[PATCH v8 6/7] media: i2c: add DS90UB913 driver

Tomi Valkeinen
2023-01-20T15:35:10Z

Add driver for TI DS90UB913 FPD-Link III Serializer.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
drivers/media/i2c/Kconfig | 13 +
drivers/media/i2c/Makefile | 1 +
drivers/media/i2c/ds90ub913.c | 851 ++++++++++++++++++++++++++++++++++
3 files changed, 865 insertions(+)
create mode 100644 drivers/media/i2c/ds90ub913.c

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index dc1c7c80dc1c..e0a1c2a5f3bf 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -1601,6 +1601,19 @@ endmenu

menu "Video serializers and deserializers"

+config VIDEO_DS90UB913
+ tristate "TI DS90UB913 FPD-Link III Serializer"
+ depends on OF && I2C && VIDEO_DEV
+ select I2C_ATR
+ select MEDIA_CONTROLLER
+ select OF_GPIO
+ select REGMAP_I2C
+ select V4L2_FWNODE
+ select VIDEO_V4L2_SUBDEV_API
+ help
+ Device driver for the Texas Instruments DS90UB913
+ FPD-Link III Serializer.
+
config VIDEO_DS90UB960
tristate "TI FPD-Link III/IV Deserializers"
depends on OF && I2C && VIDEO_DEV
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 4cd680f3b953..c4875ec8c3b9 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -142,4 +142,5 @@ obj-$(CONFIG_VIDEO_VPX3220) += vpx3220.o
obj-$(CONFIG_VIDEO_VS6624) += vs6624.o
obj-$(CONFIG_VIDEO_WM8739) += wm8739.o
obj-$(CONFIG_VIDEO_WM8775) += wm8775.o
+obj-$(CONFIG_VIDEO_DS90UB913) += ds90ub913.o
obj-$(CONFIG_VIDEO_DS90UB960) += ds90ub960.o
diff --git a/drivers/media/i2c/ds90ub913.c b/drivers/media/i2c/ds90ub913.c
new file mode 100644
index 000000000000..60a07b5bace3
--- /dev/null
+++ b/drivers/media/i2c/ds90ub913.c
@@ -0,0 +1,851 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the Texas Instruments DS90UB913 video serializer
+ *
+ * Based on a driver from Luca Ceresoli <luca@lucaceresoli.net>
+ *
+ * Copyright (c) 2019 Luca Ceresoli <luca@lucaceresoli.net>
+ * Copyright (c) 2023 Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/fwnode.h>
+#include <linux/gpio/driver.h>
+#include <linux/i2c-atr.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#include <media/i2c/ds90ub9xx.h>
+#include <media/v4l2-subdev.h>
+
+#define UB913_PAD_SINK 0
+#define UB913_PAD_SOURCE 1
+
+/*
+ * UB913 has 4 gpios, but gpios 3 and 4 are reserved for external oscillator
+ * mode. Thus we only support 2 gpios for now.
+ */
+#define UB913_NUM_GPIOS 2
+
+#define UB913_REG_RESET_CTL 0x01
+#define UB913_REG_RESET_CTL_DIGITAL_RESET_1 BIT(1)
+#define UB913_REG_RESET_CTL_DIGITAL_RESET_0 BIT(0)
+
+#define UB913_REG_GENERAL_CFG 0x03
+#define UB913_REG_GENERAL_CFG_CRC_ERR_RESET BIT(5)
+#define UB913_REG_GENERAL_CFG_PCLK_RISING BIT(0)
+
+#define UB913_REG_MODE_SEL 0x05
+#define UB913_REG_MODE_SEL_MODE_OVERRIDE BIT(5)
+#define UB913_REG_MODE_SEL_MODE_UP_TO_DATE BIT(4)
+#define UB913_REG_MODE_SEL_MODE_MASK GENMASK(3, 0)
+
+#define UB913_REG_CRC_ERRORS_LSB 0x0a
+#define UB913_REG_CRC_ERRORS_MSB 0x0b
+
+#define UB913_REG_GENERAL_STATUS 0x0c
+
+#define UB913_REG_GPIO_CFG(n) (0x0d + (n))
+#define UB913_REG_GPIO_CFG_ENABLE(n) BIT(0 + (n) * 4)
+#define UB913_REG_GPIO_CFG_DIR_INPUT(n) BIT(1 + (n) * 4)
+#define UB913_REG_GPIO_CFG_REMOTE_EN(n) BIT(2 + (n) * 4)
