[PATCH] media: i2c/adp1653: devicetree support for adp1653

[PATCH] media: i2c/adp1653: devicetree support for adp1653

[Pavel Machek]

We are moving to device tree support on OMAP3, but that currently
breaks ADP1653 driver. This adds device tree support, plus required
documentation.

Signed-off-by: Pavel Machek <pavel@ucw.cz>

--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
@@ -0,0 +1,38 @@
+* Analog Devices ADP1653 flash LED driver
+
+Required Properties:
+
+  - compatible: Must contain one of the following
+    - "adi,adp1653"
+
+  - reg: I2C slave address
+
+  - gpios: References to the GPIO that controls the power for the chip.
+
+There are two led outputs available - flash and indicator. One led is
+represented by one child node, nodes need to be named "flash" and "indicator".
+
+Required properties of the LED child node:
+- max-microamp : see Documentation/devicetree/bindings/leds/common.txt
+
+Required properties of the flash LED child node:
+
+- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
+- flash-timeout-microsec : see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+        adp1653: led-controller@30 {
+                compatible = "adi,adp1653";
+		reg = <0x30>;
+                gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
+
+		flash {
+                        flash-timeout-microsec = <500000>;
+                        flash-max-microamp = <320000>;
+                        max-microamp = <50000>;
+		};
+                indicator {
+                        max-microamp = <17500>;
+		};
+        };
diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
index cfddc3d..11d8afd 100644
--- a/arch/arm/boot/dts/omap3-n900.dts
+++ b/arch/arm/boot/dts/omap3-n900.dts
@@ -560,6 +567,22 @@
 
 		ti,usb-charger-detection = <&isp1704>;
 	};
+
+	adp1653: led-controller@30 {
+		compatible = "adi,adp1653";
+		reg = <0x30>;
+		gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
+
+		flash {
+			flash-timeout-microsec = <500000>;
+			flash-max-microamp = <320000>;
+			max-microamp = <50000>;
+		};
+
+		indicator {
+			max-microamp = <17500>;
+		};
+	};
 };
 
 &i2c3 {
diff --git a/drivers/media/i2c/adp1653.c b/drivers/media/i2c/adp1653.c
index 873fe19..62601b2 100644
--- a/drivers/media/i2c/adp1653.c
+++ b/drivers/media/i2c/adp1653.c
@@ -8,6 +8,7 @@
  * Contributors:
  *	Sakari Ailus <sakari.ailus@iki.fi>
  *	Tuukka Toivonen <tuukkat76@gmail.com>
+ *      Pavel Machek <pavel@ucw.cz>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -34,9 +35,11 @@
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio.h>
 #include <media/adp1653.h>
 #include <media/v4l2-device.h>
 
 #define TIMEOUT_MAX		820000
 #define TIMEOUT_STEP		54600
 #define TIMEOUT_MIN		(TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \
@@ -306,9 +318,18 @@ adp1653_init_device(struct adp1653_flash *flash)
 static int
 __adp1653_set_power(struct adp1653_flash *flash, int on)
 {
-	int ret;
+	int ret = 0;
 
-	ret = flash->platform_data->power(&flash->subdev, on);
+	if (flash->platform_data->power)
+		ret = flash->platform_data->power(&flash->subdev, on);
+	else {
+		gpio_set_value(flash->platform_data->power_gpio, on);
+		if (on) {
+			/* Some delay is apparently required. */
+			udelay(20);
+		}
+	}
+			
 	if (ret < 0)
 		return ret;
 
@@ -316,8 +337,13 @@ __adp1653_set_power(struct adp1653_flash *flash, int on)
 		return 0;
 
 	ret = adp1653_init_device(flash);
-	if (ret < 0)
+	if (ret >= 0)
+		return ret;
+
+	if (flash->platform_data->power)
 		flash->platform_data->power(&flash->subdev, 0);
+	else
+		gpio_set_value(flash->platform_data->power_gpio, 0);
 
 	return ret;
 }
@@ -407,21 +433,69 @@ static int adp1653_resume(struct device *dev)
 
 #endif /* CONFIG_PM */
 
+static int adp1653_of_init(struct i2c_client *client, struct adp1653_flash *flash, 
+			   struct device_node *node)
+{
+	u32 val;
+	struct adp1653_platform_data *pd;
+	enum of_gpio_flags flags;
+	int gpio;
+	struct device_node *child;
+
+	if (!node)
+		return -EINVAL;
+
+	pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL);
+	if (!pd)
+		return -ENOMEM;
+	flash->platform_data = pd;
+
+	child = of_get_child_by_name(node, "flash");
+	if (!child) return -EINVAL;
+	if (of_property_read_u32(child, "flash-timeout-microsec", &val)) return -EINVAL;
+	pd->max_flash_timeout = val;
+	if (of_property_read_u32(child, "flash-max-microamp", &val)) return -EINVAL;
+	pd->max_flash_intensity = val/1000;
+	if (of_property_read_u32(child, "max-microamp", &val)) return -EINVAL;
+	pd->max_torch_intensity = val/1000;
+
+	child = of_get_child_by_name(node, "indicator");
+	if (!child) return -EINVAL;
+	if (of_property_read_u32(child, "max-microamp", &val)) return -EINVAL;
+	pd->max_indicator_intensity = val;
+
+	if (!of_find_property(node, "gpios", NULL)) {
+		dev_err(&client->dev, "No gpio node\n");
+		return -EINVAL;
+	}
+
+	gpio = of_get_gpio_flags(node, 0, &flags);
+	if (gpio < 0) {
+		dev_err(&client->dev, "Error getting GPIO\n"); 
+		return -EINVAL;
+	}
+
+	pd->power_gpio = gpio;
+	return 0;
+}
+
+
 static int adp1653_probe(struct i2c_client *client,
 			 const struct i2c_device_id *devid)
 {
 	struct adp1653_flash *flash;
 	int ret;
 
-	/* we couldn't work without platform data */
-	if (client->dev.platform_data == NULL)
-		return -ENODEV;
-
 	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
 	if (flash == NULL)
 		return -ENOMEM;
 
 	flash->platform_data = client->dev.platform_data;
+	if (!flash->platform_data) {
+		ret = adp1653_of_init(client, flash, client->dev.of_node);
+		if (ret)
+			return ret;
+	}
 
 	mutex_init(&flash->power_lock);
 
diff --git a/include/media/adp1653.h b/include/media/adp1653.h
index 1d9b48a..b556580 100644
--- a/include/media/adp1653.h
+++ b/include/media/adp1653.h
@@ -100,9 +100,11 @@ struct adp1653_platform_data {
 	int (*power)(struct v4l2_subdev *sd, int on);
 
 	u32 max_flash_timeout;		/* flash light timeout in us */
-	u32 max_flash_intensity;	/* led intensity, flash mode */
-	u32 max_torch_intensity;	/* led intensity, torch mode */
-	u32 max_indicator_intensity;	/* indicator led intensity */
+	u32 max_flash_intensity;	/* led intensity, flash mode, mA */
+	u32 max_torch_intensity;	/* led intensity, torch mode, mA */
+	u32 max_indicator_intensity;	/* indicator led intensity, uA */
+
+	int power_gpio;			/* for device-tree based boot */
 };
 
 #define to_adp1653_flash(sd)	container_of(sd, struct adp1653_flash, subdev)

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: [PATCH] media: i2c/adp1653: devicetree support for adp1653

[Mauro Carvalho Chehab]

Em Wed, 3 Dec 2014 22:46:41 +0100
Pavel Machek <pavel@ucw.cz> escreveu:

> 
> We are moving to device tree support on OMAP3, but that currently
> breaks ADP1653 driver. This adds device tree support, plus required
> documentation.
> 
> Signed-off-by: Pavel Machek <pavel@ucw.cz>

