bmips: add experimental ethernet support

This adds experimental ethernet support for BCM6318, BCM6328, BCM6362, BCM6368
and BCM63268.
BCM6358 needs a different driver, so there's no support for now.

Working devices:
- Comtrend AR-5315u
- Comtrend AR-5387un
- Comtrend VR-3025u
- Comtrend VR-3032u

Not working devices:
- Netgear DGND3700 v2 (no idea on how the external switch is connected)
- Huawei HG556a ver B (BCM6358 needs a separate driveer)

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 82 insertions, 0 deletions

diff --git a/target/linux/bmips/patches-5.10/501-net-dsa-b53-mmap-Add-device-tree-support.patch b/target/linux/bmips/patches-5.10/501-net-dsa-b53-mmap-Add-device-tree-support.patch
new file mode 100644
index 0000000000..e9eb87cb5c
--- /dev/null
+++ b/target/linux/bmips/patches-5.10/501-net-dsa-b53-mmap-Add-device-tree-support.patch
@@ -0,0 +1,82 @@
+From f5419e7f362ae1c462baf28a2da7360267f8e4f9 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
+Date: Mon, 1 Mar 2021 07:32:32 +0100
+Subject: [PATCH 2/3] net: dsa: b53: mmap: Add device tree support
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Add device tree support to b53_mmap.c while keeping platform devices support.
+
+Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
+---
+ drivers/net/dsa/b53/b53_mmap.c | 36 ++++++++++++++++++++++++++++++++++
+ 1 file changed, 36 insertions(+)
+
+--- a/drivers/net/dsa/b53/b53_mmap.c
++++ b/drivers/net/dsa/b53/b53_mmap.c
+@@ -228,12 +228,64 @@ static const struct b53_io_ops b53_mmap_
+ 	.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;
+ 
++	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;
+