linux-kernel - [PATCH] net: dsa: b53: mmap: Add device tree support

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Date:   Mon,  8 Mar 2021 19:07:15 +0100
From:   Álvaro Fernández Rojas 
        <noltari@...il.com>
To:     jonas.gorski@...il.com, Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Álvaro Fernández Rojas 
        <noltari@...il.com>
Subject: [PATCH] net: dsa: b53: mmap: Add device tree support

Add device tree support to b53_mmap.c while keeping platform devices support.

Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
---
 drivers/net/dsa/b53/b53_mmap.c | 36 ++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/net/dsa/b53/b53_mmap.c b/drivers/net/dsa/b53/b53_mmap.c
index c628d0980c0b..b897b4263930 100644
--- a/drivers/net/dsa/b53/b53_mmap.c
+++ b/drivers/net/dsa/b53/b53_mmap.c
@@ -228,12 +228,48 @@ static const struct b53_io_ops b53_mmap_ops = {
 	.write64 = b53_mmap_write64,
 };
 
+static int b53_mmap_probe_of(struct platform_device *pdev,
+			     struct b53_platform_data **ppdata)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct b53_platform_data *pdata;
+	void __iomem *mem;
+
+	mem = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(mem))
+		return PTR_ERR(mem);
+
+	pdata = devm_kzalloc(dev, sizeof(struct b53_platform_data),
+			     GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	pdata->regs = mem;
+	pdata->chip_id = BCM63XX_DEVICE_ID;
+	pdata->big_endian = of_property_read_bool(np, "big-endian");
+	of_property_read_u16(np, "brcm,ports", &pdata->enabled_ports);
+
+	*ppdata = pdata;
+
+	return 0;
+}
+
 static int b53_mmap_probe(struct platform_device *pdev)
 {
+	struct device_node *np = pdev->dev.of_node;
 	struct b53_platform_data *pdata = pdev->dev.platform_data;
 	struct b53_mmap_priv *priv;
 	struct b53_device *dev;
 
+	if (np) {
+		int ret = b53_mmap_probe_of(pdev, &pdata);
+		if (ret) {
+			dev_err(&pdev->dev, "OF probe error\n");
+			return ret;
+		}
+	}
+
 	if (!pdata)
 		return -EINVAL;
 
-- 
2.20.1