Please be sure to check your patch with checkpatch. There are several
issues on it:

WARNING: DT compatible string "adi,adp1653" appears un-documented -- check ./Documentation/devicetree/bindings/
#78: FILE: arch/arm/boot/dts/omap3-n900.dts:572:
+		compatible = "adi,adp1653";

ERROR: trailing whitespace
#136: FILE: drivers/media/i2c/adp1653.c:332:
+^I^I^I$

ERROR: trailing whitespace
#159: FILE: drivers/media/i2c/adp1653.c:436:
+static int adp1653_of_init(struct i2c_client *client, struct adp1653_flash *flash, $

WARNING: line over 80 characters
#159: FILE: drivers/media/i2c/adp1653.c:436:
+static int adp1653_of_init(struct i2c_client *client, struct adp1653_flash *flash, 

ERROR: trailing statements should be on next line
#177: FILE: drivers/media/i2c/adp1653.c:454:
+	if (!child) return -EINVAL;

WARNING: line over 80 characters
#178: FILE: drivers/media/i2c/adp1653.c:455:
+	if (of_property_read_u32(child, "flash-timeout-microsec", &val)) return -EINVAL;

ERROR: trailing statements should be on next line
#178: FILE: drivers/media/i2c/adp1653.c:455:
+	if (of_property_read_u32(child, "flash-timeout-microsec", &val)) return -EINVAL;

WARNING: line over 80 characters
#180: FILE: drivers/media/i2c/adp1653.c:457:
+	if (of_property_read_u32(child, "flash-max-microamp", &val)) return -EINVAL;

ERROR: trailing statements should be on next line
#180: FILE: drivers/media/i2c/adp1653.c:457:
+	if (of_property_read_u32(child, "flash-max-microamp", &val)) return -EINVAL;

ERROR: trailing statements should be on next line
#182: FILE: drivers/media/i2c/adp1653.c:459:
+	if (of_property_read_u32(child, "max-microamp", &val)) return -EINVAL;

ERROR: trailing statements should be on next line
#186: FILE: drivers/media/i2c/adp1653.c:463:
+	if (!child) return -EINVAL;

ERROR: trailing statements should be on next line
#187: FILE: drivers/media/i2c/adp1653.c:464:
+	if (of_property_read_u32(child, "max-microamp", &val)) return -EINVAL;

ERROR: trailing whitespace
#197: FILE: drivers/media/i2c/adp1653.c:474:
+^I^Idev_err(&client->dev, "Error getting GPIO\n"); $

total: 9 errors, 4 warnings, 199 lines checked

NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or
      scripts/cleanfile

> 
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
> @@ -0,0 +1,38 @@
> +* Analog Devices ADP1653 flash LED driver
> +
> +Required Properties:
> +
> +  - compatible: Must contain one of the following
> +    - "adi,adp1653"
> +
> +  - reg: I2C slave address
> +
> +  - gpios: References to the GPIO that controls the power for the chip.
> +
> +There are two led outputs available - flash and indicator. One led is
> +represented by one child node, nodes need to be named "flash" and "indicator".
> +
> +Required properties of the LED child node:
> +- max-microamp : see Documentation/devicetree/bindings/leds/common.txt
> +
> +Required properties of the flash LED child node:
> +
> +- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
> +- flash-timeout-microsec : see Documentation/devicetree/bindings/leds/common.txt
> +
> +Example:
> +
> +        adp1653: led-controller@30 {
> +                compatible = "adi,adp1653";
> +		reg = <0x30>;
> +                gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
> +
> +		flash {
> +                        flash-timeout-microsec = <500000>;
> +                        flash-max-microamp = <320000>;
> +                        max-microamp = <50000>;
> +		};
> +                indicator {
> +                        max-microamp = <17500>;
> +		};
> +        };
> diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
> index cfddc3d..11d8afd 100644
> --- a/arch/arm/boot/dts/omap3-n900.dts
> +++ b/arch/arm/boot/dts/omap3-n900.dts
> @@ -560,6 +567,22 @@
>  
>  		ti,usb-charger-detection = <&isp1704>;
>  	};
> +
> +	adp1653: led-controller@30 {
> +		compatible = "adi,adp1653";
> +		reg = <0x30>;
> +		gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
> +
> +		flash {
> +			flash-timeout-microsec = <500000>;
> +			flash-max-microamp = <320000>;
> +			max-microamp = <50000>;
> +		};
> +
> +		indicator {
> +			max-microamp = <17500>;
> +		};
> +	};
>  };
>  
>  &i2c3 {
> diff --git a/drivers/media/i2c/adp1653.c b/drivers/media/i2c/adp1653.c
> index 873fe19..62601b2 100644
> --- a/drivers/media/i2c/adp1653.c
> +++ b/drivers/media/i2c/adp1653.c
> @@ -8,6 +8,7 @@
>   * Contributors:
>   *	Sakari Ailus <sakari.ailus@iki.fi>
>   *	Tuukka Toivonen <tuukkat76@gmail.com>
> + *      Pavel Machek <pavel@ucw.cz>
>   *
>   * This program is free software; you can redistribute it and/or
>   * modify it under the terms of the GNU General Public License
> @@ -34,9 +35,11 @@
>  #include <linux/module.h>
>  #include <linux/i2c.h>
>  #include <linux/slab.h>
> +#include <linux/of_gpio.h>
> +#include <linux/gpio.h>
>  #include <media/adp1653.h>
>  #include <media/v4l2-device.h>
>  
>  #define TIMEOUT_MAX		820000
>  #define TIMEOUT_STEP		54600
>  #define TIMEOUT_MIN		(TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \
> @@ -306,9 +318,18 @@ adp1653_init_device(struct adp1653_flash *flash)
>  static int
>  __adp1653_set_power(struct adp1653_flash *flash, int on)
>  {
> -	int ret;
> +	int ret = 0;
>  
> -	ret = flash->platform_data->power(&flash->subdev, on);
> +	if (flash->platform_data->power)
> +		ret = flash->platform_data->power(&flash->subdev, on);
> +	else {
> +		gpio_set_value(flash->platform_data->power_gpio, on);
> +		if (on) {
> +			/* Some delay is apparently required. */
> +			udelay(20);
> +		}
> +	}
> +			
>  	if (ret < 0)
>  		return ret;
>  
> @@ -316,8 +337,13 @@ __adp1653_set_power(struct adp1653_flash *flash, int on)
>  		return 0;
>  
>  	ret = adp1653_init_device(flash);
> -	if (ret < 0)
> +	if (ret >= 0)
> +		return ret;
> +
> +	if (flash->platform_data->power)
>  		flash->platform_data->power(&flash->subdev, 0);
> +	else
> +		gpio_set_value(flash->platform_data->power_gpio, 0);
>  
>  	return ret;
>  }
> @@ -407,21 +433,69 @@ static int adp1653_resume(struct device *dev)
>  
>  #endif /* CONFIG_PM */
>  
> +static int adp1653_of_init(struct i2c_client *client, struct adp1653_flash *flash, 
> +			   struct device_node *node)
> +{
> +	u32 val;
> +	struct adp1653_platform_data *pd;
> +	enum of_gpio_flags flags;
> +	int gpio;
> +	struct device_node *child;
> +
> +	if (!node)
> +		return -EINVAL;
> +
> +	pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL);
> +	if (!pd)
> +		return -ENOMEM;
> +	flash->platform_data = pd;
> +
> +	child = of_get_child_by_name(node, "flash");
> +	if (!child) return -EINVAL;

One statement per line, please. Same for other lines below.

