[PATCH] soc: qcom: smd: Implement id_table driver matching

[Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>]

Implement a id_table based driver maching mechanism for drivers that
binds to fixed channels and doesn't need any additional configuration,
e.g. IPCRTR and DIAG.

Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>
---
 drivers/soc/qcom/smd.c       | 25 ++++++++++++++++++-------
 include/linux/soc/qcom/smd.h | 11 +++++++++++
 2 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/drivers/soc/qcom/smd.c b/drivers/soc/qcom/smd.c
index cb7bc55d981a..ed1e4922b14d 100644
--- a/drivers/soc/qcom/smd.c
+++ b/drivers/soc/qcom/smd.c
@@ -725,6 +725,19 @@ static struct qcom_smd_driver *to_smd_driver(struct device *dev)
 
 static int qcom_smd_dev_match(struct device *dev, struct device_driver *drv)
 {
+	struct qcom_smd_device *qsdev = to_smd_device(dev);
+	struct qcom_smd_driver *qsdrv = container_of(drv, struct qcom_smd_driver, driver);
+	const struct qcom_smd_id *match = qsdrv->smd_match_table;
+	const char *name = qsdev->channel->name;
+
+	if (match) {
+		while (match->name[0]) {
+			if (!strcmp(match->name, name))
+				return 1;
+			match++;
+		}
+	}
+
 	return of_driver_match_device(dev, drv);
 }
 
@@ -878,19 +891,17 @@ static int qcom_smd_create_device(struct qcom_smd_channel *channel)
 	if (channel->qsdev)
 		return -EEXIST;
 
-	node = qcom_smd_match_channel(edge->of_node, channel->name);
-	if (!node) {
-		dev_dbg(smd->dev, "no match for '%s'\n", channel->name);
-		return -ENXIO;
-	}
-
 	dev_dbg(smd->dev, "registering '%s'\n", channel->name);
 
 	qsdev = kzalloc(sizeof(*qsdev), GFP_KERNEL);
 	if (!qsdev)
 		return -ENOMEM;
 
-	dev_set_name(&qsdev->dev, "%s.%s", edge->of_node->name, node->name);
+	node = qcom_smd_match_channel(edge->of_node, channel->name);
+	dev_set_name(&qsdev->dev, "%s.%s",
+		     edge->of_node->name,
+		     node ? node->name : channel->name);
+
 	qsdev->dev.parent = smd->dev;
 	qsdev->dev.bus = &qcom_smd_bus;
 	qsdev->dev.release = qcom_smd_release_device;
diff --git a/include/linux/soc/qcom/smd.h b/include/linux/soc/qcom/smd.h
index d7e50aa6a4ac..d0cb6d189a0a 100644
--- a/include/linux/soc/qcom/smd.h
+++ b/include/linux/soc/qcom/smd.h
@@ -9,6 +9,14 @@ struct qcom_smd_channel;
 struct qcom_smd_lookup;
 
 /**
+ * struct qcom_smd_id - struct used for matching a smd device
+ * @name:	name of the channel
+ */
+struct qcom_smd_id {
+	char name[20];
+};
+
+/**
  * struct qcom_smd_device - smd device struct
  * @dev:	the device struct
  * @channel:	handle to the smd channel for this device
@@ -21,6 +29,7 @@ struct qcom_smd_device {
 /**
  * struct qcom_smd_driver - smd driver struct
  * @driver:	underlying device driver
+ * @smd_match_table: static channel match table
  * @probe:	invoked when the smd channel is found
  * @remove:	invoked when the smd channel is closed
  * @callback:	invoked when an inbound message is received on the channel,
@@ -29,6 +38,8 @@ struct qcom_smd_device {
  */
 struct qcom_smd_driver {
 	struct device_driver driver;
+	const struct qcom_smd_id *smd_match_table;
+
 	int (*probe)(struct qcom_smd_device *dev);
 	void (*remove)(struct qcom_smd_device *dev);
 	int (*callback)(struct qcom_smd_device *, const void *, size_t);
-- 
1.8.2.2

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