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Date: Wed, 29 Mar 2017 03:50:41 +0200 From: Linus Walleij <linus.walleij@...aro.org> To: Nandor Han <nandor.han@...com> Cc: Alexandre Courbot <gnurou@...il.com>, Rob Herring <robh+dt@...nel.org>, Mark Rutland <mark.rutland@....com>, "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 0/3] XRA1403,gpio - add XRA1403 gpio expander driver On Mon, Mar 27, 2017 at 8:22 AM, Nandor Han <nandor.han@...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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