net: phy: nxp-c45-tja11xx: enable LTC sampling on both ext_ts edges

The external trigger configuration for TJA1120 has changed. The PHY
supports sampling of the LTC on rising and on falling edge.

Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@oss.nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20230731091619.77961-7-radu-nicolae.pirea@oss.nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/nxp-c45-tja11xx.c

@@ -101,6 +101,10 @@
 #define VEND1_PTP_CONFIG		0x1102
 #define EXT_TRG_EDGE			BIT(1)
 
+#define TJA1120_SYNC_TRIG_FILTER	0x1010
+#define PTP_TRIG_RISE_TS		BIT(3)
+#define PTP_TRIG_FALLING_TS		BIT(2)
+
 #define CLK_RATE_ADJ_LD			BIT(15)
 #define CLK_RATE_ADJ_DIR		BIT(14)
 
@@ -238,6 +242,7 @@ struct nxp_c45_phy_data {
 	const struct nxp_c45_phy_stats *stats;
 	int n_stats;
 	u8 ptp_clk_period;
+	bool ext_ts_both_edges;
 	void (*counters_enable)(struct phy_device *phydev);
 	void (*ptp_init)(struct phy_device *phydev);
 	void (*ptp_enable)(struct phy_device *phydev, bool enable);
@@ -684,9 +689,48 @@ static int nxp_c45_perout_enable(struct nxp_c45_phy *priv,
 	return 0;
 }
 
+static void nxp_c45_set_rising_or_falling(struct phy_device *phydev,
+					  struct ptp_extts_request *extts)
+{
+	if (extts->flags & PTP_RISING_EDGE)
+		phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1,
+				   VEND1_PTP_CONFIG, EXT_TRG_EDGE);
+
+	if (extts->flags & PTP_FALLING_EDGE)
+		phy_set_bits_mmd(phydev, MDIO_MMD_VEND1,
+				 VEND1_PTP_CONFIG, EXT_TRG_EDGE);
+}
+
+static void nxp_c45_set_rising_and_falling(struct phy_device *phydev,
+					   struct ptp_extts_request *extts)
+{
+	/* PTP_EXTTS_REQUEST may have only the PTP_ENABLE_FEATURE flag set. In
+	 * this case external ts will be enabled on rising edge.
+	 */
+	if (extts->flags & PTP_RISING_EDGE ||
+	    extts->flags == PTP_ENABLE_FEATURE)
+		phy_set_bits_mmd(phydev, MDIO_MMD_VEND1,
+				 TJA1120_SYNC_TRIG_FILTER,
+				 PTP_TRIG_RISE_TS);
+	else
+		phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1,
+				   TJA1120_SYNC_TRIG_FILTER,
+				   PTP_TRIG_RISE_TS);
+
+	if (extts->flags & PTP_FALLING_EDGE)
+		phy_set_bits_mmd(phydev, MDIO_MMD_VEND1,
+				 TJA1120_SYNC_TRIG_FILTER,
+				 PTP_TRIG_FALLING_TS);
+	else
+		phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1,
+				   TJA1120_SYNC_TRIG_FILTER,
+				   PTP_TRIG_FALLING_TS);
+}
+
 static int nxp_c45_extts_enable(struct nxp_c45_phy *priv,
 				struct ptp_extts_request *extts, int on)
 {
+	const struct nxp_c45_phy_data *data = nxp_c45_get_data(priv->phydev);
 	int pin;
 
 	if (extts->flags & ~(PTP_ENABLE_FEATURE |
@@ -697,7 +741,8 @@ static int nxp_c45_extts_enable(struct nxp_c45_phy *priv,
 
 	/* Sampling on both edges is not supported */
 	if ((extts->flags & PTP_RISING_EDGE) &&
-	    (extts->flags & PTP_FALLING_EDGE))
+	    (extts->flags & PTP_FALLING_EDGE) &&
+	    !data->ext_ts_both_edges)
 		return -EOPNOTSUPP;
 
 	pin = ptp_find_pin(priv->ptp_clock, PTP_PF_EXTTS, extts->index);
@@ -711,13 +756,10 @@ static int nxp_c45_extts_enable(struct nxp_c45_phy *priv,
 		return 0;
 	}
 
-	if (extts->flags & PTP_RISING_EDGE)
-		phy_clear_bits_mmd(priv->phydev, MDIO_MMD_VEND1,
-				   VEND1_PTP_CONFIG, EXT_TRG_EDGE);
-
-	if (extts->flags & PTP_FALLING_EDGE)
-		phy_set_bits_mmd(priv->phydev, MDIO_MMD_VEND1,
-				 VEND1_PTP_CONFIG, EXT_TRG_EDGE);
+	if (data->ext_ts_both_edges)
+		nxp_c45_set_rising_and_falling(priv->phydev, extts);
+	else
+		nxp_c45_set_rising_or_falling(priv->phydev, extts);
 
 	nxp_c45_gpio_config(priv, pin, GPIO_EXTTS_OUT_CFG);
 	priv->extts = true;
@@ -1545,6 +1587,7 @@ static const struct nxp_c45_phy_data tja1103_phy_data = {
 	.stats = tja1103_hw_stats,
 	.n_stats = ARRAY_SIZE(tja1103_hw_stats),
 	.ptp_clk_period = PTP_CLK_PERIOD_100BT1,
+	.ext_ts_both_edges = false,
 	.counters_enable = tja1103_counters_enable,
 	.ptp_init = tja1103_ptp_init,
 	.ptp_enable = tja1103_ptp_enable,
@@ -1640,6 +1683,7 @@ static const struct nxp_c45_phy_data tja1120_phy_data = {
 	.stats = tja1120_hw_stats,
 	.n_stats = ARRAY_SIZE(tja1120_hw_stats),
 	.ptp_clk_period = PTP_CLK_PERIOD_1000BT1,
+	.ext_ts_both_edges = true,
 	.counters_enable = tja1120_counters_enable,
 	.ptp_init = tja1120_ptp_init,
 	.ptp_enable = tja1120_ptp_enable,