linux-kernel - [PATCH v5 4/8] phy: rockchip: phy-rockchip-typec: Add DRM AUX bridge

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Message-Id: <20251011033233.97-5-kernel@airkyi.com>
Date: Sat, 11 Oct 2025 11:32:29 +0800
From: Chaoyi Chen <kernel@...kyi.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Sandy Huang <hjc@...k-chips.com>,
	Andy Yan <andy.yan@...k-chips.com>,
	Yubing Zhang <yubing.zhang@...k-chips.com>,
	Frank Wang <frank.wang@...k-chips.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Amit Sunil Dhamne <amitsd@...gle.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Chaoyi Chen <chaoyi.chen@...k-chips.com>,
	Dragan Simic <dsimic@...jaro.org>,
	Johan Jonker <jbx6244@...il.com>,
	Diederik de Haas <didi.debian@...ow.org>,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	Peter Robinson <pbrobinson@...il.com>
Cc: linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-phy@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH v5 4/8] phy: rockchip: phy-rockchip-typec: Add DRM AUX bridge

From: Chaoyi Chen <chaoyi.chen@...k-chips.com>

Using the DRM_AUX_BRIDGE helper to create the transparent DRM bridge
device.

Signed-off-by: Chaoyi Chen <chaoyi.chen@...k-chips.com>
---
 drivers/phy/rockchip/phy-rockchip-typec.c | 52 +++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/phy/rockchip/phy-rockchip-typec.c b/drivers/phy/rockchip/phy-rockchip-typec.c
index 4a1dfa8d65c7..8003a41de5c6 100644
--- a/drivers/phy/rockchip/phy-rockchip-typec.c
+++ b/drivers/phy/rockchip/phy-rockchip-typec.c
@@ -36,6 +36,7 @@
  * orientation, false is normal orientation.
  */
 
+#include <linux/auxiliary_bus.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/delay.h>
@@ -56,6 +57,7 @@
 #include <linux/phy/phy.h>
 #include <linux/usb/typec_dp.h>
 #include <linux/usb/typec_mux.h>
+#include <drm/bridge/aux-bridge.h>
 
 #define CMN_SSM_BANDGAP			(0x21 << 2)
 #define CMN_SSM_BIAS			(0x22 << 2)
@@ -415,6 +417,7 @@ struct rockchip_usb3phy_port_cfg {
 
 struct rockchip_typec_phy {
 	struct device *dev;
+	struct auxiliary_device dp_port_dev;
 	void __iomem *base;
 	struct extcon_dev *extcon;
 	struct typec_mux_dev *mux;
@@ -1296,6 +1299,51 @@ static void tcphy_typec_mux_unregister(void *data)
 	typec_mux_unregister(tcphy->mux);
 }
 
+static void tcphy_dp_port_dev_release(struct device *dev)
+{
+	struct auxiliary_device *adev = to_auxiliary_dev(dev);
+
+	of_node_put(adev->dev.of_node);
+}
+
+static void tcphy_dp_port_unregister_adev(void *_adev)
+{
+	struct auxiliary_device *adev = _adev;
+
+	auxiliary_device_delete(adev);
+	auxiliary_device_uninit(adev);
+}
+
+static int tcphy_aux_bridge_register(struct rockchip_typec_phy *tcphy, struct device_node *np)
+{
+	struct auxiliary_device *adev = &tcphy->dp_port_dev;
+	int ret;
+
+	adev->name = "dp_port";
+	adev->dev.parent = tcphy->dev;
+	adev->dev.of_node = of_node_get(np);
+	adev->dev.release = tcphy_dp_port_dev_release;
+
+	ret = auxiliary_device_init(adev);
+
+	if (ret) {
+		of_node_put(adev->dev.of_node);
+		return ret;
+	}
+
+	ret = auxiliary_device_add(adev);
+	if (ret) {
+		auxiliary_device_uninit(adev);
+		return ret;
+	}
+
+	devm_add_action_or_reset(tcphy->dev, tcphy_dp_port_unregister_adev, adev);
+
+	ret = drm_aux_bridge_register(&adev->dev);
+
+	return 0;
+}
+
 static int tcphy_setup_typec_mux(struct rockchip_typec_phy *tcphy)
 {
 	struct typec_mux_desc mux_desc = {};
@@ -1309,6 +1357,10 @@ static int tcphy_setup_typec_mux(struct rockchip_typec_phy *tcphy)
 	if (!of_property_read_bool(np, "mode-switch"))
 		goto put_np;
 
+	ret = tcphy_aux_bridge_register(tcphy, np);
+	if (ret)
+		goto put_np;
+
 	mux_desc.drvdata = tcphy;
 	mux_desc.fwnode = device_get_named_child_node(tcphy->dev, "dp-port");
 	mux_desc.set = tcphy_typec_mux_set;
-- 
2.49.0