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

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Message-ID: <20200128165144.GB3666045@kroah.com>
Date:   Tue, 28 Jan 2020 17:51:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Mans Rullgard <mans@...sr.com>
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: [RESEND][PATCH 2/2] usb: hub: use non-removable-ports DT property

On Fri, Jan 24, 2020 at 03:25:04PM +0000, Mans Rullgard wrote:
> 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 | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 4ac74b354801..97f8f15fb632 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -1366,6 +1366,9 @@ 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) {
> @@ -1667,6 +1670,19 @@ 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,
> +				 "bad port number %u in non-removable-ports\n",
> +				 val);
> +			continue;
> +		}
> +
> +		hub->ports[val - 1]->connect_type =
> +			USB_PORT_CONNECT_TYPE_HARD_WIRED;
> +	}
> +

Is this doing the same thing that ACPI does?  It doesn't seem like it,
why not do this in usb_hub_adjust_deviceremovable()?  Or wherever ACPI
does this...

thanks,

greg k-h