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

[Álvaro Fernández Rojas]

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

Signed-off-by: Álvaro Fernández Rojas <nolt...@gmail.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