From: voice.shen@atmel•com (Bo Shen)
To: linux-arm-kernel@lists•infradead.org
Subject: dts: question about how to configure PIO used as i2c irq
Date: Fri, 19 Oct 2012 14:56:51 +0800 [thread overview]
Message-ID: <5080F9B3.5090708@atmel.com> (raw)
In-Reply-To: <507BC449.6070203@atmel.com>
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 at 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,
>
prev parent reply other threads:[~2012-10-19 6:56 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-15 2:53 dts: question about how to configure PIO used as i2c irq Bo Shen
2012-10-15 5:57 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-15 8:07 ` Nicolas Ferre
2012-10-19 6:56 ` Bo Shen [this message]
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