genirq: Add the generic chip to the genirq docbook

Signed-off-by: Thomas Gleixner <[e-mail]>
Cc: Randy Dunlap <[e-mail]>

Documentation/DocBook/genericirq.tmpl

···
 	protected via desc->lock, by the generic layer.
      </para>
   </chapter>
+
+  <chapter id="genericchip">
+     <title>Generic interrupt chip</title>
+     <para>
+       To avoid copies of identical implementations of irq chips the
+       core provides a configurable generic interrupt chip
+       implementation. Developers should check carefuly whether the
+       generic chip fits their needs before implementing the same
+       functionality slightly different themself.
+     </para>
+!Ekernel/irq/generic-chip.c
+  </chapter>
+
   <chapter id="structs">
      <title>Structures</title>
      <para>

kernel/irq/generic-chip.c

···
 }
 
 /**
- * irq_gc_mask_set_mask_bit - Mask chip via setting bit in mask register
+ * irq_gc_mask_set_bit - Mask chip via setting bit in mask register
  * @d: irq_data
  *
  * Chip has a single mask register. Values of this register are cached
···
 EXPORT_SYMBOL_GPL(irq_gc_mask_set_bit);
 
 /**
- * irq_gc_mask_set_mask_bit - Mask chip via clearing bit in mask register
+ * irq_gc_mask_clr_bit - Mask chip via clearing bit in mask register
  * @d: irq_data
  *
  * Chip has a single mask register. Values of this register are cached
···
 
 /**
  * irq_gc_set_wake - Set/clr wake bit for an interrupt
- * @d: irq_data
+ * @d:  irq_data
+ * @on: Indicates whether the wake bit should be set or cleared
  *
  * For chips where the wake from suspend functionality is not
  * configured in a separate register and the wakeup active state is
···
  */
 static struct lock_class_key irq_nested_lock_class;
 
-/**
+/*
  * irq_map_generic_chip - Map a generic chip for an irq domain
  */
 static int irq_map_generic_chip(struct irq_domain *d, unsigned int virq,
···
 /**
  * irq_setup_alt_chip - Switch to alternative chip
  * @d:		irq_data for this interrupt
- * @type	Flow type to be initialized
+ * @type:	Flow type to be initialized
  *
  * Only to be called from chip->irq_set_type() callbacks.
  */