netdev - [PATCH net-next v2 3/3] net: dpaa2-mac: add backplane link mode support

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Message-Id: <E1l7yX3-0006ob-E6@rmk-PC.armlinux.org.uk>
Date:   Fri, 05 Feb 2021 10:40:09 +0000
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Ioana Ciornei <ioana.ciornei@....com>,
        Ioana Radulescu <ruxandra.radulescu@....com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH net-next v2 3/3] net: dpaa2-mac: add backplane link mode
 support

Add support for backplane link mode, which is, according to discussions
with NXP earlier in the year, is a mode where the OS (Linux) is able to
manage the PCS and Serdes itself.

This commit prepares the ground work for allowing 1G fiber connections
to be used with DPAA2 on the SolidRun CEX7 platforms.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h | 4 +++-
 drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c | 5 +++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
index c3d456c45102..9b6a89709ce1 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
@@ -695,7 +695,9 @@ static inline unsigned int dpaa2_eth_rx_head_room(struct dpaa2_eth_priv *priv)
 
 static inline bool dpaa2_eth_is_type_phy(struct dpaa2_eth_priv *priv)
 {
-	if (priv->mac && priv->mac->attr.link_type == DPMAC_LINK_TYPE_PHY)
+	if (priv->mac &&
+	    (priv->mac->attr.link_type == DPMAC_LINK_TYPE_PHY ||
+	     priv->mac->attr.link_type == DPMAC_LINK_TYPE_BACKPLANE))
 		return true;
 
 	return false;
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
index 3ddfb40eb5e4..ccaf7e35abeb 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
@@ -315,8 +315,9 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
 		goto err_put_node;
 	}
 
-	if (mac->attr.link_type == DPMAC_LINK_TYPE_PHY &&
-	    mac->attr.eth_if != DPMAC_ETH_IF_RGMII) {
+	if ((mac->attr.link_type == DPMAC_LINK_TYPE_PHY &&
+	     mac->attr.eth_if != DPMAC_ETH_IF_RGMII) ||
+	    mac->attr.link_type == DPMAC_LINK_TYPE_BACKPLANE) {
 		err = dpaa2_pcs_create(mac, dpmac_node, mac->attr.id);
 		if (err)
 			goto err_put_node;
-- 
2.20.1