Hi Akinobu, Thanks for the patch. Please see my comments below.
On Sat, Jan 06, 2018 at 02:49:03AM +0900, Akinobu Mita wrote: > 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 s/must/shall/ Please do say there's one 'endpoint' as well. > +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) Could you call gpiod_set_value_cansleep() directly? > { > - 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); The driver has an s_power callback; this should go there. > + 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, -- Regards, Sakari Ailus sakari.ai...@linux.intel.com