+#define UB913_REG_GPIO_CFG_OUT_VAL(n) BIT(3 + (n) * 4)
+#define UB913_REG_GPIO_CFG_MASK(n) (0xf << ((n) * 4))
+
+#define UB913_REG_SCL_HIGH_TIME 0x11
+#define UB913_REG_SCL_LOW_TIME 0x12
+
+#define UB913_REG_PLL_OVR 0x35
+
+struct ub913_data {
+ struct i2c_client *client;
+ struct regmap *regmap;
+ struct clk *clkin;
+
+ struct gpio_chip gpio_chip;
+
+ struct v4l2_subdev sd;
+ struct media_pad pads[2];
+
+ struct v4l2_async_notifier notifier;
+
+ struct v4l2_subdev *source_sd;
+ u16 source_sd_pad;
+
+ u64 enabled_source_streams;
+
+ struct clk_hw *clkout_clk_hw;
+
+ struct ds90ub9xx_platform_data *plat_data;
+
+ u32 pclk_polarity;
+};
+
+static inline struct ub913_data *sd_to_ub913(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct ub913_data, sd);
+}
+
+static int ub913_read(const struct ub913_data *priv, u8 reg, u8 *val)
+{
+ unsigned int v;
+ int ret;
+
+ ret = regmap_read(priv->regmap, reg, &v);
+ if (ret < 0) {
+ dev_err(&priv->client->dev,
+ "Cannot read register 0x%02x: %d!\n", reg, ret);
+ return ret;
+ }
+
+ *val = v;
+ return 0;
+}
+
+static int ub913_write(const struct ub913_data *priv, u8 reg, u8 val)
+{
+ int ret;
+
+ ret = regmap_write(priv->regmap, reg, val);
+ if (ret < 0)
+ dev_err(&priv->client->dev,
+ "Cannot write register 0x%02x: %d!\n", reg, ret);
+
+ return ret;
+}
+
+/*
+ * GPIO chip
+ */
+static int ub913_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+ return GPIO_LINE_DIRECTION_OUT;
+}
+
+static int ub913_gpio_direction_out(struct gpio_chip *gc, unsigned int offset,
+ int value)
+{
+ struct ub913_data *priv = gpiochip_get_data(gc);
+ unsigned int reg_idx = offset / 2;
+ unsigned int field_idx = offset % 2;
+
+ return regmap_update_bits(priv->regmap, UB913_REG_GPIO_CFG(reg_idx),
+ UB913_REG_GPIO_CFG_MASK(field_idx),
+ UB913_REG_GPIO_CFG_ENABLE(field_idx) |
+ (value ? UB913_REG_GPIO_CFG_OUT_VAL(field_idx) :
+ 0));
+}
+
+static void ub913_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
+{
+ ub913_gpio_direction_out(gc, offset, value);
+}
+
+static int ub913_gpio_of_xlate(struct gpio_chip *gc,
+ const struct of_phandle_args *gpiospec,
+ u32 *flags)
+{
+ if (flags)
+ *flags = gpiospec->args[1];
+
+ return gpiospec->args[0];
+}
+
+static int ub913_gpiochip_probe(struct ub913_data *priv)
+{
+ struct device *dev = &priv->client->dev;
+ struct gpio_chip *gc = &priv->gpio_chip;
+ int ret;
+
+ /* Initialize GPIOs 0 and 1 to local control, tri-state */
+ ub913_write(priv, UB913_REG_GPIO_CFG(0), 0);
+
+ gc->label = dev_name(dev);
+ gc->parent = dev;
+ gc->owner = THIS_MODULE;
+ gc->base = -1;
+ gc->can_sleep = true;
+ gc->ngpio = UB913_NUM_GPIOS;
+ gc->get_direction = ub913_gpio_get_direction;
+ gc->direction_output = ub913_gpio_direction_out;
+ gc->set = ub913_gpio_set;
+ gc->of_xlate = ub913_gpio_of_xlate;
+ gc->of_gpio_n_cells = 2;
+
+ ret = gpiochip_add_data(gc, priv);
+ if (ret) {
+ dev_err(dev, "Failed to add GPIOs: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void ub913_gpiochip_remove(struct ub913_data *priv)
+{
+ gpiochip_remove(&priv->gpio_chip);
+}
+
+static const struct regmap_config ub913_regmap_config = {
+ .name = "ds90ub913",
+ .reg_bits = 8,
+ .val_bits = 8,
+ .reg_format_endian = REGMAP_ENDIAN_DEFAULT,
