[PATCH 00/11] arm: omap: counter32k rework

[PATCH 00/11] arm: omap: counter32k rework

[Felipe Balbi]

Hi,

the following patches de-obfuscate arch/arm/mach-omap2/timer.c
and start moving code to drivers/clocksource. So far only counter32k
has been moved over.

Note that we can't get rid of all the code (yet) because there are
still platforms relying to legacy boot and because of the strong
coupling with OMAP's hwmod layer.

This has a dependency on [1]. Boot tested with AM335x and AM437x.

[1] http://marc.info/?l=linux-omap&m=144354336924308&w=2

Here are the changes since v1:

  - removed register_persistent_clock() in favor of CLOCK_SOURCE_SUSPEND_NONSTOP
  - make dropped patch setting status=okay to 32k
  - made sure hwmod wouldn't disable 32k counter
  - rebased on v4.3-rc4

Boot logs:

  - AM437x SK:	http://hastebin.com/zuvetojaqe
  - BBB:   	http://hastebin.com/ihuponayap

Felipe Balbi (11):
  arm: omap2: timer: get rid of obfuscating macros
  arm: omap2: timer: add a gptimer argument to sync32k_timer_init()
  arm: omap2: timer: remove __omap_gptimer_init()
  arm: omap2: timer: provide generic sync32k_timer_init function
  arm: omap2: timer: move realtime_counter_init() around
  arm: omap2: timer: always call clocksource_of_init() when DT
  arm: omap2: timer: remove omap4_local_timer_init
  arm: omap2: timer: rename omap_sync32k_timer_init()
  clocksource: add TI 32.768 Hz counter driver
  arm: omap2+: select 32k clocksource driver
  arm: omap2: timer: limit hwmod usage to non-DT boots

 arch/arm/mach-omap2/Kconfig         |   1 +
 arch/arm/mach-omap2/board-generic.c |  14 ++--
 arch/arm/mach-omap2/board-ldp.c     |   2 +-
 arch/arm/mach-omap2/board-rx51.c    |   2 +-
 arch/arm/mach-omap2/common.h        |   4 +-
 arch/arm/mach-omap2/timer.c         | 141 +++++++++++++++---------------------
 drivers/clocksource/Kconfig         |   7 ++
 drivers/clocksource/Makefile        |   1 +
 drivers/clocksource/timer-ti-32k.c  | 122 +++++++++++++++++++++++++++++++
 9 files changed, 199 insertions(+), 95 deletions(-)
 create mode 100644 drivers/clocksource/timer-ti-32k.c

-- 
2.5.3

[PATCH 01/11] arm: omap2: timer: get rid of obfuscating macros

[Felipe Balbi]

those macros just make it a lot more difficult
to grep around and actually find similarities.

In this patch, we will simply remove them and
replace with actual functions and later commits
will come to further clean this up.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 arch/arm/mach-omap2/timer.c | 70 ++++++++++++++++++++++++++++-----------------
 1 file changed, 43 insertions(+), 27 deletions(-)

diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 548d922cb107..23e58ea6a171 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -592,53 +592,69 @@ static inline void __init realtime_counter_init(void)
 {}
 #endif
 
-#define OMAP_SYS_GP_TIMER_INIT(name, clkev_nr, clkev_src, clkev_prop,	\
-			       clksrc_nr, clksrc_src, clksrc_prop)	\
-void __init omap##name##_gptimer_timer_init(void)			\
-{									\
-	omap_clk_init();					\
-	omap_dmtimer_init();						\
-	omap2_gp_clockevent_init((clkev_nr), clkev_src, clkev_prop);	\
-	omap2_gptimer_clocksource_init((clksrc_nr), clksrc_src,		\
-					clksrc_prop);			\
+static void __init __omap_gptimer_init(int clkev_nr, const char *clkev_src,
+		const char *clkev_prop, int clksrc_nr, const char *clksrc_src,
+		const char *clksrc_prop)
+{
+	omap_clk_init();
+	omap_dmtimer_init();
+	omap2_gp_clockevent_init(clkev_nr, clkev_src, clkev_prop);
+	omap2_gptimer_clocksource_init(clksrc_nr, clksrc_src, clksrc_prop);
 }
 
-#define OMAP_SYS_32K_TIMER_INIT(name, clkev_nr, clkev_src, clkev_prop,	\
-				clksrc_nr, clksrc_src, clksrc_prop)	\
-void __init omap##name##_sync32k_timer_init(void)		\
-{									\
-	omap_clk_init();					\
-	omap_dmtimer_init();						\
-	omap2_gp_clockevent_init((clkev_nr), clkev_src, clkev_prop);	\
-	/* Enable the use of clocksource="gp_timer" kernel parameter */	\
-	if (use_gptimer_clksrc)						\
-		omap2_gptimer_clocksource_init((clksrc_nr), clksrc_src,	\
-						clksrc_prop);		\
-	else								\
-		omap2_sync32k_clocksource_init();			\
+static void __init __omap_sync32k_timer_init(int clkev_nr, const char *clkev_src,
+		const char *clkev_prop, int clksrc_nr, const char *clksrc_src,
+		const char *clksrc_prop)
+{
+	omap_clk_init();
+	omap_dmtimer_init();
+	omap2_gp_clockevent_init(clkev_nr, clkev_src, clkev_prop);
+
+	/* Enable the use of clocksource="gp_timer" kernel parameter */
+	if (use_gptimer_clksrc)
+		omap2_gptimer_clocksource_init(clksrc_nr, clksrc_src,
+						clksrc_prop);
+	else
+		omap2_sync32k_clocksource_init();
 }
 
 #ifdef CONFIG_ARCH_OMAP2
-OMAP_SYS_32K_TIMER_INIT(2, 1, "timer_32k_ck", "ti,timer-alwon",
+void __init omap2_sync32k_timer_init(void)
+{
+	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
 			2, "timer_sys_ck", NULL);
+}
 #endif /* CONFIG_ARCH_OMAP2 */
 
 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM43XX)
-OMAP_SYS_32K_TIMER_INIT(3, 1, "timer_32k_ck", "ti,timer-alwon",
+void __init omap3_sync32k_timer_init(void)
+{
+	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
 			2, "timer_sys_ck", NULL);
-OMAP_SYS_32K_TIMER_INIT(3_secure, 12, "secure_32k_fck", "ti,timer-secure",
+}
+
+void __init omap3_secure_sync32k_timer_init(void)
+{
+	__omap_sync32k_timer_init(12, "secure_32k_fck", "ti,timer-secure",
 			2, "timer_sys_ck", NULL);
+}
 #endif /* CONFIG_ARCH_OMAP3 */
 
 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM33XX)
-OMAP_SYS_GP_TIMER_INIT(3, 2, "timer_sys_ck", NULL,
+void __init omap3_gptimer_timer_init(void)
+{
+	__omap_gptimer_init(2, "timer_sys_ck", NULL,
 		       1, "timer_sys_ck", "ti,timer-alwon");
+}
 #endif
 
 #if defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_SOC_OMAP5) || \
 	defined(CONFIG_SOC_DRA7XX) || defined(CONFIG_SOC_AM43XX)
-static OMAP_SYS_32K_TIMER_INIT(4, 1, "timer_32k_ck", "ti,timer-alwon",
+static void __init omap4_sync32k_timer_init(void)
+{
+	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
 			       2, "sys_clkin_ck", NULL);
+}
 
 void __init omap4_local_timer_init(void)
 {
-- 
2.5.3

[PATCH 02/11] arm: omap2: timer: add a gptimer argument to sync32k_timer_init()

[Felipe Balbi]

as it turns out, __omap_gptimer_init() and
__omap_sync32k_timer_init() are essentially
the same thing, but __omap_gptimer_init() wants
to always use gptimer.

Instead of forcing all those devices to pass
a use_gptimer cmdline argument, we add a new
function argument to __omap_sync32k_timer_init()
in preparation to deleting __omap_gptimer_init().

On a follow-up patch, we will remove uses of
__omap_gptimer_init() and replace them with
__omap_sync32k_timer_init() and pass the last
argument as true.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 arch/arm/mach-omap2/timer.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 23e58ea6a171..f53ed049d710 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -604,14 +604,14 @@ static void __init __omap_gptimer_init(int clkev_nr, const char *clkev_src,
 
 static void __init __omap_sync32k_timer_init(int clkev_nr, const char *clkev_src,
 		const char *clkev_prop, int clksrc_nr, const char *clksrc_src,
-		const char *clksrc_prop)
+		const char *clksrc_prop, bool gptimer)
 {
 	omap_clk_init();
 	omap_dmtimer_init();
 	omap2_gp_clockevent_init(clkev_nr, clkev_src, clkev_prop);
 
 	/* Enable the use of clocksource="gp_timer" kernel parameter */
-	if (use_gptimer_clksrc)
+	if (use_gptimer_clksrc || gptimer)
 		omap2_gptimer_clocksource_init(clksrc_nr, clksrc_src,
 						clksrc_prop);
 	else
@@ -622,7 +622,7 @@ static void __init __omap_sync32k_timer_init(int clkev_nr, const char *clkev_src
 void __init omap2_sync32k_timer_init(void)
 {
 	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
-			2, "timer_sys_ck", NULL);
+			2, "timer_sys_ck", NULL, false);
 }
 #endif /* CONFIG_ARCH_OMAP2 */
 
@@ -630,13 +630,13 @@ void __init omap2_sync32k_timer_init(void)
 void __init omap3_sync32k_timer_init(void)
 {
 	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
-			2, "timer_sys_ck", NULL);
+			2, "timer_sys_ck", NULL, false);
 }
 
 void __init omap3_secure_sync32k_timer_init(void)
 {
 	__omap_sync32k_timer_init(12, "secure_32k_fck", "ti,timer-secure",
-			2, "timer_sys_ck", NULL);
+			2, "timer_sys_ck", NULL, false);
 }
 #endif /* CONFIG_ARCH_OMAP3 */
 
@@ -653,7 +653,7 @@ void __init omap3_gptimer_timer_init(void)
 static void __init omap4_sync32k_timer_init(void)
 {
 	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
-			       2, "sys_clkin_ck", NULL);
+			2, "sys_clkin_ck", NULL, false);
 }
 
 void __init omap4_local_timer_init(void)
-- 
2.5.3

[PATCH 03/11] arm: omap2: timer: remove __omap_gptimer_init()

[Felipe Balbi]

__omap_sync32k_timer_init(), now takes the clock
source as a parameter. This means we no longer need
__omap_gptimer_init().

Note that __omap_sync32k_timer_init() will be
renamed in a follow-up patch as it's not longer 32k
source specific.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 arch/arm/mach-omap2/timer.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index f53ed049d710..976ff9fa3594 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -592,16 +592,6 @@ static inline void __init realtime_counter_init(void)
 {}
 #endif
 
-static void __init __omap_gptimer_init(int clkev_nr, const char *clkev_src,
-		const char *clkev_prop, int clksrc_nr, const char *clksrc_src,
-		const char *clksrc_prop)
-{
-	omap_clk_init();
-	omap_dmtimer_init();
-	omap2_gp_clockevent_init(clkev_nr, clkev_src, clkev_prop);
-	omap2_gptimer_clocksource_init(clksrc_nr, clksrc_src, clksrc_prop);
-}
-
 static void __init __omap_sync32k_timer_init(int clkev_nr, const char *clkev_src,
 		const char *clkev_prop, int clksrc_nr, const char *clksrc_src,
 		const char *clksrc_prop, bool gptimer)
@@ -643,8 +633,8 @@ void __init omap3_secure_sync32k_timer_init(void)
 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM33XX)
 void __init omap3_gptimer_timer_init(void)
 {
-	__omap_gptimer_init(2, "timer_sys_ck", NULL,
-		       1, "timer_sys_ck", "ti,timer-alwon");
+	__omap_sync32k_timer_init(2, "timer_sys_ck", NULL,
+			1, "timer_sys_ck", "ti,timer-alwon", true);
 }
 #endif
 
-- 
2.5.3

[PATCH 04/11] arm: omap2: timer: provide generic sync32k_timer_init function

[Felipe Balbi]

instead of constantly defining a small wrapper
around __omap_sync32k_timer_init(), let's define
a generic one which can be used by all OMAPs.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 arch/arm/mach-omap2/board-generic.c | 10 +++++-----
 arch/arm/mach-omap2/board-ldp.c     |  2 +-
 arch/arm/mach-omap2/board-rx51.c    |  2 +-
 arch/arm/mach-omap2/common.h        |  3 +--
 arch/arm/mach-omap2/timer.c         | 20 +++-----------------
 5 files changed, 11 insertions(+), 26 deletions(-)

diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
index 9df14ed7dab1..871db0f0fa66 100644
--- a/arch/arm/mach-omap2/board-generic.c
+++ b/arch/arm/mach-omap2/board-generic.c
@@ -46,7 +46,7 @@ DT_MACHINE_START(OMAP242X_DT, "Generic OMAP2420 (Flattened Device Tree)")
 	.map_io		= omap242x_map_io,
 	.init_early	= omap2420_init_early,
 	.init_machine	= omap_generic_init,
-	.init_time	= omap2_sync32k_timer_init,
+	.init_time	= omap_sync32k_timer_init,
 	.dt_compat	= omap242x_boards_compat,
 	.restart	= omap2xxx_restart,
 MACHINE_END
@@ -63,7 +63,7 @@ DT_MACHINE_START(OMAP243X_DT, "Generic OMAP2430 (Flattened Device Tree)")
 	.map_io		= omap243x_map_io,
 	.init_early	= omap2430_init_early,
 	.init_machine	= omap_generic_init,
-	.init_time	= omap2_sync32k_timer_init,
+	.init_time	= omap_sync32k_timer_init,
 	.dt_compat	= omap243x_boards_compat,
 	.restart	= omap2xxx_restart,
 MACHINE_END
@@ -82,7 +82,7 @@ DT_MACHINE_START(OMAP3_N900_DT, "Nokia RX-51 board")
 	.init_early	= omap3430_init_early,
 	.init_machine	= omap_generic_init,
 	.init_late	= omap3_init_late,
-	.init_time	= omap3_sync32k_timer_init,
+	.init_time	= omap_sync32k_timer_init,
 	.dt_compat	= n900_boards_compat,
 	.restart	= omap3xxx_restart,
 MACHINE_END
@@ -100,7 +100,7 @@ DT_MACHINE_START(OMAP3_DT, "Generic OMAP3 (Flattened Device Tree)")
 	.init_early	= omap3430_init_early,
 	.init_machine	= omap_generic_init,
 	.init_late	= omap3_init_late,
-	.init_time	= omap3_sync32k_timer_init,
+	.init_time	= omap_sync32k_timer_init,
 	.dt_compat	= omap3_boards_compat,
 	.restart	= omap3xxx_restart,
 MACHINE_END
@@ -116,7 +116,7 @@ DT_MACHINE_START(OMAP36XX_DT, "Generic OMAP36xx (Flattened Device Tree)")
 	.init_early	= omap3630_init_early,
 	.init_machine	= omap_generic_init,
 	.init_late	= omap3_init_late,
-	.init_time	= omap3_sync32k_timer_init,
+	.init_time	= omap_sync32k_timer_init,
 	.dt_compat	= omap36xx_boards_compat,
 	.restart	= omap3xxx_restart,
 MACHINE_END
diff --git a/arch/arm/mach-omap2/board-ldp.c b/arch/arm/mach-omap2/board-ldp.c
index c2975af4cd5d..0d3a57c6931f 100644
--- a/arch/arm/mach-omap2/board-ldp.c
+++ b/arch/arm/mach-omap2/board-ldp.c
@@ -424,6 +424,6 @@ MACHINE_START(OMAP_LDP, "OMAP LDP board")
 	.init_irq	= omap3_init_irq,
 	.init_machine	= omap_ldp_init,
 	.init_late	= omap3430_init_late,
-	.init_time	= omap3_sync32k_timer_init,
+	.init_time	= omap_sync32k_timer_init,
 	.restart	= omap3xxx_restart,
 MACHINE_END
diff --git a/arch/arm/mach-omap2/board-rx51.c b/arch/arm/mach-omap2/board-rx51.c
index 2d1e5a6beb85..830256c434ec 100644
--- a/arch/arm/mach-omap2/board-rx51.c
+++ b/arch/arm/mach-omap2/board-rx51.c
@@ -136,6 +136,6 @@ MACHINE_START(NOKIA_RX51, "Nokia RX-51 board")
 	.init_irq	= omap3_init_irq,
 	.init_machine	= rx51_init,
 	.init_late	= omap3430_init_late,
-	.init_time	= omap3_sync32k_timer_init,
+	.init_time	= omap_sync32k_timer_init,
 	.restart	= omap3xxx_restart,
 MACHINE_END
diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index 92e92cfc2775..844ad031f7f0 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -88,8 +88,7 @@ static inline int omap_mux_late_init(void)
 
 extern void omap2_init_common_infrastructure(void);
 
