[Patch V5 05/21] phy: tegra: xusb: Add support to get companion USB 3 port

Nagarjuna Kristam
2020-02-10T08:14:07Z

Tegra XUSB host, device mode driver requires the USB 3 companion port
number for corresponding USB 2 port. Add API to retrieve the same.

Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
Reviewed-by: JC Kuo <jckuo@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
---
V5:
- No changes.
---
V4:
- Addressed comment from Thierry.
- Added Acked-by info.
---
V3:
- Added Reviewed-by updates to commit message.
---
V2:
- Added -ENODEV as return instead of -1, to sync other errors.
---
drivers/phy/tegra/xusb.c | 21 +++++++++++++++++++++
include/linux/phy/tegra/xusb.h | 2 ++
2 files changed, 23 insertions(+)

diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index 2c0e29c..a8f0a0b 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -1294,6 +1294,27 @@ int tegra_phy_xusb_utmi_port_reset(struct phy *phy)
}
EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_port_reset);

+int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl,
+ unsigned int port)
+{
+ struct tegra_xusb_usb2_port *usb2;
+ struct tegra_xusb_usb3_port *usb3;
+ int i;
+
+ usb2 = tegra_xusb_find_usb2_port(padctl, port);
+ if (!usb2)
+ return -EINVAL;
+
+ for (i = 0; i < padctl->soc->ports.usb3.count; i++) {
+ usb3 = tegra_xusb_find_usb3_port(padctl, i);
+ if (usb3 && usb3->port == usb2->base.index)
+ return usb3->base.index;
+ }
+
+ return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get_usb3_companion);
+
MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver");
MODULE_LICENSE("GPL v2");
diff --git a/include/linux/phy/tegra/xusb.h b/include/linux/phy/tegra/xusb.h
index 1235865..71d9569 100644
--- a/include/linux/phy/tegra/xusb.h
+++ b/include/linux/phy/tegra/xusb.h
@@ -21,4 +21,6 @@ int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,
int tegra_xusb_padctl_set_vbus_override(struct tegra_xusb_padctl *padctl,
bool val);
int tegra_phy_xusb_utmi_port_reset(struct phy *phy);
+int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl,
+ unsigned int port);
#endif /* PHY_TEGRA_XUSB_H */
--
2.7.4