linux-kernel - Re: [PATCH 2/2] usb: hub: use non-removable-ports DT property

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Message-ID: <yw1xlg1c1c3i.fsf@mansr.com>
Date:   Mon, 18 Mar 2019 14:38:57 +0000
From:   Måns Rullgård <mans@...sr.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] usb: hub: use non-removable-ports DT property

Mans Rullgard <mans@...sr.com> writes:

> Mark any ports listed in the non-removable-ports DT property as
> hardwired. This is useful for boards with built-in USB devices
> that cannot be (or have not been) marked as fixed in hardware.
>
> Signed-off-by: Mans Rullgard <mans@...sr.com>
> ---
>  drivers/usb/core/hub.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)

Any comments on these patches?

> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 3adff4da2ee1..44ac49a30be1 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -1328,6 +1328,9 @@ static int hub_configure(struct usb_hub *hub,
>  	unsigned unit_load;
>  	unsigned full_load;
>  	unsigned maxchild;
> +	struct property *prop;
> +	const __be32 *cur;
> +	u32 val;
>
>  	hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL);
>  	if (!hub->buffer) {
> @@ -1629,6 +1632,17 @@ static int hub_configure(struct usb_hub *hub,
>  		}
>  	}
>
> +	of_property_for_each_u32(hub_dev->of_node, "non-removable-ports",
> +				 prop, cur, val) {
> +		if (val < 1 || val > hdev->maxchild) {
> +			dev_warn(hub_dev, "port number %u out of range\n", val);
> +			continue;
> +		}
> +
> +		hub->ports[val - 1]->connect_type =
> +			USB_PORT_CONNECT_TYPE_HARD_WIRED;
> +	}
> +
>  	usb_hub_adjust_deviceremovable(hdev, hub->descriptor);
>
>  	hub_activate(hub, HUB_INIT);
> -- 
> 2.20.1
>

-- 
Måns Rullgård