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All incoming CSI traffic will be tunneled through the GMSL2 link. The MAX96717 driver can handle MAX96717 and MAX96717F variants with the same "maxim,max96717f" compatible. Signed-off-by: Julien Massot --- Change since v6: - Kconfig select MEDIA_CONTROLLER, V4L2_FWNODE and VIDEO_V4L2_SUBDEV_API - rename 'REG3' register to 'MAX96717_REG3' - Initialized 'ret' variable in 'max96717_gpiochip_probe' - remove max96714_v4l2_notifier_unregister and call the function directly - Do not store private pointer with i2c_set_clientdata since the v4l2-i2c uses it to store the subdev pointer - use dev_err_probe at gpio chip initialization Change since v5: - set the driver compatible back to MAX96717F that can be used as a fallback for MAX96717 Change since v4: - make the driver compatible with MAX96717 instead of MAX96717F - Add the device id for the MAX96717 - remove hw_data structure for now, it can be usefull later for handling different serializers e.g max9295 Change since v3: - Maintainers: align to the new binding path - Kconfig: better describe the symbol - store the v4l2_mbus_config_mipi_csi2 structure instead of the full endpoint in the driver private structure - use MAX96717_PAD_SINK/SOURCE instead of 0/1 for pad intialization - Removed incorrect call to fwnode_handle_put(priv->sd.fwnode) - Use unsigned int instead of u8 - Allocate clk name out of the clk struct initialization - fixed multiline comment - Removed one unnecessary goto at the end of the probe function Change since v2: - Use CCI helpers instead of recoding register access - add missing bitfield header --- MAINTAINERS | 7 + drivers/media/i2c/Kconfig | 17 + drivers/media/i2c/Makefile | 1 + drivers/media/i2c/max96717.c | 928 +++++++++++++++++++++++++++++++++++ 4 files changed, 953 insertions(+) create mode 100644 drivers/media/i2c/max96717.c diff --git a/MAINTAINERS b/MAINTAINERS index eea74166a2d9..cfaa904ace59 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -13426,6 +13426,13 @@ S: Maintained F: Documentation/devicetree/bindings/media/i2c/maxim,max96712.yaml F: drivers/staging/media/max96712/max96712.c +MAX96717 GMSL2 SERIALIZER DRIVER +M: Julien Massot +L: linux-media@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/media/i2c/maxim,max96717.yaml +F: drivers/media/i2c/max96717.c + MAX9860 MONO AUDIO VOICE CODEC DRIVER M: Peter Rosin L: alsa-devel@alsa-project.org (moderated for non-subscribers) diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig index c6d3ee472d81..9918195e09ba 100644 --- a/drivers/media/i2c/Kconfig +++ b/drivers/media/i2c/Kconfig @@ -1575,6 +1575,23 @@ config VIDEO_DS90UB960 Device driver for the Texas Instruments DS90UB960 FPD-Link III Deserializer and DS90UB9702 FPD-Link IV Deserializer. +config VIDEO_MAX96717 + tristate "Maxim MAX96717 GMSL2 Serializer support" + depends on OF && I2C && VIDEO_DEV && COMMON_CLK + select I2C_MUX + select MEDIA_CONTROLLER + select GPIOLIB + select V4L2_CCI_I2C + select V4L2_FWNODE + select VIDEO_V4L2_SUBDEV_API + help + Device driver for the Maxim MAX96717 GMSL2 Serializer. + MAX96717 serializers convert video on a MIPI CSI-2 + input to a GMSL2 output. + + To compile this driver as a module, choose M here: the + module will be called max96717. + endmenu endif # VIDEO_DEV diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile index