From e78630fc405db36722981174011f8457c718be78 Mon Sep 17 00:00:00 2001
From: Marian Buschsieweke <marian.buschsieweke@ovgu.de>
Date: Mon, 19 Apr 2021 21:43:45 +0200
Subject: [PATCH] cpu/atmega_common: implement periph_timer_query_freqs

---
 cpu/atmega_common/Kconfig           |  3 ++-
 cpu/atmega_common/Makefile.features |  3 ++-
 cpu/atmega_common/periph/timer.c    | 18 ++++++++++++++++++
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/cpu/atmega_common/Kconfig b/cpu/atmega_common/Kconfig
index 810df57a4f..efc2f9beba 100644
--- a/cpu/atmega_common/Kconfig
+++ b/cpu/atmega_common/Kconfig
@@ -25,9 +25,10 @@ config CPU_COMMON_ATMEGA
     select HAS_PERIPH_GPIO_LL_IRQ_UNMASK
     select HAS_PERIPH_PM
     select HAS_PERIPH_RTC_MS
+    select HAS_PERIPH_RTT_OVERFLOW
     select HAS_PERIPH_RTT_SET_COUNTER
     select HAS_PERIPH_TIMER_PERIODIC
-    select HAS_PERIPH_RTT_OVERFLOW
+    select HAS_PERIPH_TIMER_QUERY_FREQS
     select HAS_PERIPH_WDT
     select HAS_PUF_SRAM
 
diff --git a/cpu/atmega_common/Makefile.features b/cpu/atmega_common/Makefile.features
index 42bd92dc22..607d875bed 100644
--- a/cpu/atmega_common/Makefile.features
+++ b/cpu/atmega_common/Makefile.features
@@ -13,9 +13,10 @@ FEATURES_PROVIDED += periph_gpio_ll_irq_level_triggered_low
 FEATURES_PROVIDED += periph_gpio_ll_irq_unmask
 FEATURES_PROVIDED += periph_pm
 FEATURES_PROVIDED += periph_rtc_ms
+FEATURES_PROVIDED += periph_rtt_overflow
 FEATURES_PROVIDED += periph_rtt_set_counter
 FEATURES_PROVIDED += periph_timer_periodic
-FEATURES_PROVIDED += periph_rtt_overflow
+FEATURES_PROVIDED += periph_timer_query_freqs
 FEATURES_PROVIDED += periph_wdt
 FEATURES_PROVIDED += puf_sram
 ifneq (atmega8, $(CPU_FAM))
diff --git a/cpu/atmega_common/periph/timer.c b/cpu/atmega_common/periph/timer.c
index 0ab54a394c..374f8d6d30 100644
--- a/cpu/atmega_common/periph/timer.c
+++ b/cpu/atmega_common/periph/timer.c
@@ -318,6 +318,24 @@ void timer_start(tim_t tim)
     ctx[tim].dev->CRB = ctx[tim].mode;
 }
 
+uword_t timer_query_freqs_numof(tim_t dev)
+{
+    (void) dev;
+
+    return ARRAY_SIZE(prescalers);
+}
+
+uint32_t timer_query_freqs(tim_t dev, uword_t index)
+{
+    (void)dev;
+
+    if (index >= ARRAY_SIZE(prescalers)) {
+        return 0;
+    }
+
+    return CLOCK_CORECLOCK >> prescalers[index];
+}
+
 #ifdef TIMER_NUMOF
 static inline void _isr(tim_t tim, int chan)
 {