irqchip: omap-intc: Fix support for dm814 and dm816

On dm81xx we have 128 interrupts like am33xx has. Let's add
compatible flags for dm814x and dm816x, and document the
existing binding.

As the dm81xx are booting in device tree only mode, we can now
also remove ti81xx_init_irq() legacy function.

Signed-off-by: Tony Lindgren <[e-mail]>
Reviewed-by: Felipe Balbi <[e-mail]>
Cc: Brian Hutchinson <[e-mail]>
Cc: Jason Cooper <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Thomas Gleixner <[e-mail]>

Documentation/devicetree/bindings/interrupt-controller/ti,omap-intc-irq.txt

···
+Omap2/3 intc controller
+
+On TI omap2 and 3 the intc interrupt controller can provide
+96 or 128 IRQ signals to the ARM host depending on the SoC.
+
+Required Properties:
+- compatible: should be one of
+			"ti,omap2-intc"
+			"ti,omap3-intc"
+			"ti,dm814-intc"
+			"ti,dm816-intc"
+			"ti,am33xx-intc"
+
+- interrupt-controller : Identifies the node as an interrupt controller
+- #interrupt-cells : Specifies the number of cells needed to encode interrupt
+		     source, should be 1 for intc
+- interrupts: interrupt reference to primary interrupt controller
+
+Please refer to interrupts.txt in this directory for details of the common
+Interrupt Controllers bindings used by client devices.
+
+Example:
+	intc: interrupt-controller@48200000 {
+		compatible = "ti,omap3-intc";
+		interrupt-controller;
+		#interrupt-cells = <1>;
+		reg = <0x48200000 0x1000>;
+	};

drivers/irqchip/irq-omap-intc.c

···
 	set_handle_irq(omap_intc_handle_irq);
 }
 
-void __init ti81xx_init_irq(void)
-{
-	omap_nr_irqs = 96;
-	omap_nr_pending = 4;
-	omap_init_irq(OMAP34XX_IC_BASE, NULL);
-	set_handle_irq(omap_intc_handle_irq);
-}
-
 static int __init intc_of_init(struct device_node *node,
 			     struct device_node *parent)
 {
···
 	if (WARN_ON(!node))
 		return -ENODEV;
 
-	if (of_device_is_compatible(node, "ti,am33xx-intc")) {
+	if (of_device_is_compatible(node, "ti,dm814-intc") ||
+	    of_device_is_compatible(node, "ti,dm816-intc") ||
+	    of_device_is_compatible(node, "ti,am33xx-intc")) {
 		omap_nr_irqs = 128;
 		omap_nr_pending = 4;
 	}
···
 
 IRQCHIP_DECLARE(omap2_intc, "ti,omap2-intc", intc_of_init);
 IRQCHIP_DECLARE(omap3_intc, "ti,omap3-intc", intc_of_init);
+IRQCHIP_DECLARE(dm814x_intc, "ti,dm814-intc", intc_of_init);
+IRQCHIP_DECLARE(dm816x_intc, "ti,dm816-intc", intc_of_init);
 IRQCHIP_DECLARE(am33xx_intc, "ti,am33xx-intc", intc_of_init);

include/linux/irqchip/irq-omap-intc.h

···
 
 void omap2_init_irq(void);
 void omap3_init_irq(void);
-void ti81xx_init_irq(void);
 
 int omap_irq_pending(void);
 void omap_intc_save_context(void);