+ .val_format_endian = REGMAP_ENDIAN_DEFAULT,
+};
+
+/*
+ * V4L2
+ */
+
+static int ub913_enable_streams(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state, u32 pad,
+ u64 streams_mask)
+{
+ struct ub913_data *priv = sd_to_ub913(sd);
+ u64 sink_streams;
+ int ret;
+
+ sink_streams = v4l2_subdev_state_xlate_streams(state, UB913_PAD_SOURCE,
+ UB913_PAD_SINK,
+ &streams_mask);
+
+ ret = v4l2_subdev_enable_streams(priv->source_sd, priv->source_sd_pad,
+ sink_streams);
+ if (ret)
+ return ret;
+
+ priv->enabled_source_streams |= streams_mask;
+
+ return 0;
+}
+
+static int ub913_disable_streams(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state, u32 pad,
+ u64 streams_mask)
+{
+ struct ub913_data *priv = sd_to_ub913(sd);
+ u64 sink_streams;
+ int ret;
+
+ sink_streams = v4l2_subdev_state_xlate_streams(state, UB913_PAD_SOURCE,
+ UB913_PAD_SINK,
+ &streams_mask);
+
+ ret = v4l2_subdev_disable_streams(priv->source_sd, priv->source_sd_pad,
+ sink_streams);
+ if (ret)
+ return ret;
+
+ priv->enabled_source_streams &= ~streams_mask;
+
+ return 0;
+}
+
+static int _ub913_set_routing(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state,
+ struct v4l2_subdev_krouting *routing)
+{
+ static const struct v4l2_mbus_framefmt format = {
+ .width = 640,
+ .height = 480,
+ .code = MEDIA_BUS_FMT_UYVY8_2X8,
+ .field = V4L2_FIELD_NONE,
+ .colorspace = V4L2_COLORSPACE_SRGB,
+ .ycbcr_enc = V4L2_YCBCR_ENC_601,
+ .quantization = V4L2_QUANTIZATION_LIM_RANGE,
+ .xfer_func = V4L2_XFER_FUNC_SRGB,
+ };
+ int ret;
+
+ /*
+ * Note: we can only support up to V4L2_FRAME_DESC_ENTRY_MAX, until
+ * frame desc is made dynamically allocated.
+ */
+
+ if (routing->num_routes > V4L2_FRAME_DESC_ENTRY_MAX)
+ return -EINVAL;
+
+ ret = v4l2_subdev_routing_validate(sd, routing,
+ V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
+ if (ret)
+ return ret;
+
+ ret = v4l2_subdev_set_routing_with_fmt(sd, state, routing, &format);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int ub913_set_routing(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state,
+ enum v4l2_subdev_format_whence which,
+ struct v4l2_subdev_krouting *routing)
+{
+ struct ub913_data *priv = sd_to_ub913(sd);
+
+ if (which == V4L2_SUBDEV_FORMAT_ACTIVE && priv->enabled_source_streams)
+ return -EBUSY;
+
+ return _ub913_set_routing(sd, state, routing);
+}
+
+static int ub913_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
+ struct v4l2_mbus_frame_desc *fd)
+{
+ struct ub913_data *priv = sd_to_ub913(sd);
+ const struct v4l2_subdev_krouting *routing;
+ struct v4l2_mbus_frame_desc source_fd;
+ struct v4l2_subdev_route *route;
+ struct v4l2_subdev_state *state;
+ int ret;
+
+ if (pad != UB913_PAD_SOURCE)
+ return -EINVAL;
+
+ ret = v4l2_subdev_call(priv->source_sd, pad, get_frame_desc,
+ priv->source_sd_pad, &source_fd);
+ if (ret)
+ return ret;
+
+ memset(fd, 0, sizeof(*fd));
+
+ fd->type = V4L2_MBUS_FRAME_DESC_TYPE_PARALLEL;
+
+ state = v4l2_subdev_lock_and_get_active_state(sd);
+
+ routing = &state->routing;
+
+ for_each_active_route(routing, route) {
+ unsigned int i;
+
+ if (route->source_pad != pad)
+ continue;
+
+ for (i = 0; i < source_fd.num_entries; ++i) {