-extern void omap2_sync32k_timer_init(void);
-extern void omap3_sync32k_timer_init(void);
+extern void omap_sync32k_timer_init(void);
 extern void omap3_secure_sync32k_timer_init(void);
 extern void omap3_gptimer_timer_init(void);
 extern void omap4_local_timer_init(void);
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 976ff9fa3594..d14e25b2d7a4 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -608,21 +608,13 @@ static void __init __omap_sync32k_timer_init(int clkev_nr, const char *clkev_src
 		omap2_sync32k_clocksource_init();
 }
 
-#ifdef CONFIG_ARCH_OMAP2
-void __init omap2_sync32k_timer_init(void)
+void __init omap_sync32k_timer_init(void)
 {
 	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
 			2, "timer_sys_ck", NULL, false);
 }
-#endif /* CONFIG_ARCH_OMAP2 */
 
 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM43XX)
-void __init omap3_sync32k_timer_init(void)
-{
-	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
-			2, "timer_sys_ck", NULL, false);
-}
-
 void __init omap3_secure_sync32k_timer_init(void)
 {
 	__omap_sync32k_timer_init(12, "secure_32k_fck", "ti,timer-secure",
@@ -640,15 +632,9 @@ void __init omap3_gptimer_timer_init(void)
 
 #if defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_SOC_OMAP5) || \
 	defined(CONFIG_SOC_DRA7XX) || defined(CONFIG_SOC_AM43XX)
-static void __init omap4_sync32k_timer_init(void)
-{
-	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
-			2, "sys_clkin_ck", NULL, false);
-}
-
 void __init omap4_local_timer_init(void)
 {
-	omap4_sync32k_timer_init();
+	omap_sync32k_timer_init();
 	clocksource_of_init();
 }
 #endif
@@ -656,7 +642,7 @@ void __init omap4_local_timer_init(void)
 #if defined(CONFIG_SOC_OMAP5) || defined(CONFIG_SOC_DRA7XX)
 void __init omap5_realtime_timer_init(void)
 {
-	omap4_sync32k_timer_init();
+	omap_sync32k_timer_init();
 	realtime_counter_init();
 
 	clocksource_of_init();
-- 
2.5.3

[PATCH 05/11] arm: omap2: timer: move realtime_counter_init() around

[Felipe Balbi]

no functional changes, just moving that function
closer to its calling location.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 arch/arm/mach-omap2/timer.c | 102 ++++++++++++++++++++++----------------------
 1 file changed, 50 insertions(+), 52 deletions(-)

diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index d14e25b2d7a4..dcc0f032e717 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -476,7 +476,55 @@ static void __init omap2_gptimer_clocksource_init(int gptimer_id,
 			clocksource_gpt.name, clksrc.rate);
 }
 
-#ifdef CONFIG_SOC_HAS_REALTIME_COUNTER
+static void __init __omap_sync32k_timer_init(int clkev_nr, const char *clkev_src,
+		const char *clkev_prop, int clksrc_nr, const char *clksrc_src,
+		const char *clksrc_prop, bool gptimer)
+{
+	omap_clk_init();
+	omap_dmtimer_init();
+	omap2_gp_clockevent_init(clkev_nr, clkev_src, clkev_prop);
+
+	/* Enable the use of clocksource="gp_timer" kernel parameter */
+	if (use_gptimer_clksrc || gptimer)
+		omap2_gptimer_clocksource_init(clksrc_nr, clksrc_src,
+						clksrc_prop);
+	else
+		omap2_sync32k_clocksource_init();
+}
+
+void __init omap_sync32k_timer_init(void)
+{
+	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
+			2, "timer_sys_ck", NULL, false);
+}
+
+#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM43XX)
+void __init omap3_secure_sync32k_timer_init(void)
+{
+	__omap_sync32k_timer_init(12, "secure_32k_fck", "ti,timer-secure",
+			2, "timer_sys_ck", NULL, false);
+}
+#endif /* CONFIG_ARCH_OMAP3 */
+
+#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM33XX)
+void __init omap3_gptimer_timer_init(void)
+{
+	__omap_sync32k_timer_init(2, "timer_sys_ck", NULL,
+			1, "timer_sys_ck", "ti,timer-alwon", true);
+}
+#endif
+
+#if defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_SOC_OMAP5) || \
+	defined(CONFIG_SOC_DRA7XX) || defined(CONFIG_SOC_AM43XX)
+void __init omap4_local_timer_init(void)
+{
+	omap_sync32k_timer_init();
+	clocksource_of_init();
+}
+#endif
+
+#if defined(CONFIG_SOC_OMAP5) || defined(CONFIG_SOC_DRA7XX)
+
 /*
  * The realtime counter also called master counter, is a free-running
  * counter, which is related to real time. It produces the count used
@@ -488,6 +536,7 @@ static void __init omap2_gptimer_clocksource_init(int gptimer_id,
  */
 static void __init realtime_counter_init(void)
 {
+#ifdef CONFIG_SOC_HAS_REALTIME_COUNTER
 	void __iomem *base;
 	static struct clk *sys_clk;
 	unsigned long rate;
@@ -586,60 +635,9 @@ sysclk1_based:
 	set_cntfreq();
 
 	iounmap(base);
-}
-#else
-static inline void __init realtime_counter_init(void)
-{}
 #endif
-
-static void __init __omap_sync32k_timer_init(int clkev_nr, const char *clkev_src,
-		const char *clkev_prop, int clksrc_nr, const char *clksrc_src,
-		const char *clksrc_prop, bool gptimer)
-{
-	omap_clk_init();
-	omap_dmtimer_init();
-	omap2_gp_clockevent_init(clkev_nr, clkev_src, clkev_prop);
-
-	/* Enable the use of clocksource="gp_timer" kernel parameter */
-	if (use_gptimer_clksrc || gptimer)
-		omap2_gptimer_clocksource_init(clksrc_nr, clksrc_src,
-						clksrc_prop);
-	else
-		omap2_sync32k_clocksource_init();
-}
-
-void __init omap_sync32k_timer_init(void)
-{
-	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
-			2, "timer_sys_ck", NULL, false);
 }
 
-#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM43XX)
-void __init omap3_secure_sync32k_timer_init(void)
-{
-	__omap_sync32k_timer_init(12, "secure_32k_fck", "ti,timer-secure",
-			2, "timer_sys_ck", NULL, false);
-}
-#endif /* CONFIG_ARCH_OMAP3 */
-
-#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM33XX)
-void __init omap3_gptimer_timer_init(void)
-{
-	__omap_sync32k_timer_init(2, "timer_sys_ck", NULL,
-			1, "timer_sys_ck", "ti,timer-alwon", true);
-}
-#endif
-
-#if defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_SOC_OMAP5) || \
-	defined(CONFIG_SOC_DRA7XX) || defined(CONFIG_SOC_AM43XX)
-void __init omap4_local_timer_init(void)
-{
-	omap_sync32k_timer_init();
-	clocksource_of_init();
-}
-#endif
-
-#if defined(CONFIG_SOC_OMAP5) || defined(CONFIG_SOC_DRA7XX)
 void __init omap5_realtime_timer_init(void)
 {
 	omap_sync32k_timer_init();
-- 
2.5.3

