sh_eth: add device tree support

Add support of the device tree probing for the Renesas SH-Mobile SoCs
documenting the device tree binding as necessary.

This work is loosely based on the original patch by Nobuhiro Iwamatsu
<nobuhiro.iwamatsu.yj@renesas.com>.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 121 insertions, 3 deletions

diff --git a/Documentation/devicetree/bindings/net/sh_eth.txt b/Documentation/devicetree/bindings/net/sh_eth.txt
new file mode 100644
index 000000000000..e7106b50dbdc
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/sh_eth.txt
@@ -0,0 +1,55 @@
+* Renesas Electronics SH EtherMAC
+
+This file provides information on what the device node for the SH EtherMAC
+interface contains.
+
+Required properties:
+- compatible: "renesas,gether-r8a7740" if the device is a part of R8A7740 SoC.
+              "renesas,ether-r8a7778"  if the device is a part of R8A7778 SoC.
+              "renesas,ether-r8a7779"  if the device is a part of R8A7779 SoC.
+              "renesas,ether-r8a7790"  if the device is a part of R8A7790 SoC.
+              "renesas,ether-r8a7791"  if the device is a part of R8A7791 SoC.
+              "renesas,ether-r7s72100" if the device is a part of R7S72100 SoC.
+- reg: offset and length of (1) the E-DMAC/feLic register block (required),
+       (2) the TSU register block (optional).
+- interrupts: interrupt specifier for the sole interrupt.
+- phy-mode: see ethernet.txt file in the same directory.
+- phy-handle: see ethernet.txt file in the same directory.
+- #address-cells: number of address cells for the MDIO bus, must be equal to 1.
+- #size-cells: number of size cells on the MDIO bus, must be equal to 0.
+- clocks: clock phandle and specifier pair.
+- pinctrl-0: phandle, referring to a default pin configuration node.
+
+Optional properties:
+- interrupt-parent: the phandle for the interrupt controller that services
+                    interrupts for this device.
+- pinctrl-names: pin configuration state name ("default").
+- renesas,no-ether-link: boolean, specify when a board does not provide a proper
+                         Ether LINK signal.
+- renesas,ether-link-active-low: boolean, specify when the Ether LINK signal is
+                                 active-low instead of normal active-high.
+
+Example (Lager board):
+
+        ethernet@ee700000 {
+                compatible = "renesas,ether-r8a7790";
+                reg = <0 0xee700000 0 0x400>;
+                interrupt-parent = <&gic>;
+                interrupts = <0 162 IRQ_TYPE_LEVEL_HIGH>;
+                clocks = <&mstp8_clks R8A7790_CLK_ETHER>;
+                phy-mode = "rmii";
+                phy-handle = <&phy1>;
+                pinctrl-0 = <&ether_pins>;
+                pinctrl-names = "default";
+                renesas,ether-link-active-low;
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                phy1: ethernet-phy@1 {
+                        reg = <1>;
+                        interrupt-parent = <&irqc0>;
+                        interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+                        pinctrl-0 = <&phy1_pins>;
+                        pinctrl-names = "default";
+                };
+        };
diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 88b40b514cb2..b1e6554f44bc 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1,8 +1,8 @@
 /*  SuperH Ethernet device driver
  *
  *  Copyright (C) 2006-2012 Nobuhiro Iwamatsu
- *  Copyright (C) 2008-2013 Renesas Solutions Corp.
- *  Copyright (C) 2013 Cogent Embedded, Inc.
+ *  Copyright (C) 2008-2014 Renesas Solutions Corp.
+ *  Copyright (C) 2013-2014 Cogent Embedded, Inc.
  *
  *  This program is free software; you can redistribute it and/or modify it
  *  under the terms and conditions of the GNU General Public License,
@@ -27,6 +27,10 @@
 #include <linux/platform_device.h>
 #include <linux/mdio-bitbang.h>
 #include <linux/netdevice.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/of_net.h>
 #include <linux/phy.h>
 #include <linux/cache.h>
 #include <linux/io.h>
@@ -2710,6 +2714,54 @@ static const struct net_device_ops sh_eth_netdev_ops_tsu = {
         .ndo_change_mtu         = eth_change_mtu,
 };
 
+#ifdef CONFIG_OF
+static struct sh_eth_plat_data *sh_eth_parse_dt(struct device *dev)
+{
+        struct device_node *np = dev->of_node;
+        struct sh_eth_plat_data *pdata;
+        struct device_node *phy;
+        const char *mac_addr;
+
+        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return NULL;
+
+        pdata->phy_interface = of_get_phy_mode(np);
+
+        phy = of_parse_phandle(np, "phy-handle", 0);
+        if (of_property_read_u32(phy, "reg", &pdata->phy))
+                return NULL;
+        pdata->phy_irq = irq_of_parse_and_map(phy, 0);
+
+        mac_addr = of_get_mac_address(np);
+        if (mac_addr)
+                memcpy(pdata->mac_addr, mac_addr, ETH_ALEN);
+
+        pdata->no_ether_link =
+                of_property_read_bool(np, "renesas,no-ether-link");
+        pdata->ether_link_active_low =
+                of_property_read_bool(np, "renesas,ether-link-active-low");
+
+        return pdata;
+}
+
+static const struct of_device_id sh_eth_match_table[] = {
+        { .compatible = "renesas,gether-r8a7740", .data = &r8a7740_data },
+        { .compatible = "renesas,ether-r8a7778", .data = &r8a777x_data },
+        { .compatible = "renesas,ether-r8a7779", .data = &r8a777x_data },
+        { .compatible = "renesas,ether-r8a7790", .data = &r8a779x_data },
+        { .compatible = "renesas,ether-r8a7791", .data = &r8a779x_data },
+        { .compatible = "renesas,ether-r7s72100", .data = &r7s72100_data },
+        { }
+};
+MODULE_DEVICE_TABLE(of, sh_eth_match_table);
+#else
+static inline struct sh_eth_plat_data *sh_eth_parse_dt(struct device *dev)
+{
+        return NULL;
+}
+#endif
+
 static int sh_eth_drv_probe(struct platform_device *pdev)
 {
         int ret, devno = 0;
@@ -2763,6 +2815,8 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
         pm_runtime_enable(&pdev->dev);
         pm_runtime_resume(&pdev->dev);
 
+        if (pdev->dev.of_node)
+                pd = sh_eth_parse_dt(&pdev->dev);
         if (!pd) {
                 dev_err(&pdev->dev, "no platform data\n");
                 ret = -EINVAL;
@@ -2778,7 +2832,15 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
         mdp->ether_link_active_low = pd->ether_link_active_low;
 
         /* set cpu data */
-        mdp->cd = (struct sh_eth_cpu_data *)id->driver_data;
+        if (id) {
+                mdp->cd = (struct sh_eth_cpu_data *)id->driver_data;
+        } else  {
+                const struct of_device_id *match;
+
+                match = of_match_device(of_match_ptr(sh_eth_match_table),
+                                        &pdev->dev);
+                mdp->cd = (struct sh_eth_cpu_data *)match->data;
+        }
         mdp->reg_offset = sh_eth_get_register_offset(mdp->cd->register_type);
         sh_eth_set_default_cpu_data(mdp->cd);
 
@@ -2920,6 +2982,7 @@ static struct platform_driver sh_eth_driver = {
         .driver = {
                    .name = CARDNAME,
                    .pm = SH_ETH_PM_OPS,
+                   .of_match_table = of_match_ptr(sh_eth_match_table),
         },
 };