[Patch V2 03/18] phy: tegra: xusb: Add usb-role-switch support

Nagarjuna Kristam
2019-12-18T09:17:05Z

If usb-role-switch property is present in USB 2 port, register
usb-role-switch to receive usb role changes.

Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
---
V2:
- Removed dev_set_drvdata for port->dev.
- Added of_platform_depopulate during error handling and driver removal.
---
drivers/phy/tegra/Kconfig | 1 +
drivers/phy/tegra/xusb.c | 42 ++++++++++++++++++++++++++++++++++++++++++
drivers/phy/tegra/xusb.h | 3 +++
3 files changed, 46 insertions(+)

diff --git a/drivers/phy/tegra/Kconfig b/drivers/phy/tegra/Kconfig
index f9817c3..df07c4d 100644
--- a/drivers/phy/tegra/Kconfig
+++ b/drivers/phy/tegra/Kconfig
@@ -2,6 +2,7 @@
config PHY_TEGRA_XUSB
tristate "NVIDIA Tegra XUSB pad controller driver"
depends on ARCH_TEGRA
+ select USB_CONN_GPIO
help
Choose this option if you have an NVIDIA Tegra SoC.

diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index f98ec39..dc00b42 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -523,6 +523,7 @@ static int tegra_xusb_port_init(struct tegra_xusb_port *port,
port->dev.type = &tegra_xusb_port_type;
port->dev.of_node = of_node_get(np);
port->dev.parent = padctl->dev;
+ port->dev.driver = padctl->dev->driver;

err = dev_set_name(&port->dev, "%s-%u", name, index);
if (err < 0)
@@ -541,6 +542,10 @@ static int tegra_xusb_port_init(struct tegra_xusb_port *port,

static void tegra_xusb_port_unregister(struct tegra_xusb_port *port)
{
+ if (!IS_ERR_OR_NULL(port->usb_role_sw)) {
+ of_platform_depopulate(&port->dev);
+ usb_role_switch_unregister(port->usb_role_sw);
+ }
device_unregister(&port->dev);
}

@@ -551,11 +556,42 @@ static const char *const modes[] = {
[USB_DR_MODE_OTG] = "otg",
};

+static int tegra_xusb_role_sw_set(struct device *dev, enum usb_role role)
+{
+ dev_dbg(dev, "%s calling notifier for role is %d\n", __func__, role);
+
+ return 0;
+}
+
+static int tegra_xusb_setup_usb_role_switch(struct tegra_xusb_port *port)
+{
+ int err = 0;
+ struct usb_role_switch_desc role_sx_desc = {
+ .set = tegra_xusb_role_sw_set,
+ .fwnode = dev_fwnode(&port->dev),
+ };
+
+ port->usb_role_sw = usb_role_switch_register(&port->dev,
+ &role_sx_desc);
+ if (IS_ERR(port->usb_role_sw)) {
+ err = PTR_ERR(port->usb_role_sw);
+ if (err != EPROBE_DEFER)
+ dev_err(&port->dev, "Failed to register USB role SW: %d",
+ err);
+ }
+
+ /* populate connector entry */
+ of_platform_populate(port->dev.of_node, NULL, NULL, &port->dev);
+
+ return err;
+}
+
static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
{
struct tegra_xusb_port *port = &usb2->base;
struct device_node *np = port->dev.of_node;
const char *mode;
+ int err;

usb2->internal = of_property_read_bool(np, "nvidia,internal");

@@ -572,6 +608,12 @@ static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
usb2->mode = USB_DR_MODE_HOST;
}

+ if (of_property_read_bool(np, "usb-role-switch")) {
+ err = tegra_xusb_setup_usb_role_switch(port);
+ if (err < 0)
+ return err;
+ }
+
usb2->supply = devm_regulator_get(&port->dev, "vbus");
return PTR_ERR_OR_ZERO(usb2->supply);
}
diff --git a/drivers/phy/tegra/xusb.h b/drivers/phy/tegra/xusb.h
index da94fcc..9f27899 100644
--- a/drivers/phy/tegra/xusb.h
+++ b/drivers/phy/tegra/xusb.h
@@ -12,6 +12,7 @@
#include <linux/workqueue.h>

#include <linux/usb/otg.h>
+#include <linux/usb/role.h>

/* legacy entry points for backwards-compatibility */
int tegra_xusb_padctl_legacy_probe(struct platform_device *pdev);
@@ -266,6 +267,8 @@ struct tegra_xusb_port {
struct list_head list;
struct device dev;

+ struct usb_role_switch *usb_role_sw;
+
const struct tegra_xusb_port_ops *ops;
};

--
2.7.4