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Message-ID: <20150403113216.GK20756@valkosipuli.retiisi.org.uk>
Date: Fri, 3 Apr 2015 14:32:16 +0300
From: Sakari Ailus <sakari.ailus@....fi>
To: Pavel Machek <pavel@....cz>
Cc: Andrew Morton <akpm@...l.org>, pali.rohar@...il.com,
sre@...ian.org, sre@...g0.de,
kernel list <linux-kernel@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
patrikbachan@...il.com, galak@...eaurora.org,
bcousson@...libre.com, m.chehab@...sung.com,
devicetree@...r.kernel.org
Subject: Re: [PATCHv5] media: i2c/adp1653: devicetree support for adp1653
Hi Pavel,
Thanks for the update.
On Fri, Apr 03, 2015 at 10:33:53AM +0200, 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@....cz>
>
> ---
>
> Switched to gpiod_, as requested by Javier.
>
> Please apply,
Let's properly review this first.
> 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..da9934a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
Please split this as Javier suggested. I'd think both could go through
the media-tree unless someone objects.
> @@ -0,0 +1,37 @@
> +* Analog Devices ADP1653 flash LED driver
> +
> +Required Properties:
> +
> + - compatible: Must contain be "adi,adp1653"
> +
> + - reg: I2C slave address
> +
> + - power-gpios: Reference to the GPIO that controls the power for the chip.
You're using power-gpios in documentation only.
The spec refers to this by "EN". How about "en-gpios" instead? This
definitely isn't about power, but about resetting the chip. It gets the
power through another pin.
> +
> +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>;
> + power-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..ba7f43d 100644
> --- a/drivers/media/i2c/adp1653.c
> +++ b/drivers/media/i2c/adp1653.c
> @@ -8,6 +8,7 @@
> * Contributors:
> * Sakari Ailus <sakari.ailus@....fi>
> * Tuukka Toivonen <tuukkat76@...il.com>
> + * Pavel Machek <pavel@....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 {
> + gpiod_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
> + gpiod_set_value(flash->platform_data->power_gpio, 0);
>
> return ret;
> }
> @@ -407,21 +423,75 @@ 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;
> + 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;
I think you need to do of_node_put(child) here and after you're done with
indicator below.
> +
> + 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 = devm_gpiod_get(&client->dev, "power");
> + if (!pd->power_gpio) {
> + 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 (client->dev.of_node) {
> + ret = adp1653_of_init(client, flash, client->dev.of_node);
> + if (ret)
> + return ret;
> + }
>
> mutex_init(&flash->power_lock);
>
> @@ -442,6 +512,7 @@ static int adp1653_probe(struct i2c_client *client,
> 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 +535,7 @@ 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,
> };
> diff --git a/include/media/adp1653.h b/include/media/adp1653.h
> index 1d9b48a..34b505e 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 */
> +
> + struct gpio_desc *power_gpio; /* for device-tree based boot */
> };
>
> #define to_adp1653_flash(sd) container_of(sd, struct adp1653_flash, subdev)
>
--
Kind regards,
Sakari Ailus
e-mail: sakari.ailus@....fi XMPP: sailus@...iisi.org.uk
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