[PATCH 08/10] soc: fsl: cpm1: qmc: Introduce qmc_chan_count_phandles()

[Herve Codina <herve.codina@bootlin.com>]

No function in the QMC API is available to get the number of phandles
present in a phandle list.

Fill this lack introducing qmc_chan_count_phandles().

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
 drivers/soc/fsl/qe/qmc.c | 13 +++++++++++++
 include/soc/fsl/qe/qmc.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c
index e23d60018400..76bb496305a0 100644
--- a/drivers/soc/fsl/qe/qmc.c
+++ b/drivers/soc/fsl/qe/qmc.c
@@ -1777,6 +1777,19 @@ static struct qmc_chan *qmc_chan_get_from_qmc(struct device_node *qmc_np, unsign
 	return qmc_chan;
 }
 
+int qmc_chan_count_phandles(struct device_node *np, const char *phandles_name)
+{
+	int count;
+
+	/* phandles are fixed args phandles with one arg */
+	count = of_count_phandle_with_args(np, phandles_name, NULL);
+	if (count < 0)
+		return count;
+
+	return count / 2;
+}
+EXPORT_SYMBOL(qmc_chan_count_phandles);
+
 struct qmc_chan *qmc_chan_get_byphandles_index(struct device_node *np,
 					       const char *phandles_name,
 					       int index)
diff --git a/include/soc/fsl/qe/qmc.h b/include/soc/fsl/qe/qmc.h
index 0fa7205145ce..294e42ea8d4c 100644
--- a/include/soc/fsl/qe/qmc.h
+++ b/include/soc/fsl/qe/qmc.h
@@ -16,6 +16,8 @@ struct device_node;
 struct device;
 struct qmc_chan;
 
+int qmc_chan_count_phandles(struct device_node *np, const char *phandles_name);
+
 struct qmc_chan *qmc_chan_get_byphandles_index(struct device_node *np,
 					       const char *phandles_name,
 					       int index);
-- 
2.45.0