linux-kernel - [PATCH v2 net-next] net: dsa: b53: mmap: Add device tree support

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Message-Id: <20210315151140.12636-1-noltari@gmail.com>
Date:   Mon, 15 Mar 2021 16:11:40 +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 v2 net-next] 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>
---
 v2: add change suggested by Florian Fainelli (less "OF-centric") and replace
  brcm,ports property with a ports child scan.

 drivers/net/dsa/b53/b53_mmap.c | 54 ++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/drivers/net/dsa/b53/b53_mmap.c b/drivers/net/dsa/b53/b53_mmap.c
index c628d0980c0b..94a4e3929ebf 100644
--- a/drivers/net/dsa/b53/b53_mmap.c
+++ b/drivers/net/dsa/b53/b53_mmap.c
@@ -16,6 +16,7 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include <linux/bits.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/io.h>
@@ -228,11 +229,64 @@ 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 device_node *of_ports, *of_port;
+	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_ports = of_get_child_by_name(np, "ports");
+	if (!of_ports) {
+		dev_err(dev, "no ports child node found\n");
+		return -EINVAL;
+	}
+
+	for_each_available_child_of_node(of_ports, of_port) {
+		u32 reg;
+
+		if (of_property_read_u32(of_port, "reg", &reg))
+			continue;
+
+		if (reg < B53_CPU_PORT)
+			pdata->enabled_ports |= BIT(reg);
+	}
+
+	*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;
+	int ret;
+
+	if (!pdata && np) {
+		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