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SubjectRe: [PATCH] rtc: imxdi: add wakeup support
Hello,

On 30/04/2021 11:32:10+0200, Martin Kaiser wrote:
> The DryIce-based RTC supports alarms that trigger an interrupt.
>
> Add an option to configure this interrupt as a wakeup source that wakes
> the system up from standby mode.
>
> Signed-off-by: Martin Kaiser <martin@kaiser.cx>
> ---
>
> simple test
>
> [root@board ]# echo enabled > /sys/class/rtc/rtc0/device/power/wakeup
> [root@board ]# rtcwake -s 3 -m mem
> wakeup from "mem" at Fri Apr 30 09:23:52 2021
> ...
> [root@board ]#
>
> drivers/rtc/rtc-imxdi.c | 39 ++++++++++++++++++++++++++++++++++-----
> 1 file changed, 34 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/rtc/rtc-imxdi.c b/drivers/rtc/rtc-imxdi.c
> index c1806f4d68e7..63957be25759 100644
> --- a/drivers/rtc/rtc-imxdi.c
> +++ b/drivers/rtc/rtc-imxdi.c
> @@ -98,6 +98,7 @@
> * @pdev: pointer to platform dev
> * @rtc: pointer to rtc struct
> * @ioaddr: IO registers pointer
> + * @norm_irq: irq number of the "normal" irq
> * @clk: input reference clock
> * @dsr: copy of the DSR register
> * @irq_lock: interrupt enable register (DIER) lock
> @@ -109,6 +110,7 @@ struct imxdi_dev {
> struct platform_device *pdev;
> struct rtc_device *rtc;
> void __iomem *ioaddr;
> + int norm_irq;
> struct clk *clk;
> u32 dsr;
> spinlock_t irq_lock;
> @@ -741,7 +743,7 @@ static void dryice_work(struct work_struct *work)
> static int __init dryice_rtc_probe(struct platform_device *pdev)
> {
> struct imxdi_dev *imxdi;
> - int norm_irq, sec_irq;
> + int sec_irq;
> int rc;
>
> imxdi = devm_kzalloc(&pdev->dev, sizeof(*imxdi), GFP_KERNEL);
> @@ -756,9 +758,9 @@ static int __init dryice_rtc_probe(struct platform_device *pdev)
>
> spin_lock_init(&imxdi->irq_lock);
>
> - norm_irq = platform_get_irq(pdev, 0);
> - if (norm_irq < 0)
> - return norm_irq;
> + imxdi->norm_irq = platform_get_irq(pdev, 0);
> + if (imxdi->norm_irq < 0)
> + return imxdi->norm_irq;
>
> /* the 2nd irq is the security violation irq
> * make this optional, don't break the device tree ABI
> @@ -795,7 +797,7 @@ static int __init dryice_rtc_probe(struct platform_device *pdev)
> if (rc != 0)
> goto err;
>
> - rc = devm_request_irq(&pdev->dev, norm_irq, dryice_irq,
> + rc = devm_request_irq(&pdev->dev, imxdi->norm_irq, dryice_irq,
> IRQF_SHARED, pdev->name, imxdi);
> if (rc) {
> dev_warn(&pdev->dev, "interrupt not available.\n");
> @@ -811,6 +813,8 @@ static int __init dryice_rtc_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, imxdi);
>
> + device_set_wakeup_capable(&pdev->dev, true);

Maybe it makes sense to simply use device_init_wakeup here.

> +
> imxdi->rtc->ops = &dryice_rtc_ops;
> imxdi->rtc->range_max = U32_MAX;
>
> @@ -830,6 +834,8 @@ static int __exit dryice_rtc_remove(struct platform_device *pdev)
> {
> struct imxdi_dev *imxdi = platform_get_drvdata(pdev);
>
> + device_set_wakeup_capable(&pdev->dev, false);
> +
> flush_work(&imxdi->work);
>
> /* mask all interrupts */
> @@ -847,10 +853,33 @@ static const struct of_device_id dryice_dt_ids[] = {
>
> MODULE_DEVICE_TABLE(of, dryice_dt_ids);
>
> +#ifdef CONFIG_PM_SLEEP
> +static int dryice_suspend(struct device *dev)
> +{
> + struct imxdi_dev *imxdi = dev_get_drvdata(dev);
> +
> + if (device_may_wakeup(dev))
> + enable_irq_wake(imxdi->norm_irq);
> + return 0;
> +}
> +
> +static int dryice_resume(struct device *dev)
> +{
> + struct imxdi_dev *imxdi = dev_get_drvdata(dev);
> +
> + if (device_may_wakeup(dev))
> + disable_irq_wake(imxdi->norm_irq);
> + return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(dryice_pm, dryice_suspend, dryice_resume);
> +

I'm wondering, can't you use dev_pm_set_wake_irq to avoid having to
keep the changes to a minimum?

> static struct platform_driver dryice_rtc_driver = {
> .driver = {
> .name = "imxdi_rtc",
> .of_match_table = dryice_dt_ids,
> + .pm = &dryice_pm,
> },
> .remove = __exit_p(dryice_rtc_remove),
> };
> --
> 2.20.1
>

--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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