ARM: OMAP: DRA7: powerdomain: Handle missing vc/vp

DRA7 belongs to the omap4plus devices which reuse the omap4_pwrdm_operations
ops for powerdomain control. DRA7 however has no VC/VP while all the
earlier omap4plus devices did.

So use the .pwrdm_has_voltdm() ops to pass this info on to the core.
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/mach-omap2/prm44xx.c

@@ -620,6 +620,15 @@ static int omap4_pwrdm_wait_transition(struct powerdomain *pwrdm)
 	return 0;
 }
 
+static int omap4_check_vcvp(void)
+{
+	/* No VC/VP on dra7xx devices */
+	if (soc_is_dra7xx())
+		return 0;
+
+	return 1;
+}
+
 struct pwrdm_ops omap4_pwrdm_operations = {
 	.pwrdm_set_next_pwrst	= omap4_pwrdm_set_next_pwrst,
 	.pwrdm_read_next_pwrst	= omap4_pwrdm_read_next_pwrst,
@@ -637,6 +646,7 @@ struct pwrdm_ops omap4_pwrdm_operations = {
 	.pwrdm_set_mem_onst	= omap4_pwrdm_set_mem_onst,
 	.pwrdm_set_mem_retst	= omap4_pwrdm_set_mem_retst,
 	.pwrdm_wait_transition	= omap4_pwrdm_wait_transition,
+	.pwrdm_has_voltdm	= omap4_check_vcvp,
 };
 
 /*