+ if (source_fd.entry[i].stream == route->sink_stream)
+ break;
+ }
+
+ if (i == source_fd.num_entries) {
+ dev_err(&priv->client->dev,
+ "Failed to find stream from source frame desc\n");
+ ret = -EPIPE;
+ goto out_unlock;
+ }
+
+ fd->entry[fd->num_entries].stream = route->source_stream;
+ fd->entry[fd->num_entries].flags = source_fd.entry[i].flags;
+ fd->entry[fd->num_entries].length = source_fd.entry[i].length;
+ fd->entry[fd->num_entries].pixelcode =
+ source_fd.entry[i].pixelcode;
+
+ fd->num_entries++;
+ }
+
+out_unlock:
+ v4l2_subdev_unlock_state(state);
+
+ return ret;
+}
+
+static int ub913_set_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state,
+ struct v4l2_subdev_format *format)
+{
+ struct ub913_data *priv = sd_to_ub913(sd);
+ struct v4l2_mbus_framefmt *fmt;
+
+ if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE &&
+ priv->enabled_source_streams)
+ return -EBUSY;
+
+ /* No transcoding, source and sink formats must match. */
+ if (format->pad == UB913_PAD_SOURCE)
+ return v4l2_subdev_get_fmt(sd, state, format);
+
+ /* Set sink format */
+ fmt = v4l2_subdev_state_get_stream_format(state, format->pad,
+ format->stream);
+ if (!fmt)
+ return -EINVAL;
+
+ *fmt = format->format;
+
+ /* Propagate to source format */
+ fmt = v4l2_subdev_state_get_opposite_stream_format(state, format->pad,
+ format->stream);
+ if (!fmt)
+ return -EINVAL;
+
+ *fmt = format->format;
+
+ return 0;
+}
+
+static int ub913_init_cfg(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state)
+{
+ struct v4l2_subdev_route routes[] = {
+ {
+ .sink_pad = UB913_PAD_SINK,
+ .sink_stream = 0,
+ .source_pad = UB913_PAD_SOURCE,
+ .source_stream = 0,
+ .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
+ },
+ };
+
+ struct v4l2_subdev_krouting routing = {
+ .num_routes = ARRAY_SIZE(routes),
+ .routes = routes,
+ };
+
+ return _ub913_set_routing(sd, state, &routing);
+}
+
+static int ub913_log_status(struct v4l2_subdev *sd)
+{
+ struct ub913_data *priv = sd_to_ub913(sd);
+ struct device *dev = &priv->client->dev;
+ u8 v, v1, v2;
+
+ ub913_read(priv, UB913_REG_MODE_SEL, &v);
+ dev_info(dev, "MODE_SEL %#02x\n", v);
+
+ ub913_read(priv, UB913_REG_CRC_ERRORS_LSB, &v1);
+ ub913_read(priv, UB913_REG_CRC_ERRORS_MSB, &v2);
+ dev_info(dev, "CRC errors %u\n", v1 | (v2 << 8));
+
+ /* clear CRC errors */
+ ub913_read(priv, UB913_REG_GENERAL_CFG, &v);
+ ub913_write(priv, UB913_REG_GENERAL_CFG,
+ v | UB913_REG_GENERAL_CFG_CRC_ERR_RESET);
+ ub913_write(priv, UB913_REG_GENERAL_CFG, v);
+
+ ub913_read(priv, UB913_REG_GENERAL_STATUS, &v);
+ dev_info(dev, "GENERAL_STATUS %#02x\n", v);
+
+ ub913_read(priv, UB913_REG_PLL_OVR, &v);
+ dev_info(dev, "PLL_OVR %#02x\n", v);
+
+ return 0;
+}
+
+static const struct v4l2_subdev_core_ops ub913_subdev_core_ops = {
+ .log_status = ub913_log_status,
+};
+
+static const struct v4l2_subdev_pad_ops ub913_pad_ops = {
+ .enable_streams = ub913_enable_streams,
+ .disable_streams = ub913_disable_streams,
+ .set_routing = ub913_set_routing,
+ .get_frame_desc = ub913_get_frame_desc,
+ .get_fmt = v4l2_subdev_get_fmt,
+ .set_fmt = ub913_set_fmt,
+ .init_cfg = ub913_init_cfg,
+};
+
+static const struct v4l2_subdev_ops ub913_subdev_ops = {
