ARM: OMAP4+: PRM: register interrupt information from DT

Allow the PRM interrupt information to be picked up from device tree.
the only exception is for OMAP4 which uses values pre-populated and allows
compatibility with older dtb.

Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index d4d745e5e64b..5a70c91dea10 100644
--- a/arch/arm/mach-omap2/prm44xx.c
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -17,6 +17,7 @@
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/io.h>
+#include <linux/of_irq.h>
 
 
 #include "soc.h"
@@ -699,11 +700,50 @@ int __init omap44xx_prm_init(void)
         return prm_register(&omap44xx_prm_ll_data);
 }
 
+static struct of_device_id omap_prm_dt_match_table[] = {
+        { .compatible = "ti,omap4-prm" },
+        { .compatible = "ti,omap5-prm" },
+        { .compatible = "ti,dra7-prm" },
+        { }
+};
+
 static int omap44xx_prm_late_init(void)
 {
+        struct device_node *np;
+        int irq_num;
+
         if (!(prm_features & PRM_HAS_IO_WAKEUP))
                 return 0;
 
+        /* OMAP4+ is DT only now */
+        if (!of_have_populated_dt())
+                return 0;
+
+        np = of_find_matching_node(NULL, omap_prm_dt_match_table);
+
+        if (!np) {
+                /* Default loaded up with OMAP4 values */
+                if (!cpu_is_omap44xx())
+                        return 0;
+        } else {
+                irq_num = of_irq_get(np, 0);
+                /*
+                 * Already have OMAP4 IRQ num. For all other platforms, we need
+                 * IRQ numbers from DT
+                 */
+                if (irq_num < 0 && !cpu_is_omap44xx()) {
+                        if (irq_num == -EPROBE_DEFER)
+                                return irq_num;
+
+                        /* Have nothing to do */
+                        return 0;
+                }
+
+                /* Once OMAP4 DT is filled as well */
+                if (irq_num >= 0)
+                        omap4_prcm_irq_setup.irq = irq_num;
+        }
+
         omap44xx_prm_enable_io_wakeup();
 
         return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);