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SubjectRe: [PATCH v2 3/7] [media] ov9650: add device tree support
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Hi Sakari, thks for review.

On 07/09/2017 01:06 AM, Sakari Ailus wrote:
> Hi Hugues,
>
> On Mon, Jul 03, 2017 at 11:16:04AM +0200, Hugues Fruchet wrote:
>> Allows use of device tree configuration data.
>> If no device tree data is there, configuration is taken from platform data.
>> In order to keep GPIOs configuration compatible between both way of doing,
>> GPIOs are switched to descriptor-based interface.
>>
>> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
>> Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
>> ---
>> drivers/media/i2c/Kconfig | 2 +-
>> drivers/media/i2c/ov9650.c | 77 ++++++++++++++++++++++++++++++++++------------
>> 2 files changed, 59 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
>> index 121b3b5..168115c 100644
>> --- a/drivers/media/i2c/Kconfig
>> +++ b/drivers/media/i2c/Kconfig
>> @@ -615,7 +615,7 @@ config VIDEO_OV7670
>>
>> config VIDEO_OV9650
>> tristate "OmniVision OV9650/OV9652 sensor support"
>> - depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
>> + depends on GPIOLIB && I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
>> ---help---
>> This is a V4L2 sensor-level driver for the Omnivision
>> OV9650 and OV9652 camera sensors.
>> diff --git a/drivers/media/i2c/ov9650.c b/drivers/media/i2c/ov9650.c
>> index 1e4e99e..7e9a902 100644
>> --- a/drivers/media/i2c/ov9650.c
>> +++ b/drivers/media/i2c/ov9650.c
>> @@ -11,12 +11,14 @@
>> * it under the terms of the GNU General Public License version 2 as
>> * published by the Free Software Foundation.
>> */
>> +#include <linux/clk.h>
>> #include <linux/delay.h>
>> #include <linux/gpio.h>
>> #include <linux/i2c.h>
>> #include <linux/kernel.h>
>> #include <linux/media.h>
>> #include <linux/module.h>
>> +#include <linux/of_gpio.h>
>> #include <linux/ratelimit.h>
>> #include <linux/slab.h>
>> #include <linux/string.h>
>> @@ -249,9 +251,10 @@ struct ov965x {
>> struct v4l2_subdev sd;
>> struct media_pad pad;
>> enum v4l2_mbus_type bus_type;
>> - int gpios[NUM_GPIOS];
>> + struct gpio_desc *gpios[NUM_GPIOS];
>> /* External master clock frequency */
>> unsigned long mclk_frequency;
>> + struct clk *clk;
>>
>> /* Protects the struct fields below */
>> struct mutex lock;
>> @@ -511,10 +514,10 @@ static int ov965x_set_color_matrix(struct ov965x *ov965x)
>> return 0;
>> }
>>
>> -static void ov965x_gpio_set(int gpio, int val)
>> +static void ov965x_gpio_set(struct gpio_desc *gpio, int val)
>> {
>> - if (gpio_is_valid(gpio))
>> - gpio_set_value(gpio, val);
>> + if (gpio)
>> + gpiod_set_value_cansleep(gpio, val);
>
> gpiod_set_value_cansleep() can manage with NULL gpio parameter, no need to
> check it.

done

>
>> }
>>
>> static void __ov965x_set_power(struct ov965x *ov965x, int on)
>> @@ -1406,24 +1409,28 @@ static int ov965x_configure_gpios(struct ov965x *ov965x,
>> const struct ov9650_platform_data *pdata)
>> {
>> int ret, i;
>> + int gpios[NUM_GPIOS];
>>
>> - ov965x->gpios[GPIO_PWDN] = pdata->gpio_pwdn;
>> - ov965x->gpios[GPIO_RST] = pdata->gpio_reset;
>> + gpios[GPIO_PWDN] = pdata->gpio_pwdn;
>> + gpios[GPIO_RST] = pdata->gpio_reset;
>>
>> - for (i = 0; i < ARRAY_SIZE(ov965x->gpios); i++) {
>> - int gpio = ov965x->gpios[i];
>> + for (i = 0; i < ARRAY_SIZE(gpios); i++) {
>> + int gpio = gpios[i];
>>
>> if (!gpio_is_valid(gpio))
>> continue;
>> ret = devm_gpio_request_one(&ov965x->client->dev, gpio,
>> - GPIOF_OUT_INIT_HIGH, "OV965X");
>> - if (ret < 0)
>> + GPIOF_OUT_INIT_HIGH, DRIVER_NAME);
>
> DRIVER_NAME is different from "OV965X". Is this an intended change?

