Subject: [PATCH AUTOSEL 5.13 027/189] net: mdio: ipq8064: add regmap config to disable REGCACHE

From: Sasha Levin <[email-masked]>
Date: Tue, 6 Jul 2021 07:11:27 -0400

From: Ansuel Smith <[email-masked]>

[ Upstream commit b097bea10215315e8ee17f88b4c1bbb521b1878c ]

mdio drivers should not use REGCHACHE. Also disable locking since it's
handled by the mdio users and regmap is always accessed atomically.

Signed-off-by: Ansuel Smith <[email-masked]>
Reviewed-by: Florian Fainelli <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
Signed-off-by: Sasha Levin <[email-masked]>
---
 drivers/net/mdio/mdio-ipq8064.c | 34 +++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/net/mdio/mdio-ipq8064.c b/drivers/net/mdio/mdio-ipq8064.c
index 8fe8f0119fc1..8de11f35ac1e 100644
--- a/drivers/net/mdio/mdio-ipq8064.c
+++ b/drivers/net/mdio/mdio-ipq8064.c
@@ -7,10 +7,9 @@
 
 #include <linux/delay.h>
 #include <linux/kernel.h>
-#include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of_mdio.h>
-#include <linux/phy.h>
+#include <linux/of_address.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 
@@ -96,14 +95,34 @@ ipq8064_mdio_write(struct mii_bus *bus, int phy_addr, int reg_offset, u16 data)
 	return ipq8064_mdio_wait_busy(priv);
 }
 
+static const struct regmap_config ipq8064_mdio_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.can_multi_write = false,
+	/* the mdio lock is used by any user of this mdio driver */
+	.disable_locking = true,
+
+	.cache_type = REGCACHE_NONE,
+};
+
 static int
 ipq8064_mdio_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct ipq8064_mdio *priv;
+	struct resource res;
 	struct mii_bus *bus;
+	void __iomem *base;
 	int ret;
 
+	if (of_address_to_resource(np, 0, &res))
+		return -ENOMEM;
+
+	base = ioremap(res.start, resource_size(&res));
+	if (!base)
+		return -ENOMEM;
+
 	bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*priv));
 	if (!bus)
 		return -ENOMEM;
@@ -115,15 +134,10 @@ ipq8064_mdio_probe(struct platform_device *pdev)
 	bus->parent = &pdev->dev;
 
 	priv = bus->priv;
-	priv->base = device_node_to_regmap(np);
-	if (IS_ERR(priv->base)) {
-		if (priv->base == ERR_PTR(-EPROBE_DEFER))
-			return -EPROBE_DEFER;
-
-		dev_err(&pdev->dev, "error getting device regmap, error=%pe\n",
-			priv->base);
+	priv->base = devm_regmap_init_mmio(&pdev->dev, base,
+					   &ipq8064_mdio_regmap_config);
+	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
-	}
 
 	ret = of_mdiobus_register(bus, np);
 	if (ret)
-- 
2.30.2