stmmac: Add device-tree support
Stefan Roese [Tue, 13 Mar 2012 04:56:37 +0000 (04:56 +0000)]
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>

Documentation/devicetree/bindings/net/stmmac.txt [new file with mode: 0644]
drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
new file mode 100644 (file)
index 0000000..1f62623
--- /dev/null
@@ -0,0 +1,28 @@
+* STMicroelectronics 10/100/1000 Ethernet driver (GMAC)
+
+Required properties:
+- compatible: Should be "st,spear600-gmac"
+- reg: Address and length of the register set for the device
+- interrupt-parent: Should be the phandle for the interrupt controller
+  that services interrupts for this device
+- interrupts: Should contain the STMMAC interrupts
+- interrupt-names: Should contain the interrupt names "macirq"
+  "eth_wake_irq" if this interrupt is supported in the "interrupts"
+  property
+- phy-mode: String, operation mode of the PHY interface.
+  Supported values are: "mii", "rmii", "gmii", "rgmii".
+
+Optional properties:
+- mac-address: 6 bytes, mac address
+
+Examples:
+
+       gmac0: ethernet@e0800000 {
+               compatible = "st,spear600-gmac";
+               reg = <0xe0800000 0x8000>;
+               interrupt-parent = <&vic1>;
+               interrupts = <24 23>;
+               interrupt-names = "macirq", "eth_wake_irq";
+               mac-address = [000000000000]; /* Filled in by U-Boot */
+               phy-mode = "gmii";
+       };
index 3aad981..116529a 100644 (file)
 
 #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),
                   },
 };