From a7420d142f61107f7486fee41d35ab8a3dcb2c0e Mon Sep 17 00:00:00 2001
From: Nikita Shubin <nikita.shubin@maquefel.me>
Date: Fri, 14 Oct 2022 13:01:38 +0300
Subject: [PATCH] net: cirrus: add DT support for Cirrus EP93xx

- find register range from the device tree
- get "copy_addr" from the device tree
- get phy_id from the device tree

Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
---
 drivers/net/ethernet/cirrus/ep93xx_eth.c | 49 +++++++++++++++++++++---
 1 file changed, 43 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/cirrus/ep93xx_eth.c b/drivers/net/ethernet/cirrus/ep93xx_eth.c
index 8627ab19d4703..b156cc75daad6 100644
--- a/drivers/net/ethernet/cirrus/ep93xx_eth.c
+++ b/drivers/net/ethernet/cirrus/ep93xx_eth.c
@@ -17,6 +17,8 @@
 #include <linux/interrupt.h>
 #include <linux/moduleparam.h>
 #include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/slab.h>
@@ -792,6 +794,8 @@ static int ep93xx_eth_probe(struct platform_device *pdev)
 	struct net_device *dev;
 	struct ep93xx_priv *ep;
 	struct resource *mem;
+	void __iomem *base_addr;
+	struct device_node *np;
 	int irq;
 	int err;
 
@@ -804,6 +808,38 @@ static int ep93xx_eth_probe(struct platform_device *pdev)
 	if (!mem || irq < 0)
 		return -ENXIO;
 
+	base_addr = ioremap(mem->start, resource_size(mem));
+	if (!base_addr) {
+		dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
+		return -EIO;
+	}
+
+	if (!data) {
+		np = pdev->dev.of_node;
+		if (IS_ENABLED(CONFIG_OF) && np) {
+			u32 phy_id;
+
+			data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+			if (!data)
+				return -ENOMEM;
+
+			if (of_property_read_bool(np, "copy_addr")) {
+				memcpy_fromio(data->dev_addr, base_addr + 0x50, 6);
+				dev_info(&pdev->dev, "MAC=%pM\n", data->dev_addr);
+			}
+
+			if (of_property_read_u32(np, "phy_id", &phy_id)) {
+				dev_err(&pdev->dev, "Failed to parse \"phy_id\"\n");
+				return -ENOENT;
+			}
+
+			data->phy_id = phy_id;
+		}
+	}
+
+	if (!data)
+		return -ENOENT;
+
 	dev = ep93xx_dev_alloc(data);
 	if (dev == NULL) {
 		err = -ENOMEM;
@@ -824,12 +860,7 @@ 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;
@@ -859,12 +890,18 @@ err_out:
 	return err;
 }
 
+static const struct of_device_id ep93xx_eth_of_ids[] = {
+	{ .compatible = "cirrus,ep9301-eth" },
+	{},
+};
+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,
 	},
 };
 
-- 
2.30.2