dpll: add frequency monitoring callback ops

Add new callback operations for a dpll device:
- freq_monitor_get(..) - to obtain current state of frequency monitor
  feature from dpll device,
- freq_monitor_set(..) - to allow feature configuration.

Add new callback operation for a dpll pin:
- measured_freq_get(..) - to obtain the measured frequency in mHz.

Obtain the feature state value using the get callback and provide it to
the user if the device driver implements callbacks. The measured_freq_get
pin callback is only invoked when the frequency monitor is enabled.
The freq_monitor_get device callback is required when measured_freq_get
is provided by the driver.

Execute the set callback upon user requests.

Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Link: https://patch.msgid.link/20260402184057.1890514-3-ivecera@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/dpll.h b/include/linux/dpll.h
index 2ce295b46b8c..b7277a8b484d 100644
--- a/include/linux/dpll.h
+++ b/include/linux/dpll.h
@@ -52,6 +52,12 @@ struct dpll_device_ops {
 	int (*phase_offset_avg_factor_get)(const struct dpll_device *dpll,
 					   void *dpll_priv, u32 *factor,
 					   struct netlink_ext_ack *extack);
+	int (*freq_monitor_set)(const struct dpll_device *dpll, void *dpll_priv,
+				enum dpll_feature_state state,
+				struct netlink_ext_ack *extack);
+	int (*freq_monitor_get)(const struct dpll_device *dpll, void *dpll_priv,
+				enum dpll_feature_state *state,
+				struct netlink_ext_ack *extack);
 };
 
 struct dpll_pin_ops {
@@ -110,6 +116,10 @@ struct dpll_pin_ops {
 	int (*ffo_get)(const struct dpll_pin *pin, void *pin_priv,
 		       const struct dpll_device *dpll, void *dpll_priv,
 		       s64 *ffo, struct netlink_ext_ack *extack);
+	int (*measured_freq_get)(const struct dpll_pin *pin, void *pin_priv,
+				 const struct dpll_device *dpll,
+				 void *dpll_priv, u64 *measured_freq,
+				 struct netlink_ext_ack *extack);
 	int (*esync_set)(const struct dpll_pin *pin, void *pin_priv,
 			 const struct dpll_device *dpll, void *dpll_priv,
 			 u64 freq, struct netlink_ext_ack *extack);