linux-kernel - [PATCH net-next v4 5/5] net: dwmac_socfpga: initialize local data for mdio regmap configuration

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Message-Id: <20230607135941.407054-6-maxime.chevallier@bootlin.com>
Date:   Wed,  7 Jun 2023 15:59:41 +0200
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     davem@...emloft.net
Cc:     Maxime Chevallier <maxime.chevallier@...tlin.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        alexis.lothore@...tlin.com, thomas.petazzoni@...tlin.com,
        Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Simon Horman <simon.horman@...igine.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Feiyang Chen <chenfeiyang@...ngson.cn>,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: [PATCH net-next v4 5/5] net: dwmac_socfpga: initialize local data for mdio regmap configuration

Explicitely zero-ize the local mdio_regmap_config data, and explicitely
set the .autoscan parameter, as we only have a PCS on this bus.

Fixes: 5d1f3fe7d2d5 ("net: stmmac: dwmac-sogfpga: use the lynx pcs driver")
Suggested-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
---
V3->V4 : Move pcs_regmap_cfg into a more local block, and zeroize mrc
V2->V3 : New patch

 .../net/ethernet/stmicro/stmmac/dwmac-socfpga.c   | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
index 1fb808be843b..6267bcb60206 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
@@ -389,7 +389,6 @@ static int socfpga_dwmac_probe(struct platform_device *pdev)
 	struct net_device	*ndev;
 	struct stmmac_priv	*stpriv;
 	const struct socfpga_dwmac_ops *ops;
-	struct regmap_config pcs_regmap_cfg;
 
 	ops = device_get_match_data(&pdev->dev);
 	if (!ops) {
@@ -447,19 +446,22 @@ static int socfpga_dwmac_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_dvr_remove;
 
-	memset(&pcs_regmap_cfg, 0, sizeof(pcs_regmap_cfg));
-	pcs_regmap_cfg.reg_bits = 16;
-	pcs_regmap_cfg.val_bits = 16;
-	pcs_regmap_cfg.reg_shift = REGMAP_UPSHIFT(1);
-
 	/* Create a regmap for the PCS so that it can be used by the PCS driver,
 	 * if we have such a PCS
 	 */
 	if (dwmac->tse_pcs_base) {
+		struct regmap_config pcs_regmap_cfg;
 		struct mdio_regmap_config mrc;
 		struct regmap *pcs_regmap;
 		struct mii_bus *pcs_bus;
 
+		memset(&pcs_regmap_cfg, 0, sizeof(pcs_regmap_cfg));
+		memset(&mrc, 0, sizeof(mrc));
+
+		pcs_regmap_cfg.reg_bits = 16;
+		pcs_regmap_cfg.val_bits = 16;
+		pcs_regmap_cfg.reg_shift = REGMAP_UPSHIFT(1);
+
 		pcs_regmap = devm_regmap_init_mmio(&pdev->dev, dwmac->tse_pcs_base,
 						   &pcs_regmap_cfg);
 		if (IS_ERR(pcs_regmap)) {
@@ -470,6 +472,7 @@ static int socfpga_dwmac_probe(struct platform_device *pdev)
 		mrc.regmap = pcs_regmap;
 		mrc.parent = &pdev->dev;
 		mrc.valid_addr = 0x0;
+		mrc.autoscan = false;
 
 		snprintf(mrc.name, MII_BUS_ID_SIZE, "%s-pcs-mii", ndev->name);
 		pcs_bus = devm_mdio_regmap_register(&pdev->dev, &mrc);
-- 
2.40.1