[U-Boot] [PATCH v3 4/4] x86: minnowmax: initialize the pin-muxing from device tree

[Gabriel Huau]

Hi Andy,

On 05/26/2015 01:01 AM, Andy Pont wrote:
> Hi Gabriel,
>
>>           soc_gpio_s5_0 at 0 {
>>               gpio-offset = <0x80 0>;
>>               pad-offset = <0x1d0>;
>>               mode-gpio;
>>               output-value = <0>;
>>               direction = <PIN_OUTPUT>;
>>           };
>>
>>           soc_gpio_s5_1 at 0 {
>>               gpio-offset = <0x80 1>;
>>               pad-offset = <0x210>;
>>               mode-gpio;
>>               output-value = <0>;
>>               direction = <PIN_OUTPUT>;
>>           };
>>
>>           soc_gpio_s5_2 at 0 {
>>               gpio-offset = <0x80 2>;
>>               pad-offset = <0x1e0>;
>>               mode-gpio;
>>               output-value = <0>;
>>               direction = <PIN_OUTPUT>;
>>           };
>>
>> And after, you can use the GPIO commands:
>>
>> => gpio set E0
>> gpio: pin E0 (gpio 128) value is 1
>> => gpio clear E0
>> gpio: pin E0 (gpio 128) value is 0
>> => gpio set E2
>> gpio: pin E2 (gpio 130) value is 1
>> => gpio clear E2
>> gpio: pin E2 (gpio 130) value is 0
>>
>> E0 E1 and E2 correspond to the GPIO0 1 and 2.
> Is there, or can someone add, some documentation somewhere as to how to
> convert between the device tree definition and the value used for "pin" in
> the gpio commands as it doesn't seem intuitive or obvious to me that what
> you have defined translates to E0, E1 and E2.
I agree, but I think the documentation should be part of another patch, 
especially as this is the case for all the x86 platform.
The naming is not specific to the minnowboard max (baytrail).

> Thanks,
>
> Andy.
>
Regards,
Gabriel