[PATCH 06/11] arm: omap2: timer: always call clocksource_of_init() when DT

[Felipe Balbi]

If booting with DT, let's make sure to always
call clocksource_of_init() as this will make
it easier to move timer code to drivers/clocksource
in the future.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 arch/arm/mach-omap2/timer.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index dcc0f032e717..b523426f38a5 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -496,6 +496,9 @@ void __init omap_sync32k_timer_init(void)
 {
 	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
 			2, "timer_sys_ck", NULL, false);
+
+	if (of_have_populated_dt())
+		clocksource_of_init();
 }
 
 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM43XX)
@@ -519,7 +522,6 @@ void __init omap3_gptimer_timer_init(void)
 void __init omap4_local_timer_init(void)
 {
 	omap_sync32k_timer_init();
-	clocksource_of_init();
 }
 #endif
 
@@ -640,10 +642,8 @@ sysclk1_based:
 
 void __init omap5_realtime_timer_init(void)
 {
-	omap_sync32k_timer_init();
 	realtime_counter_init();
-
-	clocksource_of_init();
+	omap_sync32k_timer_init();
 }
 #endif /* CONFIG_SOC_OMAP5 || CONFIG_SOC_DRA7XX */
 
-- 
2.5.3

[PATCH 07/11] arm: omap2: timer: remove omap4_local_timer_init

[Felipe Balbi]

We're now always calling clocksource_of_init()
whenever booting with DT, so we can use the
generic omap_sync32k_timer_init() (which will
be renamed in a follow-up patch) for OMAP4
as well.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 arch/arm/mach-omap2/board-generic.c | 4 ++--
 arch/arm/mach-omap2/common.h        | 1 -
 arch/arm/mach-omap2/timer.c         | 8 --------
 3 files changed, 2 insertions(+), 11 deletions(-)

diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
index 871db0f0fa66..20d5e82ab6ee 100644
--- a/arch/arm/mach-omap2/board-generic.c
+++ b/arch/arm/mach-omap2/board-generic.c
@@ -228,7 +228,7 @@ DT_MACHINE_START(OMAP4_DT, "Generic OMAP4 (Flattened Device Tree)")
 	.init_irq	= omap_gic_of_init,
 	.init_machine	= omap_generic_init,
 	.init_late	= omap4430_init_late,
-	.init_time	= omap4_local_timer_init,
+	.init_time	= omap_sync32k_timer_init,
 	.dt_compat	= omap4_boards_compat,
 	.restart	= omap44xx_restart,
 MACHINE_END
@@ -272,7 +272,7 @@ DT_MACHINE_START(AM43_DT, "Generic AM43 (Flattened Device Tree)")
 	.init_late	= am43xx_init_late,
 	.init_irq	= omap_gic_of_init,
 	.init_machine	= omap_generic_init,
-	.init_time	= omap4_local_timer_init,
+	.init_time	= omap_sync32k_timer_init,
 	.dt_compat	= am43_boards_compat,
 	.restart	= omap44xx_restart,
 MACHINE_END
diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index 844ad031f7f0..bf42fc4e78f4 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -91,7 +91,6 @@ extern void omap2_init_common_infrastructure(void);
 extern void omap_sync32k_timer_init(void);
 extern void omap3_secure_sync32k_timer_init(void);
 extern void omap3_gptimer_timer_init(void);
-extern void omap4_local_timer_init(void);
 #ifdef CONFIG_CACHE_L2X0
 int omap_l2_cache_init(void);
 #define OMAP_L2C_AUX_CTRL	(L2C_AUX_CTRL_SHARED_OVERRIDE | \
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index b523426f38a5..f41e526ffa46 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -517,14 +517,6 @@ void __init omap3_gptimer_timer_init(void)
 }
 #endif
 
-#if defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_SOC_OMAP5) || \
-	defined(CONFIG_SOC_DRA7XX) || defined(CONFIG_SOC_AM43XX)
-void __init omap4_local_timer_init(void)
-{
-	omap_sync32k_timer_init();
-}
-#endif
-
 #if defined(CONFIG_SOC_OMAP5) || defined(CONFIG_SOC_DRA7XX)
 
 /*
-- 
2.5.3

[PATCH 08/11] arm: omap2: timer: rename omap_sync32k_timer_init()

[Felipe Balbi]

this function is not only about the 32k sync
timer, it's OMAP's generic init_time implementation.

Let's rename it to make that detail easier to
notice.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 arch/arm/mach-omap2/board-generic.c | 14 +++++++-------
 arch/arm/mach-omap2/board-ldp.c     |  2 +-
 arch/arm/mach-omap2/board-rx51.c    |  2 +-
 arch/arm/mach-omap2/common.h        |  2 +-
 arch/arm/mach-omap2/timer.c         |  4 ++--
 5 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
index 20d5e82ab6ee..e51fb8245704 100644
--- a/arch/arm/mach-omap2/board-generic.c
+++ b/arch/arm/mach-omap2/board-generic.c
@@ -46,7 +46,7 @@ DT_MACHINE_START(OMAP242X_DT, "Generic OMAP2420 (Flattened Device Tree)")
 	.map_io		= omap242x_map_io,
 	.init_early	= omap2420_init_early,
 	.init_machine	= omap_generic_init,
-	.init_time	= omap_sync32k_timer_init,
+	.init_time	= omap_init_time,
 	.dt_compat	= omap242x_boards_compat,
 	.restart	= omap2xxx_restart,
 MACHINE_END
@@ -63,7 +63,7 @@ DT_MACHINE_START(OMAP243X_DT, "Generic OMAP2430 (Flattened Device Tree)")
 	.map_io		= omap243x_map_io,
 	.init_early	= omap2430_init_early,
 	.init_machine	= omap_generic_init,
-	.init_time	= omap_sync32k_timer_init,
+	.init_time	= omap_init_time,
 	.dt_compat	= omap243x_boards_compat,
 	.restart	= omap2xxx_restart,
 MACHINE_END
@@ -82,7 +82,7 @@ DT_MACHINE_START(OMAP3_N900_DT, "Nokia RX-51 board")
 	.init_early	= omap3430_init_early,
 	.init_machine	= omap_generic_init,
 	.init_late	= omap3_init_late,
-	.init_time	= omap_sync32k_timer_init,
+	.init_time	= omap_init_time,
 	.dt_compat	= n900_boards_compat,
 	.restart	= omap3xxx_restart,
 MACHINE_END
@@ -100,7 +100,7 @@ DT_MACHINE_START(OMAP3_DT, "Generic OMAP3 (Flattened Device Tree)")
 	.init_early	= omap3430_init_early,
 	.init_machine	= omap_generic_init,
 	.init_late	= omap3_init_late,
-	.init_time	= omap_sync32k_timer_init,
+	.init_time	= omap_init_time,
 	.dt_compat	= omap3_boards_compat,
 	.restart	= omap3xxx_restart,
 MACHINE_END
@@ -116,7 +116,7 @@ DT_MACHINE_START(OMAP36XX_DT, "Generic OMAP36xx (Flattened Device Tree)")
 	.init_early	= omap3630_init_early,
 	.init_machine	= omap_generic_init,
 	.init_late	= omap3_init_late,
-	.init_time	= omap_sync32k_timer_init,
+	.init_time	= omap_init_time,
 	.dt_compat	= omap36xx_boards_compat,
 	.restart	= omap3xxx_restart,
 MACHINE_END
@@ -228,7 +228,7 @@ DT_MACHINE_START(OMAP4_DT, "Generic OMAP4 (Flattened Device Tree)")
 	.init_irq	= omap_gic_of_init,
 	.init_machine	= omap_generic_init,
 	.init_late	= omap4430_init_late,
-	.init_time	= omap_sync32k_timer_init,
+	.init_time	= omap_init_time,
 	.dt_compat	= omap4_boards_compat,
 	.restart	= omap44xx_restart,
 MACHINE_END
@@ -272,7 +272,7 @@ DT_MACHINE_START(AM43_DT, "Generic AM43 (Flattened Device Tree)")
 	.init_late	= am43xx_init_late,
 	.init_irq	= omap_gic_of_init,
 	.init_machine	= omap_generic_init,
-	.init_time	= omap_sync32k_timer_init,
+	.init_time	= omap_init_time,
 	.dt_compat	= am43_boards_compat,
 	.restart	= omap44xx_restart,
 MACHINE_END
diff --git a/arch/arm/mach-omap2/board-ldp.c b/arch/arm/mach-omap2/board-ldp.c
index 0d3a57c6931f..d9c3ffc39329 100644
--- a/arch/arm/mach-omap2/board-ldp.c
+++ b/arch/arm/mach-omap2/board-ldp.c
@@ -424,6 +424,6 @@ MACHINE_START(OMAP_LDP, "OMAP LDP board")
 	.init_irq	= omap3_init_irq,
 	.init_machine	= omap_ldp_init,
 	.init_late	= omap3430_init_late,
-	.init_time	= omap_sync32k_timer_init,
+	.init_time	= omap_init_time,
 	.restart	= omap3xxx_restart,
 MACHINE_END
diff --git a/arch/arm/mach-omap2/board-rx51.c b/arch/arm/mach-omap2/board-rx51.c
index 830256c434ec..41161ca97d74 100644
--- a/arch/arm/mach-omap2/board-rx51.c
+++ b/arch/arm/mach-omap2/board-rx51.c
@@ -136,6 +136,6 @@ MACHINE_START(NOKIA_RX51, "Nokia RX-51 board")
 	.init_irq	= omap3_init_irq,
 	.init_machine	= rx51_init,
 	.init_late	= omap3430_init_late,
-	.init_time	= omap_sync32k_timer_init,
+	.init_time	= omap_init_time,
 	.restart	= omap3xxx_restart,
 MACHINE_END
diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index bf42fc4e78f4..e1e274334290 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -88,7 +88,7 @@ static inline int omap_mux_late_init(void)
 
