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From: Serge Semin <fancer.lancer@gmail.com>
To: Andrew Lunn <andrew@lunn.ch>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Russell King <linux@armlinux.org.uk>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>,
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	Jose Abreu <Jose.Abreu@synopsys.com>,
	Vladimir Oltean <olteanv@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Maxime Chevallier <maxime.chevallier@bootlin.com>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Paolo Abeni <pabeni@redhat.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Serge Semin <fancer.lancer@gmail.com>,
	Sagar Cheluvegowda <quic_scheluve@quicinc.com>,
	Abhishek Chauhan <quic_abchauha@quicinc.com>,
	Andrew Halaney <ahalaney@redhat.com>,
	Jiawen Wu <jiawenwu@trustnetic.com>,
	Mengyuan Lou <mengyuanlou@net-swift.com>,
	Tomer Maimon <tmaimon77@gmail.com>,
	openbmc@lists.ozlabs.org,
	netdev@vger.kernel.org,
	devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH net-next v2 10/10] net: stmmac: Add DW XPCS specified via "pcs-handle" support
Date: Sun,  2 Jun 2024 17:36:24 +0300
Message-ID: <20240602143636.5839-11-fancer.lancer@gmail.com>
In-Reply-To: <20240602143636.5839-1-fancer.lancer@gmail.com>
References: <20240602143636.5839-1-fancer.lancer@gmail.com>
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Recently the DW XPCS DT-bindings have been introduced and the DW XPCS
driver has been altered to support the DW XPCS registered as a platform
device. In order to have the DW XPCS DT-device accessed from the STMMAC
driver let's alter the STMMAC PCS-setup procedure to support the
"pcs-handle" property containing the phandle reference to the DW XPCS
device DT-node. The respective fwnode will be then passed to the
xpcs_create_fwnode() function which in its turn will create the DW XPCS
descriptor utilized in the main driver for the PCS-related setups.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index 807789d7309a..dc040051aa53 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -497,15 +497,22 @@ int stmmac_mdio_reset(struct mii_bus *bus)
 
 int stmmac_pcs_setup(struct net_device *ndev)
 {
+	struct fwnode_handle *devnode, *pcsnode;
 	struct dw_xpcs *xpcs = NULL;
 	struct stmmac_priv *priv;
 	int addr, mode, ret;
 
 	priv = netdev_priv(ndev);
 	mode = priv->plat->phy_interface;
+	devnode = priv->plat->port_node;
 
 	if (priv->plat->pcs_init) {
 		ret = priv->plat->pcs_init(priv);
+	} else if (fwnode_property_present(devnode, "pcs-handle")) {
+		pcsnode = fwnode_find_reference(devnode, "pcs-handle", 0);
+		xpcs = xpcs_create_fwnode(pcsnode, mode);
+		fwnode_handle_put(pcsnode);
+		ret = PTR_ERR_OR_ZERO(xpcs);
 	} else if (priv->plat->mdio_bus_data &&
 		   priv->plat->mdio_bus_data->has_xpcs) {
 		addr = priv->plat->mdio_bus_data->xpcs_addr;
@@ -515,10 +522,8 @@ int stmmac_pcs_setup(struct net_device *ndev)
 		return 0;
 	}
 
-	if (ret) {
-		dev_warn(priv->device, "No xPCS found\n");
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(priv->device, ret, "No xPCS found\n");
 
 	priv->hw->xpcs = xpcs;
 
-- 
2.43.0