> +	if (of_property_read_u32(child, "flash-timeout-microsec", &val)) return -EINVAL;
> +	pd->max_flash_timeout = val;
> +	if (of_property_read_u32(child, "flash-max-microamp", &val)) return -EINVAL;
> +	pd->max_flash_intensity = val/1000;
> +	if (of_property_read_u32(child, "max-microamp", &val)) return -EINVAL;
> +	pd->max_torch_intensity = val/1000;
> +
> +	child = of_get_child_by_name(node, "indicator");
> +	if (!child) return -EINVAL;
> +	if (of_property_read_u32(child, "max-microamp", &val)) return -EINVAL;
> +	pd->max_indicator_intensity = val;
> +
> +	if (!of_find_property(node, "gpios", NULL)) {
> +		dev_err(&client->dev, "No gpio node\n");
> +		return -EINVAL;
> +	}
> +
> +	gpio = of_get_gpio_flags(node, 0, &flags);
> +	if (gpio < 0) {
> +		dev_err(&client->dev, "Error getting GPIO\n"); 
> +		return -EINVAL;
> +	}
> +
> +	pd->power_gpio = gpio;
> +	return 0;
> +}
> +
> +
>  static int adp1653_probe(struct i2c_client *client,
>  			 const struct i2c_device_id *devid)
>  {
>  	struct adp1653_flash *flash;
>  	int ret;
>  
> -	/* we couldn't work without platform data */
> -	if (client->dev.platform_data == NULL)
> -		return -ENODEV;
> -
>  	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
>  	if (flash == NULL)
>  		return -ENOMEM;
>  
>  	flash->platform_data = client->dev.platform_data;
> +	if (!flash->platform_data) {
> +		ret = adp1653_of_init(client, flash, client->dev.of_node);
> +		if (ret)
> +			return ret;
> +	}
>  
>  	mutex_init(&flash->power_lock);
>  
> diff --git a/include/media/adp1653.h b/include/media/adp1653.h
> index 1d9b48a..b556580 100644
> --- a/include/media/adp1653.h
> +++ b/include/media/adp1653.h
> @@ -100,9 +100,11 @@ struct adp1653_platform_data {
>  	int (*power)(struct v4l2_subdev *sd, int on);
>  
>  	u32 max_flash_timeout;		/* flash light timeout in us */
> -	u32 max_flash_intensity;	/* led intensity, flash mode */
> -	u32 max_torch_intensity;	/* led intensity, torch mode */
> -	u32 max_indicator_intensity;	/* indicator led intensity */
> +	u32 max_flash_intensity;	/* led intensity, flash mode, mA */
> +	u32 max_torch_intensity;	/* led intensity, torch mode, mA */
> +	u32 max_indicator_intensity;	/* indicator led intensity, uA */
> +
> +	int power_gpio;			/* for device-tree based boot */
>  };
>  
>  #define to_adp1653_flash(sd)	container_of(sd, struct adp1653_flash, subdev)
> 


-- 

Cheers,
Mauro

Re: [PATCH] media: i2c/adp1653: devicetree support for adp1653

[Pavel Machek]

On Tue 2014-12-23 15:23:25, Mauro Carvalho Chehab wrote:
> Em Wed, 3 Dec 2014 22:46:41 +0100
> Pavel Machek <pavel@ucw.cz> escreveu:
> 
> > 
> > We are moving to device tree support on OMAP3, but that currently
> > breaks ADP1653 driver. This adds device tree support, plus required
> > documentation.
> > 
> > Signed-off-by: Pavel Machek <pavel@ucw.cz>
> 
> Please be sure to check your patch with checkpatch. There are several
> issues on it:

> WARNING: DT compatible string "adi,adp1653" appears un-documented -- check ./Documentation/devicetree/bindings/
> #78: FILE: arch/arm/boot/dts/omap3-n900.dts:572:
> +		compatible = "adi,adp1653";

Hmm. Take a look at part quoted below. Someone needs to fix
checkpatch. Ccing authors.

> ERROR: trailing whitespace
> WARNING: line over 80 characters

Will fix.

> ERROR: trailing statements should be on next line
> #177: FILE: drivers/media/i2c/adp1653.c:454:
> +	if (!child) return -EINVAL;

I actually did these on purporse... the function is trivial, and by
keeping returns on one line it fits into screen. I see you want it
fixed below, so I'll do that for next version.

								Pavel

> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
> > @@ -0,0 +1,38 @@
> > +* Analog Devices ADP1653 flash LED driver
> > +
> > +Required Properties:
> > +
> > +  - compatible: Must contain one of the following
> > +    - "adi,adp1653"
> > +
> > +  - reg: I2C slave address
> > +
> > +  - gpios: References to the GPIO that controls the power for the chip.
> > +
> > +There are two led outputs available - flash and indicator. One led is
> > +represented by one child node, nodes need to be named "flash" and "indicator".
> > +
> > +Required properties of the LED child node:
> > +- max-microamp : see Documentation/devicetree/bindings/leds/common.txt
> > +
> > +Required properties of the flash LED child node:
> > +
> > +- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
> > +- flash-timeout-microsec : see Documentation/devicetree/bindings/leds/common.txt
> > +
> > +Example:
> > +
> > +        adp1653: led-controller@30 {
> > +                compatible = "adi,adp1653";
> > +		reg = <0x30>;
> > +                gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
> > +
> > +		flash {
> > +                        flash-timeout-microsec = <500000>;
> > +                        flash-max-microamp = <320000>;
> > +                        max-microamp = <50000>;
> > +		};
> > +                indicator {
> > +                        max-microamp = <17500>;
> > +		};
> > +        };

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: [PATCH] media: i2c/adp1653: devicetree support for adp1653

[Pavel Machek]

On Tue 2014-12-23 21:49:04, Pavel Machek wrote:
> On Tue 2014-12-23 15:23:25, Mauro Carvalho Chehab wrote:
> > Em Wed, 3 Dec 2014 22:46:41 +0100
> > Pavel Machek <pavel@ucw.cz> escreveu:
> > 
> > > 
> > > We are moving to device tree support on OMAP3, but that currently
> > > breaks ADP1653 driver. This adds device tree support, plus required
> > > documentation.
> > > 
> > > Signed-off-by: Pavel Machek <pavel@ucw.cz>
> > 
> > Please be sure to check your patch with checkpatch. There are several
> > issues on it:

Ok, you should have fixed version in your inbox.

Happy holidays!
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

[PATCHv2] media: i2c/adp1653: devicetree support for adp1653

[Pavel Machek]

We are moving to device tree support on OMAP3, but that currently
breaks ADP1653 driver. This adds device tree support, plus required
documentation.

Signed-off-by: Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>

---

Changed -microsec to -us, as requested by devicetree people.