 extern void omap2_init_common_infrastructure(void);
 
-extern void omap_sync32k_timer_init(void);
+extern void omap_init_time(void);
 extern void omap3_secure_sync32k_timer_init(void);
 extern void omap3_gptimer_timer_init(void);
 #ifdef CONFIG_CACHE_L2X0
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index f41e526ffa46..01452cb190cb 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -492,7 +492,7 @@ static void __init __omap_sync32k_timer_init(int clkev_nr, const char *clkev_src
 		omap2_sync32k_clocksource_init();
 }
 
-void __init omap_sync32k_timer_init(void)
+void __init omap_init_time(void)
 {
 	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
 			2, "timer_sys_ck", NULL, false);
@@ -635,7 +635,7 @@ sysclk1_based:
 void __init omap5_realtime_timer_init(void)
 {
 	realtime_counter_init();
-	omap_sync32k_timer_init();
+	omap_init_time();
 }
 #endif /* CONFIG_SOC_OMAP5 || CONFIG_SOC_DRA7XX */
 
-- 
2.5.3

[PATCH 09/11] clocksource: add TI 32.768 Hz counter driver

[Felipe Balbi]

Introduce a new clocksource driver for Texas
Instruments 32.768 Hz device which is available
on most OMAP-like devices.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 drivers/clocksource/Kconfig        |   7 +++
 drivers/clocksource/Makefile       |   1 +
 drivers/clocksource/timer-ti-32k.c | 122 +++++++++++++++++++++++++++++++++++++
 3 files changed, 130 insertions(+)
 create mode 100644 drivers/clocksource/timer-ti-32k.c

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index a7726db13abb..98b2a9b9bfad 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -115,6 +115,13 @@ config CLKSRC_PISTACHIO
 	bool
 	select CLKSRC_OF
 
+config CLKSRC_TI_32K
+	bool "Texas Instruments 32.768 Hz Clocksource" if COMPILE_TEST
+	select CLKSRC_OF if OF
+	help
+	  This option enables support for Texas Instruments 32.768 Hz clocksource
+	  available on many OMAP-like platforms.
+
 config CLKSRC_STM32
 	bool "Clocksource for STM32 SoCs" if !ARCH_STM32
 	depends on OF && ARM && (ARCH_STM32 || COMPILE_TEST)
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 5c00863c3e33..749abc3665b3 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_VF_PIT_TIMER)	+= vf_pit_timer.o
 obj-$(CONFIG_CLKSRC_QCOM)	+= qcom-timer.o
 obj-$(CONFIG_MTK_TIMER)		+= mtk_timer.o
 obj-$(CONFIG_CLKSRC_PISTACHIO)	+= time-pistachio.o
+obj-$(CONFIG_CLKSRC_TI_32K)	+= timer-ti-32k.o
 
 obj-$(CONFIG_ARM_ARCH_TIMER)		+= arm_arch_timer.o
 obj-$(CONFIG_ARM_GLOBAL_TIMER)		+= arm_global_timer.o
diff --git a/drivers/clocksource/timer-ti-32k.c b/drivers/clocksource/timer-ti-32k.c
new file mode 100644
index 000000000000..12e2ca7bcc49
--- /dev/null
+++ b/drivers/clocksource/timer-ti-32k.c
@@ -0,0 +1,122 @@
+/**
+ * timer-ti-32k.c - OMAP2 32k Timer Support
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ *
+ * Update to use new clocksource/clockevent layers
+ * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
+ * Copyright (C) 2007 MontaVista Software, Inc.
+ *
+ * Original driver:
+ * Copyright (C) 2005 Nokia Corporation
+ * Author: Paul Mundt <paul.mundt@nokia.com>
+ *         Juha Yrjölä <juha.yrjola@nokia.com>
+ * OMAP Dual-mode timer framework support by Timo Teras
+ *
+ * Some parts based off of TI's 24xx code:
+ *
+ * Copyright (C) 2004-2009 Texas Instruments, Inc.
+ *
+ * Roughly modelled after the OMAP1 MPU timer code.
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2  of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/sched_clock.h>
+#include <linux/clocksource.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+/*
+ * 32KHz clocksource ... always available, on pretty most chips except
+ * OMAP 730 and 1510.  Other timers could be used as clocksources, with
+ * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
+ * but systems won't necessarily want to spend resources that way.
+ */
+
+#define OMAP2_32KSYNCNT_REV_OFF		0x0
+#define OMAP2_32KSYNCNT_REV_SCHEME	(0x3 << 30)
+#define OMAP2_32KSYNCNT_CR_OFF_LOW	0x10
+#define OMAP2_32KSYNCNT_CR_OFF_HIGH	0x30
+
+struct ti_32k {
+	void __iomem		*base;
+	void __iomem		*counter;
+	struct clocksource	cs;
+};
+#define to_ti_32k(cs)	(container_of((cs), struct ti_32k, cs))
+
+static cycle_t ti_32k_read_cycles(struct clocksource *cs)
+{
+	struct ti_32k		*ti = to_ti_32k(cs);
+
+	return (cycle_t)readl_relaxed(ti->counter);
+}
+
+static struct ti_32k ti_32k_timer = {
+	.cs = {
+		.name		= "32k_counter",
+		.rating		= 250,
+		.read		= ti_32k_read_cycles,
+		.mask		= CLOCKSOURCE_MASK(32),
+		.flags		= CLOCK_SOURCE_IS_CONTINUOUS |
+				CLOCK_SOURCE_SUSPEND_NONSTOP,
+	},
+};
+
+static u64 notrace omap_32k_read_sched_clock(void)
+{
+	return ti_32k_read_cycles(&ti_32k_timer.cs);
+}
+
+static void __init ti_32k_timer_init(struct device_node *np)
+{
+	int ret;
+
+	ti_32k_timer.base = of_iomap(np, 0);
+	if (!ti_32k_timer.base) {
+		pr_err("Can't ioremap 32k timer base\n");
+		return;
+	}
+
+	ti_32k_timer.counter = ti_32k_timer.base;
+
+	/*
+	 * 32k sync Counter IP register offsets vary between the highlander
+	 * version and the legacy ones.
+	 *
+	 * The 'SCHEME' bits(30-31) of the revision register is used to identify
+	 * the version.
+	 */
+	if (readl_relaxed(ti_32k_timer.base + OMAP2_32KSYNCNT_REV_OFF) &
+			OMAP2_32KSYNCNT_REV_SCHEME)
+		ti_32k_timer.counter += OMAP2_32KSYNCNT_CR_OFF_HIGH;
+	else
+		ti_32k_timer.counter += OMAP2_32KSYNCNT_CR_OFF_LOW;
+
+	ret = clocksource_register_hz(&ti_32k_timer.cs, 32768);
+	if (ret) {
+		pr_err("32k_counter: can't register clocksource\n");
+		return;
+	}
+
+	sched_clock_register(omap_32k_read_sched_clock, 32, 32768);
+	pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n");
+}
+CLOCKSOURCE_OF_DECLARE(ti_32k_timer, "ti,omap-counter32k",
+		ti_32k_timer_init);
-- 
2.5.3

