On Thu, Sep 17, 2009 at 09:26:28PM +0900, jassi brar wrote:
/* Currently, WM8580 driver doesn't support PLL-out rates* other than those mentioned in Table-52 Page-58 of WM8580A
That very manual. And i don't say the WM8580 doesn't support, I said the WM8580 driver doesn't support: which can be verified looking at the CODEC driver.
Your comment says that only the output frequencies in table 52 are supported. Could you please provide more specific references to where this is done in the driver? I think you're confusing the fact that the example table lists most of the common audio frequencies with what the driver supports here.
Theoretically all output clocks are possible but usually the PLL coefficients have limits on their value and thus final output. WM8580 driver too seems to enforce that. Though, you wud know better of WM8580.
So what you're actually saying is that 256fs doesn't give us the option of an an in-range Fvco for the FLL at those frequencies (which is the check I think you're talking about here)? That's a limitation of the chip.
Certainly, the comment is not accurate - the contents of table 52 aren't relevant here, the driver is calculating what it can do dynamically so the restrictions are a combination of the limits on Fvco and the pre and post scaling dividers available.