+ .core = &ub913_subdev_core_ops,
+ .pad = &ub913_pad_ops,
+};
+
+static const struct media_entity_operations ub913_entity_ops = {
+ .link_validate = v4l2_subdev_link_validate,
+};
+
+static int ub913_notify_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *source_subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct ub913_data *priv = sd_to_ub913(notifier->sd);
+ struct device *dev = &priv->client->dev;
+ int ret;
+
+ ret = media_entity_get_fwnode_pad(&source_subdev->entity,
+ source_subdev->fwnode,
+ MEDIA_PAD_FL_SOURCE);
+ if (ret < 0) {
+ dev_err(dev, "Failed to find pad for %s\n",
+ source_subdev->name);
+ return ret;
+ }
+
+ priv->source_sd = source_subdev;
+ priv->source_sd_pad = ret;
+
+ ret = media_create_pad_link(&source_subdev->entity, priv->source_sd_pad,
+ &priv->sd.entity, UB913_PAD_SINK,
+ MEDIA_LNK_FL_ENABLED |
+ MEDIA_LNK_FL_IMMUTABLE);
+ if (ret) {
+ dev_err(dev, "Unable to link %s:%u -> %s:0\n",
+ source_subdev->name, priv->source_sd_pad,
+ priv->sd.name);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct v4l2_async_notifier_operations ub913_notify_ops = {
+ .bound = ub913_notify_bound,
+};
+
+static int ub913_v4l2_notifier_register(struct ub913_data *priv)
+{
+ struct device *dev = &priv->client->dev;
+ struct v4l2_async_subdev *asd;
+ struct fwnode_handle *ep_fwnode;
+ int ret;
+
+ ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
+ UB913_PAD_SINK, 0, 0);
+ if (!ep_fwnode) {
+ dev_err(dev, "No graph endpoint\n");
+ return -ENODEV;
+ }
+
+ v4l2_async_nf_init(&priv->notifier);
+
+ asd = v4l2_async_nf_add_fwnode_remote(&priv->notifier, ep_fwnode,
+ struct v4l2_async_subdev);
+
+ fwnode_handle_put(ep_fwnode);
+
+ if (IS_ERR(asd)) {
+ dev_err(dev, "Failed to add subdev: %ld", PTR_ERR(asd));
+ v4l2_async_nf_cleanup(&priv->notifier);
+ return PTR_ERR(asd);
+ }
+
+ priv->notifier.ops = &ub913_notify_ops;
+
+ ret = v4l2_async_subdev_nf_register(&priv->sd, &priv->notifier);
+ if (ret) {
+ dev_err(dev, "Failed to register subdev_notifier");
+ v4l2_async_nf_cleanup(&priv->notifier);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void ub913_v4l2_nf_unregister(struct ub913_data *priv)
+{
+ v4l2_async_nf_unregister(&priv->notifier);
+ v4l2_async_nf_cleanup(&priv->notifier);
+}
+
+static int ub913_register_clkout(struct ub913_data *priv)
+{
+ struct device *dev = &priv->client->dev;
+ const char *name;
+ int ret;
+
+ name = kasprintf(GFP_KERNEL, "ds90ub913.%s.clk_out", dev_name(dev));
+ if (!name)
+ return -ENOMEM;
+
+ priv->clkout_clk_hw = devm_clk_hw_register_fixed_factor(dev, name,
+ __clk_get_name(priv->clkin), 0, 1, 2);
+
+ kfree(name);
+
+ if (IS_ERR(priv->clkout_clk_hw))
+ return dev_err_probe(dev, PTR_ERR(priv->clkout_clk_hw),
+ "Cannot register clkout hw\n");
+
+ ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
+ priv->clkout_clk_hw);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Cannot add OF clock provider\n");
+
+ return 0;
+}
+
+static int ub913_i2c_master_init(struct ub913_data *priv)
+{
+ /* i2c fast mode */
+ u32 scl_high = 600 + 300; /* high period + rise time, ns */
+ u32 scl_low = 1300 + 300; /* low period + fall time, ns */
+ unsigned long ref;
+ int ret;
+
+ ref = clk_get_rate(priv->clkin) / 2;
