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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Archived-At: List-Archive: Hi Robert, On Tue, Mar 31, 2020 at 03:33:45PM +0200, Robert Foss wrote: > Add devicetree match table, and enable ov8856_probe() > to initialize power, clocks and reset pins. > > Signed-off-by: Robert Foss > --- > > - Changes since v2: > * Added "struct device *dev" member to struct ov8856 > * Andy: Switch to optional version of devm_gpiod_get > * Andy: Switch to optional version of devm_clk_get > * Fabio: Add reset sleep period > * Sakari: Unify defines for 19.2Mhz > * Sakari: Remove 24Mhz clock, since it isn't needed for supported modes > * Sakari: Replace dev_info() with dev_dbg() > * Sakari: Switch induction variable type to unsigned > * Sakari: Don't wait for reset_gpio when in ACPI mode > * Sakari: Pull reset GPIO high on power on failure > * Sakari: Add power on/off to resume/suspend > * Sakari: Fix indentation > * Sakari: Power off during ov8856_remove() > * Sakari: Don't sleep during power-on in ACPI mode > * Sakari: Switch to getting xvclk from clk_get_rate > > - Changes since v1: > * Andy & Sakari: Make XVCLK optional since to not break ACPI > * Fabio: Change n_shutdown_gpio name to reset_gpio > * Fabio: Invert reset_gpio due to GPIO_ACTIVE_HIGH -> GPIO_ACTIVE_LOW change > * Fabio: Remove empty line > * Fabio: Remove real error from devm_gpiod_get() failures > * Sakari: ARRAY_SIZE() directly instead of through OV8856_NUM_SUPPLIES > * Sakari: Use XVCLK rate as provided by DT > > drivers/media/i2c/ov8856.c | 141 ++++++++++++++++++++++++++++++++----- > 1 file changed, 125 insertions(+), 16 deletions(-) > > diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c > index 8655842af275..260aaf332631 100644 > --- a/drivers/media/i2c/ov8856.c > +++ b/drivers/media/i2c/ov8856.c > @@ -3,10 +3,13 @@ > > #include > #include > +#include > #include > +#include > #include > #include > #include > +#include > #include > #include > #include > @@ -18,7 +21,7 @@ > #define OV8856_LINK_FREQ_360MHZ 360000000ULL > #define OV8856_LINK_FREQ_180MHZ 180000000ULL > #define OV8856_SCLK 144000000ULL > -#define OV8856_MCLK 19200000 > +#define OV8856_XVCLK_19_2 19200000 > #define OV8856_DATA_LANES 4 > #define OV8856_RGB_DEPTH 10 > > @@ -64,6 +67,12 @@ > > #define to_ov8856(_sd) container_of(_sd, struct ov8856, sd) > > +static const char * const ov8856_supply_names[] = { > + "dovdd", /* Digital I/O power */ > + "avdd", /* Analog power */ > + "dvdd", /* Digital core power */ > +}; > + > enum { > OV8856_LINK_FREQ_720MBPS, > OV8856_LINK_FREQ_360MBPS, > @@ -566,6 +575,11 @@ struct ov8856 { > struct media_pad pad; > struct v4l2_ctrl_handler ctrl_handler; > > + struct device *dev; > + struct clk *xvclk; > + struct gpio_desc *reset_gpio; > + struct regulator_bulk_data supplies[ARRAY_SIZE(ov8856_supply_names)]; > + > /* V4L2 Controls */ > struct v4l2_ctrl *link_freq; > struct v4l2_ctrl *pixel_rate; > @@ -908,6 +922,52 @@ static int ov8856_set_stream(struct v4l2_subdev *sd, int enable) > return ret; > } > > +static int __ov8856_power_on(struct ov8856 *ov8856) > +{ > + struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd); > + int ret; > + > + ret = clk_prepare_enable(ov8856->xvclk); > + if (ret < 0) { > + dev_err(&client->dev, "failed to enable xvclk\n"); > + return ret; > + } > + > + if (is_acpi_node(ov8856->dev->fwnode)) > + return 0; > + > + if (ov8856->reset_gpio) { > + gpiod_set_value_cansleep(ov8856->reset_gpio, GPIOD_OUT_HIGH); > + usleep_range(1000, 2000); > + } > + > + ret = regulator_bulk_enable(ARRAY_SIZE(ov8856_supply_names), > + ov8856->supplies); > + if (ret < 0) { > + dev_err(&client->dev, "failed to enable regulators\n"); > + goto disable_clk; > + } > + > + gpiod_set_value_cansleep(ov8856->reset_gpio, GPIOD_OUT_LOW); > + usleep_range(1500, 1800); > + > + return 0; > + > +disable_clk: > + gpiod_set_value_cansleep(ov8856->reset_gpio, GPIOD_OUT_HIGH); > + clk_disable_unprepare(ov8856->xvclk); > + > + return ret; > +} > + > +static void __ov8856_power_off(struct ov8856 *ov8856) > +{ > + gpiod_set_value_cansleep(ov8856->reset_gpio, GPIOD_OUT_HIGH); > + regulator_bulk_disable(ARRAY_SIZE(ov8856_supply_names), > + ov8856->supplies); > + clk_disable_unprepare(ov8856->xvclk); > +} > + > static int __maybe_unused ov8856_suspend(struct device *dev) > { > struct i2c_client *client = to_i2c_client(dev); > @@ -918,6 +978,7 @@ static int __maybe_unused ov8856_suspend(struct device *dev) > if (ov8856->streaming) > ov8856_stop_streaming(ov8856); > > + __ov8856_power_off(ov8856); > mutex_unlock(&ov8856->mutex); > > return 0; > @@ -931,6 +992,8 @@ static int __maybe_unused ov8856_resume(struct device *dev) > int ret; > > mutex_lock(&ov8856->mutex); > + > + __ov8856_power_on(ov8856); > if (ov8856->streaming) { > ret = ov8856_start_streaming(ov8856); > if (ret) { > @@ -1092,27 +1155,52 @@ static int ov8856_identify_module(struct ov8856 *ov8856) > return 0; > } > > -static int ov8856_check_hwcfg(struct device *dev) > +static int ov8856_get_hwcfg(struct ov8856 *ov8856) > { > + struct device *dev = ov8856->dev; > struct fwnode_handle *ep; > struct fwnode_handle *fwnode = dev_fwnode(dev); > struct v4l2_fwnode_endpoint bus_cfg = { > .bus_type = V4L2_MBUS_CSI2_DPHY > }; > - u32 mclk; > + unsigned long xvclk_rate; > int ret; > unsigned int i, j; > > if (!fwnode) > return -ENXIO; > > - ret = fwnode_property_read_u32(fwnode, "clock-frequency", &mclk); > - if (ret) > - return ret; You'll still need to continue reading the clock-frequency property on ACPI systems, and assume that frequency (as you won't have the clock object). > + ov8856->xvclk = devm_clk_get_optional(dev, "xvclk"); > + if (IS_ERR(ov8856->xvclk)) { > + dev_err(dev, "could not get xvclk clock (%ld)\n", > + PTR_ERR(ov8856->xvclk)); > + return PTR_ERR(ov8856->xvclk); > + } > > - if (mclk != OV8856_MCLK) { > - dev_err(dev, "external clock %d is not supported", mclk); > - return -EINVAL; > + if (ov8856->xvclk) { > + xvclk_rate = clk_get_rate(ov8856->xvclk); > + if (xvclk_rate != OV8856_XVCLK_19_2) { > + dev_err(dev, "external clock %lu is not supported", > + xvclk_rate); > + return -EINVAL; > + } > + } > + > + ov8856->reset_gpio = devm_gpiod_get_optional(dev, "reset", > + GPIOD_OUT_HIGH); > + if (IS_ERR(ov8856->reset_gpio)) { > + dev_dbg(dev, "failed to get reset-gpio\n"); > + return PTR_ERR(ov8856->reset_gpio); > + } > + > + for (i = 0; i < ARRAY_SIZE(ov8856_supply_names); i++) > + ov8856->supplies[i].supply = ov8856_supply_names[i]; > + > + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ov8856_supply_names), > + ov8856->supplies); > + if (ret) { > + dev_warn(dev, "failed to get regulators\n"); > + return ret; > } > > ep = fwnode_graph_get_next_endpoint(fwnode, NULL); > @@ -1169,6 +1257,8 @@ static int ov8856_remove(struct i2c_client *client) > pm_runtime_disable(&client->dev); > mutex_destroy(&ov8856->mutex); > > + __ov8856_power_off(ov8856); > + > return 0; > } > > @@ -1177,22 +1267,31 @@ static int ov8856_probe(struct i2c_client *client) > struct ov8856 *ov8856; > int ret; > > - ret = ov8856_check_hwcfg(&client->dev); > + ov8856 = devm_kzalloc(&client->dev, sizeof(*ov8856), GFP_KERNEL); > + if (!ov8856) > + return -ENOMEM; > + ov8856->dev = &client->dev; > + > + ov8856->dev = &client->dev; What happened here? :-) I think this patch is starting to look quite reasonable. > + ret = ov8856_get_hwcfg(ov8856); > if (ret) { > - dev_err(&client->dev, "failed to check HW configuration: %d", > + dev_err(&client->dev, "failed to get HW configuration: %d", > ret); > return ret; > } > > - ov8856 = devm_kzalloc(&client->dev, sizeof(*ov8856), GFP_KERNEL); > - if (!ov8856) > - return -ENOMEM; > - > v4l2_i2c_subdev_init(&ov8856->sd, client, &ov8856_subdev_ops); > + > + ret = __ov8856_power_on(ov8856); > + if (ret) { > + dev_warn(&client->dev, "failed to power on\n"); > + return ret; > + } > + > ret = ov8856_identify_module(ov8856); > if (ret) { > dev_err(&client->dev, "failed to find sensor: %d", ret); > - return ret; > + goto probe_power_off; > } > > mutex_init(&ov8856->mutex); > @@ -1238,6 +1337,9 @@ static int ov8856_probe(struct i2c_client *client) > v4l2_ctrl_handler_free(ov8856->sd.ctrl_handler); > mutex_destroy(&ov8856->mutex); > > +probe_power_off: > + __ov8856_power_off(ov8856); > + > return ret; > } > > @@ -1254,11 +1356,18 @@ static const struct acpi_device_id ov8856_acpi_ids[] = { > MODULE_DEVICE_TABLE(acpi, ov8856_acpi_ids); > #endif > > +static const struct of_device_id ov8856_of_match[] = { > + { .compatible = "ovti,ov8856" }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(of, ov8856_of_match); > + > static struct i2c_driver ov8856_i2c_driver = { > .driver = { > .name = "ov8856", > .pm = &ov8856_pm_ops, > .acpi_match_table = ACPI_PTR(ov8856_acpi_ids), > + .of_match_table = ov8856_of_match, > }, > .probe_new = ov8856_probe, > .remove = ov8856_remove, -- Regards, Sakari Ailus _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel