ARM: OMAP2+: Powerdomain: Remove the need to always have a voltdm associated to a pwrdm

The powerdomain framework currently expects all powerdomains to be associated with
a corresponding voltagedomain. For some SoCs' (like the already existing AM33xx
family, or for the upcoming AM437x and DRA7 SoCs') which
do not have a Voltage controller/Voltage Processor (neither the SR I2C
bus to communicate with the PMIC) there is no need for a Powerdomain to have
a voltage domain association since there is no auto-scaling of voltages possible
using the voltage FSM.

Extend the arch operations to add an api which the powerdomain core can
then use to identify if a voltdm lookup and association for a powerdomain
is really needed.

Acked-by: Nishanth Menon <nm@ti.com>
Acked-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Afzal Mohammed <afzal@ti.com> # am335x evm
Signed-off-by: Kevin Hilman <khilman@linaro.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 86babd740d41..e233dfcbc186 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -102,6 +102,10 @@ static int _pwrdm_register(struct powerdomain *pwrdm)
         if (_pwrdm_lookup(pwrdm->name))
                 return -EEXIST;
 
+        if (arch_pwrdm && arch_pwrdm->pwrdm_has_voltdm)
+                if (!arch_pwrdm->pwrdm_has_voltdm())
+                        goto skip_voltdm;
+
         voltdm = voltdm_lookup(pwrdm->voltdm.name);
         if (!voltdm) {
                 pr_err("powerdomain: %s: voltagedomain %s does not exist\n",
@@ -111,6 +115,7 @@ static int _pwrdm_register(struct powerdomain *pwrdm)
         pwrdm->voltdm.ptr = voltdm;
         INIT_LIST_HEAD(&pwrdm->voltdm_node);
         voltdm_add_pwrdm(voltdm, pwrdm);
+skip_voltdm:
         spin_lock_init(&pwrdm->_lock);
 
         list_add(&pwrdm->node, &pwrdm_list);