linux-kernel - [RESEND v4 1/4] usb: typec: Stub out typec_switch APIs when CONFIG

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Message-Id: <20250908053335.36685-1-xu.yang_2@nxp.com>
Date: Mon,  8 Sep 2025 13:33:32 +0800
From: Xu Yang <xu.yang_2@....com>
To: krzk@...nel.org,
	myungjoo.ham@...sung.com,
	cw00.choi@...sung.com,
	robh@...nel.org,
	conor+dt@...nel.org,
	gregkh@...uxfoundation.org
Cc: swboyd@...omium.org,
	heikki.krogerus@...ux.intel.com,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev,
	jun.li@....com
Subject: [RESEND v4 1/4] usb: typec: Stub out typec_switch APIs when CONFIG_TYPEC=n

From: Stephen Boyd <swboyd@...omium.org>

Ease driver development by adding stubs for the typec_switch APIs when
CONFIG_TYPEC=n. Copy the same method used for the typec_mux APIs to be
consistent.

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
Signed-off-by: Xu Yang <xu.yang_2@....com>

---
Changes in v4:
 - no changes
Changes in v3:
 - add my Signed-off-by
 - add Acked-by tag
Changes in v2:
 - pick up this patch to fix build error in v1
 - refer to https://lore.kernel.org/linux-usb/Ztb1sI2W7t5k2yT7@kuha.fi.intel.com/
---
 include/linux/usb/typec_mux.h | 43 +++++++++++++++++++++++++++++++----
 1 file changed, 38 insertions(+), 5 deletions(-)

diff --git a/include/linux/usb/typec_mux.h b/include/linux/usb/typec_mux.h
index 2489a7857d8e..efb5ed32b813 100644
--- a/include/linux/usb/typec_mux.h
+++ b/include/linux/usb/typec_mux.h
@@ -3,6 +3,7 @@
 #ifndef __USB_TYPEC_MUX
 #define __USB_TYPEC_MUX
 
+#include <linux/err.h>
 #include <linux/property.h>
 #include <linux/usb/typec.h>
 
@@ -24,16 +25,13 @@ struct typec_switch_desc {
 	void *drvdata;
 };
 
+#if IS_ENABLED(CONFIG_TYPEC)
+
 struct typec_switch *fwnode_typec_switch_get(struct fwnode_handle *fwnode);
 void typec_switch_put(struct typec_switch *sw);
 int typec_switch_set(struct typec_switch *sw,
 		     enum typec_orientation orientation);
 
-static inline struct typec_switch *typec_switch_get(struct device *dev)
-{
-	return fwnode_typec_switch_get(dev_fwnode(dev));
-}
-
 struct typec_switch_dev *
 typec_switch_register(struct device *parent,
 		      const struct typec_switch_desc *desc);
@@ -42,6 +40,41 @@ void typec_switch_unregister(struct typec_switch_dev *sw);
 void typec_switch_set_drvdata(struct typec_switch_dev *sw, void *data);
 void *typec_switch_get_drvdata(struct typec_switch_dev *sw);
 
+#else
+
+static inline struct typec_switch *
+fwnode_typec_switch_get(struct fwnode_handle *fwnode)
+{
+	return NULL;
+}
+static inline void typec_switch_put(struct typec_switch *sw) {}
+static inline int typec_switch_set(struct typec_switch *sw,
+		     enum typec_orientation orientation)
+{
+	return 0;
+}
+
+static inline struct typec_switch_dev *
+typec_switch_register(struct device *parent,
+		      const struct typec_switch_desc *desc)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+static inline void typec_switch_unregister(struct typec_switch_dev *sw) {}
+
+static inline void typec_switch_set_drvdata(struct typec_switch_dev *sw, void *data) {}
+static inline void *typec_switch_get_drvdata(struct typec_switch_dev *sw)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
+#endif /* CONFIG_TYPEC */
+
+static inline struct typec_switch *typec_switch_get(struct device *dev)
+{
+	return fwnode_typec_switch_get(dev_fwnode(dev));
+}
+
 struct typec_mux_state {
 	struct typec_altmode *alt;
 	unsigned long mode;
-- 
2.34.1