On 08/28/13 00:19, Sören Brinkmann wrote:
On Tue, Aug 27, 2013 at 11:27:55PM +0200, Sebastian Hesselbarth wrote:
Most DT ARM machs require common clock providers initialized before timers.
Currently, arch/arm machs use .init_time to call clk_of_init right before
clocksource_of_init. This prevents to remove that hook and use the default
hook instead. clk_of_init is safe to call for non-DT platforms, so add
the call to ARM arch time_init by default. While at it, also reorder includes
alphabetically.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
---
Changelog:
v1->v2:
- reorder includes alphabetically
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: linux-tegra@xxxxxxxxxxxxxxx
Cc: kernel@xxxxxxxxxxx
Cc: linux-samsung-soc@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
arch/arm/kernel/time.c | 24 ++++++++++++++----------
1 files changed, 14 insertions(+), 10 deletions(-)
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 98aee32..dd1028e 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -11,25 +11,26 @@
[ ... ]
void __init time_init(void)
{
+ /* initalize common clocks before timers */
+ of_clk_init(NULL);
+
if (machine_desc->init_time)
machine_desc->init_time();
else
This forces zynq to move some initialization our clock code relies on to
init_irq(). Also, the current code already takes an approach of
doing either common init or machine specific init.
Soeren,
you know that patch 16/16 takes care of zynq's clock init?
It's your own patch you provided from the last RFC. Looking at it, it
moves zynq_sclr_init() to .init_irq and removes the call to
of_clk_init() from zynq_clock_init() which is called by
zynq_sclr_init().
Isn't that solving the above issues for mach-zynq?
I think it might be better to move the call to of_clk_init() down into
the else branch of the if-else.
Possibly, yes. But we could also unconditionally call of_clk_init() at
the beginning of time_init() and call clocksource_of_init() at the end.
That will make .init_time() to some fixup hook between initialization of
clocks and timers.
Though, this probably contradicts the purpose of the whole series.
Hmm, the purpose was to allow most platforms to remove a custom
.init_time hook only calling of_clk_init() and clocksource_of_init().
If we move of_clk_init() above also in the else-branch the purpose
is still met.
Sebastian
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