diff --git a/doc/guides/eventdevs/cnxk.rst b/doc/guides/eventdevs/cnxk.rst
index 53560d3830..18540dc911 100644
--- a/doc/guides/eventdevs/cnxk.rst
+++ b/doc/guides/eventdevs/cnxk.rst
@@ -164,6 +164,24 @@ Runtime Config Options
 
     -a 0002:0e:00.0,tim_ring_ctl=[2-1023-1-0]
 
+- ``TIM external clock frequency``
+
+  The ``tim_eclk_freq`` devagrs can be used to pass external clock frequencies
+  when external clock source is selected.
+
+  External clock frequencies are mapped as follows::
+
+    RTE_EVENT_TIMER_ADAPTER_EXT_CLK0 = TIM_CLK_SRC_10NS,
+    RTE_EVENT_TIMER_ADAPTER_EXT_CLK1 = TIM_CLK_SRC_GPIO,
+    RTE_EVENT_TIMER_ADAPTER_EXT_CLK2 = TIM_CLK_SRC_PTP,
+    RTE_EVENT_TIMER_ADAPTER_EXT_CLK3 = TIM_CLK_SRC_SYNCE
+
+  The order of frequencies supplied to device args should be GPIO-PTP-SYNCE.
+
+  For Example::
+
+    -a 0002:0e:00.0,tim_eclk_freq=122880000-1000000000-0
+
 Debugging Options
 -----------------
 
diff --git a/drivers/common/cnxk/roc_platform.h b/drivers/common/cnxk/roc_platform.h
index 285b24b82d..7e73972b80 100644
--- a/drivers/common/cnxk/roc_platform.h
+++ b/drivers/common/cnxk/roc_platform.h
@@ -43,6 +43,7 @@
 #define PLT_MAX			 RTE_MAX
 #define PLT_DIM			 RTE_DIM
 #define PLT_SET_USED		 RTE_SET_USED
+#define PLT_SWAP		 RTE_SWAP
 #define PLT_STATIC_ASSERT(s)	 _Static_assert(s, #s)
 #define PLT_ALIGN		 RTE_ALIGN
 #define PLT_ALIGN_MUL_CEIL	 RTE_ALIGN_MUL_CEIL
diff --git a/drivers/event/cnxk/cn10k_eventdev.c b/drivers/event/cnxk/cn10k_eventdev.c
index 8af273a01b..cf0a7d2325 100644
--- a/drivers/event/cnxk/cn10k_eventdev.c
+++ b/drivers/event/cnxk/cn10k_eventdev.c
@@ -976,4 +976,5 @@ RTE_PMD_REGISTER_PARAM_STRING(event_cn10k, CNXK_SSO_XAE_CNT "=<int>"
 			      CNXK_TIM_DISABLE_NPA "=1"
 			      CNXK_TIM_CHNK_SLOTS "=<int>"
 			      CNXK_TIM_RINGS_LMT "=<int>"
-			      CNXK_TIM_STATS_ENA "=1");
+			      CNXK_TIM_STATS_ENA "=1"
+			      CNXK_TIM_EXT_CLK "=<string>");
diff --git a/drivers/event/cnxk/cnxk_tim_evdev.c b/drivers/event/cnxk/cnxk_tim_evdev.c
index 369f198444..21071c2d27 100644
--- a/drivers/event/cnxk/cnxk_tim_evdev.c
+++ b/drivers/event/cnxk/cnxk_tim_evdev.c
@@ -117,6 +117,80 @@ cnxk_tim_ring_info_get(const struct rte_event_timer_adapter *adptr,
 		   sizeof(struct rte_event_timer_adapter_conf));
 }
 
