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usb: typec: fusb302: add DRM DP HPD bridge support

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Add support to use fusb302 based USB-C connectors with the DP altmode
helper code on devicetree based platforms. To get this working there
must be a DRM bridge chain from the DisplayPort controller to the USB-C
connector. E.g. on Rockchip RK3576:

root@rk3576 # cat /sys/kernel/debug/dri/0/encoder-0/bridges
bridge[0]: dw_dp_bridge_funcs
	refcount: 7
	type: [10] DP
	OF: /soc/dp@27e40000:rockchip,rk3576-dp
	ops: [0x47] detect edid hpd
bridge[1]: drm_aux_bridge_funcs
	refcount: 4
	type: [0] Unknown
	OF: /soc/phy@2b010000:rockchip,rk3576-usbdp-phy
	ops: [0x0]
bridge[2]: drm_aux_hpd_bridge_funcs
	refcount: 5
	type: [10] DP
	OF: /soc/i2c@2ac50000/typec-portc@22/connector:usb-c-connector
	ops: [0x4] hpd

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20260310-fusb302-drm-dp-hpd-bridge-v1-1-ffd41ef9afe3@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sebastian Reichel 2026-03-10 18:17:34 +01:00 committed by Greg Kroah-Hartman
parent afcba2ced1
commit 5d79c52540
2 changed files with 15 additions and 0 deletions
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2
drivers/usb/typec/tcpm/Kconfig
View File

@ -58,6 +58,8 @@ config TYPEC_FUSB302
tristate "Fairchild FUSB302 Type-C chip driver"
depends on I2C
depends on EXTCON || !EXTCON
depends on DRM || DRM=n
select DRM_AUX_HPD_BRIDGE if DRM_BRIDGE && OF
help
The Fairchild FUSB302 Type-C chip driver that works with
Type-C Port Controller Manager to provide USB PD and USB

13
drivers/usb/typec/tcpm/fusb302.c
View File

@ -5,6 +5,7 @@
* Fairchild FUSB302 Type-C Chip Driver
*/
#include <drm/bridge/aux-bridge.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/errno.h>
@ -1689,6 +1690,7 @@ static int fusb302_probe(struct i2c_client *client)
{
struct fusb302_chip *chip;
struct i2c_adapter *adapter = client->adapter;
struct auxiliary_device *bridge_dev;
struct device *dev = &client->dev;
const char *name;
int ret = 0;
@ -1747,6 +1749,13 @@ static int fusb302_probe(struct i2c_client *client)
goto destroy_workqueue;
}
bridge_dev = devm_drm_dp_hpd_bridge_alloc(chip->dev, to_of_node(chip->tcpc_dev.fwnode));
if (IS_ERR(bridge_dev)) {
ret = PTR_ERR(bridge_dev);
dev_err_probe(chip->dev, ret, "failed to alloc bridge\n");
goto destroy_workqueue;
}
chip->tcpm_port = tcpm_register_port(&client->dev, &chip->tcpc_dev);
if (IS_ERR(chip->tcpm_port)) {
fwnode_handle_put(chip->tcpc_dev.fwnode);
@ -1764,6 +1773,10 @@ static int fusb302_probe(struct i2c_client *client)
enable_irq_wake(chip->gpio_int_n_irq);
i2c_set_clientdata(client, chip);
ret = devm_drm_dp_hpd_bridge_add(chip->dev, bridge_dev);
if (ret)
return ret;
return ret;
tcpm_unregister_port: