linux-kernel - Re: [PATCH v14 2/7] PM / wakeup: Add device_children_wakeup

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Date:   Fri, 22 Apr 2022 13:57:17 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Linux PM <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:ULTRA-WIDEBAND (UWB) SUBSYSTEM:" 
        <linux-usb@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        quic_pkondeti@...cinc.com, quic_ppratap@...cinc.com,
        quic_kriskura@...cinc.com, quic_vpulyala@...cinc.com
Subject: Re: [PATCH v14 2/7] PM / wakeup: Add device_children_wakeup_capable()

On Tue, Apr 19, 2022 at 9:11 PM Sandeep Maheswaram
<quic_c_sanm@...cinc.com> wrote:
>
> From: Matthias Kaehlcke <mka@...omium.org>
>
> Add device_children_wakeup_capable() which checks whether the device itself
> or one if its descendants is wakeup capable.

device_wakeup_path() exists for a very similar purpose.

Is it not usable for whatever you need the new function introduced here?

> Suggested-by: Felipe Balbi <balbi@...nel.org>
> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
>  drivers/base/power/wakeup.c | 18 ++++++++++++++++++
>  include/linux/pm_wakeup.h   |  7 +++++++
>  2 files changed, 25 insertions(+)
>
> diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
> index a57d469..1900637 100644
> --- a/drivers/base/power/wakeup.c
> +++ b/drivers/base/power/wakeup.c
> @@ -541,6 +541,24 @@ int device_set_wakeup_enable(struct device *dev, bool enable)
>  }
>  EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
>
> +static int __device_children_wakeup_capable(struct device *dev, void *dummy)
> +{
> +       return device_may_wakeup(dev) ||
> +               device_for_each_child(dev, NULL, __device_children_wakeup_capable);
> +}
> +
> +/**
> + * device_children_wakeup_capable - Check whether a device or one of its descendants is
> + *                                  wakeup capable.
> + * @dev: Device to handle.
> + */
> +bool device_children_wakeup_capable(struct device *dev)
> +{
> +       return __device_children_wakeup_capable(dev, NULL);
> +}
> +EXPORT_SYMBOL_GPL(device_children_wakeup_capable);
> +
> +
>  /**
>   * wakeup_source_not_registered - validate the given wakeup source.
>   * @ws: Wakeup source to be validated.
> diff --git a/include/linux/pm_wakeup.h b/include/linux/pm_wakeup.h
> index 196a157..9a3005b 100644
> --- a/include/linux/pm_wakeup.h
> +++ b/include/linux/pm_wakeup.h
> @@ -109,6 +109,7 @@ extern struct wakeup_source *wakeup_sources_walk_next(struct wakeup_source *ws);
>  extern int device_wakeup_enable(struct device *dev);
>  extern int device_wakeup_disable(struct device *dev);
>  extern void device_set_wakeup_capable(struct device *dev, bool capable);
> +extern bool device_children_wakeup_capable(struct device *dev);
>  extern int device_init_wakeup(struct device *dev, bool val);
>  extern int device_set_wakeup_enable(struct device *dev, bool enable);
>  extern void __pm_stay_awake(struct wakeup_source *ws);
> @@ -186,6 +187,12 @@ static inline bool device_wakeup_path(struct device *dev)
>
>  static inline void device_set_wakeup_path(struct device *dev) {}
>
> +static inline bool device_children_wakeup_capable(struct device *dev)
> +{
> +       return false;
> +}
> +
> +
>  static inline void __pm_stay_awake(struct wakeup_source *ws) {}
>
>  static inline void pm_stay_awake(struct device *dev) {}
> --
> 2.7.4
>