Merge tag 'extcon-next-for-6.14' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon into char-misc-next

Pull extcon updates from Chanwoo:

Update extcon next for v6.14

Detailed description for this pull request:
- Fix null pointer check of memory allocation on extcon-rtk-type-c.c.
- Add EXTCON subsystem documentation including the detailed description/example.
- Drop unneeded init of struct i2c_device_id:driver_data on extcon-fsa9480/pth5150.c.

* tag 'extcon-next-for-6.14' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon:
  extcon: Drop explicit initialization of struct i2c_device_id::driver_data to 0
  Documentation: extcon: add documentation for Extcon subsystem
  extcon: realtek: fix NULL deref check in extcon_rtk_type_c_probe

3 files changed, 4 insertions, 2 deletions

diff --git a/drivers/extcon/extcon-fsa9480.c b/drivers/extcon/extcon-fsa9480.c
index e458ce0c45ab..b11b43171063 100644
--- a/drivers/extcon/extcon-fsa9480.c
+++ b/drivers/extcon/extcon-fsa9480.c
@@ -350,7 +350,7 @@ static const struct dev_pm_ops fsa9480_pm_ops = {
 };
 
 static const struct i2c_device_id fsa9480_id[] = {
-	{ "fsa9480", 0 },
+	{ "fsa9480" },
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, fsa9480_id);
diff --git a/drivers/extcon/extcon-ptn5150.c b/drivers/extcon/extcon-ptn5150.c
index 4616da7e5430..78ad86c4a3be 100644
--- a/drivers/extcon/extcon-ptn5150.c
+++ b/drivers/extcon/extcon-ptn5150.c
@@ -338,7 +338,7 @@ static const struct of_device_id ptn5150_dt_match[] = {
 MODULE_DEVICE_TABLE(of, ptn5150_dt_match);
 
 static const struct i2c_device_id ptn5150_i2c_id[] = {
-	{ "ptn5150", 0 },
+	{ "ptn5150" },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, ptn5150_i2c_id);
diff --git a/drivers/extcon/extcon-rtk-type-c.c b/drivers/extcon/extcon-rtk-type-c.c
index bdc2b7b3a246..82b60b927e41 100644
--- a/drivers/extcon/extcon-rtk-type-c.c
+++ b/drivers/extcon/extcon-rtk-type-c.c
@@ -1369,6 +1369,8 @@ static int extcon_rtk_type_c_probe(struct platform_device *pdev)
 	}
 
 	type_c->type_c_cfg = devm_kzalloc(dev, sizeof(*type_c_cfg), GFP_KERNEL);
+	if (!type_c->type_c_cfg)
+		return -ENOMEM;
 
 	memcpy(type_c->type_c_cfg, type_c_cfg, sizeof(*type_c_cfg));