Fixed checkpatch issues.

diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
index 2d88816..2c6c7c5 100644
--- a/Documentation/devicetree/bindings/leds/common.txt
+++ b/Documentation/devicetree/bindings/leds/common.txt
@@ -14,6 +14,15 @@ Optional properties for child nodes:
      "ide-disk" - LED indicates disk activity
      "timer" - LED flashes at a fixed, configurable rate
 
+- max-microamp : maximum intensity in microamperes of the LED
+	         (torch LED for flash devices)
+- flash-max-microamp : maximum intensity in microamperes of the
+                       flash LED; it is mandatory if the LED should
+		       support the flash mode
+- flash-timeout-microsec : timeout in microseconds after which the flash
+                           LED is turned off
+
+
 Examples:
 
 system-status {
@@ -21,3 +30,10 @@ system-status {
 	linux,default-trigger = "heartbeat";
 	...
 };
+
+camera-flash {
+	label = "Flash";
+	max-microamp = <50000>;
+	flash-max-microamp = <320000>;
+	flash-timeout-microsec = <500000>;
+}
diff --git a/Documentation/devicetree/bindings/media/i2c/adp1653.txt b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
new file mode 100644
index 0000000..3c7065f
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
@@ -0,0 +1,38 @@
+* Analog Devices ADP1653 flash LED driver
+
+Required Properties:
+
+  - compatible: Must contain one of the following
+    - "adi,adp1653"
+
+  - reg: I2C slave address
+
+  - gpios: References to the GPIO that controls the power for the chip.
+
+There are two led outputs available - flash and indicator. One led is
+represented by one child node, nodes need to be named "flash" and "indicator".
+
+Required properties of the LED child node:
+- max-microamp : see Documentation/devicetree/bindings/leds/common.txt
+
+Required properties of the flash LED child node:
+
+- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
+- flash-timeout-us : see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+        adp1653: led-controller@30 {
+                compatible = "adi,adp1653";
+		reg = <0x30>;
+                gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
+
+		flash {
+                        flash-timeout-us = <500000>;
+                        flash-max-microamp = <320000>;
+                        max-microamp = <50000>;
+		};
+                indicator {
+                        max-microamp = <17500>;
+		};
+        };
diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
index bc82a12..d04e7cc 100644
--- a/arch/arm/boot/dts/omap3-n900.dts
+++ b/arch/arm/boot/dts/omap3-n900.dts
@@ -553,6 +558,22 @@
 
 		ti,usb-charger-detection = <&isp1704>;
 	};
+
+	adp1653: led-controller@30 {
+		compatible = "adi,adp1653";
+		reg = <0x30>;
+		gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
+
+		flash {
+			flash-timeout-us = <500000>;
+			flash-max-microamp = <320000>;
+			max-microamp = <50000>;
+		};
+
+		indicator {
+			max-microamp = <17500>;
+		};
+	};
 };
 
 &i2c3 {
diff --git a/drivers/media/i2c/adp1653.c b/drivers/media/i2c/adp1653.c
index 873fe19..78341d0 100644
--- a/drivers/media/i2c/adp1653.c
+++ b/drivers/media/i2c/adp1653.c
@@ -8,6 +8,7 @@
  * Contributors:
  *	Sakari Ailus <sakari.ailus-X3B1VOXEql0@public.gmane.org>
  *	Tuukka Toivonen <tuukkat76-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+ *      Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -34,9 +35,12 @@
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
+#include <linux/of_gpio.h>
 #include <media/adp1653.h>
 #include <media/v4l2-device.h>
 
+#include <linux/gpio.h>
+
 #define TIMEOUT_MAX		820000
 #define TIMEOUT_STEP		54600
 #define TIMEOUT_MIN		(TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \
@@ -306,9 +318,18 @@ adp1653_init_device(struct adp1653_flash *flash)
 static int
 __adp1653_set_power(struct adp1653_flash *flash, int on)
 {
-	int ret;
+	int ret = 0;
+
+	if (flash->platform_data->power)
+		ret = flash->platform_data->power(&flash->subdev, on);
+	else {
+		gpio_set_value(flash->platform_data->power_gpio, on);
+		if (on) {
+			/* Some delay is apparently required. */
+			udelay(20);
+		}
+	}
 
-	ret = flash->platform_data->power(&flash->subdev, on);
 	if (ret < 0)
 		return ret;
 
@@ -316,8 +337,13 @@ __adp1653_set_power(struct adp1653_flash *flash, int on)
 		return 0;
 
 	ret = adp1653_init_device(flash);
-	if (ret < 0)
+	if (ret >= 0)
+		return ret;
+
+	if (flash->platform_data->power)
 		flash->platform_data->power(&flash->subdev, 0);
+	else
+		gpio_set_value(flash->platform_data->power_gpio, 0);
 
 	return ret;
 }
@@ -407,21 +433,78 @@ static int adp1653_resume(struct device *dev)
 
 #endif /* CONFIG_PM */
 
+static int adp1653_of_init(struct i2c_client *client,
+			   struct adp1653_flash *flash,
+			   struct device_node *node)
+{
+	u32 val;
+	struct adp1653_platform_data *pd;
+	enum of_gpio_flags flags;
+	int gpio;
+	struct device_node *child;
+
+	if (!node)
+		return -EINVAL;
+
+	pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL);
+	if (!pd)
+		return -ENOMEM;
+	flash->platform_data = pd;
+
+	child = of_get_child_by_name(node, "flash");
+	if (!child)
+		return -EINVAL;
+	if (of_property_read_u32(child, "flash-timeout-microsec", &val))
+		return -EINVAL;
+
+	pd->max_flash_timeout = val;
+	if (of_property_read_u32(child, "flash-max-microamp", &val))
+		return -EINVAL;
+	pd->max_flash_intensity = val/1000;
+
+	if (of_property_read_u32(child, "max-microamp", &val))
+		return -EINVAL;
+	pd->max_torch_intensity = val/1000;
+
+	child = of_get_child_by_name(node, "indicator");
+	if (!child)
+		return -EINVAL;
+	if (of_property_read_u32(child, "max-microamp", &val))
+		return -EINVAL;
+	pd->max_indicator_intensity = val;
+
+	if (!of_find_property(node, "gpios", NULL)) {
+		dev_err(&client->dev, "No gpio node\n");
+		return -EINVAL;
+	}
+
+	gpio = of_get_gpio_flags(node, 0, &flags);
+	if (gpio < 0) {
+		dev_err(&client->dev, "Error getting GPIO\n");
+		return -EINVAL;
+	}
+
+	pd->power_gpio = gpio;
+	return 0;
+}
+
+
 static int adp1653_probe(struct i2c_client *client,
 			 const struct i2c_device_id *devid)
 {
 	struct adp1653_flash *flash;
 	int ret;
 
-	/* we couldn't work without platform data */
-	if (client->dev.platform_data == NULL)
-		return -ENODEV;
-
 	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
 	if (flash == NULL)
 		return -ENOMEM;
 
 	flash->platform_data = client->dev.platform_data;
+	if (!flash->platform_data) {
+		ret = adp1653_of_init(client, flash, client->dev.of_node);
+		if (ret)
+			return ret;
+	}
 
 	mutex_init(&flash->power_lock);
 
@@ -438,10 +521,11 @@ static int adp1653_probe(struct i2c_client *client,
 		goto free_and_quit;
 
 	flash->subdev.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
-
+
 	return 0;
 
 free_and_quit:
+	dev_err(&client->dev, "adp1653: failed to register device\n");
 	v4l2_ctrl_handler_free(&flash->ctrls);
 	return ret;
 }
@@ -464,7 +551,7 @@ static const struct i2c_device_id adp1653_id_table[] = {
 };
 MODULE_DEVICE_TABLE(i2c, adp1653_id_table);
 
-static struct dev_pm_ops adp1653_pm_ops = {
+static const struct dev_pm_ops adp1653_pm_ops = {
 	.suspend	= adp1653_suspend,
 	.resume		= adp1653_resume,
 };


-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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Re: [PATCHv2] media: i2c/adp1653: devicetree support for adp1653

[Rob Herring]

On Wed, Dec 24, 2014 at 4:34 PM, Pavel Machek <pavel@ucw.cz> wrote:
>
> We are moving to device tree support on OMAP3, but that currently
> breaks ADP1653 driver. This adds device tree support, plus required
> documentation.
>
> Signed-off-by: Pavel Machek <pavel@ucw.cz>
>
> ---
>
> Changed -microsec to -us, as requested by devicetree people.
>
> Fixed checkpatch issues.
>
> diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
> index 2d88816..2c6c7c5 100644
> --- a/Documentation/devicetree/bindings/leds/common.txt
> +++ b/Documentation/devicetree/bindings/leds/common.txt
> @@ -14,6 +14,15 @@ Optional properties for child nodes:
>       "ide-disk" - LED indicates disk activity
>       "timer" - LED flashes at a fixed, configurable rate
>
> +- max-microamp : maximum intensity in microamperes of the LED
> +                (torch LED for flash devices)
> +- flash-max-microamp : maximum intensity in microamperes of the
> +                       flash LED; it is mandatory if the LED should
> +                      support the flash mode
> +- flash-timeout-microsec : timeout in microseconds after which the flash
> +                           LED is turned off

Doesn't all this go in your flash led binding patch?