+
+ scl_high = div64_u64((u64)scl_high * ref, 1000000000);
+ scl_low = div64_u64((u64)scl_low * ref, 1000000000);
+
+ ret = ub913_write(priv, UB913_REG_SCL_HIGH_TIME, scl_high);
+ if (ret)
+ return ret;
+
+ ret = ub913_write(priv, UB913_REG_SCL_LOW_TIME, scl_low);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int ub913_add_i2c_adapter(struct ub913_data *priv)
+{
+ struct device *dev = &priv->client->dev;
+ struct fwnode_handle *i2c_handle;
+ int ret;
+
+ i2c_handle = device_get_named_child_node(dev, "i2c");
+ if (!i2c_handle)
+ return 0;
+
+ ret = i2c_atr_add_adapter(priv->plat_data->atr, priv->plat_data->port,
+ i2c_handle);
+
+ fwnode_handle_put(i2c_handle);
+
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int ub913_parse_dt(struct ub913_data *priv)
+{
+ struct device *dev = &priv->client->dev;
+ struct fwnode_handle *ep_fwnode;
+ int ret;
+
+ ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
+ UB913_PAD_SINK, 0, 0);
+ if (!ep_fwnode) {
+ dev_err_probe(dev, -ENOENT, "No sink endpoint\n");
+ return -ENOENT;
+ }
+
+ ret = fwnode_property_read_u32(ep_fwnode, "pclk-sample",
+ &priv->pclk_polarity);
+
+ fwnode_handle_put(ep_fwnode);
+
+ if (ret) {
+ dev_err_probe(dev, ret, "failed to parse 'pclk-sample'\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ub913_hw_init(struct ub913_data *priv)
+{
+ struct device *dev = &priv->client->dev;
+ bool mode_override;
+ u8 mode;
+ int ret;
+ u8 v;
+
+ ret = ub913_read(priv, UB913_REG_MODE_SEL, &v);
+ if (ret)
+ return ret;
+
+ if (!(v & UB913_REG_MODE_SEL_MODE_UP_TO_DATE))
+ return dev_err_probe(dev, -ENODEV,
+ "Mode value not stabilized\n");
+
+ mode_override = v & UB913_REG_MODE_SEL_MODE_OVERRIDE;
+ mode = v & UB913_REG_MODE_SEL_MODE_MASK;
+
+ dev_dbg(dev, "mode from %s: %#x\n",
+ mode_override ? "reg" : "deserializer", mode);
+
+ ret = ub913_i2c_master_init(priv);
+ if (ret)
+ return dev_err_probe(dev, ret, "i2c master init failed\n");
+
+ ub913_read(priv, UB913_REG_GENERAL_CFG, &v);
+ v &= ~UB913_REG_GENERAL_CFG_PCLK_RISING;
+ v |= priv->pclk_polarity ? UB913_REG_GENERAL_CFG_PCLK_RISING : 0;
+ ub913_write(priv, UB913_REG_GENERAL_CFG, v);
+
+ return 0;
+}
+
+static int ub913_subdev_init(struct ub913_data *priv)
+{
+ struct device *dev = &priv->client->dev;
+ int ret;
+
+ v4l2_i2c_subdev_init(&priv->sd, priv->client, &ub913_subdev_ops);
+ priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS;
+ priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+ priv->sd.entity.ops = &ub913_entity_ops;
+
+ priv->pads[0].flags = MEDIA_PAD_FL_SINK;
+ priv->pads[1].flags = MEDIA_PAD_FL_SOURCE;
+
+ ret = media_entity_pads_init(&priv->sd.entity, 2, priv->pads);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to init pads\n");
+
+ priv->sd.fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
+ UB913_PAD_SOURCE, 0,
+ 0);
+
+ if (!priv->sd.fwnode) {
+ ret = -ENODEV;
+ dev_err_probe(dev, ret, "Missing TX endpoint\n");
+ goto err_entity_cleanup;
+ }
+
+ ret = v4l2_subdev_init_finalize(&priv->sd);
+ if (ret)
+ goto err_fwnode_put;
+
+ ret = ub913_v4l2_notifier_register(priv);
+ if (ret) {
+ dev_err_probe(dev, ret,
+ "v4l2 subdev notifier register failed\n");
