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SubjectRe: [PATCHv2] media: i2c/adp1653: devicetree support for adp1653
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@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.

> +
> +
> 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@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 +35,12 @@
> #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@iki.fi XMPP: sailus@retiisi.org.uk


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