drivers: eth_e1000: adjust ptp clock rate based on nominal frequency

Adjusted ptp clock rate based on nominal frequency.

Signed-off-by: Yangbo Lu <[email protected]>

Author: yangbolu1991

drivers/ethernet/eth_e1000.c

@@ -397,22 +397,12 @@ static int ptp_clock_e1000_rate_adjust(const struct device *dev, double ratio)
 	int32_t mul;
 	float val;
 
-	/* No change needed. */
-	if (ratio == 1.0) {
-		return 0;
-	}
-
-	ratio *= context->clk_ratio;
-
 	/* Limit possible ratio. */
 	if ((ratio > 1.0 + 1.0/(2.0 * hw_inc)) ||
 			(ratio < 1.0 - 1.0/(2.0 * hw_inc))) {
 		return -EINVAL;
 	}
 
-	/* Save new ratio. */
-	context->clk_ratio = ratio;
-
 	if (ratio < 1.0) {
 		corr = hw_inc - 1;
 		val = 1.0 / (hw_inc * (1.0 - ratio));

drivers/ethernet/eth_e1000_priv.h

@@ -102,7 +102,6 @@ struct e1000_dev {
 	uint8_t rxb[CONFIG_ETH_E1000_RX_QUEUE_SIZE][NET_ETH_MTU];
 #if defined(CONFIG_ETH_E1000_PTP_CLOCK)
 	const struct device *ptp_clock;
-	double clk_ratio;
 #endif
 #if defined(CONFIG_NET_STATISTICS_ETHERNET)
 	struct net_stats_eth stats;