linux-kernel - Re: [PATCH v2 4/5] drivers: pinctrl: qcom: sdm845: support GPIO wakeup from suspend

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Date:   Mon, 27 Aug 2018 19:44:33 -0600
From:   Lina Iyer <ilina@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     marc.zyngier@....com, sboyd@...nel.org, evgreen@...omium.org,
        linus.walleij@...aro.org, rplsssn@...eaurora.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        rnayak@...eaurora.org, devicetree@...r.kernel.org,
        andy.gross@...aro.org, dianders@...omium.org
Subject: Re: [PATCH v2 4/5] drivers: pinctrl: qcom: sdm845: support GPIO
 wakeup from suspend

On Mon, Aug 27 2018 at 18:31 -0600, Bjorn Andersson wrote:
>On Fri 24 Aug 13:01 PDT 2018, Lina Iyer wrote:
>
>> Enable TLMM IRQs to be sensed by PDC when we enter suspend. It is
>> possible that the TLMM may be powered off and not detect GPIOs that are
>> configured as wake up interrupts. By hooking into suspend callbacks, we
>> allow PDC IRQs to take over and wake up the system if wakeup interrupts
>> are triggered.
>>
>> Signed-off-by: Lina Iyer <ilina@...eaurora.org>
>> ---
>>  drivers/pinctrl/qcom/pinctrl-sdm845.c | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/drivers/pinctrl/qcom/pinctrl-sdm845.c b/drivers/pinctrl/qcom/pinctrl-sdm845.c
>> index 2ab7a8885757..cc333b8afb99 100644
>> --- a/drivers/pinctrl/qcom/pinctrl-sdm845.c
>> +++ b/drivers/pinctrl/qcom/pinctrl-sdm845.c
>> @@ -1297,10 +1297,16 @@ static const struct of_device_id sdm845_pinctrl_of_match[] = {
>>  	{ },
>>  };
>>
>> +static const struct dev_pm_ops msm_pinctrl_dev_pm_ops = {
>> +	SET_LATE_SYSTEM_SLEEP_PM_OPS(msm_pinctrl_suspend_late,
>> +				     msm_pinctrl_resume_late)
>> +};
>> +
>
>I expect these four lines to be duplicated in every platform file, so I
>think it would be better to just move it to pinctrl-msm.c and extern
>declare it in pinctrl-msm.h.
>
Sure.

>>  static struct platform_driver sdm845_pinctrl_driver = {
>>  	.driver = {
>>  		.name = "sdm845-pinctrl",
>>  		.of_match_table = sdm845_pinctrl_of_match,
>> +		.pm = &msm_pinctrl_dev_pm_ops,
>>  	},
>>  	.probe = sdm845_pinctrl_probe,
>>  	.remove = msm_pinctrl_remove,
>
>Regards,
>Bjorn