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, 2 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/powerdomain.h b/arch/arm/mach-omap2/powerdomain.h
index 140c36074fed..9701ad5778b9 100644
--- a/arch/arm/mach-omap2/powerdomain.h
+++ b/arch/arm/mach-omap2/powerdomain.h
@@ -166,6 +166,7 @@ struct powerdomain {
  * @pwrdm_disable_hdwr_sar: Disable Hardware Save-Restore feature for a pd
  * @pwrdm_set_lowpwrstchange: Enable pd transitions from a shallow to deep sleep
  * @pwrdm_wait_transition: Wait for a pd state transition to complete
+ * @pwrdm_has_voltdm: Check if a voltdm association is needed
  *
  * Regarding @pwrdm_set_lowpwrstchange: On the OMAP2 and 3-family
  * chips, a powerdomain's power state is not allowed to directly
@@ -196,6 +197,7 @@ struct pwrdm_ops {
         int     (*pwrdm_disable_hdwr_sar)(struct powerdomain *pwrdm);
         int     (*pwrdm_set_lowpwrstchange)(struct powerdomain *pwrdm);
         int     (*pwrdm_wait_transition)(struct powerdomain *pwrdm);
+        int     (*pwrdm_has_voltdm)(void);
 };
 
 int pwrdm_register_platform_funcs(struct pwrdm_ops *custom_funcs);