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From: Herve Codina <herve.codina@bootlin.com>
To: Herve Codina <herve.codina@bootlin.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Rob Herring <robh@kernel.org>,
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Cc: linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org,
	netdev@vger.kernel.org,
	linux-pci@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Allan Nielsen <allan.nielsen@microchip.com>,
	Steen Hegelund <steen.hegelund@microchip.com>,
	Luca Ceresoli <luca.ceresoli@bootlin.com>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Subject: [PATCH 07/17] net: mdio: mscc-miim: Handle the switch reset
Date: Tue, 30 Apr 2024 10:37:16 +0200
Message-ID: <20240430083730.134918-8-herve.codina@bootlin.com>
In-Reply-To: <20240430083730.134918-1-herve.codina@bootlin.com>
References: <20240430083730.134918-1-herve.codina@bootlin.com>
Precedence: bulk
MIME-Version: 1.0
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The mscc-miim device can be impacted by the switch reset, at least when
this device is part of the LAN966x PCI device.

Handle this newly added (optional) resets property.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
 drivers/net/mdio/mdio-mscc-miim.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c
index c29377c85307..6a6c1768f533 100644
--- a/drivers/net/mdio/mdio-mscc-miim.c
+++ b/drivers/net/mdio/mdio-mscc-miim.c
@@ -19,6 +19,7 @@
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/regmap.h>
+#include <linux/reset.h>
 
 #define MSCC_MIIM_REG_STATUS		0x0
 #define		MSCC_MIIM_STATUS_STAT_PENDING	BIT(2)
@@ -270,11 +271,18 @@ static int mscc_miim_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct regmap *mii_regmap, *phy_regmap;
+	struct reset_control *reset;
 	struct device *dev = &pdev->dev;
 	struct mscc_miim_dev *miim;
 	struct mii_bus *bus;
 	int ret;
 
+	reset = devm_reset_control_get_optional_shared(dev, "switch");
+	if (IS_ERR(reset))
+		return dev_err_probe(dev, PTR_ERR(reset), "Failed to get reset\n");
+
+	reset_control_reset(reset);
+
 	mii_regmap = ocelot_regmap_from_resource(pdev, 0,
 						 &mscc_miim_regmap_config);
 	if (IS_ERR(mii_regmap))
-- 
2.44.0