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Date:   Tue, 5 May 2020 12:16:02 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Robert Foss <robert.foss@...aro.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@....fi>,
        Maxime Ripard <maxime@...no.tech>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Dongchun Zhu <dongchun.zhu@...iatek.com>,
        Fabio Estevam <festevam@...il.com>,
        Tomasz Figa <tfiga@...omium.org>, Ben Kao <ben.kao@...el.com>
Subject: Re: [PATCH v7 2/3] media: ov8856: Add devicetree support

Hi Robert,

On 20-05-05 12:01, Robert Foss wrote:
> Add match table, enable ov8856_probe() to support
> both ACPI and DT modes.
> 
> ACPI and DT modes are primarily distinguished from
> by checking for ACPI mode and by having resource like
> be NULL.
> 
> Signed-off-by: Robert Foss <robert.foss@...aro.org>
> ---
> 
> - Changes since v6:
>   * Marco: Bail out of __ov8856_power_on earlier if ACPI mode
> 
> - Changes since v5:
>   * Maxime & Sakari: Replaced clock tolerance check with warning
> 
> - Changes since v4:
>   * Maxime & Sakari: Switch to clock-frequency
> 
> - Changes since v3:
>   * Remove redundant {}-brackets
>   * Compare xvclk_rate to 5% tolerance
>   * Andy: Use dev_fwnode()
>   * Andy: Use %pe instead of %ld + PTR_ERR()
>   * Andy: Invert reset_gpio logic
>   * Andy: Remove dev_dbg() from failing reset_gpio setup
>   * Andy: Use dev_err for logging for failures
>   * Andy: Remove dev_warn from EDEFER/regulator error path
>   * Andy & Sakari: Replaced GPIOD_OUT_XXX with 0/1
>   * Maxime & Sakari: Verify clock frequency from DT
>   * Sakari: Verify the 'xvclk_rate' is set correctly for ACPI/DT devices
>   * Sakari: Remove duplicate ov8856->dev assignment
> 
> - Changes since v2:
>   * Added "struct device *dev" member to struct ov8856
>   * Andy: Switch to optional version of devm_gpiod_get
>   * Andy: Switch to optional version of devm_clk_get
>   * Fabio: Add reset sleep period
>   * Sakari: Unify defines for 19.2Mhz
>   * Sakari: Remove 24Mhz clock, since it isn't needed for supported modes
>   * Sakari: Replace dev_info() with dev_dbg()
>   * Sakari: Switch induction variable type to unsigned
>   * Sakari: Don't wait for reset_gpio when in ACPI mode
>   * Sakari: Pull reset GPIO high on power on failure
>   * Sakari: Add power on/off to resume/suspend
>   * Sakari: Fix indentation
>   * Sakari: Power off during ov8856_remove()
>   * Sakari: Don't sleep during power-on in ACPI mode
>   * Sakari: Switch to getting xvclk from clk_get_rate
> 
> - Changes since v1:
>   * Andy & Sakari: Make XVCLK optional since to not break ACPI
>   * Fabio: Change n_shutdown_gpio name to reset_gpio
>   * Fabio: Invert reset_gpio due to GPIO_ACTIVE_HIGH -> GPIO_ACTIVE_LOW change
>   * Fabio: Remove empty line
>   * Fabio: Remove real error from devm_gpiod_get() failures
>   * Sakari: ARRAY_SIZE() directly instead of through OV8856_NUM_SUPPLIES
>   * Sakari: Use XVCLK rate as provided by DT
> 
>  drivers/media/i2c/ov8856.c | 137 +++++++++++++++++++++++++++++++++----
>  1 file changed, 123 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
> index 8655842af275..e6418a79801e 100644
> --- a/drivers/media/i2c/ov8856.c
> +++ b/drivers/media/i2c/ov8856.c
> @@ -3,10 +3,13 @@
>  
>  #include <asm/unaligned.h>
>  #include <linux/acpi.h>
> +#include <linux/clk.h>
>  #include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
>  #include <linux/i2c.h>
>  #include <linux/module.h>
>  #include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
>  #include <media/v4l2-ctrls.h>
>  #include <media/v4l2-device.h>
>  #include <media/v4l2-fwnode.h>
> @@ -18,7 +21,7 @@
>  #define OV8856_LINK_FREQ_360MHZ		360000000ULL
>  #define OV8856_LINK_FREQ_180MHZ		180000000ULL
>  #define OV8856_SCLK			144000000ULL
> -#define OV8856_MCLK			19200000
> +#define OV8856_XVCLK_19_2		19200000
>  #define OV8856_DATA_LANES		4
>  #define OV8856_RGB_DEPTH		10
>  
> @@ -64,6 +67,12 @@
>  
>  #define to_ov8856(_sd)			container_of(_sd, struct ov8856, sd)
>  
> +static const char * const ov8856_supply_names[] = {
> +	"dovdd",	/* Digital I/O power */
> +	"avdd",		/* Analog power */
> +	"dvdd",		/* Digital core power */
> +};
> +
>  enum {
>  	OV8856_LINK_FREQ_720MBPS,
>  	OV8856_LINK_FREQ_360MBPS,
> @@ -566,6 +575,11 @@ struct ov8856 {
>  	struct media_pad pad;
>  	struct v4l2_ctrl_handler ctrl_handler;
>  
> +	struct device		*dev;

Why do we need this reference here? We already have all information we
need to retrieve the device.

