From: Vagrant Cascadian <vagrant@debian.org>
To: Shawn Guo <shawn.guo@linaro.org>
Cc: devicetree@vger.kernel.org,
Andrej Rosano <andrej@inversepath.com>,
Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
Russell King <linux@arm.linux.org.uk>,
Sascha Hauer <kernel@pengutronix.de>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ARM: dts: imx5: Add dts files for USB armory.
Date: Wed, 13 May 2015 10:53:28 -0700 [thread overview]
Message-ID: <87vbfwe547.fsf@aikidev.net> (raw)
In-Reply-To: <87y4ldnvqd.fsf@aikidev.net>
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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@50000000/usb@53f80000 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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next prev parent reply other threads:[~2015-05-13 17:53 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-27 20:23 Vagrant Cascadian
2015-04-27 8:14 ` Shawn Guo
2015-04-27 20:48 ` Vagrant Cascadian
2015-05-13 17:53 ` Vagrant Cascadian [this message]
2015-05-13 18:08 ` Fabio Estevam
2015-04-27 11:57 ` Shawn Guo
2015-04-27 13:37 ` Andrej Rosano
2015-04-28 8:20 ` Peter Chen
2015-04-30 2:22 ` Fabio Estevam
2015-04-30 8:51 ` Peter Chen
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