linux-kernel - Re: [PATCH v1 2/2] ARM: dts: rockchip: set dr

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Date:	Sun, 26 Apr 2015 12:16:05 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Yunzhi Li <lyz@...k-chips.com>
Cc:	cf@...k-chips.com, hl@...k-chips.com, yk@...k-chips.com,
	gauravsh@...gle.com, alberto@...gle.com, wulf@...k-chips.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>,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] ARM: dts: rockchip: set dr_mode property for rk3288-firefly board

Hi,

Am Sonntag, 26. April 2015, 17:41:39 schrieb Yunzhi Li:
> rk3288-firefly board use the dwc2 usb otg controller as a host
> controller and the device mode not used, so the dr_mode should be
> "host" then the dwc2 usb otg controller will work at host only
> mode
> 
> Signed-off-by: Yunzhi Li <lyz@...k-chips.com>

Not sure I understand. Is this some sort of hardware limitation? Because when 
for example flashing a kernel via upgrade_tool it is working just fine as 
gadget.

If it is a software choice, this should not be made in the devicetree, as the 
dt describes the hardware alone.


Heiko


> 
> ---
> 
>  arch/arm/boot/dts/rk3288-firefly.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/boot/dts/rk3288-firefly.dtsi
> b/arch/arm/boot/dts/rk3288-firefly.dtsi index e6f873a..a861776 100644
> --- a/arch/arm/boot/dts/rk3288-firefly.dtsi
> +++ b/arch/arm/boot/dts/rk3288-firefly.dtsi
> @@ -466,6 +466,7 @@
>  };
> 
>  &usb_otg {
> +	dr_modr = "host";
>  	status = "okay";
>  };

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