[PATCH v9 13/13] powercap: arm_scmi: Synthetic zone enable/disable

[Philip Radford]

The synthetic instance root contols the same set of top-level SCMI domains
already handled by the control-type enable/disable helpers previously
introduced.

Add synthetic zone enabled attribute to the existing per-instance helpers
instead of duplicating the enable-state tracking and rollback logic.

Signed-off-by: Philip Radford <philip.radford at arm.com>
---
V8->V9
- Added mutex lock to instance_root_set_enable and instance_root_get_enable
---
 drivers/powercap/arm_scmi_powercap.c | 31 ++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/powercap/arm_scmi_powercap.c b/drivers/powercap/arm_scmi_powercap.c
index aac0b00490b2..f42b1e8d228a 100644
--- a/drivers/powercap/arm_scmi_powercap.c
+++ b/drivers/powercap/arm_scmi_powercap.c
@@ -499,10 +499,41 @@ static int instance_root_get_constraint(struct powercap_zone *pz, int cid, u64 *
 	return -EOPNOTSUPP;
 }
 
+static int instance_root_set_enable(struct powercap_zone *pz, bool mode)
+{
+	struct scmi_powercap_root *pr = to_scmi_powercap_root(pz);
+	int ret;
+
+	mutex_lock(&scmi_powercap_roots_lock);
+	ret = scmi_powercap_set_root_children_enable_state(pr, mode);
+	mutex_unlock(&scmi_powercap_roots_lock);
+
+	return ret;
+}
+
+static int instance_root_get_enable(struct powercap_zone *pz, bool *mode)
+{
+	struct scmi_powercap_root *pr = to_scmi_powercap_root(pz);
+	int ret;
+
+	if (!mode)
+		return -EINVAL;
+
+	mutex_lock(&scmi_powercap_roots_lock);
+	ret = scmi_powercap_read_root_children_enable_state(pr, mode);
+	if (!ret)
+		pr->enabled = *mode;
+	mutex_unlock(&scmi_powercap_roots_lock);
+
+	return ret;
+}
+
 static const struct powercap_zone_ops instance_root_ops = {
 	.get_max_power_range_uw = scmi_powercap_get_max_power_range_uw,
 	.get_power_uw = instance_root_get_power_uw,
 	.release = instance_root_release,
+	.set_enable = instance_root_set_enable,
+	.get_enable = instance_root_get_enable,
 };
 
 static const struct powercap_zone_constraint_ops instance_root_const_ops = {
-- 
2.25.1