clock: add stmmac clock for ethernet driver

Signed-off-by: Steven Miao <realmz6@gmail.com>

arch/blackfin/mach-bf609/clock.c

@@ -220,6 +220,12 @@ unsigned long sys_clk_get_rate(struct clk *clk)
 	}
 }
 
+unsigned long dummy_get_rate(struct clk *clk)
+{
+	clk->parent->rate = clk_get_rate(clk->parent);
+	return clk->parent->rate;
+}
+
 unsigned long sys_clk_round_rate(struct clk *clk, unsigned long rate)
 {
 	unsigned long max_rate;
@@ -283,6 +289,10 @@ static struct clk_ops sys_clk_ops = {
 	.round_rate = sys_clk_round_rate,
 };
 
+static struct clk_ops dummy_clk_ops = {
+	.get_rate = dummy_get_rate,
+};
+
 static struct clk sys_clkin = {
 	.name       = "SYS_CLKIN",
 	.rate       = CONFIG_CLKIN_HZ,
@@ -364,6 +374,12 @@ static struct clk oclk = {
 	.parent     = &pll_clk,
 };
 
+static struct clk ethclk = {
+	.name       = "stmmaceth",
+	.parent     = &sclk0,
+	.ops	    = &dummy_clk_ops,
+};
+
 static struct clk_lookup bf609_clks[] = {
 	CLK(sys_clkin, NULL, "SYS_CLKIN"),
 	CLK(pll_clk, NULL, "PLLCLK"),
@@ -375,6 +391,7 @@ static struct clk_lookup bf609_clks[] = {
 	CLK(sclk1, NULL, "SCLK1"),
 	CLK(dclk, NULL, "DCLK"),
 	CLK(oclk, NULL, "OCLK"),
+	CLK(ethclk, NULL, "stmmaceth"),
 };
 
 int __init clk_init(void)