[PATCH net-next v2 05/10] net: dsa: microchip: extract ptp_get_pin

["Bastien Curutchet (Schneider Electric)" <bastien.curutchet@bootlin.com>]

The KSZ8463 supports periodic outputs but doesn't handle them in the same
way as the other KSZ switches. To add proper support for the KSZ8463, a
dedicated ksz8463_ptp_enable_perout() function needs to be created. This
function will use the same algorithm to select the output pin as the
common ksz_ptp_enable_perout() function.

Extract the pin selection algorithm into a dedicated function so it can
be used later by the KSZ8463 support.

Signed-off-by: Bastien Curutchet (Schneider Electric) <bastien.curutchet@bootlin.com>
---
 drivers/net/dsa/microchip/ksz_ptp.c | 31 ++++++++++++++++++++++---------
 1 file changed, 22 insertions(+), 9 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz_ptp.c b/drivers/net/dsa/microchip/ksz_ptp.c
index ea22601f6b26..f97ea9d69ebc 100644
--- a/drivers/net/dsa/microchip/ksz_ptp.c
+++ b/drivers/net/dsa/microchip/ksz_ptp.c
@@ -183,17 +183,11 @@ static int ksz_ptp_configure_perout(struct ksz_device *dev,
 	return 0;
 }
 
-static int ksz_ptp_enable_perout(struct ksz_device *dev,
-				 struct ptp_perout_request const *request,
-				 int on)
+static int ksz_ptp_get_pin(struct ksz_device *dev,
+			   struct ptp_perout_request const *request)
 {
 	struct ksz_ptp_data *ptp_data = &dev->ptp_data;
-	u64 req_pulse_width_ns;
-	u64 cycle_width_ns;
-	u64 pulse_width_ns;
-	int pin = 0;
-	u32 data32;
-	int ret;
+	int pin;
 
 	if (request->flags & ~PTP_PEROUT_DUTY_CYCLE)
 		return -EOPNOTSUPP;
@@ -206,6 +200,25 @@ static int ksz_ptp_enable_perout(struct ksz_device *dev,
 	if (pin < 0)
 		return -EINVAL;
 
+	return pin;
+}
+
+static int ksz_ptp_enable_perout(struct ksz_device *dev,
+				 struct ptp_perout_request const *request,
+				 int on)
+{
+	struct ksz_ptp_data *ptp_data = &dev->ptp_data;
+	u64 req_pulse_width_ns;
+	u64 cycle_width_ns;
+	u64 pulse_width_ns;
+	int pin = 0;
+	u32 data32;
+	int ret;
+
+	pin = ksz_ptp_get_pin(dev, request);
+	if (pin < 0)
+		return pin;
+
 	data32 = FIELD_PREP(PTP_GPIO_INDEX, pin) |
 		 FIELD_PREP(PTP_TOU_INDEX, request->index);
 	ret = ksz_rmw32(dev, REG_PTP_UNIT_INDEX__4,

-- 
2.55.0