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Re: [PATCH 0/3] XRA1403,gpio - add XRA1403 gpio expander driver

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  Re: [PATCH 0/3] XRA1403,gpio - add XRA1403 gpio expander driver Linus Walleij <linus.walleij@linaro.org> - 2017-03-29 04:00 +0200
    [PATCH 0/3] XRA1403,gpio - add XRA1403 gpio expander driver "Han, Nandor (GE Healthcare)" <nandor.han@ge.com> - 2017-04-05 15:00 +0200

#1611492 — Re: [PATCH 0/3] XRA1403,gpio - add XRA1403 gpio expander driver

On Mon, Mar 27, 2017 at 8:22 AM, Nandor Han <nandor.han@ge.com> wrote:

> Testing:
>
> 1. XRA1403 connected to iMX53 MCU
> 2. Export gpio from userspace
> 3. Verify that corresponding gpio directories are created
>    in `/sys/class/gpio/gpioXX`
> 4. Export gpios from first and second bank as output
> 5. Set the output gpio pin to high/low and verify with the
>    oscilloscope that gpio status is according with the configured
>    value.

Do *NOT* use the sysfs for testing GPIO.
This is being phased out.

Use the tools in tools/gpio/* so that you exercise the
character device instead of the old deprecated ABI.

Yours,
Linus Walleij

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#1616905

> -----Original Message-----
> From: Linus Walleij [mailto:linus.walleij@linaro.org]
> Sent: 29 March 2017 04:51
> To: Han, Nandor (GE Healthcare) <nandor.han@ge.com>
> Cc: Alexandre Courbot <gnurou@gmail.com>; Rob Herring <robh+dt@kernel.org>; Mark Rutland
> <mark.rutland@arm.com>; linux-gpio@vger.kernel.org; devicetree@vger.kernel.org; linux-kernel@vger.kernel.org
> Subject: EXT: Re: [PATCH 0/3] XRA1403,gpio - add XRA1403 gpio expander driver
> 

<snip>

> Do *NOT* use the sysfs for testing GPIO.
> This is being phased out.
> 
> Use the tools in tools/gpio/* so that you exercise the
> character device instead of the old deprecated ABI.
> 

Thanks Linus, really good and  helpful comments.
I agree that make more sense to test with tools/gpio/*.

> Yours,
> Linus Walleij

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