ARM: EXYNOS: allow dt based discovery of mct controller using clocksource_of_init

Add entries to __clksrc_of_table so that Exynos MCT controller is
discoverable using call to clocksource_of_init. With this change,
it would be appropriate to rename the function 'exynos4_timer_init'
as 'mct_init' since it aptly describes this function. Additionally,
the 'init_time' callback of all machine descriptors for exynos
platforms that were previously set to 'exynos4_timer_init' are now
set to either 'mct_init' or 'clocksource_of_init'.

Cc: Changhwan Youn <chaos.youn@samsung.com>
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

10 files changed, 18 insertions, 16 deletions

diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 70f94c87479d..52f51e7b4a0c 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -406,6 +406,7 @@ config MACH_EXYNOS4_DT
         bool "Samsung Exynos4 Machine using device tree"
         depends on ARCH_EXYNOS4
         select ARM_AMBA
+        select CLKSRC_OF
         select CPU_EXYNOS4210
         select HAVE_SAMSUNG_KEYPAD if INPUT_KEYBOARD
         select PINCTRL
@@ -422,6 +423,7 @@ config MACH_EXYNOS5_DT
         default y
         depends on ARCH_EXYNOS5
         select ARM_AMBA
+        select CLKSRC_OF
         select USE_OF
         help
           Machine support for Samsung EXYNOS5 machine with device tree enabled.
diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index 9339bb8954be..3b186eaaaa7b 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -12,7 +12,7 @@
 #ifndef __ARCH_ARM_MACH_EXYNOS_COMMON_H
 #define __ARCH_ARM_MACH_EXYNOS_COMMON_H
 
-extern void exynos4_timer_init(void);
+extern void mct_init(void);
 
 struct map_desc;
 void exynos_init_io(struct map_desc *mach_desc, int size);
diff --git a/arch/arm/mach-exynos/mach-armlex4210.c b/arch/arm/mach-exynos/mach-armlex4210.c
index 685f29173afa..3b1a34742679 100644
--- a/arch/arm/mach-exynos/mach-armlex4210.c
+++ b/arch/arm/mach-exynos/mach-armlex4210.c
@@ -202,6 +202,6 @@ MACHINE_START(ARMLEX4210, "ARMLEX4210")
         .map_io         = armlex4210_map_io,
         .init_machine   = armlex4210_machine_init,
         .init_late      = exynos_init_late,
-        .init_time      = exynos4_timer_init,
+        .init_time      = mct_init,
         .restart        = exynos4_restart,
 MACHINE_END
diff --git a/arch/arm/mach-exynos/mach-exynos4-dt.c b/arch/arm/mach-exynos/mach-exynos4-dt.c
index 3358088c822a..c4ae108e192d 100644
--- a/arch/arm/mach-exynos/mach-exynos4-dt.c
+++ b/arch/arm/mach-exynos/mach-exynos4-dt.c
@@ -13,6 +13,7 @@
 
 #include <linux/of_platform.h>
 #include <linux/serial_core.h>
+#include <linux/clocksource.h>
 
 #include <asm/mach/arch.h>
 #include <mach/map.h>
@@ -142,7 +143,7 @@ DT_MACHINE_START(EXYNOS4210_DT, "Samsung Exynos4 (Flattened Device Tree)")
         .map_io         = exynos4_dt_map_io,
         .init_machine   = exynos4_dt_machine_init,
         .init_late      = exynos_init_late,
-        .init_time      = exynos4_timer_init,
+        .init_time      = clocksource_of_init,
         .dt_compat      = exynos4_dt_compat,
         .restart        = exynos4_restart,
 MACHINE_END
diff --git a/arch/arm/mach-exynos/mach-exynos5-dt.c b/arch/arm/mach-exynos/mach-exynos5-dt.c
index acaeb14db54b..7da4791bfb8b 100644
--- a/arch/arm/mach-exynos/mach-exynos5-dt.c
+++ b/arch/arm/mach-exynos/mach-exynos5-dt.c
@@ -14,6 +14,7 @@
 #include <linux/serial_core.h>
 #include <linux/memblock.h>
 #include <linux/io.h>
+#include <linux/clocksource.h>
 
