linux-kernel - [PATCH] phy: ti: gmii-sel: Do not use syscon helper to build regmap

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Message-ID: <20250123182234.597665-1-afd@ti.com>
Date: Thu, 23 Jan 2025 12:22:34 -0600
From: Andrew Davis <afd@...com>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
        Vinod
 Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>
CC: <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Andrew
 Davis <afd@...com>
Subject: [PATCH] phy: ti: gmii-sel: Do not use syscon helper to build regmap

The syscon helper device_node_to_regmap() is used to fetch a regmap
registered to a device node. It also currently creates this regmap
if the node did not already have a regmap associated with it. This
should only be used on "syscon" nodes. This driver is not such a
device and instead uses device_node_to_regmap() on its own node as
a hacky way to create a regmap for itself.

This will not work going forward and so we should create our regmap
the normal way by defining our regmap_config, fetching our memory
resource, then using the normal regmap_init_mmio() function.

Signed-off-by: Andrew Davis <afd@...com>
---
 drivers/phy/ti/phy-gmii-sel.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/ti/phy-gmii-sel.c b/drivers/phy/ti/phy-gmii-sel.c
index e0ca59ae31531..ff5d5e29629fa 100644
--- a/drivers/phy/ti/phy-gmii-sel.c
+++ b/drivers/phy/ti/phy-gmii-sel.c
@@ -424,6 +424,12 @@ static int phy_gmii_sel_init_ports(struct phy_gmii_sel_priv *priv)
 	return 0;
 }
 
+static const struct regmap_config phy_gmii_sel_regmap_cfg = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
 static int phy_gmii_sel_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -468,7 +474,14 @@ static int phy_gmii_sel_probe(struct platform_device *pdev)
 
 	priv->regmap = syscon_node_to_regmap(node->parent);
 	if (IS_ERR(priv->regmap)) {
-		priv->regmap = device_node_to_regmap(node);
+		void __iomem *base;
+
+		base = devm_platform_ioremap_resource(pdev, 0);
+		if (IS_ERR(base))
+			return dev_err_probe(dev, PTR_ERR(base),
+					     "failed to get base memory resource\n");
+
+		priv->regmap = regmap_init_mmio(dev, base, &phy_gmii_sel_regmap_cfg);
 		if (IS_ERR(priv->regmap))
 			return dev_err_probe(dev, PTR_ERR(priv->regmap),
 					     "Failed to get syscon\n");
-- 
2.39.2