks are more interesting at first. The 32khz
stuff: hmm. the also not-so-stable bluetooth has that also...
But it should be rarely switched off.
Hmm, I2C. maybe frequency too high for the si4721. Or it does some
clock stretching the master is not properly acting upon.

Regards,
Andreas
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