 #include <asm/mach/arch.h>
 #include <mach/map.h>
@@ -216,7 +217,7 @@ DT_MACHINE_START(EXYNOS5_DT, "SAMSUNG EXYNOS5 (Flattened Device Tree)")
         .map_io         = exynos5_dt_map_io,
         .init_machine   = exynos5_dt_machine_init,
         .init_late      = exynos_init_late,
-        .init_time      = exynos4_timer_init,
+        .init_time      = clocksource_of_init,
         .dt_compat      = exynos5_dt_compat,
         .restart        = exynos5_restart,
         .reserve        = exynos5_reserve,
diff --git a/arch/arm/mach-exynos/mach-nuri.c b/arch/arm/mach-exynos/mach-nuri.c
index 1ea79730187f..da3605d15110 100644
--- a/arch/arm/mach-exynos/mach-nuri.c
+++ b/arch/arm/mach-exynos/mach-nuri.c
@@ -1380,7 +1380,7 @@ MACHINE_START(NURI, "NURI")
         .map_io         = nuri_map_io,
         .init_machine   = nuri_machine_init,
         .init_late      = exynos_init_late,
-        .init_time      = exynos4_timer_init,
+        .init_time      = mct_init,
         .reserve        = &nuri_reserve,
         .restart        = exynos4_restart,
 MACHINE_END
diff --git a/arch/arm/mach-exynos/mach-origen.c b/arch/arm/mach-exynos/mach-origen.c
index 579d2d171daa..1772cd284f4c 100644
--- a/arch/arm/mach-exynos/mach-origen.c
+++ b/arch/arm/mach-exynos/mach-origen.c
@@ -815,7 +815,7 @@ MACHINE_START(ORIGEN, "ORIGEN")
         .map_io         = origen_map_io,
         .init_machine   = origen_machine_init,
         .init_late      = exynos_init_late,
-        .init_time      = exynos4_timer_init,
+        .init_time      = mct_init,
         .reserve        = &origen_reserve,
         .restart        = exynos4_restart,
 MACHINE_END
diff --git a/arch/arm/mach-exynos/mach-smdk4x12.c b/arch/arm/mach-exynos/mach-smdk4x12.c
index fe6149624b84..34a6356364eb 100644
--- a/arch/arm/mach-exynos/mach-smdk4x12.c
+++ b/arch/arm/mach-exynos/mach-smdk4x12.c
@@ -376,7 +376,7 @@ MACHINE_START(SMDK4212, "SMDK4212")
         .init_irq       = exynos4_init_irq,
         .map_io         = smdk4x12_map_io,
         .init_machine   = smdk4x12_machine_init,
-        .init_time      = exynos4_timer_init,
+        .init_time      = mct_init,
         .restart        = exynos4_restart,
         .reserve        = &smdk4x12_reserve,
 MACHINE_END
@@ -390,7 +390,7 @@ MACHINE_START(SMDK4412, "SMDK4412")
         .map_io         = smdk4x12_map_io,
         .init_machine   = smdk4x12_machine_init,
         .init_late      = exynos_init_late,
-        .init_time      = exynos4_timer_init,
+        .init_time      = mct_init,
         .restart        = exynos4_restart,
         .reserve        = &smdk4x12_reserve,
 MACHINE_END
diff --git a/arch/arm/mach-exynos/mach-smdkv310.c b/arch/arm/mach-exynos/mach-smdkv310.c
index d71672922b19..893b14e8c62a 100644
--- a/arch/arm/mach-exynos/mach-smdkv310.c
+++ b/arch/arm/mach-exynos/mach-smdkv310.c
@@ -423,7 +423,7 @@ MACHINE_START(SMDKV310, "SMDKV310")
         .init_irq       = exynos4_init_irq,
         .map_io         = smdkv310_map_io,
         .init_machine   = smdkv310_machine_init,
-        .init_time      = exynos4_timer_init,
+        .init_time      = mct_init,
         .reserve        = &smdkv310_reserve,
         .restart        = exynos4_restart,
 MACHINE_END
@@ -436,7 +436,7 @@ MACHINE_START(SMDKC210, "SMDKC210")
         .map_io         = smdkv310_map_io,
         .init_machine   = smdkv310_machine_init,
         .init_late      = exynos_init_late,
-        .init_time      = exynos4_timer_init,
+        .init_time      = mct_init,
         .reserve        = &smdkv310_reserve,
         .restart        = exynos4_restart,
 MACHINE_END
diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c
index f34c933314f3..545c98976e93 100644
--- a/arch/arm/mach-exynos/mct.c
+++ b/arch/arm/mach-exynos/mct.c
@@ -22,6 +22,7 @@
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/of_address.h>
+#include <linux/clocksource.h>
 
 #include <asm/arch_timer.h>
 #include <asm/localtimer.h>
@@ -507,17 +508,12 @@ static const struct of_device_id exynos_mct_ids[] = {
         { .compatible = "samsung,exynos4412-mct", .data = (void *)MCT_INT_PPI },
 };
 
-void __init exynos4_timer_init(void)
+void __init mct_init(void)
 {
         struct device_node *np = NULL;
         const struct of_device_id *match;
         u32 nr_irqs, i;
 
-        if (soc_is_exynos5440()) {
-                arch_timer_of_register();
-                return;
-        }
-
 #ifdef CONFIG_OF
         np = of_find_matching_node_and_match(NULL, exynos_mct_ids, &match);
 #endif
@@ -550,3 +546,5 @@ void __init exynos4_timer_init(void)
         exynos4_clocksource_init();
         exynos4_clockevent_init();
 }
+CLOCKSOURCE_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", mct_init)
+CLOCKSOURCE_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", mct_init)