ARM: OMAP2+: Prepare for device-tree PMU support

If device-tree is present, then do not create the PMU device from within
the OMAP specific PMU code. This is required to allow device-tree to
create the PMU device from the PMU device-tree node.

PMU is not currently supported for OMAP4430 (due to a dependency on
having a cross-trigger interface driver) and so ensure that this
indicated on boot with or without device-tree.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Benoit Cousson <benoit.cousson@linaro.org>

1 files changed, 11 insertions, 3 deletions

diff --git a/arch/arm/mach-omap2/pmu.c b/arch/arm/mach-omap2/pmu.c
index 9debf822687c..9ace8eae7ee8 100644
--- a/arch/arm/mach-omap2/pmu.c
+++ b/arch/arm/mach-omap2/pmu.c
@@ -11,6 +11,8 @@
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  */
+#include <linux/of.h>
+
 #include <asm/pmu.h>
 
 #include "soc.h"
@@ -63,6 +65,15 @@ static int __init omap_init_pmu(void)
         unsigned oh_num;
         char **oh_names;
 
+        /* XXX Remove this check when the CTI driver is available */
+        if (cpu_is_omap443x()) {
+                pr_info("ARM PMU: not yet supported on OMAP4430 due to missing CTI driver\n");
+                return 0;
+        }
+
+        if (of_have_populated_dt())
+                return 0;
+
         /*
          * To create an ARM-PMU device the following HWMODs
          * are required for the various OMAP2+ devices.
@@ -75,9 +86,6 @@ static int __init omap_init_pmu(void)
         if (cpu_is_omap443x()) {
                 oh_num = ARRAY_SIZE(omap4430_pmu_oh_names);
                 oh_names = omap4430_pmu_oh_names;
-                /* XXX Remove the next two lines when CTI driver available */
-                pr_info("ARM PMU: not yet supported on OMAP4430 due to missing CTI driver\n");
-                return 0;
         } else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
                 oh_num = ARRAY_SIZE(omap3_pmu_oh_names);
                 oh_names = omap3_pmu_oh_names;