ARM: ux500: Provide local timer support for Device Tree

This enables local timer (AKA: private timer) support for
all u8500 based hardware using DT.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

2 files changed, 14 insertions, 3 deletions

diff --git a/arch/arm/boot/dts/db8500.dtsi b/arch/arm/boot/dts/db8500.dtsi
index a81cce0f755e..d73dce645667 100644
--- a/arch/arm/boot/dts/db8500.dtsi
+++ b/arch/arm/boot/dts/db8500.dtsi
@@ -42,6 +42,12 @@
                         interrupts = <0 7 0x4>;
                 };
 
+                timer@a0410600 {
+                        compatible = "arm,cortex-a9-twd-timer";
+                        reg = <0xa0410600 0x20>;
+                        interrupts = <1 13 0x304>;
+                };
+
                 rtc@80154000 {
                         compatible = "stericsson,db8500-rtc";
                         reg = <0x80154000 0x1000>;
diff --git a/arch/arm/mach-ux500/timer.c b/arch/arm/mach-ux500/timer.c
index e9d580702fbb..d37df98b5c32 100644
--- a/arch/arm/mach-ux500/timer.c
+++ b/arch/arm/mach-ux500/timer.c
@@ -7,6 +7,7 @@
 #include <linux/io.h>
 #include <linux/errno.h>
 #include <linux/clksrc-dbx500-prcmu.h>
+#include <linux/of.h>
 
 #include <asm/smp_twd.h>
 
@@ -30,9 +31,13 @@ static void __init ux500_twd_init(void)
         twd_local_timer = cpu_is_u5500() ? &u5500_twd_local_timer :
                                            &u8500_twd_local_timer;
 
-        err = twd_local_timer_register(twd_local_timer);
-        if (err)
-                pr_err("twd_local_timer_register failed %d\n", err);
+        if (of_have_populated_dt())
+                twd_local_timer_of_register();
+        else {
+                err = twd_local_timer_register(twd_local_timer);
+                if (err)
+                        pr_err("twd_local_timer_register failed %d\n", err);
+        }
 }
 #else
 #define ux500_twd_init()        do { } while(0)