Re: [v1 2/3] media: ov8856: Add devicetree support

From: Fabio Estevam <festevam@gmail.com>
To: Robert Foss <robert.foss@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@vger.kernel.org>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Tomasz Figa <tfiga@chromium.org>,
	ben.kao@intel.com, Rob Herring <robh+dt@kernel.org>,
	linux-mediatek@lists.infradead.org,
	Dongchun Zhu <dongchun.zhu@mediatek.com>,
	Jonathan.Cameron@huawei.com,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
	<linux-arm-kernel@lists.infradead.org>,
	linux-media <linux-media@vger.kernel.org>
Subject: Re: [v1 2/3] media: ov8856: Add devicetree support
Date: Tue, 10 Mar 2020 11:03:21 -0300	[thread overview]
Message-ID: <CAOMZO5D7N6FfPMiycGun-eui-G-tbp15stwRWBWs4L98JHFfGA@mail.gmail.com> (raw)
In-Reply-To: <20200310134603.30260-3-robert.foss@linaro.org>

On Tue, Mar 10, 2020 at 10:47 AM Robert Foss <robert.foss@linaro.org> wrote:

> +static int __ov8856_power_on(struct ov8856 *ov8856)
> +{
> +       struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
> +       int ret;
> +
> +       ret = clk_prepare_enable(ov8856->xvclk);
> +       if (ret < 0) {
> +               dev_err(&client->dev, "failed to enable xvclk\n");
> +               return ret;
> +       }
> +
> +       gpiod_set_value_cansleep(ov8856->n_shutdn_gpio, GPIOD_OUT_LOW);
> +
> +       ret = regulator_bulk_enable(OV8856_NUM_SUPPLIES, ov8856->supplies);
> +       if (ret < 0) {
> +               dev_err(&client->dev, "failed to enable regulators\n");
> +               goto disable_clk;
> +       }
> +
> +       gpiod_set_value_cansleep(ov8856->n_shutdn_gpio, GPIOD_OUT_HIGH);

To power it up you probably only need:

gpiod_set_value_cansleep(ov8856->n_shutdn_gpio, 0);

And use reset-gpios as active low in your device tree. Assuming the
reset-gpios is active low like other OmniVision sensors.

> +
> +       usleep_range(1500, 1800);
> +
> +       return 0;
> +
> +disable_clk:
> +       clk_disable_unprepare(ov8856->xvclk);
> +
> +       return ret;
> +}
> +
> +static void __ov8856_power_off(struct ov8856 *ov8856)
> +{
> +       gpiod_set_value_cansleep(ov8856->n_shutdn_gpio, GPIOD_OUT_LOW);
> +       regulator_bulk_disable(OV8856_NUM_SUPPLIES, ov8856->supplies);
> +       clk_disable_unprepare(ov8856->xvclk);
> +}
> +
> +

Unneede extra blank line.

>         v4l2_i2c_subdev_init(&ov8856->sd, client, &ov8856_subdev_ops);
> +       ov8856->xvclk = devm_clk_get(&client->dev, "xvclk");
> +       if (IS_ERR(ov8856->xvclk)) {
> +               dev_err(&client->dev, "failed to get xvclk\n");
> +               return -EINVAL;

You should better return the real error insteald
PTR_ERR(ov8856->xvclk). This way defer probe could work.

> +       }
> +
> +       ret = clk_set_rate(ov8856->xvclk, OV8856_XVCLK_24);
> +       if (ret < 0) {
> +               dev_err(&client->dev, "failed to set xvclk rate (24MHz)\n");
> +               return ret;
> +       }
> +
> +       ov8856->n_shutdn_gpio = devm_gpiod_get(&client->dev, "reset",
> +                                              GPIOD_OUT_LOW);
> +       if (IS_ERR(ov8856->n_shutdn_gpio)) {
> +               dev_err(&client->dev, "failed to get reset-gpios\n");
> +               return -EINVAL;

Please return the real error.

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