> +	struct clk		*xvclk;
> +	struct gpio_desc	*reset_gpio;
> +	struct regulator_bulk_data supplies[ARRAY_SIZE(ov8856_supply_names)];
> +
>  	/* V4L2 Controls */
>  	struct v4l2_ctrl *link_freq;
>  	struct v4l2_ctrl *pixel_rate;
> @@ -908,6 +922,52 @@ static int ov8856_set_stream(struct v4l2_subdev *sd, int enable)
>  	return ret;
>  }
>  
> +static int __ov8856_power_on(struct ov8856 *ov8856)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
> +	int ret;
> +
> +	if (is_acpi_node(dev_fwnode(ov8856->dev)))
> +		return 0;
> +
> +	ret = clk_prepare_enable(ov8856->xvclk);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "failed to enable xvclk\n");
> +		return ret;
> +	}
> +
> +	if (ov8856->reset_gpio) {
> +		gpiod_set_value_cansleep(ov8856->reset_gpio, 1);
> +		usleep_range(1000, 2000);
> +	}
> +
> +	ret = regulator_bulk_enable(ARRAY_SIZE(ov8856_supply_names),
> +				    ov8856->supplies);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "failed to enable regulators\n");
> +		goto disable_clk;
> +	}
> +
> +	gpiod_set_value_cansleep(ov8856->reset_gpio, 0);
> +	usleep_range(1500, 1800);
> +
> +	return 0;
> +
> +disable_clk:
> +	gpiod_set_value_cansleep(ov8856->reset_gpio, 1);
> +	clk_disable_unprepare(ov8856->xvclk);
> +
> +	return ret;
> +}
> +
> +static void __ov8856_power_off(struct ov8856 *ov8856)
> +{
> +	gpiod_set_value_cansleep(ov8856->reset_gpio, 1);
> +	regulator_bulk_disable(ARRAY_SIZE(ov8856_supply_names),
> +			       ov8856->supplies);

In case of ACPI this will still be a unbalanced regulator. Albeit it is a
dummy_regulator it will produce warnings in the ACPI case. Therefore I
said to add the check:

if (is_acpi_node(dev_fwnode(ov8856->dev)))
	return 0;

here to at the begin of this function.


> +	clk_disable_unprepare(ov8856->xvclk);
> +}
> +
>  static int __maybe_unused ov8856_suspend(struct device *dev)
>  {
>  	struct i2c_client *client = to_i2c_client(dev);
> @@ -918,6 +978,7 @@ static int __maybe_unused ov8856_suspend(struct device *dev)
>  	if (ov8856->streaming)
>  		ov8856_stop_streaming(ov8856);
>  
> +	__ov8856_power_off(ov8856);
>  	mutex_unlock(&ov8856->mutex);
>  
>  	return 0;
> @@ -931,6 +992,8 @@ static int __maybe_unused ov8856_resume(struct device *dev)
>  	int ret;
>  
>  	mutex_lock(&ov8856->mutex);
> +
> +	__ov8856_power_on(ov8856);
>  	if (ov8856->streaming) {
>  		ret = ov8856_start_streaming(ov8856);
>  		if (ret) {
> @@ -1092,29 +1155,54 @@ static int ov8856_identify_module(struct ov8856 *ov8856)
>  	return 0;
>  }
>  
> -static int ov8856_check_hwcfg(struct device *dev)
> +static int ov8856_get_hwcfg(struct ov8856 *ov8856)
>  {
> +	struct device *dev = ov8856->dev;
>  	struct fwnode_handle *ep;
>  	struct fwnode_handle *fwnode = dev_fwnode(dev);
>  	struct v4l2_fwnode_endpoint bus_cfg = {
>  		.bus_type = V4L2_MBUS_CSI2_DPHY
>  	};
> -	u32 mclk;
> +	u32 xvclk_rate;
>  	int ret;
>  	unsigned int i, j;
>  
>  	if (!fwnode)
>  		return -ENXIO;
>  
> -	ret = fwnode_property_read_u32(fwnode, "clock-frequency", &mclk);
> +	ret = fwnode_property_read_u32(fwnode, "clock-frequency",
> +		&xvclk_rate);
>  	if (ret)
>  		return ret;
>  
> -	if (mclk != OV8856_MCLK) {
> -		dev_err(dev, "external clock %d is not supported", mclk);
> -		return -EINVAL;
> +	if (!is_acpi_node(fwnode)) {
> +		ov8856->xvclk = devm_clk_get(dev, "xvclk");
> +		if (IS_ERR(ov8856->xvclk)) {
> +			dev_err(dev, "could not get xvclk clock (%pe)\n",
> +					ov8856->xvclk);