+static inline void
+sort_multi_array(double ref_arr[], uint64_t arr1[], uint64_t arr2[],
+		 uint64_t arr3[], uint8_t sz)
+{
+	int x;
+
+	for (x = 0; x < sz - 1; x++) {
+		if (ref_arr[x] > ref_arr[x + 1]) {
+			PLT_SWAP(ref_arr[x], ref_arr[x + 1]);
+			PLT_SWAP(arr1[x], arr1[x + 1]);
+			PLT_SWAP(arr2[x], arr2[x + 1]);
+			PLT_SWAP(arr3[x], arr3[x + 1]);
+			x = -1;
+		}
+	}
+}
+
+static inline void
+populate_sample(uint64_t tck[], uint64_t ns[], double diff[], uint64_t dst[],
+		uint64_t req_tck, uint64_t clk_freq, double tck_ns, uint8_t sz,
+		bool mov_fwd)
+{
+	int i;
+
+	for (i = 0; i < sz; i++) {
+		tck[i] = i ? tck[i - 1] : req_tck;
+		do {
+			mov_fwd ? tck[i]++ : tck[i]--;
+			ns[i] = round((double)tck[i] * tck_ns);
+			if (round((double)tck[i] * tck_ns) >
+			    ((double)tck[i] * tck_ns))
+				continue;
+		} while (ns[i] % (uint64_t)cnxk_tim_ns_per_tck(clk_freq));
+		diff[i] = PLT_MAX((double)ns[i], (double)tck[i] * tck_ns) -
+			  PLT_MIN((double)ns[i], (double)tck[i] * tck_ns);
+		dst[i] = mov_fwd ? tck[i] - req_tck : req_tck - tck[i];
+	}
+}
+
+static void
+tim_adjust_resolution(uint64_t *req_ns, uint64_t *req_tck, double tck_ns,
+		      uint64_t clk_freq, uint64_t max_tmo, uint64_t m_tck)
+{
+#define MAX_SAMPLES 5
+	double rmax_diff[MAX_SAMPLES], rmin_diff[MAX_SAMPLES];
+	uint64_t min_tck[MAX_SAMPLES], max_tck[MAX_SAMPLES];
+	uint64_t min_dst[MAX_SAMPLES], max_dst[MAX_SAMPLES];
+	uint64_t min_ns[MAX_SAMPLES], max_ns[MAX_SAMPLES];
+	int i;
+
+	populate_sample(max_tck, max_ns, rmax_diff, max_dst, *req_tck, clk_freq,
+			tck_ns, MAX_SAMPLES, true);
+	sort_multi_array(rmax_diff, max_dst, max_tck, max_ns, MAX_SAMPLES);
+
+	populate_sample(min_tck, min_ns, rmin_diff, min_dst, *req_tck, clk_freq,
+			tck_ns, MAX_SAMPLES, false);
+	sort_multi_array(rmin_diff, min_dst, min_tck, min_ns, MAX_SAMPLES);
+
+	for (i = 0; i < MAX_SAMPLES; i++) {
+		if (min_dst[i] < max_dst[i] && min_tck[i] > m_tck &&
+		    (max_tmo / min_ns[i]) <=
+			    (TIM_MAX_BUCKET_SIZE - TIM_MIN_BUCKET_SIZE)) {
+			*req_tck = min_tck[i];
+			*req_ns = min_ns[i];
+			break;
+		} else if ((max_tmo / max_ns[i]) <
+			   (TIM_MAX_BUCKET_SIZE - TIM_MIN_BUCKET_SIZE)) {
+			*req_tck = max_tck[i];
+			*req_ns = max_ns[i];
+			break;
+		}
+	}
+}
+
 static int
 cnxk_tim_ring_create(struct rte_event_timer_adapter *adptr)
 {
@@ -178,10 +252,25 @@ cnxk_tim_ring_create(struct rte_event_timer_adapter *adptr)
 		goto tim_hw_free;
 	}
 
-	/* Round */
 	tim_ring->tck_nsec =
 		round(RTE_ALIGN_MUL_NEAR((long double)rcfg->timer_tick_ns,
 					 cnxk_tim_ns_per_tck(clk_freq)));
+	if (log10(clk_freq) - floor(log10(clk_freq)) != 0.0) {
+		uint64_t req_ns, req_tck;
+		double tck_ns;
+
+		req_ns = tim_ring->tck_nsec;
+		tck_ns = NSECPERSEC / clk_freq;
+		req_tck = round(rcfg->timer_tick_ns / tck_ns);
+		tim_adjust_resolution(&req_ns, &req_tck, tck_ns, clk_freq,
+				      rcfg->max_tmo_ns, min_intvl_cyc);
+		if ((tim_ring->tck_nsec != req_ns) &&
+		    !(rcfg->flags & RTE_EVENT_TIMER_ADAPTER_F_ADJUST_RES)) {
+			rc = -ERANGE;
+			goto tim_hw_free;
+		}
+		tim_ring->tck_nsec = ceil(req_tck * tck_ns);
+	}
 
 	tim_ring->tck_int = round((long double)tim_ring->tck_nsec /
 				  cnxk_tim_ns_per_tck(clk_freq));
@@ -489,6 +578,43 @@ cnxk_tim_parse_kvargs_dict(const char *key, const char *value, void *opaque)
 	return 0;
 }
 
