Re: [RFC] dt: export of_have_populated_dt

[Rob Herring <robherring2@gmail.com>]

On 04/10/2012 11:29 AM, Cousson, Benoit wrote:
> Hi Chris,
> 
> On 4/10/2012 6:21 PM, Chris Ball wrote:
>> Hi,
>>
>> On Tue, Apr 10 2012, Cousson, Benoit wrote:
>>> Hi Balaji,
>>>
>>> On 4/10/2012 5:11 PM, Balaji T K wrote:
>>>> If of_have_populated_dt is called from module, build fails with
>>>> "allnodes"
>>>> undefined error, so remove inline and export of_have_populated_dt.
>>>
>>> Is this function really called from the MMC driver?
>>
>> ~/git/linux % git grep of_have_populated_dt drivers/
>> drivers/gpio/gpio-samsung.c:    if (!of_have_populated_dt())
>> drivers/mmc/host/omap_hsmmc.c:  if (of_have_populated_dt()&&  !vdd)
>> drivers/mmc/host/omap_hsmmc.c:                  
>> (!of_have_populated_dt())) {
> 
> Gosh, twice... I should be in a wrong branch :-(
> 
> Then the next question to Rob...
> 
> Rob,
> Does it make sense to use that in the driver? So far I was using that
> only in the arch code to make the difference between the DT boot and the
> non-DT boot.
> 
> I guess that a driver should rely on of_match_device or non-NULL
> device_node to figure out that?
> 

Agreed. of_match_device or device_node ptr check is the right approach.

Rob

> Thanks,
> Benoit