[PATCH 10/11] arm: omap2+: select 32k clocksource driver

[Felipe Balbi]

Now that we have a 32k clocksource driver, let's
select it for OMAP2PLUS builds.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 arch/arm/mach-omap2/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
index 871d6cc450a5..9ac5909ca59d 100644
--- a/arch/arm/mach-omap2/Kconfig
+++ b/arch/arm/mach-omap2/Kconfig
@@ -99,6 +99,7 @@ config ARCH_OMAP2PLUS
 	select SOC_BUS
 	select TI_PRIV_EDMA
 	select OMAP_IRQCHIP
+	select CLKSRC_TI_32K
 	help
 	  Systems based on OMAP2, OMAP3, OMAP4 or OMAP5
 
-- 
2.5.3

[PATCH 11/11] arm: omap2: timer: limit hwmod usage to non-DT boots

[Felipe Balbi]

now that we have a working 32k clocksource driver,
we can limit HWMOD usage to non-DT boots and rely
on clocksource_of_init() every time we boot
with DT.

While at that, also make sure that we don't disable
the 32-counter device so it gets probed by its driver.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 arch/arm/mach-omap2/timer.c | 33 +++++++++++++--------------------
 1 file changed, 13 insertions(+), 20 deletions(-)

diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 01452cb190cb..7c1b13fee68f 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -183,7 +183,8 @@ static struct device_node * __init omap_get_timer_dt(const struct of_device_id *
 				  of_get_property(np, "ti,timer-secure", NULL)))
 			continue;
 
-		of_add_property(np, &device_disabled);
+		if (!of_device_is_compatible(np, "ti,omap-counter32k"))
+			of_add_property(np, &device_disabled);
 		return np;
 	}
 
@@ -394,7 +395,6 @@ static int __init __maybe_unused omap2_sync32k_clocksource_init(void)
 	int ret;
 	struct device_node *np = NULL;
 	struct omap_hwmod *oh;
-	void __iomem *vbase;
 	const char *oh_name = "counter_32k";
 
 	/*
@@ -420,18 +420,6 @@ static int __init __maybe_unused omap2_sync32k_clocksource_init(void)
 
 	omap_hwmod_setup_one(oh_name);
 
-	if (np) {
-		vbase = of_iomap(np, 0);
-		of_node_put(np);
-	} else {
-		vbase = omap_hwmod_get_mpu_rt_va(oh);
-	}
-
-	if (!vbase) {
-		pr_warn("%s: failed to get counter_32k resource\n", __func__);
-		return -ENXIO;
-	}
-
 	ret = omap_hwmod_enable(oh);
 	if (ret) {
 		pr_warn("%s: failed to enable counter_32k module (%d)\n",
@@ -439,13 +427,18 @@ static int __init __maybe_unused omap2_sync32k_clocksource_init(void)
 		return ret;
 	}
 
-	ret = omap_init_clocksource_32k(vbase);
-	if (ret) {
-		pr_warn("%s: failed to initialize counter_32k as a clocksource (%d)\n",
-							__func__, ret);
-		omap_hwmod_idle(oh);
-	}
+	if (!of_have_populated_dt()) {
+		void __iomem *vbase;
 
+		vbase = omap_hwmod_get_mpu_rt_va(oh);
+
+		ret = omap_init_clocksource_32k(vbase);
+		if (ret) {
+			pr_warn("%s: failed to initialize counter_32k as a clocksource (%d)\n",
+					__func__, ret);
+			omap_hwmod_idle(oh);
+		}
+	}
 	return ret;
 }
 
-- 
2.5.3

Re: [PATCH 04/11] arm: omap2: timer: provide generic sync32k_timer_init function

[Suman Anna]

