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SubjectRe: [PATCH 05/18] phy: tegra: xusb: Add support to get companion USB 3 port
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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
>>

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