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Date:   Thu,  4 Aug 2022 15:47:00 -0400
From:   Sean Anderson <sean.anderson@...o.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Madalin Bucur <madalin.bucur@....com>,
        Camelia Alexandra Groza <camelia.groza@....com>,
        netdev@...r.kernel.org
Cc:     "linuxppc-dev @ lists . ozlabs . org" <linuxppc-dev@...ts.ozlabs.org>,
        linux-kernel@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        linux-arm-kernel@...ts.infradead.org,
        Eric Dumazet <edumazet@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        Sean Anderson <sean.anderson@...o.com>
Subject: [PATCH net-next v4 3/8] net: fman: memac: Add serdes support

This adds support for using a serdes which has to be configured. This is
primarly in preparation for the next commit, which will then change the
serdes mode dynamically.

Signed-off-by: Sean Anderson <sean.anderson@...o.com>
---

Changes in v4:
- Don't fail if phy support was not compiled in

 .../net/ethernet/freescale/fman/fman_memac.c  | 49 ++++++++++++++++++-
 1 file changed, 47 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fman/fman_memac.c b/drivers/net/ethernet/freescale/fman/fman_memac.c
index 02b3a0a2d5d1..2886f86e45ba 100644
--- a/drivers/net/ethernet/freescale/fman/fman_memac.c
+++ b/drivers/net/ethernet/freescale/fman/fman_memac.c
@@ -13,6 +13,7 @@
 #include <linux/io.h>
 #include <linux/phy.h>
 #include <linux/phy_fixed.h>
+#include <linux/phy/phy.h>
 #include <linux/of_mdio.h>
 
 /* PCS registers */
@@ -324,6 +325,7 @@ struct fman_mac {
 	void *fm;
 	struct fman_rev_info fm_rev_info;
 	bool basex_if;
+	struct phy *serdes;
 	struct phy_device *pcsphy;
 	bool allmulti_enabled;
 };
@@ -1203,17 +1205,56 @@ int memac_initialization(struct mac_device *mac_dev,
 		}
 	}
 
+	memac->serdes = devm_of_phy_get(mac_dev->dev, mac_node, "serdes");
+	err = PTR_ERR(memac->serdes);
+	if (err == -ENODEV || err == -ENOSYS) {
+		dev_dbg(mac_dev->dev, "could not get (optional) serdes\n");
+		memac->serdes = NULL;
+	} else if (IS_ERR(memac->serdes)) {
+		dev_err_probe(mac_dev->dev, err, "could not get serdes\n");
+		goto _return_fm_mac_free;
+	} else {
+		err = phy_init(memac->serdes);
+		if (err) {
+			dev_err_probe(mac_dev->dev, err,
+				      "could not initialize serdes\n");
+			goto _return_fm_mac_free;
+		}
+
+		err = phy_power_on(memac->serdes);
+		if (err) {
+			dev_err_probe(mac_dev->dev, err,
+				      "could not power on serdes\n");
+			goto _return_phy_exit;
+		}
+
+		if (memac->phy_if == PHY_INTERFACE_MODE_SGMII ||
+		    memac->phy_if == PHY_INTERFACE_MODE_1000BASEX ||
+		    memac->phy_if == PHY_INTERFACE_MODE_2500BASEX ||
+		    memac->phy_if == PHY_INTERFACE_MODE_QSGMII ||
+		    memac->phy_if == PHY_INTERFACE_MODE_XGMII) {
+			err = phy_set_mode_ext(memac->serdes, PHY_MODE_ETHERNET,
+					       memac->phy_if);
+			if (err) {
+				dev_err_probe(mac_dev->dev, err,
+					      "could not set serdes mode to %s\n",
+					      phy_modes(memac->phy_if));
+				goto _return_phy_power_off;
+			}
+		}
+	}
+
 	if (!mac_dev->phy_node && of_phy_is_fixed_link(mac_node)) {
 		struct phy_device *phy;
 
 		err = of_phy_register_fixed_link(mac_node);
 		if (err)
-			goto _return_fm_mac_free;
+			goto _return_phy_power_off;
 
 		fixed_link = kzalloc(sizeof(*fixed_link), GFP_KERNEL);
 		if (!fixed_link) {
 			err = -ENOMEM;
-			goto _return_fm_mac_free;
+			goto _return_phy_power_off;
 		}
 
 		mac_dev->phy_node = of_node_get(mac_node);
@@ -1242,6 +1283,10 @@ int memac_initialization(struct mac_device *mac_dev,
 
 	goto _return;
 
+_return_phy_power_off:
+	phy_power_off(memac->serdes);
+_return_phy_exit:
+	phy_exit(memac->serdes);
 _return_fixed_link_free:
 	kfree(fixed_link);
 _return_fm_mac_free:
-- 
2.35.1.1320.gc452695387.dirty

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