dfbe6448b549..9e007116f929 100644 --- a/drivers/media/i2c/Makefile +++ b/drivers/media/i2c/Makefile @@ -64,6 +64,7 @@ obj-$(CONFIG_VIDEO_LM3646) += lm3646.o obj-$(CONFIG_VIDEO_M52790) += m52790.o obj-$(CONFIG_VIDEO_MAX9271_LIB) += max9271.o obj-$(CONFIG_VIDEO_MAX9286) += max9286.o +obj-$(CONFIG_VIDEO_MAX96717) += max96717.o obj-$(CONFIG_VIDEO_ML86V7667) += ml86v7667.o obj-$(CONFIG_VIDEO_MSP3400) += msp3400.o obj-$(CONFIG_VIDEO_MT9M001) += mt9m001.o diff --git a/drivers/media/i2c/max96717.c b/drivers/media/i2c/max96717.c new file mode 100644 index 000000000000..1ea76f922bdb --- /dev/null +++ b/drivers/media/i2c/max96717.c @@ -0,0 +1,928 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Maxim GMSL2 Serializer Driver + * + * Copyright (C) 2024 Collabora Ltd. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#define MAX96717_DEVICE_ID 0xbf +#define MAX96717F_DEVICE_ID 0xc8 +#define MAX96717_PORTS 2 +#define MAX96717_PAD_SINK 0 +#define MAX96717_PAD_SOURCE 1 + +#define MAX96717_DEFAULT_CLKOUT_RATE 24000000UL + +/* DEV */ +#define MAX96717_REG3 CCI_REG8(0x3) +#define MAX96717_RCLKSEL GENMASK(1, 0) +#define RCLKSEL_REF_PLL CCI_REG8(0x3) +#define MAX96717_REG6 CCI_REG8(0x6) +#define RCLKEN BIT(5) +#define MAX96717_DEV_ID CCI_REG8(0xd) +#define MAX96717_DEV_REV CCI_REG8(0xe) +#define MAX96717_DEV_REV_MASK GENMASK(3, 0) + +/* VID_TX Z */ +#define MAX96717_VIDEO_TX2 CCI_REG8(0x112) +#define MAX96717_VIDEO_PCLKDET BIT(7) + +/* GPIO */ +#define MAX96717_NUM_GPIO 11 +#define MAX96717_GPIO_REG_A(gpio) CCI_REG8(0x2be + (gpio) * 3) +#define MAX96717_GPIO_OUT BIT(4) +#define MAX96717_GPIO_IN BIT(3) +#define MAX96717_GPIO_RX_EN BIT(2) +#define MAX96717_GPIO_TX_EN BIT(1) +#define MAX96717_GPIO_OUT_DIS BIT(0) + +/* FRONTTOP */ +/* MAX96717 only have CSI port 'B' */ +#define MAX96717_FRONTOP0 CCI_REG8(0x308) +#define MAX96717_START_PORT_B BIT(5) + +/* MIPI_RX */ +#define MAX96717_MIPI_RX1 CCI_REG8(0x331) +#define MAX96717_MIPI_LANES_CNT GENMASK(5, 4) +#define MAX96717_MIPI_RX2 CCI_REG8(0x332) /* phy1 Lanes map */ +#define MAX96717_PHY2_LANES_MAP GENMASK(7, 4) +#define MAX96717_MIPI_RX3 CCI_REG8(0x333) /* phy2 Lanes map */ +#define MAX96717_PHY1_LANES_MAP GENMASK(3, 0) +#define MAX96717_MIPI_RX4 CCI_REG8(0x334) /* phy1 lane polarities */ +#define MAX96717_PHY1_LANES_POL GENMASK(6, 4) +#define MAX96717_MIPI_RX5 CCI_REG8(0x335) /* phy2 lane polarities */ +#define MAX96717_PHY2_LANES_POL GENMASK(2, 0) + +/* MIPI_RX_EXT */ +#define MAX96717_MIPI_RX_EXT11 CCI_REG8(0x383) +#define MAX96717_TUN_MODE BIT(7) + +/* REF_VTG */ +#define REF_VTG0 CCI_REG8(0x3f0) +#define REFGEN_PREDEF_EN BIT(6) +#define REFGEN_PREDEF_FREQ_MASK GENMASK(5, 4) +#define REFGEN_PREDEF_FREQ_ALT BIT(3) +#define REFGEN_RST BIT(1) +#define REFGEN_EN BIT(0) + +/* MISC */ +#define PIO_SLEW_1 CCI_REG8(0x570) + +struct max96717_priv { + struct i2c_client *client; + struct regmap *regmap; + struct i2c_mux_core *mux; + struct v4l2_mbus_config_mipi_csi2 mipi_csi2; + struct v4l2_subdev sd; + struct media_pad pads[MAX96717_PORTS]; + struct v4l2_async_notifier notifier; + struct v4l2_subdev *source_sd; + u16 source_sd_pad; + u64 enabled_source_streams; + u8 pll_predef_index; + struct clk_hw clk_hw; + struct gpio_chip gpio_chip; +}; + +static inline struct max96717_priv *sd_to_max96717(struct v4l2_subdev *sd) +{ + return container_of(sd, struct max96717_priv, sd); +} + +static inline struct max96717_priv *clk_hw_to_max96717(struct clk_hw *hw) +{ + return container_of(hw, struct max96717_priv, clk_hw); +} + +static int max96717_i2c_mux_select(struct i2c_mux_core *mux, u32 chan) +{ + return 0; +} + +static int max96717_i2c_mux_init(struct max96717_priv *priv) +{ + priv->mux = i2c_mux_alloc(priv->client->adapter, &priv->client->dev, + 1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE, + max96717_i2c_mux_select, NULL); + if (!priv->mux) + return -ENOMEM; + + return i2c_mux_add_adapter(priv->mux, 0, 0, 0); +} + +static inline int max96717_start_csi(struct max96717_priv *priv, bool start) +{ + return cci_update_bits(priv->regmap, MAX96717_FRONTOP0, + MAX96717_START_PORT_B, + start ? MAX96717_START_PORT_B : 0, NULL); +} + +static int max96717_gpiochip_get(struct gpio_chip *gpiochip, + unsigned int offset) +{ + struct max96717_priv *priv = gpiochip_get_data(gpiochip); + u64 val; + int ret; + + ret = cci_read(priv->regmap, MAX96717_GPIO_REG_A(offset), + &val, NULL); + if (ret) + return ret; + + if (val & MAX96717_GPIO_OUT_DIS) + return !!(val & MAX96717_GPIO_IN); + else + return !!(val & MAX96717_GPIO_OUT); +} + +static void max96717_gpiochip_set(struct gpio_chip *gpiochip, + unsigned int offset, int value) +{ + struct max96717_priv *priv = gpiochip_get_data(gpiochip); + + cci_update_bits(priv->regmap, MAX96717_GPIO_REG_A(offset), + MAX96717_GPIO_OUT, MAX96717_GPIO_OUT, NULL); +} + +static int max96717_gpio_get_direction(struct gpio_chip *gpiochip, + unsigned int offset) +{ + struct max96717_priv *priv = gpiochip_get_data(gpiochip); + u64 val; + int ret; + + ret = cci_read(priv->regmap, MAX96717_GPIO_REG_A(offset), &val, NULL); + if (ret < 0) + return ret; + + return !!(val & MAX96717_GPIO_OUT_DIS); +} + +static int max96717_gpio_direction_out(struct gpio_chip *gpiochip, + unsigned int offset, int value) +{ + struct max96717_priv *priv = gpiochip_get_data(gpiochip); + + return cci_update_bits(priv->regmap, MAX96717_GPIO_REG_A(offset), + MAX96717_GPIO_OUT_DIS | MAX96717_GPIO_OUT, + value ? MAX96717_GPIO_OUT : 0, NULL); +} + +static int max96717_gpio_direction_in(struct gpio_chip *gpiochip, + unsigned int offset) +{ + struct max96717_priv *priv = gpiochip_get_data(gpiochip); + + return cci_update_bits(priv->regmap, MAX96717_GPIO_REG_A(offset), + MAX96717_GPIO_OUT_DIS, MAX96717_GPIO_OUT_DIS, + NULL); +} + +static int max96717_gpiochip_probe(struct max96717_priv *priv) +{ + struct device *dev = &priv->client->dev; + struct gpio_chip *gc = &priv->gpio_chip; + int i, ret = 0; + + gc->label = dev_name(dev); + gc->parent = dev; + gc->owner = THIS_MODULE; + gc->ngpio = MAX96717_NUM_GPIO; + gc->base = -1; + gc->can_sleep = true; + gc->get_direction = max96717_gpio_get_direction; + gc->direction_input = max96717_gpio_direction_in; + gc->direction_output = max96717_gpio_direction_out; + gc->set = max96717_gpiochip_set; + gc->get = max96717_gpiochip_get; + gc->of_gpio_n_cells = 2; + + /* Disable GPIO forwarding */ + for (i = 0; i < gc->ngpio; i++) + cci_update_bits(priv->regmap, MAX96717_GPIO_REG_A(i), + MAX96717_GPIO_RX_EN | MAX96717_GPIO_TX_EN, + 0, &ret); + + if (ret) + return ret; + + ret = devm_gpiochip_add_data(dev, gc, priv); + if (ret) { + dev_err(dev, "Unable to create gpio_chip\n"); + return ret; + } + + return 0; +} + +static int _max96717_set_routing(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state, + struct