+static void
+cnxk_tim_parse_clk_list(const char *value, void *opaque)
+{
+	enum roc_tim_clk_src src[] = {ROC_TIM_CLK_SRC_GPIO, ROC_TIM_CLK_SRC_PTP,
+				      ROC_TIM_CLK_SRC_SYNCE,
+				      ROC_TIM_CLK_SRC_INVALID};
+	struct cnxk_tim_evdev *dev = opaque;
+	char *str = strdup(value);
+	char *tok;
+	int i = 0;
+
+	if (!strlen(str))
+		return;
+
+	tok = strtok(str, "-");
+	while (tok != NULL && src[i] != ROC_TIM_CLK_SRC_INVALID) {
+		dev->ext_clk_freq[src[i]] = strtoull(tok, NULL, 10);
+		tok = strtok(NULL, "-");
+		i++;
+	}
+
+	free(str);
+}
+
+static int
+cnxk_tim_parse_kvargs_dsv(const char *key, const char *value, void *opaque)
+{
+	RTE_SET_USED(key);
+
+	/* DSV format GPIO-PTP-SYNCE-BTS use '-' as ','
+	 * isn't allowed. 0 represents default.
+	 */
+	cnxk_tim_parse_clk_list(value, opaque);
+
+	return 0;
+}
+
 static void
 cnxk_tim_parse_devargs(struct rte_devargs *devargs, struct cnxk_tim_evdev *dev)
 {
@@ -511,6 +637,8 @@ cnxk_tim_parse_devargs(struct rte_devargs *devargs, struct cnxk_tim_evdev *dev)
 			   &dev->min_ring_cnt);
 	rte_kvargs_process(kvlist, CNXK_TIM_RING_CTL,
 			   &cnxk_tim_parse_kvargs_dict, &dev);
+	rte_kvargs_process(kvlist, CNXK_TIM_EXT_CLK, &cnxk_tim_parse_kvargs_dsv,
+			   dev);
 
 	rte_kvargs_free(kvlist);
 }
diff --git a/drivers/event/cnxk/cnxk_tim_evdev.h b/drivers/event/cnxk/cnxk_tim_evdev.h
index 7d401fccbd..4ce22ed7a4 100644
--- a/drivers/event/cnxk/cnxk_tim_evdev.h
+++ b/drivers/event/cnxk/cnxk_tim_evdev.h
@@ -39,6 +39,7 @@
 #define CNXK_TIM_STATS_ENA   "tim_stats_ena"
 #define CNXK_TIM_RINGS_LMT   "tim_rings_lmt"
 #define CNXK_TIM_RING_CTL    "tim_ring_ctl"
+#define CNXK_TIM_EXT_CLK     "tim_eclk_freq"
 
 #define CNXK_TIM_SP	   0x1
 #define CNXK_TIM_MP	   0x2
@@ -94,6 +95,7 @@ struct cnxk_tim_evdev {
 	uint16_t min_ring_cnt;
 	uint8_t enable_stats;
 	uint16_t ring_ctl_cnt;
+	uint64_t ext_clk_freq[ROC_TIM_CLK_SRC_INVALID];
 	struct cnxk_tim_ctl *ring_ctl_data;
 };
 
@@ -237,6 +239,8 @@ cnxk_tim_get_clk_freq(struct cnxk_tim_evdev *dev, enum roc_tim_clk_src clk_src,
 	case ROC_TIM_CLK_SRC_GPIO:
 	case ROC_TIM_CLK_SRC_PTP:
 	case ROC_TIM_CLK_SRC_SYNCE:
+		*freq = dev->ext_clk_freq[clk_src];
+		break;
 	default:
 		return -EINVAL;
 	}
