Re: gpio-led driver

[Gadre Nayan <gadrenayan@gmail.com>]

Hi,

I used this:

/*
* XXX: Use a flat representation of the AM33XX interconnect.
* The real AM33XX interconnect network is quite complex.Since
* that will not bring real advantage to represent that in DT
* for the moment, just use a fake OCP bus entry to represent
* the whole bus hierarchy.
*/
ocp {
          compatible = "simple-bus";
          #address-cells = <1>;
          #size-cells = <1>;
           ranges;
            ti,hwmods = "l3_main";
           .
           .
           .
          dali_gpio {
             compatible = "arm,dali_gpio";
             dali_TX = <9>;
             dali_RX = <10>;
           };
}

Thanks
Nayan Gadre.

On Thu, Jul 21, 2016 at 11:19 AM, Raul Piper <raulpblooper@gmail.com> wrote:
> kindly cc the previous people in "To" .Sorry I missed in while replying you.
>
> On Thu, Jul 21, 2016 at 11:17 AM, Raul Piper <raulpblooper@gmail.com> wrote:
>> HI,
>>
>> On Thu, Jul 21, 2016 at 9:43 AM, Gadre Nayan <gadrenayan@gmail.com> wrote:
>>> Hi,
>>>
>>> OF stands for open firmware, OF uses a format to represent platform
>>> information, which is called a device tree.
>>>
>>> An example of how the driver extracts information from device  tree:
>>>
>>> #if defined(CONFIG_OF)
>>> static const struct of_device_id dali_of_ids[] =
>>> {
>>>        { .compatible = "arm,dali_gpio", },
>>>        {},
>>> };
>>>
>>> MODULE_DEVICE_TABLE(of, dali_of_ids);
>>> #endif
>>>
>>> static struct platform_driver dali_driver = {
>>>         .driver = {
>>>                         .name = "dali_gpio",
>>>                         .of_match_table = of_match_ptr(dali_of_ids),
>>>         },
>>>         .probe = Dali_probe,
>>>         .remove = Dali_remove,
>>> };
>>>
>>> The driver is going to fetch information from the device tree later on
>>> (in probe) using the compatible property mentioned. So if the tree has
>>> the same compatible string then subsequent information can be obtained
>>> from that device tree node.
>>>
>>> Thanks
>>>
>> Can you please post the coresponding dt binding code?
>>
>>> On Thu, Jul 21, 2016 at 9:42 AM, Gadre Nayan <gadrenayan@gmail.com> wrote:
>>>> Hi,
>>>>
>>>> OF stands for open firmware, OF uses a format to represent platform
>>>> information, which is called a device tree.
>>>>
>>>> An example of how the driver extracts information from device  tree:
>>>>
>>>> #if defined(CONFIG_OF)
>>>> static const struct of_device_id dali_of_ids[] =
>>>> {
>>>>        { .compatible = "arm,dali_gpio", },
>>>>        {},
>>>> };
>>>>
>>>> MODULE_DEVICE_TABLE(of, dali_of_ids);
>>>> #endif
>>>>
>>>> static struct platform_driver dali_driver = {
>>>>         .driver = {
>>>>                         .name = "dali_gpio",
>>>>                         .of_match_table = of_match_ptr(dali_of_ids),
>>>>         },
>>>>         .probe = Dali_probe,
>>>>         .remove = Dali_remove,
>>>> };
>>>>
>>>> The driver is going to fetch information from the device tree later on
>>>> (in probe) using the compatible property mentioned. So if the tree has
>>>> the same compatible string then subsequent information can be obtained
>>>> from that device tree node.
>>>>
>>>> Thanks
>>>> Nayan Gadre
>>>>
>>>> On Wed, Jul 20, 2016 at 8:30 PM, Anish Kumar
>>>> <anish198519851985@gmail.com> wrote:
>>>>>
>>>>>
>>>>> On Jul 20, 2016, at 4:15 AM, Raul Piper <raulpblooper@gmail.com> wrote:
>>>>>
>>>>> Hi,
>>>>> I wanted to know the part number
>>>>>
>>>>>
>>>>> What is part number?
>>>>>
>>>>> for the leds-gpio.c in the driver/leds folder and the device tree bindings
>>>>> for this driver .Can some one point out to me where in Linux kernel it is?
>>>>>
>>>>> Also why below line has been used.Is it mandatory?
>>>>> ...
>>>>> .of_match_table = of_gpio_leds_match,
>>>>>
>>>>>
>>>>> This is needed when you are using device tree for getting the board settings
>>>>> but you can also do the same without this as well. Read up on device tree in
>>>>> kernel Documentation folder.
>>>>>
>>>>> },
>>>>>
>>>>> thanks in advance ,
>>>>> Rp
>>>>>
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