SANTINO(-LT): Switch display clock to PLL2 to enable spread spectrum
On the i.MX6, only PLL2 supports SSC (spread spectrum clocking), the other 6 PLLs do not support SSC. At the moment, SCC is not active for the display clock on SANTINO(-LT), because the clock is derived from PLL3 (instead of PLL2).
The patches update clock initialization on i.MX6 platform to check:
- device-tree to identify systems with parallel LCD-interface
- presence of enabled spread-spectrum settings in device-tree
If both conditions are met, clock driver switches IPU1 to PLL2 to allow spread-spectrum clocking of parallel LCD-displays
Issue-Id: 746-001441