linux-kernel - Re: [PATCH 3/4] dts: dra7-evm: add USB support

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Message-ID: <51FF7D2C.1090107@ti.com>
Date:	Mon, 5 Aug 2013 13:23:40 +0300
From:	Roger Quadros <rogerq@...com>
To:	George Cherian <george.cherian@...com>
CC:	<tony@...mide.com>, <rnayak@...com>, <benoit.cousson@...aro.org>,
	<balbi@...com>, <kishon@...com>, <dmurphy@...com>,
	<t-kristo@...com>, <linux-omap@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] dts: dra7-evm: add USB support

On 08/05/2013 12:03 PM, George Cherian wrote:
> On 8/5/2013 1:25 PM, Roger Quadros wrote:
>> On 08/02/2013 06:04 PM, George Cherian wrote:
>>> On 8/1/2013 8:28 PM, Roger Quadros wrote:
>>>> Add USB drv_vbus pinctrl information and USB mode
>>>> for the USB controller.
>>>>
>>>> Signed-off-by: Roger Quadros <rogerq@...com>
>>>> ---
>>>>    arch/arm/boot/dts/dra7-evm.dts |   22 ++++++++++++++++++++++
>>>>    1 files changed, 22 insertions(+), 0 deletions(-)
>>>>
>>>> diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
>>>> index cb0703c..acd3c09 100644
>>>> --- a/arch/arm/boot/dts/dra7-evm.dts
>>>> +++ b/arch/arm/boot/dts/dra7-evm.dts
>>>> @@ -18,3 +18,25 @@
>>>>            reg = <0x80000000 0x60000000>; /* 1536 MB */
>>>>        };
>>>>    };
>>>> +
>>>> +&dra7_pmx_core {
>>>> +        pinctrl-names = "default";
>>>> +        pinctrl-0 = <
>>>> +        &usb_pins
>>>> +    >;
>>>> +
>>>> +    usb_pins: pinmux_usb_pins {
>>>> +                pinctrl-single,pins = <
>>>> +            0x280    0xc0000    /* usb1_drvvbus, SLOW_SLEW | PULLUPEN | MODE0 */
>>>> +            0x284    0xc0000 /* usb2_drvvbus, SLOW_SLEW | PULLUPEN | MODE0 */
>>>> +                >;
>>>> +        };
>>>> +};
>>>> +
>>>> +&dwc3_1 {
>>>> +    dr_mode = "otg";
>>> otg???
>> What's wrong there?
>> please see
>> Documentation/devicetree/bindings/usb/generic.txt
>>
>> we want it to operate in dual role mode and hence "otg"
> 
> Am sorry for not being clear with my earlier comment.
> I meant whether we have otg/ DRD working. Till then shouldnt we put either peripheral/host?

Setting it to peripheral did not work and I don't think it is meant to be used as host port at all
so no point in setting it has host. Users needing host support can always use usb2 port.
The kit comes supplied with host adapter only for the usb2 (mini) port.

So I think we should just leave usb1 port OTG, and get it to work somehow, at least in peripheral mode
first.

cheers,
-roger

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