> +
> +
>  Examples:
>
>  system-status {
> @@ -21,3 +30,10 @@ system-status {
>         linux,default-trigger = "heartbeat";
>         ...
>  };
> +
> +camera-flash {
> +       label = "Flash";
> +       max-microamp = <50000>;
> +       flash-max-microamp = <320000>;
> +       flash-timeout-microsec = <500000>;
> +}
> diff --git a/Documentation/devicetree/bindings/media/i2c/adp1653.txt b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
> new file mode 100644
> index 0000000..3c7065f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
> @@ -0,0 +1,38 @@
> +* Analog Devices ADP1653 flash LED driver
> +
> +Required Properties:
> +
> +  - compatible: Must contain one of the following
> +    - "adi,adp1653"
> +
> +  - reg: I2C slave address
> +
> +  - gpios: References to the GPIO that controls the power for the chip.
> +
> +There are two led outputs available - flash and indicator. One led is
> +represented by one child node, nodes need to be named "flash" and "indicator".
> +
> +Required properties of the LED child node:
> +- max-microamp : see Documentation/devicetree/bindings/leds/common.txt
> +
> +Required properties of the flash LED child node:
> +
> +- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
> +- flash-timeout-us : see Documentation/devicetree/bindings/leds/common.txt
> +
> +Example:
> +
> +        adp1653: led-controller@30 {
> +                compatible = "adi,adp1653";
> +               reg = <0x30>;
> +                gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
> +
> +               flash {
> +                        flash-timeout-us = <500000>;
> +                        flash-max-microamp = <320000>;
> +                        max-microamp = <50000>;
> +               };
> +                indicator {

These are different LEDs or different modes?

> +                        max-microamp = <17500>;

This is a bit inconsistent. The binding says this is for flash LEDs
torch mode, but I see no reason why it can't be common. Can you update
the binding doc to be clear here.

Also, aren't you missing label properties?

Rob

Re: [PATCHv2] media: i2c/adp1653: devicetree support for adp1653

[Pavel Machek]

Hi!

> > We are moving to device tree support on OMAP3, but that currently
> > breaks ADP1653 driver. This adds device tree support, plus required
> > documentation.
> >
> > Signed-off-by: Pavel Machek <pavel@ucw.cz>
> >
> > ---
> >
> > Changed -microsec to -us, as requested by devicetree people.
> >
> > Fixed checkpatch issues.
> >
> > diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
> > index 2d88816..2c6c7c5 100644
> > --- a/Documentation/devicetree/bindings/leds/common.txt
> > +++ b/Documentation/devicetree/bindings/leds/common.txt
> > @@ -14,6 +14,15 @@ Optional properties for child nodes:
> >       "ide-disk" - LED indicates disk activity
> >       "timer" - LED flashes at a fixed, configurable rate
> >
> > +- max-microamp : maximum intensity in microamperes of the LED
> > +                (torch LED for flash devices)
> > +- flash-max-microamp : maximum intensity in microamperes of the
> > +                       flash LED; it is mandatory if the LED should
> > +                      support the flash mode
> > +- flash-timeout-microsec : timeout in microseconds after which the flash
> > +                           LED is turned off
> 
> Doesn't all this go in your flash led binding patch?

No, I should not have included this part.

> > +Example:
> > +
> > +        adp1653: led-controller@30 {
> > +                compatible = "adi,adp1653";
> > +               reg = <0x30>;
> > +                gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
> > +
> > +               flash {
> > +                        flash-timeout-us = <500000>;
> > +                        flash-max-microamp = <320000>;
> > +                        max-microamp = <50000>;
> > +               };
> > +                indicator {
> 
> These are different LEDs or different modes?

flash & indicator are different LEDs. One is white, one is red. Flash
can be used as a flash and as a torch.

> > +                        max-microamp = <17500>;
> 
> This is a bit inconsistent. The binding says this is for flash LEDs
> torch mode, but I see no reason why it can't be common. Can you update
> the binding doc to be clear here.

By inconsisnent, you mean you want patch below?

> Also, aren't you missing label properties?

label is optional, and as my driver does not yet use it, I forgot
about it.

Signed-off-by: Pavel Machek <pavel@ucw.cz>

index 2c6c7c5..92d4dac 100644
--- a/Documentation/devicetree/bindings/leds/common.txt
+++ b/Documentation/devicetree/bindings/leds/common.txt
@@ -15,7 +15,6 @@ Optional properties for child nodes:
      "timer" - LED flashes at a fixed, configurable rate
 
 - max-microamp : maximum intensity in microamperes of the LED
-	         (torch LED for flash devices)
 - flash-max-microamp : maximum intensity in microamperes of the
                        flash LED; it is mandatory if the LED should
 		       support the flash mode


-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: [PATCHv2] media: i2c/adp1653: devicetree support for adp1653

[Rob Herring]

On Fri, Dec 26, 2014 at 2:33 PM, Pavel Machek <pavel@ucw.cz> wrote:
> Hi!
>
>> > We are moving to device tree support on OMAP3, but that currently
>> > breaks ADP1653 driver. This adds device tree support, plus required
>> > documentation.
>> >
>> > Signed-off-by: Pavel Machek <pavel@ucw.cz>
>> >
>> > ---
>> >
>> > Changed -microsec to -us, as requested by devicetree people.
>> >
>> > Fixed checkpatch issues.
>> >
>> > diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
>> > index 2d88816..2c6c7c5 100644
>> > --- a/Documentation/devicetree/bindings/leds/common.txt
>> > +++ b/Documentation/devicetree/bindings/leds/common.txt
>> > @@ -14,6 +14,15 @@ Optional properties for child nodes:
>> >       "ide-disk" - LED indicates disk activity
>> >       "timer" - LED flashes at a fixed, configurable rate
>> >
>> > +- max-microamp : maximum intensity in microamperes of the LED
>> > +                (torch LED for flash devices)
>> > +- flash-max-microamp : maximum intensity in microamperes of the
>> > +                       flash LED; it is mandatory if the LED should
>> > +                      support the flash mode
>> > +- flash-timeout-microsec : timeout in microseconds after which the flash
>> > +                           LED is turned off
>>
>> Doesn't all this go in your flash led binding patch?
>
> No, I should not have included this part.
>
>> > +Example:
>> > +
>> > +        adp1653: led-controller@30 {
>> > +                compatible = "adi,adp1653";
>> > +               reg = <0x30>;
>> > +                gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
>> > +
>> > +               flash {
>> > +                        flash-timeout-us = <500000>;
>> > +                        flash-max-microamp = <320000>;
>> > +                        max-microamp = <50000>;
>> > +               };
>> > +                indicator {
>>
>> These are different LEDs or different modes?
>
> flash & indicator are different LEDs. One is white, one is red. Flash
> can be used as a flash and as a torch.
>
>> > +                        max-microamp = <17500>;
>>
>> This is a bit inconsistent. The binding says this is for flash LEDs
>> torch mode, but I see no reason why it can't be common. Can you update
>> the binding doc to be clear here.
>
> By inconsisnent, you mean you want patch below?

Yes.

>> Also, aren't you missing label properties?
>
> label is optional, and as my driver does not yet use it, I forgot
> about it.

Based on your node names, there are obviously user defined functions
for them already. So they should have labels whether or not the driver
uses them.

