Re: [PATCH] ARM: dts: imx5: Add dts files for USB armory.
From: Vagrant Cascadian
Date: Wed May 13 2015 - 13:53:40 EST
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?
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