OMAP4: clock data: Add control for pad_clks_ck and slimbus_clk

The gating of pad_clks and slimbus_ck is controlled by the PRCM, but
since the clock source is external, this is the SW responsability
to gate / un-gate it when the mcpdm or slimbus module need to be used.
There is no autogating possible with such external clock.

Add SW control to enable / disable this SW gating in the pad_clks_ck
and slimbus_clk clock node.

Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: Sebastien Guiriec <s-guiriec@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Rajendra Nayak <rnayak@ti.com>

arch/arm/mach-omap2/clock44xx_data.c

@@ -53,7 +53,9 @@ static struct clk extalt_clkin_ck = {
 static struct clk pad_clks_ck = {
 	.name		= "pad_clks_ck",
 	.rate		= 12000000,
-	.ops		= &clkops_null,
+	.ops            = &clkops_omap2_dflt,
+	.enable_reg     = OMAP4430_CM_CLKSEL_ABE,
+	.enable_bit     = OMAP4430_PAD_CLKS_GATE_SHIFT,
 };
 
 static struct clk pad_slimbus_core_clks_ck = {
@@ -71,7 +73,9 @@ static struct clk secure_32k_clk_src_ck = {
 static struct clk slimbus_clk = {
 	.name		= "slimbus_clk",
 	.rate		= 12000000,
-	.ops		= &clkops_null,
+	.ops            = &clkops_omap2_dflt,
+	.enable_reg     = OMAP4430_CM_CLKSEL_ABE,
+	.enable_bit     = OMAP4430_SLIMBUS_CLK_GATE_SHIFT,
 };
 
 static struct clk sys_32k_ck = {