linux-kernel - [PATCH net-next v6 4/7] net: stmmac: introduce pcs_init/pcs

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Message-Id: <20240510-rzn1-gmac1-v6-4-b63942be334c@bootlin.com>
Date: Fri, 10 May 2024 09:38:11 +0200
From: Romain Gantois <romain.gantois@...tlin.com>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Geert Uytterhoeven <geert+renesas@...der.be>, 
 Magnus Damm <magnus.damm@...il.com>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Jose Abreu <joabreu@...opsys.com>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Russell King <linux@...linux.org.uk>, 
 Clément Léger <clement.leger@...tlin.com>, 
 Serge Semin <fancer.lancer@...il.com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-renesas-soc@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, 
 linux-arm-kernel@...ts.infradead.org, 
 "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>, 
 Maxime Chevallier <maxime.chevallier@...tlin.com>, 
 Romain Gantois <romain.gantois@...tlin.com>
Subject: [PATCH net-next v6 4/7] net: stmmac: introduce pcs_init/pcs_exit
 stmmac operations

From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>

Introduce a mechanism whereby platforms can create their PCS instances
prior to the network device being published to userspace, but after
some of the core stmmac initialisation has been completed. This means
that the data structures that platforms need will be available.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Reviewed-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
Reviewed-by: Serge Semin <fancer.lancer@...il.com>
Co-developed-by: Romain Gantois <romain.gantois@...tlin.com>
Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 8 +++++++-
 include/linux/stmmac.h                            | 2 ++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index 778d79cdb2e6d..f562c563aab55 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -505,7 +505,10 @@ int stmmac_pcs_setup(struct net_device *ndev)
 	priv = netdev_priv(ndev);
 	mode = priv->plat->phy_interface;

-	if (priv->plat->mdio_bus_data && priv->plat->mdio_bus_data->has_xpcs) {
+	if (priv->plat->pcs_init) {
+		ret = priv->plat->pcs_init(priv);
+	} else if (priv->plat->mdio_bus_data &&
+		   priv->plat->mdio_bus_data->has_xpcs) {
 		/* Try to probe the XPCS by scanning all addresses */
 		for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
 			xpcs = xpcs_create_mdiodev(priv->mii, addr, mode);
@@ -533,6 +536,9 @@ void stmmac_pcs_clean(struct net_device *ndev)
 {
 	struct stmmac_priv *priv = netdev_priv(ndev);

+	if (priv->plat->pcs_exit)
+		priv->plat->pcs_exit(priv);
+
 	if (!priv->hw->xpcs)
 		return;

diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index dfa1828cd756a..4a24a246c617d 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -285,6 +285,8 @@ struct plat_stmmacenet_data {
 	int (*crosststamp)(ktime_t *device, struct system_counterval_t *system,
 			   void *ctx);
 	void (*dump_debug_regs)(void *priv);
+	int (*pcs_init)(struct stmmac_priv *priv);
+	void (*pcs_exit)(struct stmmac_priv *priv);
 	void *bsp_priv;
 	struct clk *stmmac_clk;
 	struct clk *pclk;

-- 
2.44.0