net: macb: Fix ETH not found when clock not support

For the boards such as smartweb on which the clock driver isn't
supported, the ethernet fail to be found when booting up with
the below log.
---8<---
Net:   No ethernet found.
--->8---

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Tested-by: Heiko Schocher <hs@denx.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/macb.c

@@ -113,7 +113,9 @@ struct macb_device {
 	struct mii_dev		*bus;
 
 #ifdef CONFIG_DM_ETH
+#ifdef CONFIG_CLK
 	unsigned long		pclk_rate;
+#endif
 	phy_interface_t		phy_interface;
 #endif
 };
@@ -756,7 +758,7 @@ static int _macb_write_hwaddr(struct macb_device *macb, unsigned char *enetaddr)
 static u32 macb_mdc_clk_div(int id, struct macb_device *macb)
 {
 	u32 config;
-#ifdef CONFIG_DM_ETH
+#if defined(CONFIG_DM_ETH) && defined(CONFIG_CLK)
 	unsigned long macb_hz = macb->pclk_rate;
 #else
 	unsigned long macb_hz = get_macb_pclk_rate(id);
@@ -778,7 +780,7 @@ static u32 gem_mdc_clk_div(int id, struct macb_device *macb)
 {
 	u32 config;
 
-#ifdef CONFIG_DM_ETH
+#if defined(CONFIG_DM_ETH) && defined(CONFIG_CLK)
 	unsigned long macb_hz = macb->pclk_rate;
 #else
 	unsigned long macb_hz = get_macb_pclk_rate(id);
@@ -1002,6 +1004,7 @@ static const struct eth_ops macb_eth_ops = {
 	.write_hwaddr	= macb_write_hwaddr,
 };
 
+#ifdef CONFIG_CLK
 static int macb_enable_clk(struct udevice *dev)
 {
 	struct macb_device *macb = dev_get_priv(dev);
@@ -1025,13 +1028,13 @@ static int macb_enable_clk(struct udevice *dev)
 
 	return 0;
 }
+#endif
 
 static int macb_eth_probe(struct udevice *dev)
 {
 	struct eth_pdata *pdata = dev_get_platdata(dev);
 	struct macb_device *macb = dev_get_priv(dev);
 	const char *phy_mode;
-	int ret;
 
 	phy_mode = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "phy-mode",
 			       NULL);
@@ -1044,9 +1047,11 @@ static int macb_eth_probe(struct udevice *dev)
 
 	macb->regs = (void *)pdata->iobase;
 
-	ret = macb_enable_clk(dev);
+#ifdef CONFIG_CLK
+	int ret = macb_enable_clk(dev);
 	if (ret)
 		return ret;
+#endif
 
 	_macb_eth_initialize(macb);