v4l2_subdev_krouting *routing) +{ + static const struct v4l2_mbus_framefmt format = { + .width = 1280, + .height = 1080, + .code = MEDIA_BUS_FMT_Y8_1X8, + .field = V4L2_FIELD_NONE, + }; + int ret; + + 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 max96717_set_routing(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state, + enum v4l2_subdev_format_whence which, + struct v4l2_subdev_krouting *routing) +{ + struct max96717_priv *priv = sd_to_max96717(sd); + + if (which == V4L2_SUBDEV_FORMAT_ACTIVE && priv->enabled_source_streams) + return -EBUSY; + + return _max96717_set_routing(sd, state, routing); +} + +static int max96717_set_fmt(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state, + struct v4l2_subdev_format *format) +{ + struct max96717_priv *priv = sd_to_max96717(sd); + struct v4l2_mbus_framefmt *fmt; + u64 stream_source_mask; + + if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE && + priv->enabled_source_streams) + return -EBUSY; + + /* No transcoding, source and sink formats must match. */ + if (format->pad == MAX96717_PAD_SOURCE) + return v4l2_subdev_get_fmt(sd, state, format); + + /* Set sink format */ + fmt = v4l2_subdev_state_get_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; + + stream_source_mask = BIT(format->stream); + + return v4l2_subdev_state_xlate_streams(state, MAX96717_PAD_SOURCE, + MAX96717_PAD_SINK, + &stream_source_mask); +} + +static int max96717_init_state(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state) +{ + struct v4l2_subdev_route routes[] = { + { + .sink_pad = MAX96717_PAD_SINK, + .sink_stream = 0, + .source_pad = MAX96717_PAD_SOURCE, + .source_stream = 0, + .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE, + }, + }; + struct v4l2_subdev_krouting routing = { + .num_routes = ARRAY_SIZE(routes), + .routes = routes, + }; + + return _max96717_set_routing(sd, state, &routing); +} + +static bool max96717_pipe_pclkdet(struct max96717_priv *priv) +{ + u64 val = 0; + + cci_read(priv->regmap, MAX96717_VIDEO_TX2, &val, NULL); + + return val & MAX96717_VIDEO_PCLKDET; +} + +static int max96717_log_status(struct v4l2_subdev *sd) +{ + struct max96717_priv *priv = sd_to_max96717(sd); + struct device *dev = &priv->client->dev; + + dev_info(dev, "Serializer: max96717\n"); + dev_info(dev, "Pipe: pclkdet:%d\n", max96717_pipe_pclkdet(priv)); + + return 0; +} + +static int max96717_enable_streams(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state, u32 pad, + u64 streams_mask) +{ + struct max96717_priv *priv = sd_to_max96717(sd); + struct device *dev = &priv->client->dev; + u64 sink_streams; + int ret; + + sink_streams = v4l2_subdev_state_xlate_streams(state, + MAX96717_PAD_SOURCE, + MAX96717_PAD_SINK, + &streams_mask); + + if (!priv->enabled_source_streams) + max96717_start_csi(priv, true); + + ret = v4l2_subdev_enable_streams(priv->source_sd, priv->source_sd_pad, + sink_streams); + if (ret) { + dev_err(dev, "Fail to start streams:%llu on remote subdev\n", + sink_streams); + goto stop_csi; + } + + priv->enabled_source_streams |= streams_mask; + + return 0; + +stop_csi: + if (!priv->enabled_source_streams) + max96717_start_csi(priv, false); + return ret; +} + +static int max96717_disable_streams(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state, u32 pad, + u64 streams_mask) +{ + struct max96717_priv *priv = sd_to_max96717(sd); + u64 sink_streams; + int