Rob

> Signed-off-by: Pavel Machek <pavel@ucw.cz>
>
> index 2c6c7c5..92d4dac 100644
> --- a/Documentation/devicetree/bindings/leds/common.txt
> +++ b/Documentation/devicetree/bindings/leds/common.txt
> @@ -15,7 +15,6 @@ Optional properties for child nodes:
>       "timer" - LED flashes at a fixed, configurable rate
>
>  - max-microamp : maximum intensity in microamperes of the LED
> -                (torch LED for flash devices)
>  - flash-max-microamp : maximum intensity in microamperes of the
>                         flash LED; it is mandatory if the LED should
>                        support the flash mode
>
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: [PATCHv2] media: i2c/adp1653: devicetree support for adp1653

[Sakari Ailus]

Hi Pavel,

Thanks for the patch! A few comments below.

On Wed, Dec 24, 2014 at 11:34:34PM +0100, Pavel Machek wrote:
> 
> We are moving to device tree support on OMAP3, but that currently
> breaks ADP1653 driver. This adds device tree support, plus required
> documentation.
> 
> Signed-off-by: Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>
> 
> ---
> 
> Changed -microsec to -us, as requested by devicetree people.
> 
> Fixed checkpatch issues.
> 
> diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
> index 2d88816..2c6c7c5 100644
> --- a/Documentation/devicetree/bindings/leds/common.txt
> +++ b/Documentation/devicetree/bindings/leds/common.txt
> @@ -14,6 +14,15 @@ Optional properties for child nodes:
>       "ide-disk" - LED indicates disk activity
>       "timer" - LED flashes at a fixed, configurable rate
>  
> +- max-microamp : maximum intensity in microamperes of the LED
> +	         (torch LED for flash devices)

s/torch LED/torch mode/

> +- flash-max-microamp : maximum intensity in microamperes of the
> +                       flash LED; it is mandatory if the LED should
> +		       support the flash mode
> +- flash-timeout-microsec : timeout in microseconds after which the flash
> +                           LED is turned off

These should go to a different patch.

> +
> +
>  Examples:
>  
>  system-status {
> @@ -21,3 +30,10 @@ system-status {
>  	linux,default-trigger = "heartbeat";
>  	...
>  };
> +
> +camera-flash {
> +	label = "Flash";
> +	max-microamp = <50000>;
> +	flash-max-microamp = <320000>;
> +	flash-timeout-microsec = <500000>;
> +}
> diff --git a/Documentation/devicetree/bindings/media/i2c/adp1653.txt b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
> new file mode 100644
> index 0000000..3c7065f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
> @@ -0,0 +1,38 @@
> +* Analog Devices ADP1653 flash LED driver
> +
> +Required Properties:
> +
> +  - compatible: Must contain one of the following
> +    - "adi,adp1653"

I doubt whether there are going to be more chips supported with the driver.
There hasn't been since the driver was written not I'm aware of one now.

> +  - reg: I2C slave address
> +
> +  - gpios: References to the GPIO that controls the power for the chip.
> +
> +There are two led outputs available - flash and indicator. One led is
> +represented by one child node, nodes need to be named "flash" and "indicator".

80 characters per line.

> +
> +Required properties of the LED child node:
> +- max-microamp : see Documentation/devicetree/bindings/leds/common.txt
> +
> +Required properties of the flash LED child node:
> +
> +- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
> +- flash-timeout-us : see Documentation/devicetree/bindings/leds/common.txt
> +
> +Example:
> +
> +        adp1653: led-controller@30 {
> +                compatible = "adi,adp1653";
> +		reg = <0x30>;
> +                gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */

Please use tabs for indentation above (and below).

> +
> +		flash {
> +                        flash-timeout-us = <500000>;
> +                        flash-max-microamp = <320000>;
> +                        max-microamp = <50000>;
> +		};
> +                indicator {
> +                        max-microamp = <17500>;
> +		};
> +        };
> diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
> index bc82a12..d04e7cc 100644
> --- a/arch/arm/boot/dts/omap3-n900.dts
> +++ b/arch/arm/boot/dts/omap3-n900.dts
> @@ -553,6 +558,22 @@
>  
>  		ti,usb-charger-detection = <&isp1704>;
>  	};
> +
> +	adp1653: led-controller@30 {
> +		compatible = "adi,adp1653";
> +		reg = <0x30>;
> +		gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
> +
> +		flash {
> +			flash-timeout-us = <500000>;
> +			flash-max-microamp = <320000>;
> +			max-microamp = <50000>;
> +		};
> +
> +		indicator {
> +			max-microamp = <17500>;
> +		};
> +	};

This should go to a separate patch as well.

>  };
>  
>  &i2c3 {
> diff --git a/drivers/media/i2c/adp1653.c b/drivers/media/i2c/adp1653.c
> index 873fe19..78341d0 100644
> --- a/drivers/media/i2c/adp1653.c
> +++ b/drivers/media/i2c/adp1653.c
> @@ -8,6 +8,7 @@
>   * Contributors:
>   *	Sakari Ailus <sakari.ailus-X3B1VOXEql0@public.gmane.org>
>   *	Tuukka Toivonen <tuukkat76-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> + *      Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>
>   *
>   * This program is free software; you can redistribute it and/or
>   * modify it under the terms of the GNU General Public License
> @@ -34,9 +35,12 @@
>  #include <linux/module.h>
>  #include <linux/i2c.h>
>  #include <linux/slab.h>
> +#include <linux/of_gpio.h>
>  #include <media/adp1653.h>
>  #include <media/v4l2-device.h>
>  
> +#include <linux/gpio.h>

Please arrange along with the rest of headers.

> +
>  #define TIMEOUT_MAX		820000
>  #define TIMEOUT_STEP		54600
>  #define TIMEOUT_MIN		(TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \
> @@ -306,9 +318,18 @@ adp1653_init_device(struct adp1653_flash *flash)
>  static int
>  __adp1653_set_power(struct adp1653_flash *flash, int on)
>  {
> -	int ret;
> +	int ret = 0;
> +
> +	if (flash->platform_data->power)
> +		ret = flash->platform_data->power(&flash->subdev, on);

if () {
} else {
}

> +	else {
> +		gpio_set_value(flash->platform_data->power_gpio, on);

Shouldn't you add this to the platform data struct?

power_gpio is actually a poor name for this, as is the "power" callback.
This is really "EN" gpio in the spec, I'd call it perhaps just "gpio", or
"enable_gpio".

> +		if (on) {
> +			/* Some delay is apparently required. */
> +			udelay(20);

The driver should always handle the delay, platform data or not. This
reminds me --- is there a need to retain the support for platform data? I
don't think it's being used anywhere. I'm fine with both keeping and
removing it.

