arc_emac: add clock handling

This adds ability for the arc_emac to really handle its supplying clock.
To get the needed clock-frequency either a real clock or the previous
clock-frequency property must be provided.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Max Schwarz <max.schwarz@online.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 47 insertions, 13 deletions

diff --git a/Documentation/devicetree/bindings/net/arc_emac.txt b/Documentation/devicetree/bindings/net/arc_emac.txt
index 7fbb027218a1..a1d71eb43b20 100644
--- a/Documentation/devicetree/bindings/net/arc_emac.txt
+++ b/Documentation/devicetree/bindings/net/arc_emac.txt
@@ -4,11 +4,15 @@ Required properties:
 - compatible: Should be "snps,arc-emac"
 - reg: Address and length of the register set for the device
 - interrupts: Should contain the EMAC interrupts
-- clock-frequency: CPU frequency. It is needed to calculate and set polling
-period of EMAC.
 - max-speed: see ethernet.txt file in the same directory.
 - phy: see ethernet.txt file in the same directory.
 
+Clock handling:
+The clock frequency is needed to calculate and set polling period of EMAC.
+It must be provided by one of:
+- clock-frequency: CPU frequency.
+- clocks: reference to the clock supplying the EMAC.
+
 Child nodes of the driver are the individual PHY devices connected to the
 MDIO bus. They must have a "reg" property given the PHY address on the MDIO bus.
 
@@ -19,7 +23,11 @@ Examples:
                 reg = <0xc0fc2000 0x3c>;
                 interrupts = <6>;
                 mac-address = [ 00 11 22 33 44 55 ];
+
                 clock-frequency = <80000000>;
+                /* or */
+                clocks = <&emac_clock>;
+
                 max-speed = <100>;
                 phy = <&phy0>;
 
diff --git a/drivers/net/ethernet/arc/emac.h b/drivers/net/ethernet/arc/emac.h
index 928fac6dd10a..53f85bf71526 100644
--- a/drivers/net/ethernet/arc/emac.h
+++ b/drivers/net/ethernet/arc/emac.h
@@ -11,6 +11,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/netdevice.h>
 #include <linux/phy.h>
+#include <linux/clk.h>
 
 /* STATUS and ENABLE Register bit masks */
 #define TXINT_MASK      (1<<0)  /* Transmit interrupt */
@@ -131,6 +132,7 @@ struct arc_emac_priv {
         struct mii_bus *bus;
 
         void __iomem *regs;
+        struct clk *clk;
 
         struct napi_struct napi;
         struct net_device_stats stats;
diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
index 9747ddaf6ad2..d647a7d115ac 100644
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -649,13 +649,6 @@ static int arc_emac_probe(struct platform_device *pdev)
                 return -ENODEV;
         }
 
-        /* Get CPU clock frequency from device tree */
-        if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
-                                 &clock_frequency)) {
-                dev_err(&pdev->dev, "failed to retrieve <clock-frequency> from device tree\n");
-                return -EINVAL;
-        }
-
         /* Get IRQ from device tree */
         irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
         if (!irq) {
@@ -687,13 +680,32 @@ static int arc_emac_probe(struct platform_device *pdev)
         }
         dev_dbg(&pdev->dev, "Registers base address is 0x%p\n", priv->regs);
 
+        priv->clk = of_clk_get(pdev->dev.of_node, 0);
+        if (IS_ERR(priv->clk)) {
+                /* Get CPU clock frequency from device tree */
+                if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
+                                        &clock_frequency)) {
+                        dev_err(&pdev->dev, "failed to retrieve <clock-frequency> from device tree\n");
+                        err = -EINVAL;
+                        goto out_netdev;
+                }
+        } else {
+                err = clk_prepare_enable(priv->clk);
+                if (err) {
+                        dev_err(&pdev->dev, "failed to enable clock\n");
+                        goto out_clkget;
+                }
+
+                clock_frequency = clk_get_rate(priv->clk);
+        }
+
         id = arc_reg_get(priv, R_ID);
 
         /* Check for EMAC revision 5 or 7, magic number */
         if (!(id == 0x0005fd02 || id == 0x0007fd02)) {
                 dev_err(&pdev->dev, "ARC EMAC not detected, id=0x%x\n", id);
                 err = -ENODEV;
-                goto out_netdev;
+                goto out_clken;
         }
         dev_info(&pdev->dev, "ARC EMAC detected with id: 0x%x\n", id);
 
@@ -708,7 +720,7 @@ static int arc_emac_probe(struct platform_device *pdev)
                                ndev->name, ndev);
         if (err) {
                 dev_err(&pdev->dev, "could not allocate IRQ\n");
-                goto out_netdev;
+                goto out_clken;
         }
 
         /* Get MAC address from device tree */
@@ -729,7 +741,7 @@ static int arc_emac_probe(struct platform_device *pdev)
         if (!priv->rxbd) {
                 dev_err(&pdev->dev, "failed to allocate data buffers\n");
                 err = -ENOMEM;
-                goto out_netdev;
+                goto out_clken;
         }
 
         priv->txbd = priv->rxbd + RX_BD_NUM;
@@ -741,7 +753,7 @@ static int arc_emac_probe(struct platform_device *pdev)
         err = arc_mdio_probe(pdev, priv);
         if (err) {
                 dev_err(&pdev->dev, "failed to probe MII bus\n");
-                goto out_netdev;
+                goto out_clken;
         }
 
         priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0,
@@ -771,6 +783,12 @@ out_netif_api:
         priv->phy_dev = NULL;
 out_mdio:
         arc_mdio_remove(priv);
+out_clken:
+        if (!IS_ERR(priv->clk))
+                clk_disable_unprepare(priv->clk);
+out_clkget:
+        if (!IS_ERR(priv->clk))
+                clk_put(priv->clk);
 out_netdev:
         free_netdev(ndev);
         return err;
@@ -786,6 +804,12 @@ static int arc_emac_remove(struct platform_device *pdev)
         arc_mdio_remove(priv);
         unregister_netdev(ndev);
         netif_napi_del(&priv->napi);
+
+        if (!IS_ERR(priv->clk)) {
+                clk_disable_unprepare(priv->clk);
+                clk_put(priv->clk);
+        }
+
         free_netdev(ndev);
 
         return 0;