linux-kernel - Re: [PATCH 2/2] input: imx_sc

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Date:   Tue, 2 May 2023 16:53:03 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Peng Fan <peng.fan@....nxp.com>
Cc:     Peng Fan <peng.fan@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Aisheng Dong <aisheng.dong@....com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH 2/2] input: imx_sc_key: add wakeup support

On Thu, 20 Apr 2023 at 09:54, Peng Fan <peng.fan@....nxp.com> wrote:
>
> Dmitry,Ulf
>
> On 4/18/2023 4:32 PM, Ulf Hansson wrote:
> > On Wed, 12 Apr 2023 at 17:58, Peng Fan <peng.fan@....com> wrote:
> >>
> >> +Ulf
> >>
> >>> Subject: RE: [PATCH 2/2] input: imx_sc_key: add wakeup support
> >>>
> >>>> Subject: Re: [PATCH 2/2] input: imx_sc_key: add wakeup support
> >>>>
> >>>> On Thu, Mar 23, 2023 at 05:31:41PM +0800, Peng Fan (OSS) wrote:
> >>>>> From: Peng Fan <peng.fan@....com>
> >>>>>
> >>>>> Add support for waking up from system wide suspend.
> >>>>>
> >>>>> Signed-off-by: Peng Fan <peng.fan@....com>
> >>>>> ---
> >>>>>   drivers/input/keyboard/imx_sc_key.c | 2 ++
> >>>>>   1 file changed, 2 insertions(+)
> >>>>>
> >>>>> diff --git a/drivers/input/keyboard/imx_sc_key.c
> >>>> b/drivers/input/keyboard/imx_sc_key.c
> >>>>> index d18839f1f4f6..234f23cf9990 100644
> >>>>> --- a/drivers/input/keyboard/imx_sc_key.c
> >>>>> +++ b/drivers/input/keyboard/imx_sc_key.c
> >>>>> @@ -151,6 +151,8 @@ static int imx_sc_key_probe(struct
> >>>> platform_device *pdev)
> >>>>>    priv->input = input;
> >>>>>    platform_set_drvdata(pdev, priv);
> >>>>>
> >>>>> + device_init_wakeup(&pdev->dev,
> >>>> device_property_read_bool(&pdev->dev, "wakeup-source"));
> >>>>> +
> >>>>
> >>>> I wonder - could we move this to the device core?
> >>>
> >>> I see lots device drivers parse wakeup-source, so I also follow That. Not sure
> >>> whether could move this feature to device core, but anyway I could give a
> >>> try.
> >>
> >> Do you think it is feasible to move device_init_wakeup into device core
> >> part?
> >
> > Not sure it would really improve things that much. Subsystems/drivers
> > need to make additional configurations based upon whether this DT
> > property is set anyway.
> >
> > Perhaps an option is to make this a part of the common input subsystem
> > helper functions instead? Other subsystems do this, but I am not sure
> > how feasible that would be in the input case.
>
> How do you think of below patch?

Seems reasonable to me, but I can't really tell if this makes sense
for all input drivers.

Dmitry?

>
> diff --git a/drivers/input/input.c b/drivers/input/input.c
> index 37e876d45eb9..a98a9f37e1f5 100644
> --- a/drivers/input/input.c
> +++ b/drivers/input/input.c
> @@ -2402,6 +2402,10 @@ int input_register_device(struct input_dev *dev)
>                          __func__, dev_name(&dev->dev));
>                  devres_add(dev->dev.parent, devres);
>          }
> +
> +       if (device_property_read_bool(input->dev.parent, "wakeup-source"))
> +               device_init_wakeup(&pdev->dev, true);
> +
>          return 0;
>
>   err_device_del:
>

Kind regards
Uffe