[PATCH v5 08/10] irqchip: Add Sunplus SP7021 interrupt controller driver

[qinjian[覃健]]

> > +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.