quoted

+void sp_intc_set_ext(u32 hwirq, int ext_num)
+{
+	sp_intc_assign_bit(hwirq, REG_INTR_PRIORITY, !ext_num);
+}
+EXPORT_SYMBOL_GPL(sp_intc_set_ext);

No way. We don't export random symbols without a good justification,
and you didn't give any.

This function called by SP7021 display driver to decide DISPLAY_IRQ
routing to which parent irq (EXT_INT0 or EXT_INT1).

In previous patches, which defined in DT, parsed & processed @ sp_intc_xlate_of()
From your comment, this is a SW decision. So I removed it from DT & intc driver, only 
export this function to access the related intc reg.

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