[PATCH v5 11/12] soc: mediatek: cmdq: add cmdq_dev_get_event function

[Bibby Hsieh <bibby.hsieh@xxxxxxxxxxxx>]

When client ask gce to clear or wait for event,
client need to pass event number to the API.
We suggest client store the event information in device node,
so we provide an API for client parse the event property.

Signed-off-by: Bibby Hsieh <bibby.hsieh@xxxxxxxxxxxx>
---
 drivers/soc/mediatek/mtk-cmdq-helper.c | 28 ++++++++++++++++++++++++++
 include/linux/soc/mediatek/mtk-cmdq.h  | 12 +++++++++++
 2 files changed, 40 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index 00636ec995e8..b44bce1f9159 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -52,6 +52,34 @@ struct cmdq_subsys *cmdq_dev_get_subsys(struct device *dev, int idx)
 }
 EXPORT_SYMBOL(cmdq_dev_get_subsys);
 
+s32 cmdq_dev_get_event(struct device *dev, const char *name)
+{
+	s32 index = 0;
+	s32 result;
+
+	if (!dev)
+		return -EINVAL;
+
+	index = of_property_match_string(dev->of_node,
+					 "mediatek,gce-event-names", name);
+	if (index < 0) {
+		dev_err(dev, "no gce-event-names property or no such event:%s",
+			name);
+
+		return index;
+	}
+
+	if (of_property_read_u32_index(dev->of_node, "mediatek,gce-events",
+				       index, &result)) {
+		dev_err(dev, "can't parse gce-events property");
+
+		return -ENODEV;
+	}
+
+	return result;
+}
+EXPORT_SYMBOL(cmdq_dev_get_event);
+
 static void cmdq_client_timeout(struct timer_list *t)
 {
 	struct cmdq_client *client = from_timer(client, t, timer);
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index 574006c5cd76..15884354af20 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -160,4 +160,16 @@ int cmdq_pkt_flush(struct cmdq_pkt *pkt);
  */
 struct cmdq_subsys *cmdq_dev_get_subsys(struct device *dev, int idx);
 
+/**
+ * cmdq_dev_get_event() - parse event from the device node of CMDQ client
+ * @dev:	device of CMDQ mailbox client
+ * @name:	the name of desired event
+ *
+ * Return: CMDQ event number
+ *
+ * Help CMDQ client pasing the event number
+ * from the device node of CMDQ client.
+ */
+s32 cmdq_dev_get_event(struct device *dev, const char *name);
+
 #endif	/* __MTK_CMDQ_H__ */
-- 
2.18.0