linux-kernel - Re: [PATCH] ARM: dts: imx5: Add dts files for USB armory.

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Date:	Wed, 13 May 2015 10:53:28 -0700
From:	Vagrant Cascadian <vagrant@...ian.org>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	devicetree@...r.kernel.org, Andrej Rosano <andrej@...ersepath.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Sascha Hauer <kernel@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: imx5: Add dts files for USB armory.

On 2015-04-27, Vagrant Cascadian wrote:
> On 2015-04-27, Shawn Guo wrote:
>> On Fri, Mar 27, 2015 at 01:23:00PM -0700, Vagrant Cascadian wrote:
>>> Add support for the USB armory board by Inverse Path. This board
>>> features a Freescale iMX53 SoC, 512MB RAM, and USB OTG operating in
>>> either peripheral or host mode, and 5 GPIO pins.
>>> 
>>> One .dtb is generated for operating in peripheral mode, and one is
>>> generated for operating in host mode.
>>
>> Is it possible to ask bootloader to patch the dtb instead of maintaining
>> a new one for just changing one USB property?
>
> It does appear to be possible with u-boot:
>
>   load mmc 0:1 $fdt_addr_r $fdtfile
>   fdt addr $fdt_addr_r
>   fdt set /soc/aips@...00000/usb@...80000 dr_mode host
>
> Since the user would have to manually select the appropriate .dtb
> anyways, it may be reasonable to drop the host_mode.dtb and rely on the
> u-boot to tweak the fdt on boot to switch between usb modes.

Given that it is possible to set from u-boot, I'm wondering if it
wouldn't be worth reworking the patch to only generate a single .dtb for
now, and revisit the options for switching between USB host mode and
peripheral mode later?

live well,
  vagrant

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