linux-kernel - Re: [PATCH v2 9/9] media: i2c: tw9910: Remove soc

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Message-ID: <CAOMZO5CjrXfzum7JgimGqvnM7kjMyZZdtpEhvYwO-DLnig=uMQ@mail.gmail.com>
Date:   Wed, 3 Jan 2018 14:41:20 -0200
From:   Fabio Estevam <festevam@...il.com>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Magnus Damm <magnus.damm@...il.com>, geert@...der.be,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-renesas-soc@...r.kernel.org,
        linux-media <linux-media@...r.kernel.org>,
        linux-sh@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 9/9] media: i2c: tw9910: Remove soc_camera dependencies

Hi Jacopo,

On Thu, Dec 28, 2017 at 12:01 PM, Jacopo Mondi
<jacopo+renesas@...ndi.org> wrote:

> +       if (priv->rstb_gpio) {
> +               gpiod_set_value(priv->rstb_gpio, 0);
> +               usleep_range(500, 1000);
> +               gpiod_set_value(priv->rstb_gpio, 1);
> +               usleep_range(500, 1000);

This seems to be inverted.

Consider you have an active low GPIO reset.

In order to reset it:

Put the GPIO to logic level 0
Wait some time
Put the GPIO to logic level 1

gpiod_set_value(priv->rstb_gpio, 1), means the GPIO in the active
state (0 in this example).

, so this should be:

gpiod_set_value(priv->rstb_gpio, 1);
usleep_range(500, 1000);
gpiod_set_value(priv->rstb_gpio, 0);