I tought I commented this to. Pls align it :)

Regards,
  Marco

> +			return PTR_ERR(ov8856->xvclk);
> +		}
> +
> +		clk_set_rate(ov8856->xvclk, xvclk_rate);
> +		xvclk_rate = clk_get_rate(ov8856->xvclk);
>  	}
>  
> +	if (xvclk_rate != OV8856_XVCLK_19_2)
> +		dev_warn(dev, "external clock rate %d is unsupported", xvclk_rate);
> +
> +	ov8856->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> +		GPIOD_OUT_LOW);
> +	if (IS_ERR(ov8856->reset_gpio))
> +		return PTR_ERR(ov8856->reset_gpio);
> +
> +	for (i = 0; i < ARRAY_SIZE(ov8856_supply_names); i++)
> +		ov8856->supplies[i].supply = ov8856_supply_names[i];
> +
> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ov8856_supply_names),
> +				      ov8856->supplies);
> +	if (ret)
> +		return ret;
> +
>  	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
>  	if (!ep)
>  		return -ENXIO;
> @@ -1169,6 +1257,8 @@ static int ov8856_remove(struct i2c_client *client)
>  	pm_runtime_disable(&client->dev);
>  	mutex_destroy(&ov8856->mutex);
>  
> +	__ov8856_power_off(ov8856);
> +
>  	return 0;
>  }
>  
> @@ -1177,22 +1267,31 @@ static int ov8856_probe(struct i2c_client *client)
>  	struct ov8856 *ov8856;
>  	int ret;
>  
> -	ret = ov8856_check_hwcfg(&client->dev);
> +	ov8856 = devm_kzalloc(&client->dev, sizeof(*ov8856), GFP_KERNEL);
> +	if (!ov8856)
> +		return -ENOMEM;
> +
> +	ov8856->dev = &client->dev;
> +
> +	ret = ov8856_get_hwcfg(ov8856);
>  	if (ret) {
> -		dev_err(&client->dev, "failed to check HW configuration: %d",
> +		dev_err(&client->dev, "failed to get HW configuration: %d",
>  			ret);
>  		return ret;
>  	}
>  
> -	ov8856 = devm_kzalloc(&client->dev, sizeof(*ov8856), GFP_KERNEL);
> -	if (!ov8856)
> -		return -ENOMEM;
> -
>  	v4l2_i2c_subdev_init(&ov8856->sd, client, &ov8856_subdev_ops);
> +
> +	ret = __ov8856_power_on(ov8856);
> +	if (ret) {
> +		dev_err(&client->dev, "failed to power on\n");
> +		return ret;
> +	}
> +
>  	ret = ov8856_identify_module(ov8856);
>  	if (ret) {
>  		dev_err(&client->dev, "failed to find sensor: %d", ret);
> -		return ret;
> +		goto probe_power_off;
>  	}
>  
>  	mutex_init(&ov8856->mutex);
> @@ -1238,6 +1337,9 @@ static int ov8856_probe(struct i2c_client *client)
>  	v4l2_ctrl_handler_free(ov8856->sd.ctrl_handler);
>  	mutex_destroy(&ov8856->mutex);
>  
> +probe_power_off:
> +	__ov8856_power_off(ov8856);
> +
>  	return ret;
>  }
>  
> @@ -1254,11 +1356,18 @@ static const struct acpi_device_id ov8856_acpi_ids[] = {
>  MODULE_DEVICE_TABLE(acpi, ov8856_acpi_ids);
>  #endif
>  
> +static const struct of_device_id ov8856_of_match[] = {
> +	{ .compatible = "ovti,ov8856" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, ov8856_of_match);
> +
>  static struct i2c_driver ov8856_i2c_driver = {
>  	.driver = {
>  		.name = "ov8856",
>  		.pm = &ov8856_pm_ops,
>  		.acpi_match_table = ACPI_PTR(ov8856_acpi_ids),
> +		.of_match_table = ov8856_of_match,
>  	},
>  	.probe_new = ov8856_probe,
>  	.remove = ov8856_remove,
> -- 
> 2.25.1
> 
> 

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