diff --git a/include/osi_common.h b/include/osi_common.h
index d1f5ede..f050c52 100644
--- a/include/osi_common.h
+++ b/include/osi_common.h
@@ -37,6 +37,7 @@
 
 /* System clock is 62.5MHz */
 #define OSI_ETHER_SYSCLOCK		62500000U
+#define OSI_PTP_REQ_CLK_FREQ		250000000U
 #define OSI_ONE_MEGA_HZ			1000000U
 #define OSI_MAX_RX_COALESCE_USEC	1020U
 #define OSI_MIN_RX_COALESCE_USEC	3U
diff --git a/osi/core/eqos_core.c b/osi/core/eqos_core.c
index 7e21c28..c8626bc 100644
--- a/osi/core/eqos_core.c
+++ b/osi/core/eqos_core.c
@@ -3151,7 +3151,7 @@ static void eqos_config_tscr(void *addr, unsigned int ptp_filter)
  *
  * @param[in] addr: Base address indicating the start of
  * 	      memory mapped IO region of the MAC.
- * @param[in] ptp_clock: PTP clock
+ * @param[in] ptp_clock: PTP required clock frequency
  *
  * @note MAC should be init and started. see osi_start_mac()
  */
@@ -3162,14 +3162,14 @@ static void eqos_config_ssir(void *addr, unsigned int ptp_clock)
 
 	mac_tcr = osi_readl((unsigned char *)addr + EQOS_MAC_TCR);
 
-	/* convert the PTP_CLOCK to nano second.
+	/* convert the PTP required clock frequency to nano second.
 	 * formula is : ((1/ptp_clock) * 1000000000)
-	 * where, ptp_clock = 50MHz if FINE correction
-	 * and ptp_clock = EQOS_SYSCLOCK if COARSE correction
+	 * where, ptp_clock = OSI_PTP_REQ_CLK_FREQ if FINE correction
+	 * and ptp_clock = PTP reference clock if COARSE correction
 	 */
 
 	if ((mac_tcr & EQOS_MAC_TCR_TSCFUPDT) == EQOS_MAC_TCR_TSCFUPDT) {
-		val = ((1U * OSI_NSEC_PER_SEC) / OSI_ETHER_SYSCLOCK);
+		val = ((1U * OSI_NSEC_PER_SEC) / OSI_PTP_REQ_CLK_FREQ);
 	} else {
 		val = ((1U * OSI_NSEC_PER_SEC) / ptp_clock);
 	}
diff --git a/osi/core/osi_core.c b/osi/core/osi_core.c
index 57eed58..dc40d89 100644
--- a/osi/core/osi_core.c
+++ b/osi/core/osi_core.c
@@ -869,13 +869,13 @@ int osi_ptp_configuration(struct osi_core_priv_data *osi_core,
 
 		/* formula for calculating addend value is
 		 * addend = 2^32/freq_div_ratio;
-		 * where, freq_div_ratio = EQOS_SYSCLOCK/50MHz
-		 * hence, addend = ((2^32) * 50MHz)/EQOS_SYSCLOCK;
-		 * NOTE: EQOS_SYSCLOCK must be >= 50MHz to achive 20ns accuracy.
+		 * where, freq_div_ratio = ptp_ref_clk_rate/OSI_PTP_REQ_CLK_FREQ
 		 * 2^x * y == (y << x), hence
-		 * 2^32 * 6250000 ==> (6250000 << 32)
+		 * 2^32 * OSI_PTP_REQ_CLK_FREQ == (OSI_PTP_REQ_CLK_FREQ << 32)
+		 * so addend = (2^32 * OSI_PTP_REQ_CLK_FREQ)/ptp_ref_clk_rate;
+		 * which is (OSI_PTP_REQ_CLK_FREQ << 32)/ptp_ref_clk_rate;
 		 */
-		temp = ((unsigned long)OSI_ETHER_SYSCLOCK << 32);
+		temp = ((unsigned long)OSI_PTP_REQ_CLK_FREQ << 32);
 		temp1 = div_u64(temp,
 				(unsigned long)osi_core->ptp_config.ptp_ref_clk_rate);
 		if (temp1 < UINT_MAX) {