Baldur's Gate : The Sword Coast Chronicles : NWN2 Persistent World

Does anyone know if the Divine Spell Power feat (description below) will raise your caster level for all caster classes that you may have (for example, a multiclass cleric mage or cleric spirit shaman, etc) or just for the cleric class?

Thanks

Divine Spellpower:

Expend 1 turn undead use and roll a turning check with a +3 bonus. You add +X to your CL for the next divine spell cast in the same round, where X is:

Roll of 0-: -4
Roll of 1+: -3
Roll of 4+: -2
Roll of 7+: -1
Roll of 10+: 0
Roll of 13+: +1
Roll of 16+: +2
Roll of 19+: +3
Roll of 22+: +4

Only the divine class that granted you Turn Undead to qualify. A while back when I was in QC I tested a build for another player which was a DC druid/cler/hierophant and (Advanced) Divine Spell Power did not increase the druid's caster level, only the cleric class.

Thank you.