stmmac: Add device-tree support

This patch adds support to configure the STMMAC ethernet driver via
device-tree instead of platform_data.

Currently, only the properties needed on SPEAr600 are provided. All
other properties should be added once needed on other platforms.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 72 insertions, 2 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 3aad9810237c..116529a366b2 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -24,8 +24,48 @@
 
 #include <linux/platform_device.h>
 #include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_net.h>
 #include "stmmac.h"
 
+#ifdef CONFIG_OF
+static int __devinit stmmac_probe_config_dt(struct platform_device *pdev,
+                                            struct plat_stmmacenet_data *plat,
+                                            const char **mac)
+{
+        struct device_node *np = pdev->dev.of_node;
+
+        if (!np)
+                return -ENODEV;
+
+        *mac = of_get_mac_address(np);
+        plat->interface = of_get_phy_mode(np);
+        plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
+                                           sizeof(struct stmmac_mdio_bus_data),
+                                           GFP_KERNEL);
+
+        /*
+         * Currently only the properties needed on SPEAr600
+         * are provided. All other properties should be added
+         * once needed on other platforms.
+         */
+        if (of_device_is_compatible(np, "st,spear600-gmac")) {
+                plat->pbl = 8;
+                plat->has_gmac = 1;
+                plat->pmt = 1;
+        }
+
+        return 0;
+}
+#else
+static int __devinit stmmac_probe_config_dt(struct platform_device *pdev,
+                                            struct plat_stmmacenet_data *plat,
+                                            const char **mac)
+{
+        return -ENOSYS;
+}
+#endif /* CONFIG_OF */
+
 /**
  * stmmac_pltfr_probe
  * @pdev: platform device pointer
@@ -39,7 +79,8 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
         struct resource *res;
         void __iomem *addr = NULL;
         struct stmmac_priv *priv = NULL;
-        struct plat_stmmacenet_data *plat_dat;
+        struct plat_stmmacenet_data *plat_dat = NULL;
+        const char *mac = NULL;
 
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         if (!res)
@@ -58,7 +99,25 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
                 ret = -ENOMEM;
                 goto out_release_region;
         }
-        plat_dat = pdev->dev.platform_data;
+
+        if (pdev->dev.of_node) {
+                plat_dat = devm_kzalloc(&pdev->dev,
+                                        sizeof(struct plat_stmmacenet_data),
+                                        GFP_KERNEL);
+                if (!plat_dat) {
+                        pr_err("%s: ERROR: no memory", __func__);
+                        ret = -ENOMEM;
+                        goto out_unmap;
+                }
+
+                ret = stmmac_probe_config_dt(pdev, plat_dat, &mac);
+                if (ret) {
+                        pr_err("%s: main dt probe failed", __func__);
+                        goto out_unmap;
+                }
+        } else {
+                plat_dat = pdev->dev.platform_data;
+        }
 
         /* Custom initialisation (if needed)*/
         if (plat_dat->init) {
@@ -73,6 +132,10 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
                 goto out_unmap;
         }
 
+        /* Get MAC address if available (DT) */
+        if (mac)
+                memcpy(priv->dev->dev_addr, mac, ETH_ALEN);
+
         /* Get the MAC information */
         priv->dev->irq = platform_get_irq_byname(pdev, "macirq");
         if (priv->dev->irq == -ENXIO) {
@@ -178,6 +241,12 @@ static const struct dev_pm_ops stmmac_pltfr_pm_ops = {
 static const struct dev_pm_ops stmmac_pltfr_pm_ops;
 #endif /* CONFIG_PM */
 
+static const struct of_device_id stmmac_dt_ids[] = {
+        { .compatible = "st,spear600-gmac", },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, stmmac_dt_ids);
+
 static struct platform_driver stmmac_driver = {
         .probe = stmmac_pltfr_probe,
         .remove = stmmac_pltfr_remove,
@@ -185,6 +254,7 @@ static struct platform_driver stmmac_driver = {
                    .name = STMMAC_RESOURCE_NAME,
                    .owner = THIS_MODULE,
                    .pm = &stmmac_pltfr_pm_ops,
+                   .of_match_table = of_match_ptr(stmmac_dt_ids),
                    },
 };