On Tue, Dec 20, 2022 at 12:45:01AM +0000, Matthias Kaehlcke wrote:
> Some boards have device tree nodes for USB hubs supported by the
> onboard_usb_hub driver, but the nodes don't have all properties
> needed for the driver to work properly (which is not necessarily
> an error in the DT). Currently _find_onboard_hub() returns
> -EPROBE_DEFER in such cases, which results in an unusable USB hub,
> since successive probes fail in the same way. Use the absence of
> the "vdd" supply as an indicator of such 'incomplete' DT nodes
> and return -ENODEV.
>
> Fixes: 8bc063641ceb ("usb: misc: Add onboard_usb_hub driver")
> Reported-by: Stefan Wahren <stefan.wahren@xxxxxxxx>
> Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
> ---
>
> drivers/usb/misc/onboard_usb_hub.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/usb/misc/onboard_usb_hub.c b/drivers/usb/misc/onboard_usb_hub.c
> index d63c63942af1..2968da515016 100644
> --- a/drivers/usb/misc/onboard_usb_hub.c
> +++ b/drivers/usb/misc/onboard_usb_hub.c
> @@ -363,6 +363,15 @@ static struct onboard_hub *_find_onboard_hub(struct device *dev)
> hub = dev_get_drvdata(&pdev->dev);
> put_device(&pdev->dev);
>
> + /*
> + * Some boards have device tree nodes for USB hubs supported by this
> + * driver, but the nodes don't have all properties needed for the driver
> + * to work properly. Use the absence of the "vdd" supply as an indicator
> + * of such nodes.
> + */
> + if (!of_get_property(pdev->dev.of_node, "vdd", NULL))
> + return ERR_PTR(-ENODEV);
Does this not break your original use case? Don't you want "vdd-supply"
here?
That said, this seems like the wrong property to look for both in
principle and as it is described as optional by the binding:
Documentation/devicetree/bindings/usb/realtek,rts5411.yaml
It seems that you should use the compatible property and check that it
holds one of the expected values:
- usbbda,5411
- usbbda,411
rather than treat every hub node as describing a realtek hub (AFAIK,
there is no generic binding for this yet).
> +
> /*
> * The presence of drvdata ('hub') indicates that the platform driver
> * finished probing. This handles the case where (conceivably) we could
Johan
