linux-kernel - Re: [PATCH v3 1/4] phy: core: add notify_connect and notify

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Message-ID: <2d234d31-3045-72f2-57db-db03515eebcf@amd.com>
Date:   Tue, 21 Nov 2023 11:17:21 +0530
From:   Kishon Vijay Abraham I <kvijayab@....com>
To:     Stanley Chang <stanley_chang@...ltek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Vinod Koul <vkoul@...nel.org>, Johan Hovold <johan@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Jinjie Ruan <ruanjinjie@...wei.com>,
        Rob Herring <robh@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Yang Yingliang <yangyingliang@...wei.com>,
        Flavio Suligoi <f.suligoi@...m.it>,
        Roy Luo <royluo@...gle.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Ricardo Cañuelo <ricardo.canuelo@...labora.com>,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v3 1/4] phy: core: add notify_connect and
 notify_disconnect callback

Hi Stanley,

On 11/10/2023 11:15 AM, Stanley Chang wrote:
> In Realtek SoC, the parameter of usb phy is designed to can dynamic
> tuning base on port status. Therefore, add a notify callback of phy
> driver when usb connection/disconnection change.
> 
> Signed-off-by: Stanley Chang <stanley_chang@...ltek.com>
> ---
> v1 to v2:
>      No change
> v2 to v3:
>      No change
> ---
>   drivers/phy/phy-core.c  | 47 +++++++++++++++++++++++++++++++++++++++++
>   include/linux/phy/phy.h | 18 ++++++++++++++++
>   2 files changed, 65 insertions(+)
> 
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index 96a0b1e111f3..a84ad4896b7f 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -489,6 +489,53 @@ int phy_calibrate(struct phy *phy)
>   }
>   EXPORT_SYMBOL_GPL(phy_calibrate);
>   
> +/**
> + * phy_notify_connect() - phy connect notify
> + * @phy: the phy returned by phy_get()
> + * @port: the port index for connect
> + *
> + * If phy need the get connection status, the callback can be used.
> + * Returns: %0 if successful, a negative error code otherwise
> + */
> +int phy_notify_connect(struct phy *phy, int port)
> +{
> +	int ret;
> +
> +	if (!phy || !phy->ops->connect)
> +		return 0;
> +
> +	mutex_lock(&phy->mutex);
> +	ret = phy->ops->connect(phy, port);
> +	mutex_unlock(&phy->mutex);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(phy_notify_connect);
> +
> +/**
> + * phy_notify_disconnect() - phy disconnect notify
> + * @phy: the phy returned by phy_get()
> + * @port: the port index for disconnect
> + *
> + * If phy need the get disconnection status, the callback can be used.
> + *
> + * Returns: %0 if successful, a negative error code otherwise
> + */
> +int phy_notify_disconnect(struct phy *phy, int port)
> +{
> +	int ret;
> +
> +	if (!phy || !phy->ops->disconnect)
> +		return 0;
> +
> +	mutex_lock(&phy->mutex);
> +	ret = phy->ops->disconnect(phy, port);
> +	mutex_unlock(&phy->mutex);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(phy_notify_disconnect);

Please use EXTCON framework for notifying connect/disconnect.

Thanks,
Kishon