linux-kernel - Re: [PATCH 1/2] media: i2c: Add GC08A3 image sensor driver

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Message-ID: <1d58c2b9-4206-409c-b312-87f4fb649512@linaro.org>
Date:   Thu, 7 Dec 2023 09:18:20 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Zhi Mao <zhi.mao@...iatek.com>, mchehab@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org
Cc:     shengnan.wang@...iatek.com, yaya.chang@...iatek.com,
        10572168@...com, Project_Global_Chrome_Upstream_Group@...iatek.com,
        yunkec@...omium.org, conor+dt@...nel.org, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com,
        jacopo.mondi@...asonboard.com, sakari.ailus@...ux.intel.com,
        hverkuil-cisco@...all.nl, heiko@...ech.de,
        jernej.skrabec@...il.com, macromorgan@...mail.com,
        linus.walleij@...aro.org, laurent.pinchart@...asonboard.com,
        hdegoede@...hat.com, tomi.valkeinen@...asonboard.com,
        gerald.loacker@...fvision.net, andy.shevchenko@...il.com,
        bingbu.cao@...el.com, dan.scally@...asonboard.com,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/2] media: i2c: Add GC08A3 image sensor driver

On 07/12/2023 06:20, Zhi Mao wrote:
> Add a V4L2 sub-device driver for Galaxycore GC08A3 image sensor.
> 
> Reviewed-By: yunkec@...omium.org

I don't see review given here:

https://lore.kernel.org/linux-media/20231123115104.32094-1-zhi.mao@mediatek.com/

This does not look like real review. Where was it performed? How
thorough was it? How many review iterations did it include?  Why there
is no name but anonymous review?



> Signed-off-by: Zhi Mao <zhi.mao@...iatek.com>
> ---
>  drivers/media/i2c/Kconfig  |   14 +
>  drivers/media/i2c/Makefile |    1 +
>  drivers/media/i2c/gc08a3.c | 1888 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 1903 insertions(+)
>  create mode 100644 drivers/media/i2c/gc08a3.c
> 

...

> +static inline struct gc08a3 *to_gc08a3(struct v4l2_subdev *sd)
> +{
> +	return container_of(sd, struct gc08a3, sd);
> +}
> +
> +static int gc08a3_power_on(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct gc08a3 *gc08a3 = to_gc08a3(sd);
> +	int ret;
> +
> +	gpiod_set_value_cansleep(gc08a3->enable_gpio, 0);

Why do you put make enable GPIO low? That's not how enable GPIO is
supposed to work...

> +	usleep_range(GC08A3_MIN_SLEEP_US, GC08A3_MAX_SLEEP_US);
> +
> +	ret = regulator_bulk_enable(GC08A3_NUM_SUPPLIES, gc08a3->supplies);
> +	if (ret < 0) {
> +		dev_err(gc08a3->dev, "failed to enable regulators: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(gc08a3->xclk);
> +	if (ret < 0) {
> +		regulator_bulk_disable(GC08A3_NUM_SUPPLIES, gc08a3->supplies);
> +		dev_err(gc08a3->dev, "clk prepare enable failed\n");
> +		return ret;
> +	}
> +
> +	usleep_range(GC08A3_MIN_SLEEP_US, GC08A3_MAX_SLEEP_US);
> +
> +	gpiod_set_value_cansleep(gc08a3->enable_gpio, 1);
> +	usleep_range(GC08A3_MIN_SLEEP_US, GC08A3_MAX_SLEEP_US);
> +
> +	return 0;
> +}
> +
> +static int gc08a3_power_off(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct gc08a3 *gc08a3 = to_gc08a3(sd);
> +
> +	gpiod_set_value_cansleep(gc08a3->enable_gpio, 0);

How making enable GPIO low is related to power off? Enable means you
turn on some feature, not shutdown. Look at common GPIO consumer
bindings in the kernel.


...

> +static int gc08a3_probe(struct i2c_client *client)
> +{
> +	struct device *dev = &client->dev;
> +	struct gc08a3 *gc08a3;
> +	int ret;
> +
> +	ret = gc08a3_parse_fwnode(dev);
> +	if (ret)
> +		return ret;
> +
> +	gc08a3 = devm_kzalloc(dev, sizeof(*gc08a3), GFP_KERNEL);
> +	if (!gc08a3)
> +		return -ENOMEM;
> +
> +	gc08a3->dev = dev;
> +
> +	gc08a3->xclk = devm_clk_get(dev, NULL);
> +	if (IS_ERR(gc08a3->xclk))
> +		return dev_err_probe(dev, PTR_ERR(gc08a3->xclk),
> +					 "failed to get xclk\n");

Misaligned indentation

> +
> +	ret = clk_set_rate(gc08a3->xclk, GC08A3_DEFAULT_CLK_FREQ);
> +	if (ret)
> +		return dev_err_probe(dev, ret,
> +					 "failed to set xclk frequency\n");

Misaligned indentation

> +
> +	ret = gc08a3_get_regulators(dev, gc08a3);
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret,
> +					 "failed to get regulators\n");

Misaligned indentation

> +
> +	gc08a3->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
> +	if (IS_ERR(gc08a3->enable_gpio))
> +		return dev_err_probe(dev, PTR_ERR(gc08a3->enable_gpio),
> +					 "failed to get gpio\n");

Misaligned indentation... probably entire code is misaligned.


Best regards,
Krzysztof