Return -EOPNOTSUPP early in esync_get callbacks when esync is not
supported instead of conditionally populating the range at the end.
This simplifies the control flow by removing the finish label/goto
in the output variant and the conditional range assignment in both
input and output variants.

Replace open-coded N-div signal format switch statements with
zl3073x_out_is_ndiv() helper in esync_get, esync_set and
frequency_set callbacks.

Reviewed-by: Petr Oros <poros@redhat.com>
Reviewed-by: Prathosh Satish <Prathosh.Satish@microchip.com>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
---
 drivers/dpll/zl3073x/dpll.c | 64 ++++++++++++-------------------------
 1 file changed, 20 insertions(+), 44 deletions(-)

diff --git a/drivers/dpll/zl3073x/dpll.c b/drivers/dpll/zl3073x/dpll.c
index a29f606318f6d..2476c14028210 100644
--- a/drivers/dpll/zl3073x/dpll.c
+++ b/drivers/dpll/zl3073x/dpll.c
@@ -131,6 +131,12 @@ zl3073x_dpll_input_pin_esync_get(const struct dpll_pin *dpll_pin,
 	ref_id = zl3073x_input_pin_ref_get(pin->id);
 	ref = zl3073x_ref_state_get(zldev, ref_id);
 
+	if (!pin->esync_control || zl3073x_ref_freq_get(ref) <= 1)
+		return -EOPNOTSUPP;
+
+	esync->range = esync_freq_ranges;
+	esync->range_num = ARRAY_SIZE(esync_freq_ranges);
+
 	switch (FIELD_GET(ZL_REF_SYNC_CTRL_MODE, ref->sync_ctrl)) {
 	case ZL_REF_SYNC_CTRL_MODE_50_50_ESYNC_25_75:
 		esync->freq = ref->esync_n_div == ZL_REF_ESYNC_DIV_1HZ ? 1 : 0;
@@ -142,17 +148,6 @@ zl3073x_dpll_input_pin_esync_get(const struct dpll_pin *dpll_pin,
 		break;
 	}
 
-	/* If the pin supports esync control expose its range but only
-	 * if the current reference frequency is > 1 Hz.
-	 */
-	if (pin->esync_control && zl3073x_ref_freq_get(ref) > 1) {
-		esync->range = esync_freq_ranges;
-		esync->range_num = ARRAY_SIZE(esync_freq_ranges);
-	} else {
-		esync->range = NULL;
-		esync->range_num = 0;
-	}
-
 	return 0;
 }
 
@@ -582,8 +577,8 @@ zl3073x_dpll_output_pin_esync_get(const struct dpll_pin *dpll_pin,
 	struct zl3073x_dpll_pin *pin = pin_priv;
 	const struct zl3073x_synth *synth;
 	const struct zl3073x_out *out;
+	u32 synth_freq, out_freq;
 	u8 clock_type, out_id;
-	u32 synth_freq;
 
 	out_id = zl3073x_output_pin_out_get(pin->id);
 	out = zl3073x_out_state_get(zldev, out_id);
@@ -592,17 +587,19 @@ zl3073x_dpll_output_pin_esync_get(const struct dpll_pin *dpll_pin,
 	 * for N-division is also used for the esync divider so both cannot
 	 * be used.
 	 */
-	switch (zl3073x_out_signal_format_get(out)) {
-	case ZL_OUTPUT_MODE_SIGNAL_FORMAT_2_NDIV:
-	case ZL_OUTPUT_MODE_SIGNAL_FORMAT_2_NDIV_INV:
+	if (zl3073x_out_is_ndiv(out))
 		return -EOPNOTSUPP;
-	default:
-		break;
-	}
 
 	/* Get attached synth frequency */
 	synth = zl3073x_synth_state_get(zldev, zl3073x_out_synth_get(out));
 	synth_freq = zl3073x_synth_freq_get(synth);
+	out_freq = synth_freq / out->div;
+
+	if (!pin->esync_control || out_freq <= 1)
+		return -EOPNOTSUPP;
+
+	esync->range = esync_freq_ranges;
+	esync->range_num = ARRAY_SIZE(esync_freq_ranges);
 
 	clock_type = FIELD_GET(ZL_OUTPUT_MODE_CLOCK_TYPE, out->mode);
 	if (clock_type != ZL_OUTPUT_MODE_CLOCK_TYPE_ESYNC) {
@@ -610,11 +607,11 @@ zl3073x_dpll_output_pin_esync_get(const struct dpll_pin *dpll_pin,
 		esync->freq = 0;
 		esync->pulse = 0;
 
-		goto finish;
+		return 0;
 	}
 
 	/* Compute esync frequency */
-	esync->freq = synth_freq / out->div / out->esync_n_period;
+	esync->freq = out_freq / out->esync_n_period;
 
 	/* By comparing the esync_pulse_width to the half of the pulse width
 	 * the esync pulse percentage can be determined.
@@ -623,18 +620,6 @@ zl3073x_dpll_output_pin_esync_get(const struct dpll_pin *dpll_pin,
 	 */
 	esync->pulse = (50 * out->esync_n_width) / out->div;
 
-finish:
-	/* Set supported esync ranges if the pin supports esync control and
-	 * if the output frequency is > 1 Hz.
-	 */
-	if (pin->esync_control && (synth_freq / out->div) > 1) {
-		esync->range = esync_freq_ranges;
-		esync->range_num = ARRAY_SIZE(esync_freq_ranges);
-	} else {
-		esync->range = NULL;
-		esync->range_num = 0;
-	}
-
 	return 0;
 }
 
@@ -660,13 +645,8 @@ zl3073x_dpll_output_pin_esync_set(const struct dpll_pin *dpll_pin,
 	 * for N-division is also used for the esync divider so both cannot
 	 * be used.
 	 */
-	switch (zl3073x_out_signal_format_get(&out)) {
-	case ZL_OUTPUT_MODE_SIGNAL_FORMAT_2_NDIV:
-	case ZL_OUTPUT_MODE_SIGNAL_FORMAT_2_NDIV_INV:
+	if (zl3073x_out_is_ndiv(&out))
 		return -EOPNOTSUPP;
-	default:
-		break;
-	}
 
 	/* Select clock type */
 	if (freq)
@@ -728,9 +708,9 @@ zl3073x_dpll_output_pin_frequency_set(const struct dpll_pin *dpll_pin,
 	struct zl3073x_dev *zldev = zldpll->dev;
 	struct zl3073x_dpll_pin *pin = pin_priv;
 	const struct zl3073x_synth *synth;
-	u8 out_id, signal_format;
 	u32 new_div, synth_freq;
 	struct zl3073x_out out;
+	u8 out_id;
 
 	out_id = zl3073x_output_pin_out_get(pin->id);
 	out = *zl3073x_out_state_get(zldev, out_id);
@@ -740,12 +720,8 @@ zl3073x_dpll_output_pin_frequency_set(const struct dpll_pin *dpll_pin,
 	synth_freq = zl3073x_synth_freq_get(synth);
 	new_div = synth_freq / (u32)frequency;
 
-	/* Get used signal format for the given output */
-	signal_format = zl3073x_out_signal_format_get(&out);
-
 	/* Check signal format */
-	if (signal_format != ZL_OUTPUT_MODE_SIGNAL_FORMAT_2_NDIV &&
-	    signal_format != ZL_OUTPUT_MODE_SIGNAL_FORMAT_2_NDIV_INV) {
+	if (!zl3073x_out_is_ndiv(&out)) {
 		/* For non N-divided signal formats the frequency is computed
 		 * as division of synth frequency and output divisor.
 		 */
-- 
2.52.0