[PATCH v3 2/4] usb: chipidea: core: detach power domain for ci_hdrc platform device

[Ulf Hansson]

On Tue, 2 Sept 2025 at 05:33, Peng Fan <peng.fan at nxp.com> wrote:
>
> From: Xu Yang <xu.yang_2 at nxp.com>
>
> When add a platform device by calling ci_hdrc_add_device(), this device
> will reuse OF node of its parent device. If power-domains property is
> provided in the OF node, both two platform devices will be attached to
> the same power domain. This should be unnecessary and may bring other
> inconsistent behavior. For example, to support wakeup capability, these
> two platform device need different power domain state. The parent device
> need NOT power domain on for out-band interrupt, but the ci_hdrc device
> need power domain on for in-band interrupt. The i.MX95 Soc support
> out-band wakeup interrupt, the user need to enable wakeup for the parent
> device, but if the user also enable wakeup for ci_hdrc device, the power
> domain will keep at on state finally. To exclude such inconsistent
> behavior and simplify the power management, detach power domain for ci_hdrc
> platform device.
>
> Signed-off-by: Xu Yang <xu.yang_2 at nxp.com>

Seems reasonable to me!

Reviewed-by: Ulf Hansson <ulf.hansson at linaro.org>

Kind regards
Uffe

> ---
>  drivers/usb/chipidea/core.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index 694b4a8e4e1d8583dcbf4a42f8c2dfd785d5745c..70597f40b9997a9766934c67bbbed38e96c210f8 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -27,6 +27,7 @@
>  #include <linux/kernel.h>
>  #include <linux/slab.h>
>  #include <linux/pm_runtime.h>
> +#include <linux/pm_domain.h>
>  #include <linux/pinctrl/consumer.h>
>  #include <linux/usb/ch9.h>
>  #include <linux/usb/gadget.h>
> @@ -915,6 +916,8 @@ struct platform_device *ci_hdrc_add_device(struct device *dev,
>         if (ret)
>                 goto err;
>
> +       dev_pm_domain_detach(&pdev->dev, false);
> +
>         return pdev;
>
>  err:
>
> --
> 2.37.1
>