Re: [PATCH 15/26] ARM: omap4-panda.dts: add display information

[Tomi Valkeinen <tomi.valkeinen@ti.com>]

[-- Attachment #1: Type: text/plain, Size: 1387 bytes --]

On 2013-12-09 17:09, Javier Martinez Canillas wrote:
> Hi Tomi,
> 
> On Mon, Dec 9, 2013 at 1:56 PM, Tomi Valkeinen <tomi.valkeinen@ti.com> wrote:
>> On 2013-12-06 10:57, Javier Martinez Canillas wrote:
>>
>>>> +       tfp410: encoder@0 {
>>>> +               compatible = "ti,tfp410";
>>>> +               gpios = <&gpio1 0 0>;   /* 0, power-down */
>>>> +
>>>
>>> Please use the constants from include/dt-bindings/ instead of magic
>>> numbers, i.e:
>>>
>>> gpios = <&gpio1 0 GPIO_ACTIVE_HIGH>;   /* 0, power-down */
>>
>> Thanks, fixed now (for all .dts files)
>>
>> However... The TFP410 gpio is "power-down". I think we should actually
>> mark it as GPIO_ACTIVE_LOW, as setting it to 0 powers down the device.
>>
> 
> yes, I looked at the TFP410 datasheet [0] and the Power Down pin is
> indeed an active-low, I just replaced to GPIO_ACTIVE_HIGH since you
> were using a constant 0 and include/dt-bindings/gpio/gpio.h defines
> GPIO_ACTIVE_HIGH  as 0.
> 
> I just asked to Enric why we use GPIO_ACTIVE_HIGH for the PD pin on
> the IGEPv2 DTS instad and is because the IGEP board uses a hardware
> signal inverter but that is a special case. I don't know about the
> Panda board since I haven't looked at its datasheet.

Oh. Does it work on igep? The TFP410 driver always handles the PD GPIO
as it were active-low. The flag is ignored.

 Tomi



[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 901 bytes --]