[U-Boot] [PATCH 4/4] README: add documentation for CONFIG_USB_ULPI*

[Igor Grinberg]

Hi Simon,

On 12/14/11 02:28, Simon Glass wrote:
> Hi Igor,
> 
> On Mon, Dec 12, 2011 at 2:08 AM, Igor Grinberg <grinberg at compulab.co.il> wrote:
>> Add documentation for CONFIG_USB_ULPI and CONFIG_USB_ULPI_VIEWPORT
>> configuration options.
>>
>> Signed-off-by: Igor Grinberg <grinberg at compulab.co.il>
>> ---
>>  README |    8 ++++++++
>>  1 files changed, 8 insertions(+), 0 deletions(-)
>>
>> diff --git a/README b/README
>> index ff72e47..6fe1e0f 100644
>> --- a/README
>> +++ b/README
>> @@ -1185,6 +1185,14 @@ The following options need to be configured:
>>                        for your device
>>                        - CONFIG_USBD_PRODUCTID 0xFFFF
>>
>> +- ULPI Layer Support:
>> +               The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
>> +               the generic ULPI layer. The generic layer accesses the ULPI PHY
>> +               via the platform viewport, so you need both the genric layer and
>> +               the viewport enabled. Currently only Chipidea/ARC based
>> +               viewport is supported.
> 
> Where does it say that only this one is supported in the code?

You mean comments or the code?

> What is specific to that device?

The viewport bits? It is not a part of the ULPI spec.
Other vendors do not have to comply with those.
For example PXA310 has those bits placed and named in some other way...

> 
> Regards,
> Simon
> 
>> +               To enable the ULPI layer support, define CONFIG_USB_ULPI and
>> +               CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
>>
>>  - MMC Support:
>>                The MMC controller on the Intel PXA is supported. To
>> --
>> 1.7.3.4
>>
> 

-- 
Regards,
Igor.