clockevents: misc: migrate to ->set_dev_mode()

Clockevents core now supports ->set_dev_mode() (as a replacement to
->set_mode()), with capability to return error codes.

This patch migrates clockevent drivers for all architectures that had a single
clockevent driver (in order to limit patch count).

Drivers now return -ENOSYS when a unsupported mode is passed to their
->set_dev_mode() callbacks and return 0 on success.

Most of the changes are automated with help of Coccinelle
(http://coccinelle.lip6.fr/) and the ones left are around the switch block which
are handled manually.

Some drivers had a WARN()/BUG()/pr_err()/empty-implementation for unsupported
modes. These statements and unsupported modes are removed now as proper error
handling with a WARN_ON() is done at clockevents core.

A simplified version of the semantic patch is:

@@
identifier m,c,setmode;
@@
-void
+int
setmode(enum clock_event_mode m, struct clock_event_device *c);

@@
identifier setmode;
@@
-void
+int
setmode(enum clock_event_mode, struct clock_event_device *);

@fixret@
identifier m,c,setmode;
@@
-void
+int
setmode(enum clock_event_mode m, struct clock_event_device *c)
 {
 ...
+ return 0;
 }

@depends on fixret@
identifier ced;
identifier fixret.setmode;
@@
... struct clock_event_device ced = {
...,
-.set_mode
+.set_dev_mode
= setmode,
};

@depends on fixret@
expression ced;
identifier fixret.setmode;
@@
- ced->set_mode
+ ced->set_dev_mode
= setmode

@depends on fixret@
identifier fixret.setmode;
@@
{
.
-set_mode
+set_dev_mode
= setmode
}

@depends on fixret@
expression ced;
identifier fixret.setmode;
@@
- ced.set_mode
+ ced.set_dev_mode
= setmode

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
[
Backported viresh branch tick/oneshot-stopped.
applied below file manually
	- arch/powerpc/kernel/time.c
]
Signed-off-by: Santosh Shukla <santosh.shukla@linaro.org>

1 files changed, 5 insertions, 2 deletions

diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
index fb0c61443f19..35a512f67be2 100644
--- a/arch/microblaze/kernel/timer.c
+++ b/arch/microblaze/kernel/timer.c
@@ -98,7 +98,7 @@ static int xilinx_timer_set_next_event(unsigned long delta,
 	return 0;
 }
 
-static void xilinx_timer_set_mode(enum clock_event_mode mode,
+static int xilinx_timer_set_mode(enum clock_event_mode mode,
 				struct clock_event_device *evt)
 {
 	switch (mode) {
@@ -119,7 +119,10 @@ static void xilinx_timer_set_mode(enum clock_event_mode mode,
 	case CLOCK_EVT_MODE_RESUME:
 		pr_info("%s: resume\n", __func__);
 		break;
+	default:
+		return -ENOSYS;
 	}
+	return 0;
 }
 
 static struct clock_event_device clockevent_xilinx_timer = {
@@ -128,7 +131,7 @@ static struct clock_event_device clockevent_xilinx_timer = {
 	.shift		= 8,
 	.rating		= 300,
 	.set_next_event	= xilinx_timer_set_next_event,
-	.set_mode	= xilinx_timer_set_mode,
+	.set_dev_mode	= xilinx_timer_set_mode,
 };
 
 static inline void timer_ack(void)