> +		}
> +	}
>  
> -	ret = flash->platform_data->power(&flash->subdev, on);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -316,8 +337,13 @@ __adp1653_set_power(struct adp1653_flash *flash, int on)
>  		return 0;
>  
>  	ret = adp1653_init_device(flash);
> -	if (ret < 0)
> +	if (ret >= 0)
> +		return ret;
> +
> +	if (flash->platform_data->power)
>  		flash->platform_data->power(&flash->subdev, 0);
> +	else
> +		gpio_set_value(flash->platform_data->power_gpio, 0);
>  
>  	return ret;
>  }
> @@ -407,21 +433,78 @@ static int adp1653_resume(struct device *dev)
>  
>  #endif /* CONFIG_PM */
>  
> +static int adp1653_of_init(struct i2c_client *client,
> +			   struct adp1653_flash *flash,
> +			   struct device_node *node)
> +{
> +	u32 val;
> +	struct adp1653_platform_data *pd;
> +	enum of_gpio_flags flags;
> +	int gpio;
> +	struct device_node *child;
> +
> +	if (!node)
> +		return -EINVAL;
> +
> +	pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL);
> +	if (!pd)
> +		return -ENOMEM;
> +	flash->platform_data = pd;
> +
> +	child = of_get_child_by_name(node, "flash");
> +	if (!child)
> +		return -EINVAL;
> +	if (of_property_read_u32(child, "flash-timeout-microsec", &val))
> +		return -EINVAL;
> +
> +	pd->max_flash_timeout = val;
> +	if (of_property_read_u32(child, "flash-max-microamp", &val))
> +		return -EINVAL;
> +	pd->max_flash_intensity = val/1000;
> +
> +	if (of_property_read_u32(child, "max-microamp", &val))
> +		return -EINVAL;
> +	pd->max_torch_intensity = val/1000;
> +
> +	child = of_get_child_by_name(node, "indicator");
> +	if (!child)
> +		return -EINVAL;

Do you require an indicator to be connected? I think it shouldn't be
mandatory, at least the driver should work without it, even if it exposes
the control (making that conditional would be a subject for another patch,
but that doesn't need to be done now).

> +	if (of_property_read_u32(child, "max-microamp", &val))
> +		return -EINVAL;
> +	pd->max_indicator_intensity = val;
> +
> +	if (!of_find_property(node, "gpios", NULL)) {
> +		dev_err(&client->dev, "No gpio node\n");
> +		return -EINVAL;
> +	}
> +
> +	gpio = of_get_gpio_flags(node, 0, &flags);

You could assign to pd->... here.

> +	if (gpio < 0) {
> +		dev_err(&client->dev, "Error getting GPIO\n");
> +		return -EINVAL;
> +	}
> +
> +	pd->power_gpio = gpio;
> +	return 0;
> +}
> +
> +
>  static int adp1653_probe(struct i2c_client *client,
>  			 const struct i2c_device_id *devid)
>  {
>  	struct adp1653_flash *flash;
>  	int ret;
>  
> -	/* we couldn't work without platform data */
> -	if (client->dev.platform_data == NULL)
> -		return -ENODEV;
> -
>  	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
>  	if (flash == NULL)
>  		return -ENOMEM;
>  
>  	flash->platform_data = client->dev.platform_data;
> +	if (!flash->platform_data) {
> +		ret = adp1653_of_init(client, flash, client->dev.of_node);
> +		if (ret)
> +			return ret;
> +	}
>  
>  	mutex_init(&flash->power_lock);
>  
> @@ -438,10 +521,11 @@ static int adp1653_probe(struct i2c_client *client,
>  		goto free_and_quit;
>  
>  	flash->subdev.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
> -
> +

Huh? :-)

>  	return 0;
>  
>  free_and_quit:
> +	dev_err(&client->dev, "adp1653: failed to register device\n");
>  	v4l2_ctrl_handler_free(&flash->ctrls);
>  	return ret;
>  }
> @@ -464,7 +551,7 @@ static const struct i2c_device_id adp1653_id_table[] = {
>  };
>  MODULE_DEVICE_TABLE(i2c, adp1653_id_table);
>  
> -static struct dev_pm_ops adp1653_pm_ops = {
> +static const struct dev_pm_ops adp1653_pm_ops = {
>  	.suspend	= adp1653_suspend,
>  	.resume		= adp1653_resume,
>  };
> 
> 

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus-X3B1VOXEql0@public.gmane.org	XMPP: sailus-PCDdDYkjdNMDXYZnReoRVg@public.gmane.org
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Re: [PATCHv2] media: i2c/adp1653: devicetree support for adp1653

[Pavel Machek]

Hi!

> Thanks for the patch! A few comments below.
> 
> On Wed, Dec 24, 2014 at 11:34:34PM +0100, Pavel Machek wrote:
> > 
> > We are moving to device tree support on OMAP3, but that currently
> > breaks ADP1653 driver. This adds device tree support, plus required
> > documentation.
> > 
> > Signed-off-by: Pavel Machek <pavel@ucw.cz>
> > 
> > ---
> > 
> > Changed -microsec to -us, as requested by devicetree people.
> > 
> > Fixed checkpatch issues.
> > 
> > diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
> > index 2d88816..2c6c7c5 100644
> > --- a/Documentation/devicetree/bindings/leds/common.txt
> > +++ b/Documentation/devicetree/bindings/leds/common.txt
> > @@ -14,6 +14,15 @@ Optional properties for child nodes:
> >       "ide-disk" - LED indicates disk activity
> >       "timer" - LED flashes at a fixed, configurable rate
> >  
> > +- max-microamp : maximum intensity in microamperes of the LED
> > +	         (torch LED for flash devices)
> 
> s/torch LED/torch mode/
> 
> > +- flash-max-microamp : maximum intensity in microamperes of the
> > +                       flash LED; it is mandatory if the LED should
> > +		       support the flash mode
> > +- flash-timeout-microsec : timeout in microseconds after which the flash
> > +                           LED is turned off
> 
> These should go to a different patch.

Actually these both should not be in this patch in the first place.

> > +  - reg: I2C slave address
> > +
> > +  - gpios: References to the GPIO that controls the power for the chip.
> > +
> > +There are two led outputs available - flash and indicator. One led is
> > +represented by one child node, nodes need to be named "flash" and "indicator".
> 
> 80 characters per line.

Count them. It is.

> > +
> > +Required properties of the LED child node:
> > +- max-microamp : see Documentation/devicetree/bindings/leds/common.txt
> > +
> > +Required properties of the flash LED child node:
> > +
> > +- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
> > +- flash-timeout-us : see Documentation/devicetree/bindings/leds/common.txt
> > +
> > +Example:
> > +
> > +        adp1653: led-controller@30 {
> > +                compatible = "adi,adp1653";
> > +		reg = <0x30>;
> > +                gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
> 
> Please use tabs for indentation above (and below).

Ok.

> > --- a/arch/arm/boot/dts/omap3-n900.dts
> > +++ b/arch/arm/boot/dts/omap3-n900.dts
> > @@ -553,6 +558,22 @@
> >  
> >  		ti,usb-charger-detection = <&isp1704>;
> >  	};
> > +
> > +	adp1653: led-controller@30 {
> > +		compatible = "adi,adp1653";
> > +		reg = <0x30>;
> > +		gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
> > +
> > +		flash {
> > +			flash-timeout-us = <500000>;
> > +			flash-max-microamp = <320000>;
> > +			max-microamp = <50000>;
> > +		};
> > +
> > +		indicator {
> > +			max-microamp = <17500>;
> > +		};
> > +	};
> 
> This should go to a separate patch as well.

How many patches do I need to do for one trivial change? :-(.


> > +	if (flash->platform_data->power)
> > +		ret = flash->platform_data->power(&flash->subdev, on);
> 
> if () {
> } else {
> }

Ok.

> > +	else {
> > +		gpio_set_value(flash->platform_data->power_gpio, on);
> 
> Shouldn't you add this to the platform data struct?

I don't see what you mean.

> power_gpio is actually a poor name for this, as is the "power" callback.
> This is really "EN" gpio in the spec, I'd call it perhaps just "gpio", or
> "enable_gpio".

Feel free to clean that that up in followup patch.

> > +		if (on) {
> > +			/* Some delay is apparently required. */
> > +			udelay(20);
> 
> The driver should always handle the delay, platform data or not. This
> reminds me --- is there a need to retain the support for platform data? I
> don't think it's being used anywhere. I'm fine with both keeping and
> removing it.

Lets do that in followup patch, if needed.

