media: qcom: camss: Allow clocks vfeN vfe_liteN or vfe_lite

The number of Video Front End - VFE or Image Front End - IFE supported
with new SoCs can vary both for the full and lite cases.

For example sdm845 has one vfe_lite and two vfe interfaces with the vfe
clock called simply "vfe_lite" with no integer postfix. sc8280xp has four
vfe and four vfe lite blocks.

At the moment we declare vfe_lite0 and vfe_lite1 for sm8250 but never set
those clocks because we don't match the strings.

We need to support the following clock name formats

- vfeN
- vfe_liteN
- vfe_lite

with N being any reasonably sized integer.

There are two sites in this code which need to do the same thing,
constructing and matching strings with the pattern above, so encapsulate
the logic in one function.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/platform/qcom/camss/camss-vfe.c

@@ -431,6 +431,20 @@ void vfe_isr_reset_ack(struct vfe_device *vfe)
 	complete(&vfe->reset_complete);
 }
 
+static int vfe_match_clock_names(struct vfe_device *vfe,
+				 struct camss_clock *clock)
+{
+	char vfe_name[7]; /* vfeXXX\0 */
+	char vfe_lite_name[12]; /* vfe_liteXXX\0 */
+
+	snprintf(vfe_name, sizeof(vfe_name), "vfe%d", vfe->id);
+	snprintf(vfe_lite_name, sizeof(vfe_lite_name), "vfe_lite%d", vfe->id);
+
+	return (!strcmp(clock->name, vfe_name) ||
+		!strcmp(clock->name, vfe_lite_name) ||
+		!strcmp(clock->name, "vfe_lite"));
+}
+
 /*
  * vfe_set_clock_rates - Calculate and set clock rates on VFE module
  * @vfe: VFE device
@@ -454,9 +468,7 @@ static int vfe_set_clock_rates(struct vfe_device *vfe)
 	for (i = 0; i < vfe->nclocks; i++) {
 		struct camss_clock *clock = &vfe->clock[i];
 
-		if (!strcmp(clock->name, "vfe0") ||
-		    !strcmp(clock->name, "vfe1") ||
-		    !strcmp(clock->name, "vfe_lite")) {
+		if (vfe_match_clock_names(vfe, clock)) {
 			u64 min_rate = 0;
 			long rate;
 
@@ -537,9 +549,7 @@ static int vfe_check_clock_rates(struct vfe_device *vfe)
 	for (i = 0; i < vfe->nclocks; i++) {
 		struct camss_clock *clock = &vfe->clock[i];
 
-		if (!strcmp(clock->name, "vfe0") ||
-		    !strcmp(clock->name, "vfe1") ||
-		    !strcmp(clock->name, "vfe_lite")) {
+		if (vfe_match_clock_names(vfe, clock)) {
 			u64 min_rate = 0;
 			unsigned long rate;