net fec: do not depend on grouped clocks

the current i.MX clock support groups together unrelated clocks
to a single clock which is then used by the driver. This can't
be accomplished with the generic clock framework so we instead
request the individual clocks in the driver. For i.MX there are
generally three different clocks:

ipg: bus clock (needed to access registers)
ahb: dma relevant clock, sometimes referred to as hclk in the datasheet
per: bit clock, pixel clock

This patch changes the driver to request the individual clocks.
Currently all clk_get will get the same clock until the SoCs
are converted to the generic clock framework

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c
index a12b3f5bc025a1dd84d80d51ab7d6ecf29f7f6c9..b2494637cb60dfded6e1a03157c75160cd248839 100644 (file)
--- a/drivers/net/ethernet/freescale/fec.c
+++ b/drivers/net/ethernet/freescale/fec.c
@@ -206,7 +206,8 @@ struct fec_enet_private {
 
        struct net_device *netdev;
 
-       struct clk *clk;
+       struct clk *clk_ipg;
+       struct clk *clk_ahb;
 
        /* The saved address of a sent-in-place packet/buffer, for skfree(). */
        unsigned char *tx_bounce[TX_RING_SIZE];
@@ -1064,7 +1065,7 @@ static int fec_enet_mii_init(struct platform_device *pdev)
         * Reference Manual has an error on this, and gets fixed on i.MX6Q
         * document.
         */
-       fep->phy_speed = DIV_ROUND_UP(clk_get_rate(fep->clk), 5000000);
+       fep->phy_speed = DIV_ROUND_UP(clk_get_rate(fep->clk_ahb), 5000000);
        if (id_entry->driver_data & FEC_QUIRK_ENET_MAC)
                fep->phy_speed--;
        fep->phy_speed <<= 1;
@@ -1609,12 +1610,20 @@ fec_probe(struct platform_device *pdev)
                }
        }
 
-       fep->clk = clk_get(&pdev->dev, NULL);
-       if (IS_ERR(fep->clk)) {
-               ret = PTR_ERR(fep->clk);
+       fep->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
+       if (IS_ERR(fep->clk_ipg)) {
+               ret = PTR_ERR(fep->clk_ipg);
                goto failed_clk;
        }
-       clk_prepare_enable(fep->clk);
+
+       fep->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
+       if (IS_ERR(fep->clk_ahb)) {
+               ret = PTR_ERR(fep->clk_ahb);
+               goto failed_clk;
+       }
+
+       clk_prepare_enable(fep->clk_ahb);
+       clk_prepare_enable(fep->clk_ipg);
 
        ret = fec_enet_init(ndev);
        if (ret)
@@ -1637,8 +1646,8 @@ failed_register:
        fec_enet_mii_remove(fep);
 failed_mii_init:
 failed_init:
-       clk_disable_unprepare(fep->clk);
-       clk_put(fep->clk);
+       clk_disable_unprepare(fep->clk_ahb);
+       clk_disable_unprepare(fep->clk_ipg);
 failed_clk:
        for (i = 0; i < FEC_IRQ_NUM; i++) {
                irq = platform_get_irq(pdev, i);
@@ -1670,8 +1679,8 @@ fec_drv_remove(struct platform_device *pdev)
                if (irq > 0)
                        free_irq(irq, ndev);
        }
-       clk_disable_unprepare(fep->clk);
-       clk_put(fep->clk);
+       clk_disable_unprepare(fep->clk_ahb);
+       clk_disable_unprepare(fep->clk_ipg);
        iounmap(fep->hwp);
        free_netdev(ndev);
 
@@ -1695,7 +1704,8 @@ fec_suspend(struct device *dev)
                fec_stop(ndev);
                netif_device_detach(ndev);
        }
-       clk_disable_unprepare(fep->clk);
+       clk_disable_unprepare(fep->clk_ahb);
+       clk_disable_unprepare(fep->clk_ipg);
 
        return 0;
 }
@@ -1706,7 +1716,8 @@ fec_resume(struct device *dev)
        struct net_device *ndev = dev_get_drvdata(dev);
        struct fec_enet_private *fep = netdev_priv(ndev);
 
-       clk_prepare_enable(fep->clk);
+       clk_prepare_enable(fep->clk_ahb);
+       clk_prepare_enable(fep->clk_ipg);
        if (netif_running(ndev)) {
                fec_restart(ndev, fep->full_duplex);
                netif_device_attach(ndev);