linux-kernel - [PATCH v4 22/42] net: cirrus: add DT support for Cirrus EP93xx

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Message-Id: <20230915-ep93xx-v4-22-a1d779dcec10@maquefel.me>
Date:   Fri, 15 Sep 2023 11:11:04 +0300
From:   Nikita Shubin via B4 Relay 
        <devnull+nikita.shubin.maquefel.me@...nel.org>
To:     Hartley Sweeten <hsweeten@...ionengravers.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Subject: [PATCH v4 22/42] net: cirrus: add DT support for Cirrus EP93xx

From: Nikita Shubin <nikita.shubin@...uefel.me>

- add OF ID match table
- get phy_id from the device tree, as part of mdio
- copy_addr is now always used, as there is no SoC/board that aren't
- dropped platform header

Reviewed-by: Andrew Lunn <andrew@...n.ch>
Tested-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Nikita Shubin <nikita.shubin@...uefel.me>
---
 drivers/net/ethernet/cirrus/ep93xx_eth.c | 63 ++++++++++++++++----------------
 1 file changed, 32 insertions(+), 31 deletions(-)

diff --git a/drivers/net/ethernet/cirrus/ep93xx_eth.c b/drivers/net/ethernet/cirrus/ep93xx_eth.c
index 8627ab19d470..3106dd97fe74 100644
--- a/drivers/net/ethernet/cirrus/ep93xx_eth.c
+++ b/drivers/net/ethernet/cirrus/ep93xx_eth.c
@@ -17,12 +17,11 @@
 #include <linux/interrupt.h>
 #include <linux/moduleparam.h>
 #include <linux/platform_device.h>
+#include <linux/of.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 
-#include <linux/platform_data/eth-ep93xx.h>
-
 #define DRV_MODULE_NAME		"ep93xx-eth"
 
 #define RX_QUEUE_ENTRIES	64
@@ -738,25 +737,6 @@ static const struct net_device_ops ep93xx_netdev_ops = {
 	.ndo_set_mac_address	= eth_mac_addr,
 };
 
-static struct net_device *ep93xx_dev_alloc(struct ep93xx_eth_data *data)
-{
-	struct net_device *dev;
-
-	dev = alloc_etherdev(sizeof(struct ep93xx_priv));
-	if (dev == NULL)
-		return NULL;
-
-	eth_hw_addr_set(dev, data->dev_addr);
-
-	dev->ethtool_ops = &ep93xx_ethtool_ops;
-	dev->netdev_ops = &ep93xx_netdev_ops;
-
-	dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
-
-	return dev;
-}
-
-
 static int ep93xx_eth_remove(struct platform_device *pdev)
 {
 	struct net_device *dev;
@@ -788,27 +768,47 @@ static int ep93xx_eth_remove(struct platform_device *pdev)
 
 static int ep93xx_eth_probe(struct platform_device *pdev)
 {
-	struct ep93xx_eth_data *data;
 	struct net_device *dev;
 	struct ep93xx_priv *ep;
 	struct resource *mem;
+	void __iomem *base_addr;
+	struct device_node *np;
+	u32 phy_id;
 	int irq;
 	int err;
 
 	if (pdev == NULL)
 		return -ENODEV;
-	data = dev_get_platdata(&pdev->dev);
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	irq = platform_get_irq(pdev, 0);
 	if (!mem || irq < 0)
 		return -ENXIO;
 
-	dev = ep93xx_dev_alloc(data);
+	base_addr = ioremap(mem->start, resource_size(mem));
+	if (!base_addr)
+		return dev_err_probe(&pdev->dev, -EIO, "Failed to ioremap ethernet registers\n");
+
+	np = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
+	if (!np)
+		return dev_err_probe(&pdev->dev, -ENODEV, "Please provide \"phy-handle\"\n");
+
+	err = of_property_read_u32(np, "reg", &phy_id);
+	of_node_put(np);
+	if (err)
+		return dev_err_probe(&pdev->dev, -ENOENT, "Failed to locate \"phy_id\"\n");
+
+	dev = alloc_etherdev(sizeof(struct ep93xx_priv));
 	if (dev == NULL) {
 		err = -ENOMEM;
 		goto err_out;
 	}
+
+	eth_hw_addr_set(dev, base_addr + 0x50);
+	dev->ethtool_ops = &ep93xx_ethtool_ops;
+	dev->netdev_ops = &ep93xx_netdev_ops;
+	dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
+
 	ep = netdev_priv(dev);
 	ep->dev = dev;
 	SET_NETDEV_DEV(dev, &pdev->dev);
@@ -824,15 +824,10 @@ static int ep93xx_eth_probe(struct platform_device *pdev)
 		goto err_out;
 	}
 
-	ep->base_addr = ioremap(mem->start, resource_size(mem));
-	if (ep->base_addr == NULL) {
-		dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
-		err = -EIO;
-		goto err_out;
-	}
+	ep->base_addr = base_addr;
 	ep->irq = irq;
 
-	ep->mii.phy_id = data->phy_id;
+	ep->mii.phy_id = phy_id;
 	ep->mii.phy_id_mask = 0x1f;
 	ep->mii.reg_num_mask = 0x1f;
 	ep->mii.dev = dev;
@@ -859,12 +854,18 @@ static int ep93xx_eth_probe(struct platform_device *pdev)
 	return err;
 }
 
+static const struct of_device_id ep93xx_eth_of_ids[] = {
+	{ .compatible = "cirrus,ep9301-eth" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ep93xx_eth_of_ids);
 
 static struct platform_driver ep93xx_eth_driver = {
 	.probe		= ep93xx_eth_probe,
 	.remove		= ep93xx_eth_remove,
 	.driver		= {
 		.name	= "ep93xx-eth",
+		.of_match_table = ep93xx_eth_of_ids,
 	},
 };
 

-- 
2.39.2