The ov9650 driver currently only supports legacy platform data probe. This change adds device tree probing.
There has been an attempt to add device tree support for ov9650 driver by Hugues Fruchet as a part of the patchset that adds support of OV9655 camera (http://www.spinics.net/lists/linux-media/msg117903.html), but it wasn't merged into mainline because creating a separate driver for OV9655 is preferred. This is very similar to Hugues's patch, but not supporting new device. Cc: H. Nikolaus Schaller <h...@goldelico.com> Cc: Hugues Fruchet <hugues.fruc...@st.com> Cc: Sakari Ailus <sakari.ai...@linux.intel.com> Cc: Mauro Carvalho Chehab <mche...@s-opensource.com> Cc: Rob Herring <r...@kernel.org> Signed-off-by: Akinobu Mita <akinobu.m...@gmail.com> --- .../devicetree/bindings/media/i2c/ov9650.txt | 35 +++++++ drivers/media/i2c/ov9650.c | 107 ++++++++++++++++----- 2 files changed, 117 insertions(+), 25 deletions(-) create mode 100644 Documentation/devicetree/bindings/media/i2c/ov9650.txt diff --git a/Documentation/devicetree/bindings/media/i2c/ov9650.txt b/Documentation/devicetree/bindings/media/i2c/ov9650.txt new file mode 100644 index 0000000..aa5024d --- /dev/null +++ b/Documentation/devicetree/bindings/media/i2c/ov9650.txt @@ -0,0 +1,35 @@ +* Omnivision OV9650/OV9652 CMOS sensor + +Required Properties: +- compatible: should be one of + "ovti,ov9650" + "ovti,ov9652" +- clocks: reference to the xvclk input clock. + +Optional Properties: +- reset-gpios: reference to the GPIO connected to the resetb pin, if any. + Active is high. +- powerdown-gpios: reference to the GPIO connected to the pwdn pin, if any. + Active is high. + +The device node must contain one 'port' child node for its digital output +video port, in accordance with the video interface bindings defined in +Documentation/devicetree/bindings/media/video-interfaces.txt. + +Example: + +&i2c0 { + ov9650: camera@30 { + compatible = "ovti,ov9650"; + reg = <0x30>; + reset-gpios = <&axi_gpio_0 0 GPIO_ACTIVE_HIGH>; + powerdown-gpios = <&axi_gpio_0 1 GPIO_ACTIVE_HIGH>; + clocks = <&xclk>; + + port { + ov9650_0: endpoint { + remote-endpoint = <&vcap1_in0>; + }; + }; + }; +}; diff --git a/drivers/media/i2c/ov9650.c b/drivers/media/i2c/ov9650.c index 69433e1..1affdc0 100644 --- a/drivers/media/i2c/ov9650.c +++ b/drivers/media/i2c/ov9650.c @@ -11,8 +11,10 @@ * 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/gpio/consumer.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/media.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; @@ -513,10 +516,9 @@ 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); + gpiod_set_value_cansleep(gpio, val); } static void __ov965x_set_power(struct ov965x *ov965x, int on) @@ -1408,16 +1410,17 @@ static const struct v4l2_subdev_ops ov965x_subdev_ops = { /* * Reset and power down GPIOs configuration */ -static int ov965x_configure_gpios(struct ov965x *ov965x, - const struct ov9650_platform_data *pdata) +static int ov965x_configure_gpios_pdata(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]; + int gpio = gpios[i]; if (!gpio_is_valid(gpio)) continue; @@ -1427,14 +1430,52 @@ static int ov965x_configure_gpios(struct ov965x *ov965x, return ret; v4l2_dbg(1, debug, &ov965x->sd, "set gpio %d to 1\n", gpio); - gpio_set_value(gpio, 