linux-kernel - Re: [Patch V3 05/18] phy: tegra: xusb: Add support to get companion USB 3 port

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Date:   Tue, 28 Jan 2020 18:40:51 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Nagarjuna Kristam <nkristam@...dia.com>
Cc:     balbi@...nel.org, gregkh@...uxfoundation.org, jonathanh@...dia.com,
        mark.rutland@....com, robh+dt@...nel.org, kishon@...com,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Patch V3 05/18] phy: tegra: xusb: Add support to get companion
 USB 3 port

On Mon, Dec 30, 2019 at 04:39:42PM +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@...dia.com>
> Reviewed-by: JC Kuo <jckuo@...dia.com>
> ---
> 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 536b2fc..80dbc57 100644
> --- a/drivers/phy/tegra/xusb.c
> +++ b/drivers/phy/tegra/xusb.c
> @@ -1274,6 +1274,27 @@ 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);

Nit: may be better to move the initialization of the variable to below,
right before the line that checks the validity of the pointer.

Other than that, looks good:

Acked-by: Thierry Reding <treding@...dia.com>

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