linux-kernel - Re: [PATCH v2 1/2] phy: tegra: xusb: Add API to retrieve the port number of phy

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Date: Thu, 7 Mar 2024 13:43:00 +0000
From: Jon Hunter <jonathanh@...dia.com>
To: Wayne Chang <waynec@...dia.com>, thierry.reding@...il.com,
 jckuo@...dia.com, vkoul@...nel.org, kishon@...nel.org,
 gregkh@...uxfoundation.org
Cc: linux-phy@...ts.infradead.org, linux-tegra@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
 stable@...r.kernel.org
Subject: Re: [PATCH v2 1/2] phy: tegra: xusb: Add API to retrieve the port
 number of phy


On 07/03/2024 03:03, Wayne Chang wrote:
> This patch introduces a new API, tegra_xusb_padctl_get_port_number,
> to the Tegra XUSB Pad Controller driver. This API is used to identify
> the USB port that is associated with a given PHY.
> 
> The function takes a PHY pointer for either a USB2 PHY or USB3 PHY as input
> and returns the corresponding port number. If the PHY pointer is invalid,
> it returns -ENODEV.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Wayne Chang <waynec@...dia.com>
> ---
> V1 -> V2:cc stable
>   drivers/phy/tegra/xusb.c       | 13 +++++++++++++
>   include/linux/phy/tegra/xusb.h |  1 +
>   2 files changed, 14 insertions(+)
> 
> diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
> index 142ebe0247cc..983a6e6173bd 100644
> --- a/drivers/phy/tegra/xusb.c
> +++ b/drivers/phy/tegra/xusb.c
> @@ -1531,6 +1531,19 @@ int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl,
>   }
>   EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get_usb3_companion);
>   
> +int tegra_xusb_padctl_get_port_number(struct phy *phy)
> +{
> +	struct tegra_xusb_lane *lane;
> +
> +	if (!phy)
> +		return -ENODEV;
> +
> +	lane = phy_get_drvdata(phy);
> +
> +	return lane->index;
> +}
> +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get_port_number);
> +
>   MODULE_AUTHOR("Thierry Reding <treding@...dia.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 70998e6dd6fd..6ca51e0080ec 100644
> --- a/include/linux/phy/tegra/xusb.h
> +++ b/include/linux/phy/tegra/xusb.h
> @@ -26,6 +26,7 @@ void tegra_phy_xusb_utmi_pad_power_down(struct phy *phy);
>   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);
> +int tegra_xusb_padctl_get_port_number(struct phy *phy);
>   int tegra_xusb_padctl_enable_phy_sleepwalk(struct tegra_xusb_padctl *padctl, struct phy *phy,
>   					   enum usb_device_speed speed);
>   int tegra_xusb_padctl_disable_phy_sleepwalk(struct tegra_xusb_padctl *padctl, struct phy *phy);



Reviewed-by: Jon Hunter <jonathanh@...dia.com>
Tested-by: Jon Hunter <jonathanh@...dia.com>

Thanks!

Jon

-- 
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