+ goto err_subdev_cleanup;
+ }
+
+ ret = v4l2_async_register_subdev(&priv->sd);
+ if (ret) {
+ dev_err_probe(dev, ret, "v4l2_async_register_subdev error\n");
+ goto err_unreg_notif;
+ }
+
+ return 0;
+
+err_unreg_notif:
+ ub913_v4l2_nf_unregister(priv);
+err_subdev_cleanup:
+ v4l2_subdev_cleanup(&priv->sd);
+err_fwnode_put:
+ fwnode_handle_put(priv->sd.fwnode);
+err_entity_cleanup:
+ media_entity_cleanup(&priv->sd.entity);
+
+ return ret;
+}
+
+static void ub913_subdev_uninit(struct ub913_data *priv)
+{
+ v4l2_async_unregister_subdev(&priv->sd);
+ ub913_v4l2_nf_unregister(priv);
+ v4l2_subdev_cleanup(&priv->sd);
+ fwnode_handle_put(priv->sd.fwnode);
+ media_entity_cleanup(&priv->sd.entity);
+}
+
+static int ub913_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct ub913_data *priv;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->client = client;
+
+ priv->plat_data = dev_get_platdata(&client->dev);
+ if (!priv->plat_data)
+ return dev_err_probe(dev, -ENODEV, "Platform data missing\n");
+
+ priv->regmap = devm_regmap_init_i2c(client, &ub913_regmap_config);
+ if (IS_ERR(priv->regmap))
+ return dev_err_probe(dev, PTR_ERR(priv->regmap),
+ "Failed to init regmap\n");
+
+ /*
+ * ub913 can also work without ext clock, but that is not supported by
+ * the driver yet.
+ */
+ priv->clkin = devm_clk_get(dev, "clkin");
+ if (IS_ERR(priv->clkin))
+ return dev_err_probe(dev, PTR_ERR(priv->clkin),
+ "Cannot get CLKIN\n");
+
+ ret = ub913_parse_dt(priv);
+ if (ret)
+ return ret;
+
+ ret = ub913_hw_init(priv);
+ if (ret)
+ return ret;
+
+ ret = ub913_gpiochip_probe(priv);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to init gpiochip\n");
+
+ ret = ub913_register_clkout(priv);
+ if (ret) {
+ dev_err_probe(dev, ret, "Failed to register clkout\n");
+ goto err_gpiochip_remove;
+ }
+
+ ret = ub913_subdev_init(priv);
+ if (ret)
+ goto err_gpiochip_remove;
+
+ ret = ub913_add_i2c_adapter(priv);
+ if (ret) {
+ dev_err_probe(dev, ret, "failed to add remote i2c adapter\n");
+ goto err_subdev_uninit;
+ }
+
+ return 0;
+
+err_subdev_uninit:
+ ub913_subdev_uninit(priv);
+err_gpiochip_remove:
+ ub913_gpiochip_remove(priv);
+
+ return ret;
+}
+
+static void ub913_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct ub913_data *priv = sd_to_ub913(sd);
+
+ i2c_atr_del_adapter(priv->plat_data->atr, priv->plat_data->port);
+
+ ub913_subdev_uninit(priv);
+
+ ub913_gpiochip_remove(priv);
+}
+
+static const struct i2c_device_id ub913_id[] = { { "ds90ub913a-q1", 0 }, {} };
+MODULE_DEVICE_TABLE(i2c, ub913_id);
+
+static const struct of_device_id ub913_dt_ids[] = {
+ { .compatible = "ti,ds90ub913a-q1" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, ub913_dt_ids);
+
+static struct i2c_driver ds90ub913_driver = {
+ .probe_new = ub913_probe,
+ .remove = ub913_remove,
+ .id_table = ub913_id,
+ .driver = {
+ .name = "ds90ub913a",
+ .of_match_table = ub913_dt_ids,
+ },
+};
+module_i2c_driver(ds90ub913_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Texas Instruments DS90UB913 FPD-Link III Serializer Driver");
+MODULE_AUTHOR("Luca Ceresoli <luca@lucaceresoli.net>");
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>");
+MODULE_IMPORT_NS(I2C_ATR);
--
2.34.1