linux-kernel - Re: [PATCH v1] usb: phy: add usb phy notify port status API

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Date:   Fri, 21 Apr 2023 10:19:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Stanley Chang <stanley_chang@...ltek.com>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Douglas Anderson <dianders@...omium.org>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Bhuvanesh Surachari <Bhuvanesh_Surachari@...tor.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Flavio Suligoi <f.suligoi@...m.it>,
        Ray Chi <raychi@...gle.com>,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] usb: phy: add usb phy notify port status API

On Fri, Apr 21, 2023 at 04:03:31PM +0800, 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 port status change.
> 
> Signed-off-by: Stanley Chang <stanley_chang@...ltek.com>
> ---
>  drivers/usb/core/hub.c  | 13 +++++++++++++
>  include/linux/usb/phy.h | 14 ++++++++++++++
>  2 files changed, 27 insertions(+)

We can not add callbacks in the kernel that are not actually used,
otherwise they will just be instantly removed.

Please submit any drivers that need this change at the same time so that
we can verify that the callback is actually correct and needed,
otherwise we can not take this change.

thanks,

greg k-h