fec: Do not enable/disable optional clocks unconditionally

clk_enet_out and clk_ptp are optional clocks, so we should not enable/disable
them unconditionally.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/fec_main.c

@@ -2105,7 +2105,9 @@ fec_probe(struct platform_device *pdev)
 
 	clk_prepare_enable(fep->clk_ahb);
 	clk_prepare_enable(fep->clk_ipg);
+	if (fep->clk_enet_out)
 		clk_prepare_enable(fep->clk_enet_out);
+	if (fep->clk_ptp)
 		clk_prepare_enable(fep->clk_ptp);
 
 	fep->reg_phy = devm_regulator_get(&pdev->dev, "phy");
@@ -2179,7 +2181,9 @@ fec_probe(struct platform_device *pdev)
 failed_regulator:
 	clk_disable_unprepare(fep->clk_ahb);
 	clk_disable_unprepare(fep->clk_ipg);
+	if (fep->clk_enet_out)
 		clk_disable_unprepare(fep->clk_enet_out);
+	if (fep->clk_ptp)
 		clk_disable_unprepare(fep->clk_ptp);
 failed_clk:
 failed_ioremap:
@@ -2206,9 +2210,11 @@ fec_drv_remove(struct platform_device *pdev)
 	}
 	if (fep->reg_phy)
 		regulator_disable(fep->reg_phy);
+	if (fep->clk_ptp)
 		clk_disable_unprepare(fep->clk_ptp);
 	if (fep->ptp_clock)
 		ptp_clock_unregister(fep->ptp_clock);
+	if (fep->clk_enet_out)
 		clk_disable_unprepare(fep->clk_enet_out);
 	clk_disable_unprepare(fep->clk_ahb);
 	clk_disable_unprepare(fep->clk_ipg);
@@ -2228,6 +2234,7 @@ fec_suspend(struct device *dev)
 		fec_stop(ndev);
 		netif_device_detach(ndev);
 	}
+	if (fep->clk_enet_out)
 		clk_disable_unprepare(fep->clk_enet_out);
 	clk_disable_unprepare(fep->clk_ahb);
 	clk_disable_unprepare(fep->clk_ipg);
@@ -2251,6 +2258,7 @@ fec_resume(struct device *dev)
 			return ret;
 	}
 
+	if (fep->clk_enet_out)
 		clk_prepare_enable(fep->clk_enet_out);
 	clk_prepare_enable(fep->clk_ahb);
 	clk_prepare_enable(fep->clk_ipg);