On 10/06/2015 12:02 PM, Balbi, Felipe wrote:
> instead of constantly defining a small wrapper
> around __omap_sync32k_timer_init(), let's define
> a generic one which can be used by all OMAPs.
> 
> Signed-off-by: Felipe Balbi <balbi@ti.com>
> ---
>  arch/arm/mach-omap2/board-generic.c | 10 +++++-----
>  arch/arm/mach-omap2/board-ldp.c     |  2 +-
>  arch/arm/mach-omap2/board-rx51.c    |  2 +-
>  arch/arm/mach-omap2/common.h        |  3 +--
>  arch/arm/mach-omap2/timer.c         | 20 +++-----------------
>  5 files changed, 11 insertions(+), 26 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
> index 9df14ed7dab1..871db0f0fa66 100644
> --- a/arch/arm/mach-omap2/board-generic.c
> +++ b/arch/arm/mach-omap2/board-generic.c
> @@ -46,7 +46,7 @@ DT_MACHINE_START(OMAP242X_DT, "Generic OMAP2420 (Flattened Device Tree)")
>  	.map_io		= omap242x_map_io,
>  	.init_early	= omap2420_init_early,
>  	.init_machine	= omap_generic_init,
> -	.init_time	= omap2_sync32k_timer_init,
> +	.init_time	= omap_sync32k_timer_init,
>  	.dt_compat	= omap242x_boards_compat,
>  	.restart	= omap2xxx_restart,
>  MACHINE_END
> @@ -63,7 +63,7 @@ DT_MACHINE_START(OMAP243X_DT, "Generic OMAP2430 (Flattened Device Tree)")
>  	.map_io		= omap243x_map_io,
>  	.init_early	= omap2430_init_early,
>  	.init_machine	= omap_generic_init,
> -	.init_time	= omap2_sync32k_timer_init,
> +	.init_time	= omap_sync32k_timer_init,
>  	.dt_compat	= omap243x_boards_compat,
>  	.restart	= omap2xxx_restart,
>  MACHINE_END
> @@ -82,7 +82,7 @@ DT_MACHINE_START(OMAP3_N900_DT, "Nokia RX-51 board")
>  	.init_early	= omap3430_init_early,
>  	.init_machine	= omap_generic_init,
>  	.init_late	= omap3_init_late,
> -	.init_time	= omap3_sync32k_timer_init,
> +	.init_time	= omap_sync32k_timer_init,
>  	.dt_compat	= n900_boards_compat,
>  	.restart	= omap3xxx_restart,
>  MACHINE_END
> @@ -100,7 +100,7 @@ DT_MACHINE_START(OMAP3_DT, "Generic OMAP3 (Flattened Device Tree)")
>  	.init_early	= omap3430_init_early,
>  	.init_machine	= omap_generic_init,
>  	.init_late	= omap3_init_late,
> -	.init_time	= omap3_sync32k_timer_init,
> +	.init_time	= omap_sync32k_timer_init,
>  	.dt_compat	= omap3_boards_compat,
>  	.restart	= omap3xxx_restart,
>  MACHINE_END
> @@ -116,7 +116,7 @@ DT_MACHINE_START(OMAP36XX_DT, "Generic OMAP36xx (Flattened Device Tree)")
>  	.init_early	= omap3630_init_early,
>  	.init_machine	= omap_generic_init,
>  	.init_late	= omap3_init_late,
> -	.init_time	= omap3_sync32k_timer_init,
> +	.init_time	= omap_sync32k_timer_init,
>  	.dt_compat	= omap36xx_boards_compat,
>  	.restart	= omap3xxx_restart,
>  MACHINE_END
> diff --git a/arch/arm/mach-omap2/board-ldp.c b/arch/arm/mach-omap2/board-ldp.c
> index c2975af4cd5d..0d3a57c6931f 100644
> --- a/arch/arm/mach-omap2/board-ldp.c
> +++ b/arch/arm/mach-omap2/board-ldp.c
> @@ -424,6 +424,6 @@ MACHINE_START(OMAP_LDP, "OMAP LDP board")
>  	.init_irq	= omap3_init_irq,
>  	.init_machine	= omap_ldp_init,
>  	.init_late	= omap3430_init_late,
> -	.init_time	= omap3_sync32k_timer_init,
> +	.init_time	= omap_sync32k_timer_init,
>  	.restart	= omap3xxx_restart,
>  MACHINE_END
> diff --git a/arch/arm/mach-omap2/board-rx51.c b/arch/arm/mach-omap2/board-rx51.c
> index 2d1e5a6beb85..830256c434ec 100644
> --- a/arch/arm/mach-omap2/board-rx51.c
> +++ b/arch/arm/mach-omap2/board-rx51.c
> @@ -136,6 +136,6 @@ MACHINE_START(NOKIA_RX51, "Nokia RX-51 board")
>  	.init_irq	= omap3_init_irq,
>  	.init_machine	= rx51_init,
>  	.init_late	= omap3430_init_late,
> -	.init_time	= omap3_sync32k_timer_init,
> +	.init_time	= omap_sync32k_timer_init,
>  	.restart	= omap3xxx_restart,
>  MACHINE_END
> diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
> index 92e92cfc2775..844ad031f7f0 100644
> --- a/arch/arm/mach-omap2/common.h
> +++ b/arch/arm/mach-omap2/common.h
> @@ -88,8 +88,7 @@ static inline int omap_mux_late_init(void)
>  
>  extern void omap2_init_common_infrastructure(void);
>  
> -extern void omap2_sync32k_timer_init(void);
> -extern void omap3_sync32k_timer_init(void);
> +extern void omap_sync32k_timer_init(void);
>  extern void omap3_secure_sync32k_timer_init(void);
>  extern void omap3_gptimer_timer_init(void);
>  extern void omap4_local_timer_init(void);
> diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
> index 976ff9fa3594..d14e25b2d7a4 100644
> --- a/arch/arm/mach-omap2/timer.c
> +++ b/arch/arm/mach-omap2/timer.c
> @@ -608,21 +608,13 @@ static void __init __omap_sync32k_timer_init(int clkev_nr, const char *clkev_src
>  		omap2_sync32k_clocksource_init();
>  }
>  
> -#ifdef CONFIG_ARCH_OMAP2
> -void __init omap2_sync32k_timer_init(void)
> +void __init omap_sync32k_timer_init(void)
>  {
>  	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
>  			2, "timer_sys_ck", NULL, false);
>  }
> -#endif /* CONFIG_ARCH_OMAP2 */
>  
>  #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM43XX)
> -void __init omap3_sync32k_timer_init(void)
> -{
> -	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
> -			2, "timer_sys_ck", NULL, false);
> -}
> -
>  void __init omap3_secure_sync32k_timer_init(void)
>  {
>  	__omap_sync32k_timer_init(12, "secure_32k_fck", "ti,timer-secure",
> @@ -640,15 +632,9 @@ void __init omap3_gptimer_timer_init(void)
>  
>  #if defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_SOC_OMAP5) || \
>  	defined(CONFIG_SOC_DRA7XX) || defined(CONFIG_SOC_AM43XX)
> -static void __init omap4_sync32k_timer_init(void)
> -{
> -	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
> -			2, "sys_clkin_ck", NULL, false);
> -}
> -
>  void __init omap4_local_timer_init(void)
>  {
> -	omap4_sync32k_timer_init();
> +	omap_sync32k_timer_init();

Hmm, this is changing the parent clock source for the timer from
sys_clkin_ck to timer_sys_ck for OMAP4 and OMAP5 below. I am not sure of
the history behind the parent source, but is this what you intended to
do here.

regards
Suman

>  	clocksource_of_init();
>  }
>  #endif
> @@ -656,7 +642,7 @@ void __init omap4_local_timer_init(void)
>  #if defined(CONFIG_SOC_OMAP5) || defined(CONFIG_SOC_DRA7XX)
>  void __init omap5_realtime_timer_init(void)
>  {
> -	omap4_sync32k_timer_init();
> +	omap_sync32k_timer_init();
>  	realtime_counter_init();
>  
>  	clocksource_of_init();
> 

Re: [PATCH 04/11] arm: omap2: timer: provide generic sync32k_timer_init function

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 1877 bytes --]


Hi,

Suman Anna <s-anna@ti.com> writes:
>> diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
>> index 976ff9fa3594..d14e25b2d7a4 100644
>> --- a/arch/arm/mach-omap2/timer.c
>> +++ b/arch/arm/mach-omap2/timer.c
>> @@ -608,21 +608,13 @@ static void __init __omap_sync32k_timer_init(int clkev_nr, const char *clkev_src
>>  		omap2_sync32k_clocksource_init();
>>  }
>>  
>> -#ifdef CONFIG_ARCH_OMAP2
>> -void __init omap2_sync32k_timer_init(void)
>> +void __init omap_sync32k_timer_init(void)
>>  {
>>  	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
>>  			2, "timer_sys_ck", NULL, false);
>>  }
>> -#endif /* CONFIG_ARCH_OMAP2 */
>>  
>>  #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM43XX)
>> -void __init omap3_sync32k_timer_init(void)
>> -{
>> -	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
>> -			2, "timer_sys_ck", NULL, false);
>> -}
>> -
>>  void __init omap3_secure_sync32k_timer_init(void)
>>  {
>>  	__omap_sync32k_timer_init(12, "secure_32k_fck", "ti,timer-secure",
>> @@ -640,15 +632,9 @@ void __init omap3_gptimer_timer_init(void)
>>  
>>  #if defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_SOC_OMAP5) || \
>>  	defined(CONFIG_SOC_DRA7XX) || defined(CONFIG_SOC_AM43XX)
>> -static void __init omap4_sync32k_timer_init(void)
>> -{
>> -	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
>> -			2, "sys_clkin_ck", NULL, false);
>> -}
>> -
>>  void __init omap4_local_timer_init(void)
>>  {
>> -	omap4_sync32k_timer_init();
>> +	omap_sync32k_timer_init();
>
> Hmm, this is changing the parent clock source for the timer from
> sys_clkin_ck to timer_sys_ck for OMAP4 and OMAP5 below. I am not sure of
> the history behind the parent source, but is this what you intended to
> do here.

good catch. I'll fix this for next revision

-- 
balbi

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 818 bytes --]

Re: [PATCH 09/11] clocksource: add TI 32.768 Hz counter driver

[Daniel Lezcano]

On 10/06/2015 07:02 PM, Felipe Balbi wrote:
> Introduce a new clocksource driver for Texas
> Instruments 32.768 Hz device which is available
> on most OMAP-like devices.
>
> Signed-off-by: Felipe Balbi <balbi@ti.com>

Hi Felipe,

With the couple of nits below fixed, you can my:

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>

[ ... ]

> +#define OMAP2_32KSYNCNT_REV_OFF		0x0
> +#define OMAP2_32KSYNCNT_REV_SCHEME	(0x3 << 30)
> +#define OMAP2_32KSYNCNT_CR_OFF_LOW	0x10
> +#define OMAP2_32KSYNCNT_CR_OFF_HIGH	0x30
> +
> +struct ti_32k {
> +	void __iomem		*base;
> +	void __iomem		*counter;
> +	struct clocksource	cs;
> +};
> +#define to_ti_32k(cs)	(container_of((cs), struct ti_32k, cs))

Usually a static inline is used instead of a macro for that.

