| Message ID | 1575629421-7039-6-git-send-email-nkristam@nvidia.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Tegra XUSB OTG support | expand |
On Fri, Dec 06, 2019 at 04:20:08PM +0530, Nagarjuna Kristam wrote: > 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> > --- > 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 4c86c99..2e73cf8 100644 > --- a/drivers/phy/tegra/xusb.c > +++ b/drivers/phy/tegra/xusb.c > @@ -1254,6 +1254,27 @@ 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 = tegra_xusb_find_usb2_port(padctl, > + port); > + struct tegra_xusb_usb3_port *usb3; > + int i; > + > + 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 -1; Since you return -EINVAL above, callers will have to interpret negative return values as standard errors, which would make this EPERM. That does not really make sense. Perhaps something like -ENODEV would be more appropriate in this case? Thierry > +} > +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 >
On 06-12-2019 20:27, Thierry Reding wrote: > On Fri, Dec 06, 2019 at 04:20:08PM +0530, Nagarjuna Kristam wrote: >> 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> >> --- >> 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 4c86c99..2e73cf8 100644 >> --- a/drivers/phy/tegra/xusb.c >> +++ b/drivers/phy/tegra/xusb.c >> @@ -1254,6 +1254,27 @@ 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 = tegra_xusb_find_usb2_port(padctl, >> + port); >> + struct tegra_xusb_usb3_port *usb3; >> + int i; >> + >> + 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 -1; > Since you return -EINVAL above, callers will have to interpret negative > return values as standard errors, which would make this EPERM. That does > not really make sense. Perhaps something like -ENODEV would be more > appropriate in this case? > > Thierry > Yes, making -ENODEV instead of -1 makes it inline with generic error codes. Will update accordingly. -Nagarjuna >> +} >> +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 >>
diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c index 4c86c99..2e73cf8 100644 --- a/drivers/phy/tegra/xusb.c +++ b/drivers/phy/tegra/xusb.c @@ -1254,6 +1254,27 @@ 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 = tegra_xusb_find_usb2_port(padctl, + port); + struct tegra_xusb_usb3_port *usb3; + int i; + + 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 -1; +} +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 */
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> --- drivers/phy/tegra/xusb.c | 21 +++++++++++++++++++++ include/linux/phy/tegra/xusb.h | 2 ++ 2 files changed, 23 insertions(+)