R-Car AVB-DMAC supports timestamp feature.
Add a timestamp hw feature bit to struct ravb_hw_info
to add this feature only for R-Car.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
 drivers/net/ethernet/renesas/ravb.h      |  2 +
 drivers/net/ethernet/renesas/ravb_main.c | 68 +++++++++++++++---------
 2 files changed, 45 insertions(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index ab4909244276..2505de5d4a28 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h

@@ -1034,6 +1034,7 @@ struct ravb_hw_info {
 	unsigned mii_rgmii_selection:1;	/* E-MAC supports mii/rgmii selection */
 	unsigned half_duplex:1;		/* E-MAC supports half duplex mode */
 	unsigned rx_2k_buffers:1;	/* AVB-DMAC has Max 2K buf size on RX */
+	unsigned timestamp:1;		/* AVB-DMAC has timestamp */

@@ -1089,6 +1090,7 @@ struct ravb_private {
 	unsigned int num_tx_desc;	/* TX descriptors per packet */
 
 	int duplex;
+	struct ravb_rx_desc *rgeth_rx_ring[NUM_RX_QUEUE];

 
 	const struct ravb_hw_info *info;
 	struct reset_control *rstc;

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 9c0d35f4b221..2c375002ebcb 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c

@@ -949,11 +949,14 @@ static bool ravb_queue_interrupt(struct net_device *ndev, int q)
 
 static bool ravb_timestamp_interrupt(struct net_device *ndev)
 {
+	struct ravb_private *priv = netdev_priv(ndev);
+	const struct ravb_hw_info *info = priv->info;
 	u32 tis = ravb_read(ndev, TIS);
 
 	if (tis & TIS_TFUF) {
 		ravb_write(ndev, ~(TIS_TFUF | TIS_RESERVED), TIS);
-		ravb_get_tx_tstamp(ndev);
+		if (info->timestamp)
+			ravb_get_tx_tstamp(ndev);