Merge tag 'devfreq-next-for-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux

Pull devfreq updates for v5.16 from Chanwoo Choi:

"1. Minor update for exynos-ppmu devfreq-event driver

  - Devicetree naming convention requires the device node names
    to use hyphens instead of underlines. In order to support
    this requirement, changes the code with hyphens.

  - Simplify parsing event-type from devicetree without behavior
    changes.

 2. Strengthen check for freq_table in devfreq core

  - Check whether both freq_table is not NULL and size of freq_table
    is not zero in order to prevent the error by mistake of devfreq
    driver developer.

* tag 'devfreq-next-for-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux:
  PM / devfreq: Strengthen check for freq_table
  devfreq: exynos-ppmu: simplify parsing event-type from DT
  devfreq: exynos-ppmu: use node names with hyphens

drivers/devfreq/devfreq.c

@@ -827,7 +827,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
 		goto err_dev;
 	}
 
-	if (!devfreq->profile->max_state && !devfreq->profile->freq_table) {
+	if (!devfreq->profile->max_state || !devfreq->profile->freq_table) {
 		mutex_unlock(&devfreq->lock);
 		err = set_freq_table(devfreq);
 		if (err < 0)

drivers/devfreq/event/exynos-ppmu.c

@@ -94,11 +94,16 @@ static struct __exynos_ppmu_events {
 	PPMU_EVENT(d1-general),
 	PPMU_EVENT(d1-rt),
 
-	/* For Exynos5422 SoC */
+	/* For Exynos5422 SoC, deprecated (backwards compatible) */
 	PPMU_EVENT(dmc0_0),
 	PPMU_EVENT(dmc0_1),
 	PPMU_EVENT(dmc1_0),
 	PPMU_EVENT(dmc1_1),
+	/* For Exynos5422 SoC */
+	PPMU_EVENT(dmc0-0),
+	PPMU_EVENT(dmc0-1),
+	PPMU_EVENT(dmc1-0),
+	PPMU_EVENT(dmc1-1),
 };
 
 static int __exynos_ppmu_find_ppmu_id(const char *edev_name)
@@ -561,13 +566,10 @@ static int of_get_devfreq_events(struct device_node *np,
 			 * use default if not.
 			 */
 			if (info->ppmu_type == EXYNOS_TYPE_PPMU_V2) {
-				int id;
 				/* Not all registers take the same value for
 				 * read+write data count.
 				 */
-				id = __exynos_ppmu_find_ppmu_id(desc[j].name);
-
-				switch (id) {
+				switch (ppmu_events[i].id) {
 				case PPMU_PMNCNT0:
 				case PPMU_PMNCNT1:
 				case PPMU_PMNCNT2: