* @id_mask: bits valid in CHIPID register for comparison with id_val
* @num_gpios: number of GPIOS
* @af_bits: number of bits used to specify the alternate function
+ * @regs: variant specific registers.
* @blocks: list of blocks present on this device
* @num_blocks: number of blocks present on this device
* @num_irqs: number of internal IRQs available on this device