> +static cycle_t ti_32k_read_cycles(struct clocksource *cs)
> +{
> +	struct ti_32k		*ti = to_ti_32k(cs);

format


-- 
  <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog

Re: [PATCH 09/11] clocksource: add TI 32.768 Hz counter driver

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 1166 bytes --]


Hi,

Daniel Lezcano <daniel.lezcano@linaro.org> writes:

> On 10/06/2015 07:02 PM, Felipe Balbi wrote:
>> Introduce a new clocksource driver for Texas
>> Instruments 32.768 Hz device which is available
>> on most OMAP-like devices.
>>
>> Signed-off-by: Felipe Balbi <balbi@ti.com>
>
> Hi Felipe,
>
> With the couple of nits below fixed, you can my:
>
> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
>
> [ ... ]
>
>> +#define OMAP2_32KSYNCNT_REV_OFF		0x0
>> +#define OMAP2_32KSYNCNT_REV_SCHEME	(0x3 << 30)
>> +#define OMAP2_32KSYNCNT_CR_OFF_LOW	0x10
>> +#define OMAP2_32KSYNCNT_CR_OFF_HIGH	0x30
>> +
>> +struct ti_32k {
>> +	void __iomem		*base;
>> +	void __iomem		*counter;
>> +	struct clocksource	cs;
>> +};
>> +#define to_ti_32k(cs)	(container_of((cs), struct ti_32k, cs))
>
> Usually a static inline is used instead of a macro for that.

not so true and also completely unnecessary, considering container_of()
already type safety ;-)

Try this:

$ git grep -e "#define.*container_of" | wc -l

no strong feelings though. I tend to prefer a macro to wrap
container_of() but won't go into an argument

-- 
balbi

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 818 bytes --]

Re: [PATCH 09/11] clocksource: add TI 32.768 Hz counter driver

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 727 bytes --]

Hi Felipe,

[auto build test ERROR on omap/for-next -- if it's inappropriate base, please suggest rules for selecting the more suitable base]

url:    https://github.com/0day-ci/linux/commits/Felipe-Balbi/arm-omap-timer-cleanups/20151017-002649
config: i386-allmodconfig (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `ti_32k_timer_init':
>> timer-ti-32k.c:(.init.text+0x213a6): undefined reference to `sched_clock_register'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/octet-stream, Size: 51600 bytes --]

[PATCH 09/11] clocksource: add TI 32.768 Hz counter driver

[Felipe Balbi]

Introduce a new clocksource driver for Texas
Instruments 32.768 Hz device which is available
on most OMAP-like devices.

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 drivers/clocksource/Kconfig        |   7 +++
 drivers/clocksource/Makefile       |   1 +
 drivers/clocksource/timer-ti-32k.c | 126 +++++++++++++++++++++++++++++++++++++
 3 files changed, 134 insertions(+)
 create mode 100644 drivers/clocksource/timer-ti-32k.c

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index a7726db13abb..98b2a9b9bfad 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -115,6 +115,13 @@ config CLKSRC_PISTACHIO
 	bool
 	select CLKSRC_OF
 
+config CLKSRC_TI_32K
+	bool "Texas Instruments 32.768 Hz Clocksource" if COMPILE_TEST
+	select CLKSRC_OF if OF
+	help
+	  This option enables support for Texas Instruments 32.768 Hz clocksource
+	  available on many OMAP-like platforms.
+
 config CLKSRC_STM32
 	bool "Clocksource for STM32 SoCs" if !ARCH_STM32
 	depends on OF && ARM && (ARCH_STM32 || COMPILE_TEST)
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 5c00863c3e33..749abc3665b3 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_VF_PIT_TIMER)	+= vf_pit_timer.o
 obj-$(CONFIG_CLKSRC_QCOM)	+= qcom-timer.o
 obj-$(CONFIG_MTK_TIMER)		+= mtk_timer.o
 obj-$(CONFIG_CLKSRC_PISTACHIO)	+= time-pistachio.o
+obj-$(CONFIG_CLKSRC_TI_32K)	+= timer-ti-32k.o
 
 obj-$(CONFIG_ARM_ARCH_TIMER)		+= arm_arch_timer.o
 obj-$(CONFIG_ARM_GLOBAL_TIMER)		+= arm_global_timer.o
diff --git a/drivers/clocksource/timer-ti-32k.c b/drivers/clocksource/timer-ti-32k.c
new file mode 100644
index 000000000000..8518d9dfba5c
--- /dev/null
+++ b/drivers/clocksource/timer-ti-32k.c
@@ -0,0 +1,126 @@
+/**
+ * timer-ti-32k.c - OMAP2 32k Timer Support
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ *
+ * Update to use new clocksource/clockevent layers
+ * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
+ * Copyright (C) 2007 MontaVista Software, Inc.
+ *
+ * Original driver:
+ * Copyright (C) 2005 Nokia Corporation
+ * Author: Paul Mundt <paul.mundt@nokia.com>
+ *         Juha Yrjölä <juha.yrjola@nokia.com>
+ * OMAP Dual-mode timer framework support by Timo Teras
+ *
+ * Some parts based off of TI's 24xx code:
+ *
+ * Copyright (C) 2004-2009 Texas Instruments, Inc.
+ *
+ * Roughly modelled after the OMAP1 MPU timer code.
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2  of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/sched_clock.h>
+#include <linux/clocksource.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+/*
+ * 32KHz clocksource ... always available, on pretty most chips except
+ * OMAP 730 and 1510.  Other timers could be used as clocksources, with
+ * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
+ * but systems won't necessarily want to spend resources that way.
+ */
+
+#define OMAP2_32KSYNCNT_REV_OFF		0x0
+#define OMAP2_32KSYNCNT_REV_SCHEME	(0x3 << 30)
+#define OMAP2_32KSYNCNT_CR_OFF_LOW	0x10
+#define OMAP2_32KSYNCNT_CR_OFF_HIGH	0x30
+
+struct ti_32k {
+	void __iomem		*base;
+	void __iomem		*counter;
+	struct clocksource	cs;
+};
+
+static inline struct ti_32k *to_ti_32k(struct clocksource *cs)
+{
+	return container_of(cs, struct ti_32k, cs);
+}
+
+static cycle_t ti_32k_read_cycles(struct clocksource *cs)
+{
+	struct ti_32k *ti = to_ti_32k(cs);
+
+	return (cycle_t)readl_relaxed(ti->counter);
+}
+
+static struct ti_32k ti_32k_timer = {
+	.cs = {
+		.name		= "32k_counter",
+		.rating		= 250,
+		.read		= ti_32k_read_cycles,
+		.mask		= CLOCKSOURCE_MASK(32),
+		.flags		= CLOCK_SOURCE_IS_CONTINUOUS |
+				CLOCK_SOURCE_SUSPEND_NONSTOP,
+	},
+};
+
+static u64 notrace omap_32k_read_sched_clock(void)
+{
+	return ti_32k_read_cycles(&ti_32k_timer.cs);
+}
+
+static void __init ti_32k_timer_init(struct device_node *np)
+{
+	int ret;
+
+	ti_32k_timer.base = of_iomap(np, 0);
+	if (!ti_32k_timer.base) {
+		pr_err("Can't ioremap 32k timer base\n");
+		return;
+	}
+
+	ti_32k_timer.counter = ti_32k_timer.base;
+
+	/*
+	 * 32k sync Counter IP register offsets vary between the highlander
+	 * version and the legacy ones.
+	 *
+	 * The 'SCHEME' bits(30-31) of the revision register is used to identify
+	 * the version.
+	 */
+	if (readl_relaxed(ti_32k_timer.base + OMAP2_32KSYNCNT_REV_OFF) &
+			OMAP2_32KSYNCNT_REV_SCHEME)
+		ti_32k_timer.counter += OMAP2_32KSYNCNT_CR_OFF_HIGH;
+	else
+		ti_32k_timer.counter += OMAP2_32KSYNCNT_CR_OFF_LOW;
+
+	ret = clocksource_register_hz(&ti_32k_timer.cs, 32768);
+	if (ret) {
+		pr_err("32k_counter: can't register clocksource\n");
+		return;
+	}
+
+	sched_clock_register(omap_32k_read_sched_clock, 32, 32768);
+	pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n");
+}
+CLOCKSOURCE_OF_DECLARE(ti_32k_timer, "ti,omap-counter32k",
+		ti_32k_timer_init);
-- 
2.5.3