Yes it was to unify namings around a single DRIVER_NAME definition.

>
>> + if (ret < 0) {
>> + dev_err(&ov965x->client->dev,
>> + "Failed to request gpio%d (%d)\n", gpio, ret);
>> return ret;
>> + }
>> v4l2_dbg(1, debug, &ov965x->sd, "set gpio %d to 1\n", gpio);
>>
>> gpio_set_value(gpio, 1);
>> gpio_export(gpio, 0);
>> - ov965x->gpios[i] = gpio;
>> + ov965x->gpios[i] = gpio_to_desc(gpio);
>> }
>>
>> return 0;
>> @@ -1469,14 +1476,10 @@ static int ov965x_probe(struct i2c_client *client,
>> struct v4l2_subdev *sd;
>> struct ov965x *ov965x;
>> int ret;
>> + struct device_node *np = client->dev.of_node;
>
> It'd be nice to declare this next to pdata, rather than after ret and other
> short declarations.

done

>
>>
>> - if (pdata == NULL) {
>> - dev_err(&client->dev, "platform data not specified\n");
>> - return -EINVAL;
>> - }
>> -
>> - if (pdata->mclk_frequency == 0) {
>> - dev_err(&client->dev, "MCLK frequency not specified\n");
>> + if (!pdata && !np) {
>> + dev_err(&client->dev, "Platform data or device tree data must be provided\n");
>> return -EINVAL;
>> }
>>
>> @@ -1486,7 +1489,35 @@ static int ov965x_probe(struct i2c_client *client,
>>
>> mutex_init(&ov965x->lock);
>> ov965x->client = client;
>> - ov965x->mclk_frequency = pdata->mclk_frequency;
>> + mutex_init(&ov965x->lock);
>> +
>> + if (np) {
>> + /* Device tree */
>> + ov965x->gpios[GPIO_RST] =
>> + devm_gpiod_get_optional(&client->dev, "resetb",
>> + GPIOD_OUT_LOW);
>> + ov965x->gpios[GPIO_PWDN] =
>> + devm_gpiod_get_optional(&client->dev, "pwdn",
>> + GPIOD_OUT_HIGH);
>> +
>> + ov965x->clk = devm_clk_get(&client->dev, NULL);
>> + if (IS_ERR(ov965x->clk)) {
>> + dev_err(&client->dev, "Could not get clock\n");
>
> mutex_destroy() should called on an initialised mutex if probe is going to
> fail. It's certainly not a problem introduced by this patch, but it'd be
> nice to fix that (in a separate patch) now that it's found. The same goes
> for remove below.

Will do.

>
>> + return PTR_ERR(ov965x->clk);
>> + }
>> + ov965x->mclk_frequency = clk_get_rate(ov965x->clk);
>> + } else {
>> + /* Platform data */
>> + ret = ov965x_configure_gpios(ov965x, pdata);
>> + if (ret < 0)
>> + return ret;
>> +
>> + if (pdata->mclk_frequency == 0) {
>> + dev_err(&client->dev, "MCLK frequency is mandatory\n");
>> + return -EINVAL;
>> + }
>> + ov965x->mclk_frequency = pdata->mclk_frequency;
>> + }
>>
>> sd = &ov965x->sd;
>> v4l2_i2c_subdev_init(sd, client, &ov965x_subdev_ops);
>> @@ -1551,9 +1582,17 @@ static int ov965x_remove(struct i2c_client *client)
>> };
>> MODULE_DEVICE_TABLE(i2c, ov965x_id);
>>
>> +static const struct of_device_id ov965x_of_match[] = {
>> + { .compatible = "ovti,ov9650", },
>> + { .compatible = "ovti,ov9652", },
>> + { /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, ov965x_of_match);
>> +
>> static struct i2c_driver ov965x_i2c_driver = {
>> .driver = {
>> .name = DRIVER_NAME,
>> + .of_match_table = of_match_ptr(ov965x_of_match),
>> },
>> .probe = ov965x_probe,
>> .remove = ov965x_remove,
>
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