1); + gpio_set_value_cansleep(gpio, 1); gpio_export(gpio, 0); - ov965x->gpios[i] = gpio; + ov965x->gpios[i] = gpio_to_desc(gpio); + } + + return 0; +} + +static int ov965x_configure_gpios(struct ov965x *ov965x) +{ + struct device *dev = &ov965x->client->dev; + + ov965x->gpios[GPIO_PWDN] = devm_gpiod_get_optional(dev, "powerdown", + GPIOD_OUT_HIGH); + if (IS_ERR(ov965x->gpios[GPIO_PWDN])) { + dev_info(dev, "can't get %s GPIO\n", "powerdown"); + return PTR_ERR(ov965x->gpios[GPIO_PWDN]); + } + + ov965x->gpios[GPIO_RST] = devm_gpiod_get_optional(dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(ov965x->gpios[GPIO_RST])) { + dev_info(dev, "can't get %s GPIO\n", "reset"); + return PTR_ERR(ov965x->gpios[GPIO_RST]); } return 0; } +static int ov965x_configure_clk(struct ov965x *ov965x) +{ + int ret; + + ov965x->clk = devm_clk_get(&ov965x->client->dev, NULL); + if (IS_ERR(ov965x->clk)) + return PTR_ERR(ov965x->clk); + + ret = clk_prepare_enable(ov965x->clk); + if (ret) + return ret; + + ov965x->mclk_frequency = clk_get_rate(ov965x->clk); + + return 0; +} + static int ov965x_detect_sensor(struct v4l2_subdev *sd) { struct i2c_client *client = v4l2_get_subdevdata(sd); @@ -1476,23 +1517,25 @@ static int ov965x_probe(struct i2c_client *client, struct ov965x *ov965x; int ret; - if (!pdata) { - 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"); - return -EINVAL; - } - ov965x = devm_kzalloc(&client->dev, sizeof(*ov965x), GFP_KERNEL); if (!ov965x) return -ENOMEM; mutex_init(&ov965x->lock); ov965x->client = client; - ov965x->mclk_frequency = pdata->mclk_frequency; + + if (pdata) { + ov965x->mclk_frequency = pdata->mclk_frequency; + if (ov965x->mclk_frequency == 0) { + dev_err(&client->dev, "MCLK frequency not specified\n"); + ret = -EINVAL; + goto err_mutex; + } + } else { + ret = ov965x_configure_clk(ov965x); + if (ret) + goto err_mutex; + } sd = &ov965x->sd; v4l2_i2c_subdev_init(sd, client, &ov965x_subdev_ops); @@ -1502,15 +1545,18 @@ static int ov965x_probe(struct i2c_client *client, sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS; - ret = ov965x_configure_gpios(ov965x, pdata); + if (pdata) + ret = ov965x_configure_gpios_pdata(ov965x, pdata); + else + ret = ov965x_configure_gpios(ov965x); if (ret < 0) - goto err_mutex; + goto err_clk; ov965x->pad.flags = MEDIA_PAD_FL_SOURCE; sd->entity.function = MEDIA_ENT_F_CAM_SENSOR; ret = media_entity_pads_init(&sd->entity, 1, &ov965x->pad); if (ret < 0) - goto err_mutex; + goto err_clk; ret = ov965x_initialize_controls(ov965x); if (ret < 0) @@ -1536,6 +1582,8 @@ static int ov965x_probe(struct i2c_client *client, v4l2_ctrl_handler_free(sd->ctrl_handler); err_me: media_entity_cleanup(&sd->entity); +err_clk: + clk_disable_unprepare(ov965x->clk); err_mutex: mutex_destroy(&ov965x->lock); return ret; @@ -1549,6 +1597,7 @@ static int ov965x_remove(struct i2c_client *client) v4l2_async_unregister_subdev(sd); v4l2_ctrl_handler_free(sd->ctrl_handler); media_entity_cleanup(&sd->entity); + clk_disable_unprepare(ov965x->clk); mutex_destroy(&ov965x->lock); return 0; @@ -1561,9 +1610,17 @@ static const struct i2c_device_id ov965x_id[] = { }; 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 = ov965x_of_match, }, .probe = ov965x_probe, .remove = ov965x_remove, -- 2.7.4
