From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1751476AbdC2Buq (ORCPT <rfc822;w@1wt.eu>);
        Tue, 28 Mar 2017 21:50:46 -0400
Received: from mail-it0-f54.google.com ([209.85.214.54]:36597 "EHLO
        mail-it0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1751194AbdC2Buo (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Tue, 28 Mar 2017 21:50:44 -0400
MIME-Version: 1.0
In-Reply-To: <cover.1490595641.git.nandor.han@ge.com>
References: <cover.1490595641.git.nandor.han@ge.com>
From: Linus Walleij <linus.walleij@linaro.org>
Date: Wed, 29 Mar 2017 03:50:41 +0200
Message-ID: <CACRpkdZ-wD5SwBNtSPceV-mwJiAAU_03obk3Gv97kz0MzX7RLw@mail.gmail.com>
Subject: Re: [PATCH 0/3] XRA1403,gpio - add XRA1403 gpio expander driver
To: Nandor Han <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" <linux-gpio@vger.kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset=UTF-8
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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