[PATCH v6] counter: Introduce the COUNTER_COMP_FREQUENCY() macro

[Fabrice Gasnier]

Now that there are two users for the "frequency" extension, introduce a
new COUNTER_COMP_FREQUENCY() macro.
This extension is intended to be a read-only signal attribute.

Suggested-by: William Breathitt Gray <william.gray@xxxxxxxxxx>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxxxxxxx>
---
Changes in v6
- use COUNTER_COMP_SIGNAL_U64() helper macro.

Changes in v5
- "frequency" extension is read-only, so there's no need to provide
  a write parameter.
- patch sent separately from "counter: Add stm32 timer events support" [1]
[1] https://lore.kernel.org/lkml/20240227173803.53906-2-fabrice.gasnier@xxxxxxxxxxx/
---
 include/linux/counter.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/counter.h b/include/linux/counter.h
index 702e9108bbb4..ac36f6e799f6 100644
--- a/include/linux/counter.h
+++ b/include/linux/counter.h
@@ -602,6 +602,9 @@ struct counter_array {
 #define COUNTER_COMP_FLOOR(_read, _write) \
 	COUNTER_COMP_COUNT_U64("floor", _read, _write)
 
+#define COUNTER_COMP_FREQUENCY(_read) \
+	COUNTER_COMP_SIGNAL_U64("frequency", _read, NULL)
+
 #define COUNTER_COMP_POLARITY(_read, _write, _available) \
 { \
 	.type = COUNTER_COMP_SIGNAL_POLARITY, \
-- 
2.25.1