linux-kernel - Re: [PATCH] Allow MUSB DSPS to use "force host" mode

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Date:	Fri, 22 Nov 2013 17:38:35 +0100
From:	Michael Grzeschik <mgr@...gutronix.de>
To:	Mark Jackson <mpfj-list@...flow.co.uk>
Cc:	linux-usb@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	Felipe Balbi <balbi@...com>, bigeasy@...utronix.de,
	Greg KH <gregkh@...uxfoundation.org>, jkosina@...e.cz,
	anatol.pomozov@...il.com,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCH] Allow MUSB DSPS to use "force host" mode

Hallo,

On Fri, Nov 22, 2013 at 03:55:59PM +0000, Mark Jackson wrote:
> The IDDIG input pin is normally used to determine the USB mode
> (i.e. HOST or DEVICE).
> 
> On some systems (e.g. AM335x) leaving this pin floating allows
> the USB mode to be set via software.
> 
> This patch adds support for this via the device tree.
> 
> Signed-off-by: Mark Jackson <mpfj@...flow.co.uk>
> ---
>  .../devicetree/bindings/usb/am33xx-usb.txt         |    2 ++
>  drivers/usb/musb/musb_dsps.c                       |   14 ++++++++++++++
>  include/linux/usb/musb.h                           |    1 +
>  3 files changed, 17 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/am33xx-usb.txt b/Documentation/devicetree/bindings/usb/am33xx-usb.txt
> index 20c2ff2..560b7ff 100644
> --- a/Documentation/devicetree/bindings/usb/am33xx-usb.txt
> +++ b/Documentation/devicetree/bindings/usb/am33xx-usb.txt
> @@ -47,6 +47,8 @@ USB
>  - dmas: specifies the dma channels
>  - dma-names: specifies the names of the channels. Use "rxN" for receive
>    and "txN" for transmit endpoints. N specifies the endpoint number.
> +- ti,force-host: specifies that the IDDIG input be ignored and the device be
> +  put into host mode regardless.

You should always CC devicetree-discuss if adding new bindings. Why
another binding anyway? We have the common binding dr_mode already.
Please use this and of_usb_get_dr_mode from drivers/usb/usb-common.c
instead.

Thanks,
Michael
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