linux-kernel - [PATCH] usb: typec: ptn36502: switch to DRM_AUX

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Message-Id: <20240315-ptn36502-aux-v1-1-c9d3c828ff2e@fairphone.com>
Date: Fri, 15 Mar 2024 17:04:22 +0100
From: Luca Weiss <luca.weiss@...rphone.com>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, 
 linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Luca Weiss <luca.weiss@...rphone.com>
Subject: [PATCH] usb: typec: ptn36502: switch to DRM_AUX_BRIDGE

Switch to using the new DRM_AUX_BRIDGE helper to create the transparent
DRM bridge device instead of handcoding corresponding functionality.

Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
Very similar to this patch:
c5d296bad640 ("usb: typec: nb7vpq904m: switch to DRM_AUX_BRIDGE")
---
 drivers/usb/typec/mux/Kconfig    |  2 +-
 drivers/usb/typec/mux/ptn36502.c | 44 ++--------------------------------------
 2 files changed, 3 insertions(+), 43 deletions(-)

diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig
index 399c7b0983df..4827e86fed6d 100644
--- a/drivers/usb/typec/mux/Kconfig
+++ b/drivers/usb/typec/mux/Kconfig
@@ -60,7 +60,7 @@ config TYPEC_MUX_PTN36502
 	tristate "NXP PTN36502 Type-C redriver driver"
 	depends on I2C
 	depends on DRM || DRM=n
-	select DRM_PANEL_BRIDGE if DRM
+	select DRM_AUX_BRIDGE if DRM_BRIDGE
 	select REGMAP_I2C
 	help
 	  Say Y or M if your system has a NXP PTN36502 Type-C redriver chip
diff --git a/drivers/usb/typec/mux/ptn36502.c b/drivers/usb/typec/mux/ptn36502.c
index 72ae38a1b2be..0ec86ef32a87 100644
--- a/drivers/usb/typec/mux/ptn36502.c
+++ b/drivers/usb/typec/mux/ptn36502.c
@@ -8,7 +8,7 @@
  * Copyright (C) 2023 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
  */
 
-#include <drm/drm_bridge.h>
+#include <drm/bridge/aux-bridge.h>
 #include <linux/bitfield.h>
 #include <linux/i2c.h>
 #include <linux/kernel.h>
@@ -68,8 +68,6 @@ struct ptn36502 {
 
 	struct typec_switch *typec_switch;
 
-	struct drm_bridge bridge;
-
 	struct mutex lock; /* protect non-concurrent retimer & switch */
 
 	enum typec_orientation orientation;
@@ -283,44 +281,6 @@ static int ptn36502_detect(struct ptn36502 *ptn)
 	return 0;
 }
 
-#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DRM_PANEL_BRIDGE)
-static int ptn36502_bridge_attach(struct drm_bridge *bridge,
-				  enum drm_bridge_attach_flags flags)
-{
-	struct ptn36502 *ptn = container_of(bridge, struct ptn36502, bridge);
-	struct drm_bridge *next_bridge;
-
-	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
-		return -EINVAL;
-
-	next_bridge = devm_drm_of_get_bridge(&ptn->client->dev, ptn->client->dev.of_node, 0, 0);
-	if (IS_ERR(next_bridge)) {
-		dev_err(&ptn->client->dev, "failed to acquire drm_bridge: %pe\n", next_bridge);
-		return PTR_ERR(next_bridge);
-	}
-
-	return drm_bridge_attach(bridge->encoder, next_bridge, bridge,
-				 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
-}
-
-static const struct drm_bridge_funcs ptn36502_bridge_funcs = {
-	.attach	= ptn36502_bridge_attach,
-};
-
-static int ptn36502_register_bridge(struct ptn36502 *ptn)
-{
-	ptn->bridge.funcs = &ptn36502_bridge_funcs;
-	ptn->bridge.of_node = ptn->client->dev.of_node;
-
-	return devm_drm_bridge_add(&ptn->client->dev, &ptn->bridge);
-}
-#else
-static int ptn36502_register_bridge(struct ptn36502 *ptn)
-{
-	return 0;
-}
-#endif
-
 static const struct regmap_config ptn36502_regmap = {
 	.max_register = 0x0d,
 	.reg_bits = 8,
@@ -369,7 +329,7 @@ static int ptn36502_probe(struct i2c_client *client)
 	if (ret)
 		goto err_disable_regulator;
 
-	ret = ptn36502_register_bridge(ptn);
+	ret = drm_aux_bridge_register(dev);
 	if (ret)
 		goto err_disable_regulator;
 

---
base-commit: 9bb9b28d0568991b1d63e66fe75afa5f97ad1156
change-id: 20240315-ptn36502-aux-15dd6f289aff

Best regards,
-- 
Luca Weiss <luca.weiss@...rphone.com>