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

Chaoyi Chen
2025-10-11T03:33:45Z

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

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

Signed-off-by: Chaoyi Chen <chaoyi.chen@rock-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