[Xenomai] GPIO in Xenomai

[Xenomai] GPIO in Xenomai

[Stefan Roese]

Hi,

I'm looking for a way to use the SoC GPIO's (MPC5200) in an RT thread.
Accessing them via the sysfs (the Linux userspace way) is not an option
since we need to access the GPIO's at a quite high frequency.

How could the Linux gpiolib infrastructure best be exposed to RT
threads? Has this been discussed before? Any ideas about the "best"
approach here?

Thanks,
Stefan

Re: [Xenomai] GPIO in Xenomai

[Roland Stigge]

On 11/28/2012 08:12 AM, Stefan Roese wrote:
> I'm looking for a way to use the SoC GPIO's (MPC5200) in an RT thread.
> Accessing them via the sysfs (the Linux userspace way) is not an option
> since we need to access the GPIO's at a quite high frequency.
> 
> How could the Linux gpiolib infrastructure best be exposed to RT
> threads? Has this been discussed before? Any ideas about the "best"
> approach here?

Have you seen my block gpio patches (v7) that I posted recently to the
kernel list? It now contains a dev interface - much faster than sysfs,
and can operate on several GPIOs at once.

I can re-post here if it helps.

Thanks,

Roland

Re: [Xenomai] GPIO in Xenomai

[Stefan Roese]

On 11/28/2012 09:44 AM, Roland Stigge wrote:
> On 11/28/2012 08:12 AM, Stefan Roese wrote:
>> I'm looking for a way to use the SoC GPIO's (MPC5200) in an RT thread.
>> Accessing them via the sysfs (the Linux userspace way) is not an option
>> since we need to access the GPIO's at a quite high frequency.
>>
>> How could the Linux gpiolib infrastructure best be exposed to RT
>> threads? Has this been discussed before? Any ideas about the "best"
>> approach here?
> 
> Have you seen my block gpio patches (v7) that I posted recently to the
> kernel list? It now contains a dev interface - much faster than sysfs,
> and can operate on several GPIOs at once.
> 
> I can re-post here if it helps.

No, I haven't seen those patches. Could you please post a link to those
patches (re-posting here is not necessary).

Thanks,
Stefan

Re: [Xenomai] GPIO in Xenomai

[Roland Stigge]

On 11/28/2012 09:48 AM, Stefan Roese wrote:
>> Have you seen my block gpio patches (v7) that I posted recently to the
>> kernel list? It now contains a dev interface - much faster than sysfs,
>> and can operate on several GPIOs at once.
>>
>> I can re-post here if it helps.
> 
> No, I haven't seen those patches. Could you please post a link to those
> patches (re-posting here is not necessary).

Please consider:

http://lwn.net/Articles/525558/

As mbox at:

http://download.gmane.org/gmane.linux.kernel/1395900/1395906

Please tell if any questions arise.

Roland