Hi Sean,
> In order to open up the required power gate before any operation can be
> effectively performed over the serial bus between CPU and serdev, it's
> clearly essential to add common attach functions for PM domains to serdev
> at the probe phase.
>
> Similarly, the relevant dettach function for the PM domains should be
> properly and reversely added at the remove phase.
>
> Signed-off-by: Sean Wang <sean.wang@xxxxxxxxxxxx>
> Cc: Rob Herring <robh@xxxxxxxxxx>
> Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: Jiri Slaby <jslaby@xxxxxxxx>
> Cc: linux-serial@xxxxxxxxxxxxxxx
> ---
> drivers/tty/serdev/core.c | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
> index df93b72..c93d8ee 100644
> --- a/drivers/tty/serdev/core.c
> +++ b/drivers/tty/serdev/core.c
> @@ -13,6 +13,7 @@
> #include <linux/module.h>
> #include <linux/of.h>
> #include <linux/of_device.h>
> +#include <linux/pm_domain.h>
> #include <linux/serdev.h>
> #include <linux/slab.h>
>
> @@ -330,8 +331,16 @@ EXPORT_SYMBOL_GPL(serdev_device_set_tiocm);
> static int serdev_drv_probe(struct device *dev)
> {
> const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
> + int ret;
> +
> + ret = dev_pm_domain_attach(dev, true);
> + if (ret != -EPROBE_DEFER) {
> + ret = sdrv->probe(to_serdev_device(dev));
> + if (ret)
> + dev_pm_domain_detach(dev, true);
> + }
so if this is deferred, when does the serdev device gets probed?
>
> - return sdrv->probe(to_serdev_device(dev));
> + return ret;
> }
>
> static int serdev_drv_remove(struct device *dev)
> @@ -339,6 +348,9 @@ static int serdev_drv_remove(struct device *dev)
> const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
> if (sdrv->remove)
> sdrv->remove(to_serdev_device(dev));
> +
> + dev_pm_domain_detach(dev, true);
> +
> return 0;
> }
Regards
Marcel
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