On 11/25/2015 03:51 PM, Vladimir Murzin wrote:
Hi Daniel,
Thanks for you review, I agree on all concerns raised and address them
in the next version. Just some points to confirm below (I left only
relevant parts).
+static irqreturn_t mps2_timer_interrupt(int irq, void *dev_id)
+{
+ struct clockevent_mps2 *ce = dev_id;
+ u32 status = readl(ce->reg + TIMER_INT);
+
+ if (!status)
+ return IRQ_NONE;
Why that could happen ? Add a comment.
Sort of defensive programming, I never seen it happens, but just in case
of spurious interrupts... Do you prefer to get rid of this check or
/* spurious interrupt? */
if (!status)
return IRQ_NONE;
would be fine to you?
Yes, that would be fine, but if it does never happen, we don't really
need this check. If you prefer to make sure there isn't a spurious
interrupt and considering it shouldn't happen, a pr_info trace may help
to spot this misbehavior.
+}
+
+static void __init mps2_timer_init(struct device_node *np)
+{
+ static int clksrc;
+
+ if (!clksrc && !mps2_clocksource_init(np))
+ clksrc = 1;
+ else
+ mps2_clockevents_init(np);
That assumes the clocksource is defined before the clockevents in the
DT. If it is not the case, the mps2_clocksource_init will fail (and spit
errors) and mps2_clockevents_init() won't be called.
Does following (stolen from efm32) look better to you?
static void __init mps2_timer_init(struct device_node *np)
{
static int has_clocksource, has_clockevent;
int ret;
if (!has_clocksource) {
ret = mps2_clocksource_init(np);
if (!ret) {
has_clocksource = 1;
return;
}
}
if (!has_clockevent) {
ret = mps2_clockevent_init(np);
if (!ret) {
has_clockevent = 1;
return;
}
}
}
Yes.
I don't like to have a "CLOCKSOURCE_OF_DECLARE" to initialize a
clockevent but I can't blame you, this is what is done in the other drivers.
+}
+
+CLOCKSOURCE_OF_DECLARE(mps2_timer, "arm,mps2-timer", mps2_timer_init);
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