[PATCH net-next v3 2/3] dpll: zl3073x: refactor output pin frequency set for internal use

[Ivan Vecera <ivecera@redhat.com>]

Extract the frequency-setting logic from the dpll_pin_ops callback into
a separate unlocked helper __zl3073x_dpll_output_pin_frequency_set()
that can be called internally while the per-DPLL lock is already held.
The original callback becomes a thin wrapper that acquires the lock and
delegates.

This prepares for the PTP clock support patch where ptp_enable() needs
to set output pin frequency from an already-locked context.

Reviewed-by: Petr Oros <poros@redhat.com>
Tested-by: Chris du Quesnay <Chris.duQuesnay@microchip.com>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
---
 drivers/dpll/zl3073x/dpll.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/dpll/zl3073x/dpll.c b/drivers/dpll/zl3073x/dpll.c
index 0488ae6ac486c8..79433ba8bb4a4f 100644
--- a/drivers/dpll/zl3073x/dpll.c
+++ b/drivers/dpll/zl3073x/dpll.c
@@ -935,21 +935,17 @@ zl3073x_dpll_output_pin_frequency_get(const struct dpll_pin *dpll_pin,
 }
 
 static int
-zl3073x_dpll_output_pin_frequency_set(const struct dpll_pin *dpll_pin,
-				      void *pin_priv,
-				      const struct dpll_device *dpll,
-				      void *dpll_priv, u64 frequency,
-				      struct netlink_ext_ack *extack)
+__zl3073x_dpll_output_pin_frequency_set(struct zl3073x_dpll *zldpll,
+					struct zl3073x_dpll_pin *pin,
+					u64 frequency)
 {
-	struct zl3073x_dpll *zldpll = dpll_priv;
 	struct zl3073x_dev *zldev = zldpll->dev;
-	struct zl3073x_dpll_pin *pin = pin_priv;
 	const struct zl3073x_synth *synth;
 	u32 new_div, synth_freq;
 	struct zl3073x_out out;
 	u8 out_id;
 
-	guard(mutex)(&zldpll->lock);
+	lockdep_assert_held(&zldpll->lock);
 
 	out_id = zl3073x_output_pin_out_get(pin->id);
 	out = *zl3073x_out_state_get(zldev, out_id);
@@ -1010,6 +1006,21 @@ zl3073x_dpll_output_pin_frequency_set(const struct dpll_pin *dpll_pin,
 	return zl3073x_out_state_set(zldev, out_id, &out);
 }
 
+static int
+zl3073x_dpll_output_pin_frequency_set(const struct dpll_pin *dpll_pin,
+				      void *pin_priv,
+				      const struct dpll_device *dpll,
+				      void *dpll_priv, u64 frequency,
+				      struct netlink_ext_ack *extack)
+{
+	struct zl3073x_dpll *zldpll = dpll_priv;
+
+	guard(mutex)(&zldpll->lock);
+
+	return __zl3073x_dpll_output_pin_frequency_set(zldpll, pin_priv,
+						       frequency);
+}
+
 static int
 zl3073x_dpll_output_pin_phase_adjust_get(const struct dpll_pin *dpll_pin,
 					 void *pin_priv,
-- 
2.54.0