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counter: microchip-tcb-capture: Add watch validation support

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The Timer Counter Block (TCB) exposes several kinds of events to the
Counter framework, but not every event is meaningful on every hardware
channel. Add a `watch_validate()` callback so userspace may register only
the combinations actually supported:

* Channel 0 (COUNTER_MCHP_EVCHN_CV, COUNTER_MCHP_EVCHN_RA)
   - COUNTER_EVENT_CAPTURE
   - COUNTER_EVENT_CHANGE_OF_STATE
   - COUNTER_EVENT_OVERFLOW

* Channel 1 (COUNTER_MCHP_EVCHN_RB)
   - COUNTER_EVENT_CAPTURE

* Channel 2 (COUNTER_MCHP_EVCHN_RC)
   - COUNTER_EVENT_THRESHOLD

Any other request is rejected with `-EINVAL`.

Signed-off-by: Dharma Balasubiramani <dharma.b@microchip.com>
Link: https://lore.kernel.org/r/20250520-counter-tcb-v3-1-4631e2aff7ed@microchip.com
Signed-off-by: William Breathitt Gray <wbg@kernel.org>
This commit is contained in:
Dharma Balasubiramani 2025-05-20 20:51:46 +05:30 committed by William Breathitt Gray
parent ace2cd11a2
commit ae3392c0f1
1 changed files with 24 additions and 1 deletions
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25
drivers/counter/microchip-tcb-capture.c
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@ -337,6 +337,28 @@ static struct counter_comp mchp_tc_count_ext[] = {
COUNTER_COMP_COMPARE(mchp_tc_count_compare_read, mchp_tc_count_compare_write),
};
static int mchp_tc_watch_validate(struct counter_device *counter,
const struct counter_watch *watch)
{
if (watch->channel == COUNTER_MCHP_EVCHN_CV || watch->channel == COUNTER_MCHP_EVCHN_RA)
switch (watch->event) {
case COUNTER_EVENT_CHANGE_OF_STATE:
case COUNTER_EVENT_OVERFLOW:
case COUNTER_EVENT_CAPTURE:
return 0;
default:
return -EINVAL;
}
if (watch->channel == COUNTER_MCHP_EVCHN_RB && watch->event == COUNTER_EVENT_CAPTURE)
return 0;
if (watch->channel == COUNTER_MCHP_EVCHN_RC && watch->event == COUNTER_EVENT_THRESHOLD)
return 0;
return -EINVAL;
}
static struct counter_count mchp_tc_counts[] = {
{
.id = 0,
@ -356,7 +378,8 @@ static const struct counter_ops mchp_tc_ops = {
.function_read = mchp_tc_count_function_read,
.function_write = mchp_tc_count_function_write,
.action_read = mchp_tc_count_action_read,
.action_write = mchp_tc_count_action_write
.action_write = mchp_tc_count_action_write,
.watch_validate = mchp_tc_watch_validate,
};
static const struct atmel_tcb_config tcb_rm9200_config = {