dts: question about how to configure PIO used as i2c irq

dts: question about how to configure PIO used as i2c irq

[Bo Shen]

Hi All,
   When moving atmel qt1070 linux driver with DT support. The atmel 
qt1070 is an I2C device. I meet the following questions.

   The qt1070 DT node
   --<--------------
   qt1070: keyboard@1b {
         compatible = "atmel,qt1070";
         reg = <0x1b>;
         interrupt-parent = <&pioA>;
         interrupts = <7 0x0>;
   };
   -->--------------

   DT will parse this node and map irq, the i2c_client->irq. This can be 
used directly in atmel qt1070 driver. However, the PIO which used as irq 
need configure as a PIO input. Now, we can not use irq_to_gpio() 
function to convert irq to gpio. So, if we can not configure this gpio.

   If we configure the pio in board-dt.c, I think this is not a good 
place. For example, if the kernel image support multiplatform, while on 
these platform, using different pio for qt1070, so this will cause only 
one platform can use qt1070.

   So, for this question, how should I solve it? Would you please give 
me some advice?

Re: dts: question about how to configure PIO used as i2c irq

[Jean-Christophe PLAGNIOL-VILLARD]

On 10:53 Mon 15 Oct     , Bo Shen wrote:
> Hi All,
>   When moving atmel qt1070 linux driver with DT support. The atmel
> qt1070 is an I2C device. I meet the following questions.
> 
>   The qt1070 DT node
>   --<--------------
>   qt1070: keyboard@1b {
>         compatible = "atmel,qt1070";
>         reg = <0x1b>;
>         interrupt-parent = <&pioA>;
>         interrupts = <7 0x0>;
>   };
>   -->--------------
> 
>   DT will parse this node and map irq, the i2c_client->irq. This can
> be used directly in atmel qt1070 driver. However, the PIO which used
> as irq need configure as a PIO input. Now, we can not use
> irq_to_gpio() function to convert irq to gpio. So, if we can not
> configure this gpio.
> 
>   If we configure the pio in board-dt.c, I think this is not a good
> place. For example, if the kernel image support multiplatform, while
> on these platform, using different pio for qt1070, so this will
> cause only one platform can use qt1070.
> 
>   So, for this question, how should I solve it? Would you please
> give me some advice?
I already reply you in private 4 times

you have only 2 choice pass the gpio and manage in c
or configure the gpio as input in the xlate or map of the gpio drivers and the
mux via pinctrl

Best Regards,
J.

Re: dts: question about how to configure PIO used as i2c irq

[Nicolas Ferre]

On 10/15/2012 07:57 AM, Jean-Christophe PLAGNIOL-VILLARD :
> On 10:53 Mon 15 Oct     , Bo Shen wrote:
>> Hi All,
>>   When moving atmel qt1070 linux driver with DT support. The atmel
>> qt1070 is an I2C device. I meet the following questions.
>>
>>   The qt1070 DT node
>>   --<--------------
>>   qt1070: keyboard@1b {
>>         compatible = "atmel,qt1070";
>>         reg = <0x1b>;
>>         interrupt-parent = <&pioA>;
>>         interrupts = <7 0x0>;
>>   };
>>   -->--------------
>>
>>   DT will parse this node and map irq, the i2c_client->irq. This can
>> be used directly in atmel qt1070 driver. However, the PIO which used
>> as irq need configure as a PIO input. Now, we can not use
>> irq_to_gpio() function to convert irq to gpio. So, if we can not
>> configure this gpio.
>>
>>   If we configure the pio in board-dt.c, I think this is not a good
>> place. For example, if the kernel image support multiplatform, while
>> on these platform, using different pio for qt1070, so this will
>> cause only one platform can use qt1070.
>>
>>   So, for this question, how should I solve it? Would you please
>> give me some advice?
> I already reply you in private 4 times

Yes, but maybe it is because it was not well explained, or not developed
to the proper extend... So, please do not make these remarks: if the
conversation was private, it is not necessary to recall that here. Maybe
Voice is looking for help from someone else?

> you have only 2 choice pass the gpio and manage in c
> or configure the gpio as input in the xlate or map of the gpio drivers and the
> mux via pinctrl

Can you please develop a bit more: which xlate? How to tell the gpio
driver about the map? Can you provide an example?

Bye,
-- 
Nicolas Ferre

Re: dts: question about how to configure PIO used as i2c irq

[Bo Shen]

Hi J,

On 10/15/2012 16:07, Nicolas Ferre wrote:
> On 10/15/2012 07:57 AM, Jean-Christophe PLAGNIOL-VILLARD :
>> On 10:53 Mon 15 Oct     , Bo Shen wrote:
>>> Hi All,
>>>    When moving atmel qt1070 linux driver with DT support. The atmel
>>> qt1070 is an I2C device. I meet the following questions.
>>>
>>>    The qt1070 DT node
>>>    --<--------------
>>>    qt1070: keyboard@1b {
>>>          compatible = "atmel,qt1070";
>>>          reg = <0x1b>;
>>>          interrupt-parent = <&pioA>;
>>>          interrupts = <7 0x0>;
>>>    };
>>>    -->--------------
>>>
>>>    DT will parse this node and map irq, the i2c_client->irq. This can
>>> be used directly in atmel qt1070 driver. However, the PIO which used
>>> as irq need configure as a PIO input. Now, we can not use
>>> irq_to_gpio() function to convert irq to gpio. So, if we can not
>>> configure this gpio.
>>>
>>>    If we configure the pio in board-dt.c, I think this is not a good
>>> place. For example, if the kernel image support multiplatform, while
>>> on these platform, using different pio for qt1070, so this will
>>> cause only one platform can use qt1070.
>>>
>>>    So, for this question, how should I solve it? Would you please
>>> give me some advice?
>> I already reply you in private 4 times
>
> Yes, but maybe it is because it was not well explained, or not developed
> to the proper extend... So, please do not make these remarks: if the
> conversation was private, it is not necessary to recall that here. Maybe
> Voice is looking for help from someone else?
>
>> you have only 2 choice pass the gpio and manage in c
>> or configure the gpio as input in the xlate or map of the gpio drivers and the
>> mux via pinctrl
>
> Can you please develop a bit more: which xlate? How to tell the gpio
> driver about the map? Can you provide an example?

Any information for this? Search with google, I don't find any useful 
information.

> Bye,
>