clocks: qcom: Add clock enable callback support

Drivers like USB, ethernet etc. uses ".enable" hook to enable clocks.
So add corresponding support for Qcom clock drivers.

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>

arch/arm/mach-snapdragon/clock-apq8016.c

@@ -111,3 +111,8 @@ ulong msm_set_rate(struct clk *clk, ulong rate)
 		return 0;
 	}
 }
+
+int msm_enable(struct clk *clk)
+{
+	return 0;
+}

arch/arm/mach-snapdragon/clock-apq8096.c

@@ -93,3 +93,8 @@ ulong msm_set_rate(struct clk *clk, ulong rate)
 		return 0;
 	}
 }
+
+int msm_enable(struct clk *clk)
+{
+	return 0;
+}

arch/arm/mach-snapdragon/clock-qcs404.c

@@ -77,3 +77,8 @@ ulong msm_set_rate(struct clk *clk, ulong rate)
 
 	return 0;
 }
+
+int msm_enable(struct clk *clk)
+{
+	return 0;
+}

arch/arm/mach-snapdragon/clock-sdm845.c

@@ -91,3 +91,8 @@ ulong msm_set_rate(struct clk *clk, ulong rate)
 		return 0;
 	}
 }
+
+int msm_enable(struct clk *clk)
+{
+	return 0;
+}

arch/arm/mach-snapdragon/clock-snapdragon.c

@@ -20,6 +20,7 @@
 #define CBCR_BRANCH_OFF_BIT     BIT(31)
 
 extern ulong msm_set_rate(struct clk *clk, ulong rate);
+extern int msm_enable(struct clk *clk);
 
 /* Enable clock controlled by CBC soft macro */
 void clk_enable_cbc(phys_addr_t cbcr)
@@ -126,8 +127,14 @@ static ulong msm_clk_set_rate(struct clk *clk, ulong rate)
 	return msm_set_rate(clk, rate);
 }
 
+static int msm_clk_enable(struct clk *clk)
+{
+	return msm_enable(clk);
+}
+
 static struct clk_ops msm_clk_ops = {
 	.set_rate = msm_clk_set_rate,
+	.enable = msm_clk_enable,
 };
 
 static const struct udevice_id msm_clk_ids[] = {