> > +	child = of_get_child_by_name(node, "indicator");
> > +	if (!child)
> > +		return -EINVAL;
> 
> Do you require an indicator to be connected? I think it shouldn't be
> mandatory, at least the driver should work without it, even if it
> exposes
> the control (making that conditional would be a subject for another patch,
> but that doesn't need to be done now).

Another patch, if someone needs it, yes.	

> > +	if (of_property_read_u32(child, "max-microamp", &val))
> > +		return -EINVAL;
> > +	pd->max_indicator_intensity = val;
> > +
> > +	if (!of_find_property(node, "gpios", NULL)) {
> > +		dev_err(&client->dev, "No gpio node\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	gpio = of_get_gpio_flags(node, 0, &flags);
> 
> You could assign to pd->... here.

Ok.
								Pavel

-- 
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[PATCHv3] media: i2c/adp1653: devicetree support for adp1653

[Pavel Machek]

We are moving to device tree support on OMAP3, but that currently
breaks ADP1653 driver. This adds device tree support, plus required
documentation.

Signed-off-by: Pavel Machek <pavel@ucw.cz>

---

Please apply,
							Pavel

diff --git a/Documentation/devicetree/bindings/media/i2c/adp1653.txt b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
new file mode 100644
index 0000000..0fc28a9
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
@@ -0,0 +1,37 @@
+* Analog Devices ADP1653 flash LED driver
+
+Required Properties:
+
+  - compatible: Must contain be "adi,adp1653"
+
+  - reg: I2C slave address
+
+  - gpios: References to the GPIO that controls the power for the chip.
+
+There are two led outputs available - flash and indicator. One led is
+represented by one child node, nodes need to be named "flash" and "indicator".
+
+Required properties of the LED child node:
+- max-microamp : see Documentation/devicetree/bindings/leds/common.txt
+
+Required properties of the flash LED child node:
+
+- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
+- flash-timeout-us : see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+	adp1653: led-controller@30 {
+		compatible = "adi,adp1653";
+		reg = <0x30>;
+		gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
+
+		flash {
+			flash-timeout-us = <500000>;
+			flash-max-microamp = <320000>;
+			max-microamp = <50000>;
+		};
+		indicator {
+			max-microamp = <17500>;
+		};
+	};
diff --git a/drivers/media/i2c/adp1653.c b/drivers/media/i2c/adp1653.c
index 873fe19..0341009 100644
--- a/drivers/media/i2c/adp1653.c
+++ b/drivers/media/i2c/adp1653.c
@@ -8,6 +8,7 @@
  * Contributors:
  *	Sakari Ailus <sakari.ailus@iki.fi>
  *	Tuukka Toivonen <tuukkat76@gmail.com>
+ *	Pavel Machek <pavel@ucw.cz>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -34,6 +35,8 @@
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio.h>
 #include <media/adp1653.h>
 #include <media/v4l2-device.h>
 
@@ -306,9 +309,17 @@ adp1653_init_device(struct adp1653_flash *flash)
 static int
 __adp1653_set_power(struct adp1653_flash *flash, int on)
 {
-	int ret;
+	int ret = 0;
+
+	if (flash->platform_data->power) {
+		ret = flash->platform_data->power(&flash->subdev, on);
+	} else {
+		gpio_set_value(flash->platform_data->power_gpio, on);
+		if (on)
+			/* Some delay is apparently required. */
+			udelay(20);
+	}
 
-	ret = flash->platform_data->power(&flash->subdev, on);
 	if (ret < 0)
 		return ret;
 
@@ -316,8 +327,13 @@ __adp1653_set_power(struct adp1653_flash *flash, int on)
 		return 0;
 
 	ret = adp1653_init_device(flash);
-	if (ret < 0)
+	if (ret >= 0)
+		return ret;
+
+	if (flash->platform_data->power)
 		flash->platform_data->power(&flash->subdev, 0);
+	else
+		gpio_set_value(flash->platform_data->power_gpio, 0);
 
 	return ret;
 }
@@ -407,21 +423,77 @@ static int adp1653_resume(struct device *dev)
 
 #endif /* CONFIG_PM */
 
+static int adp1653_of_init(struct i2c_client *client,
+			   struct adp1653_flash *flash,
+			   struct device_node *node)
+{
+	u32 val;
+	struct adp1653_platform_data *pd;
+	enum of_gpio_flags flags;
+	int gpio;
+	struct device_node *child;
+
+	if (!node)
+		return -EINVAL;
+
+	pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL);
+	if (!pd)
+		return -ENOMEM;
+	flash->platform_data = pd;
+
+	child = of_get_child_by_name(node, "flash");
+	if (!child)
+		return -EINVAL;
+	if (of_property_read_u32(child, "flash-timeout-microsec", &val))
+		return -EINVAL;
+
+	pd->max_flash_timeout = val;
+	if (of_property_read_u32(child, "flash-max-microamp", &val))
+		return -EINVAL;
+	pd->max_flash_intensity = val/1000;
+
+	if (of_property_read_u32(child, "max-microamp", &val))
+		return -EINVAL;
+	pd->max_torch_intensity = val/1000;
+
+	child = of_get_child_by_name(node, "indicator");
+	if (!child)
+		return -EINVAL;
+	if (of_property_read_u32(child, "max-microamp", &val))
+		return -EINVAL;
+	pd->max_indicator_intensity = val;
+
+	if (!of_find_property(node, "gpios", NULL)) {
+		dev_err(&client->dev, "No gpio node\n");
+		return -EINVAL;
+	}
+
+	pd->power_gpio = of_get_gpio_flags(node, 0, &flags);
+	if (pd->power_gpio < 0) {
+		dev_err(&client->dev, "Error getting GPIO\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+
 static int adp1653_probe(struct i2c_client *client,
 			 const struct i2c_device_id *devid)
 {
 	struct adp1653_flash *flash;
 	int ret;
 
-	/* we couldn't work without platform data */
-	if (client->dev.platform_data == NULL)
-		return -ENODEV;
-
 	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
 	if (flash == NULL)
 		return -ENOMEM;
 
 	flash->platform_data = client->dev.platform_data;
+	if (!flash->platform_data) {
+		ret = adp1653_of_init(client, flash, client->dev.of_node);
+		if (ret)
+			return ret;
+	}
 
 	mutex_init(&flash->power_lock);
 
@@ -438,10 +510,10 @@ static int adp1653_probe(struct i2c_client *client,
 		goto free_and_quit;
 
 	flash->subdev.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
-
 	return 0;
 
 free_and_quit:
+	dev_err(&client->dev, "adp1653: failed to register device\n");
 	v4l2_ctrl_handler_free(&flash->ctrls);
 	return ret;
 }
@@ -464,7 +536,7 @@ static const struct i2c_device_id adp1653_id_table[] = {
 };
 MODULE_DEVICE_TABLE(i2c, adp1653_id_table);
 
-static struct dev_pm_ops adp1653_pm_ops = {
+static const struct dev_pm_ops adp1653_pm_ops = {
 	.suspend	= adp1653_suspend,
 	.resume		= adp1653_resume,
 };
 

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: [PATCHv3] media: i2c/adp1653: devicetree support for adp1653

[Pavel Machek]

On Sun 2015-01-04 10:43:52, Pavel Machek wrote:
> 
> We are moving to device tree support on OMAP3, but that currently
> breaks ADP1653 driver. This adds device tree support, plus required
> documentation.
> 
> Signed-off-by: Pavel Machek <pavel@ucw.cz>

Sakari? You are listed as adp1653 maintainer. Did you apply the patch?
Is it going to be in 3.20?

Thanks,
								Pavel
								
> ---
> 
> Please apply,
> 							Pavel
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/adp1653.txt b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
> new file mode 100644
> index 0000000..0fc28a9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
> @@ -0,0 +1,37 @@
> +* Analog Devices ADP1653 flash LED driver

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