ret; + + sink_streams = v4l2_subdev_state_xlate_streams(state, + MAX96717_PAD_SOURCE, + MAX96717_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; + + if (!priv->enabled_source_streams) + max96717_start_csi(priv, false); + + return 0; +} + +static const struct v4l2_subdev_pad_ops max96717_pad_ops = { + .enable_streams = max96717_enable_streams, + .disable_streams = max96717_disable_streams, + .set_routing = max96717_set_routing, + .get_fmt = v4l2_subdev_get_fmt, + .set_fmt = max96717_set_fmt, +}; + +static const struct v4l2_subdev_core_ops max96717_subdev_core_ops = { + .log_status = max96717_log_status, +}; + +static const struct v4l2_subdev_internal_ops max96717_internal_ops = { + .init_state = max96717_init_state, +}; + +static const struct v4l2_subdev_ops max96717_subdev_ops = { + .core = &max96717_subdev_core_ops, + .pad = &max96717_pad_ops, +}; + +static const struct media_entity_operations max96717_entity_ops = { + .link_validate = v4l2_subdev_link_validate, +}; + +static int max96717_notify_bound(struct v4l2_async_notifier *notifier, + struct v4l2_subdev *source_subdev, + struct v4l2_async_connection *asd) +{ + struct max96717_priv *priv = sd_to_max96717(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, 0, + 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 max96717_notify_ops = { + .bound = max96717_notify_bound, +}; + +static int max96717_v4l2_notifier_register(struct max96717_priv *priv) +{ + struct device *dev = &priv->client->dev; + struct v4l2_async_connection *asd; + struct fwnode_handle *ep_fwnode; + int ret; + + ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), + MAX96717_PAD_SINK, 0, 0); + if (!ep_fwnode) { + dev_err(dev, "No graph endpoint\n"); + return -ENODEV; + } + + v4l2_async_subdev_nf_init(&priv->notifier, &priv->sd); + + asd = v4l2_async_nf_add_fwnode_remote(&priv->notifier, ep_fwnode, + struct v4l2_async_connection); + + 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 = &max96717_notify_ops; + + ret = v4l2_async_nf_register(&priv->notifier); + if (ret) { + dev_err(dev, "Failed to register subdev_notifier"); + v4l2_async_nf_cleanup(&priv->notifier); + return ret; + } + + return 0; +} + +static int max96717_subdev_init(struct max96717_priv *priv) +{ + struct device *dev = &priv->client->dev; + int ret; + + v4l2_i2c_subdev_init(&priv->sd, priv->client, &max96717_subdev_ops); + priv->sd.internal_ops = &max96717_internal_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 = &max96717_entity_ops; + + priv->pads[MAX96717_PAD_SINK].flags = MEDIA_PAD_FL_SINK; + priv->pads[MAX96717_PAD_SOURCE].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"); + + ret = v4l2_subdev_init_finalize(&priv->sd); + if (ret) { + dev_err_probe(dev, ret, + "v4l2 subdev init finalized failed\n"); + goto err_entity_cleanup; + } + ret = max96717_v4l2_notifier_register(priv); + if (ret) { + dev_err_probe(dev, ret, + "v4l2 subdev notifier register failed\n"); + goto err_free_state; + } + + 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: + v4l2_async_nf_unregister(&priv->notifier); + v4l2_async_nf_cleanup(&priv->notifier); +err_free_state: + v4l2_subdev_cleanup(&priv->sd); +err_entity_cleanup: + media_entity_cleanup(&priv->sd.entity); + + return ret; +} + +static void max96717_subdev_uninit(struct max96717_priv *priv) +{ + v4l2_async_unregister_subdev(&priv->sd); + v4l2_async_nf_unregister(&priv->notifier); + v4l2_async_nf_cleanup(&priv->notifier); + v4l2_subdev_cleanup(&priv->sd); + media_entity_cleanup(&priv->sd.entity); +} + +struct max96717_pll_predef_freq { + unsigned long freq; + bool is_alt; + u8 val; +}; + +static const struct max96717_pll_predef_freq max96717_predef_freqs[] = { + { 13500000, true, 0 }, { 19200000, false, 0 }, + { 24000000, true, 1 }, { 27000000, false, 1 }, + { 37125000, false, 2 }, { 74250000, false, 3 }, +}; + +static unsigned long +max96717_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + struct max96717_priv *priv = clk_hw_to_max96717(hw); + + return max96717_predef_freqs[priv->pll_predef_index].freq; +} + +static unsigned int max96717_clk_find_best_index(struct max96717_priv *priv, + unsigned long rate) +{ + unsigned int i, idx; + unsigned long diff_new, diff_old; + + diff_old = U32_MAX; + idx = 0; + + for (i = 0; i < ARRAY_SIZE(max96717_predef_freqs); i++) { + diff_new = abs(rate - max96717_predef_freqs[i].freq); + if (diff_new < diff_old) { + diff_old = diff_new; + idx = i; + } + } + + return idx; +} + +static long max96717_clk_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + struct max96717_priv *priv = clk_hw_to_max96717(hw); + struct device *dev = &priv->client->dev; + unsigned int idx; + + idx = max96717_clk_find_best_index(priv, rate); + + if (rate != max96717_predef_freqs[idx].freq) { + dev_warn(dev, "Request CLK freq:%lu, found CLK freq:%lu\n", + rate, max96717_predef_freqs[idx].freq); + } + + return max96717_predef_freqs[idx].freq; +} + +static int max96717_clk_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct max96717_priv *priv = clk_hw_to_max96717(hw); + unsigned int val, idx; + int ret = 0; + + idx = max96717_clk_find_best_index(priv, rate); + + val = FIELD_PREP(REFGEN_PREDEF_FREQ_MASK, + max96717_predef_freqs[idx].val); + + if (max96717_predef_freqs[idx].is_alt) + val |= REFGEN_PREDEF_FREQ_ALT; + + val |= REFGEN_RST | REFGEN_PREDEF_EN; + + cci_write(priv->regmap, REF_VTG0, val, &ret); + cci_update_bits(priv->regmap, REF_VTG0, REFGEN_RST | REFGEN_EN, + REFGEN_EN, &ret); + if (ret) + return ret; + + priv->pll_predef_index = idx; + + return 0; +} + +static int max96717_clk_prepare(struct clk_hw *hw) +{ + struct max96717_priv *priv = clk_hw_to_max96717(hw); + + return cci_update_bits(priv->regmap, MAX96717_REG6, RCLKEN, + RCLKEN, NULL); +} + +static void max96717_clk_unprepare(struct clk_hw *hw) +{ + struct max96717_priv *priv = clk_hw_to_max96717(hw); + + cci_update_bits(priv->regmap, MAX96717_REG6, RCLKEN, 0, NULL); +} + +static const struct clk_ops max96717_clk_ops = { + .prepare = max96717_clk_prepare, + .unprepare = max96717_clk_unprepare, + .set_rate = max96717_clk_set_rate, + .recalc_rate = max96717_clk_recalc_rate, + .round_rate = max96717_clk_round_rate, +}; + +static int max96717_register_clkout(struct max96717_priv *priv) +{ + struct device *dev = &priv->client->dev; + struct clk_init_data init = { .ops = &max96717_clk_ops }; + int ret; + + init.name = kasprintf(GFP_KERNEL, "max96717.%s.clk_out", + dev_name(dev)); + if (!init.name) + return -ENOMEM; + + /* RCLKSEL Reference PLL output */ + ret = cci_update_bits(priv->regmap, MAX96717_REG3, MAX96717_RCLKSEL, + MAX96717_RCLKSEL, NULL); + /* MFP4 fastest slew rate */ + cci_update_bits(priv->regmap, PIO_SLEW_1, BIT(5) | BIT(4), 0, &ret); + if (ret) + goto free_init_name; + + priv->clk_hw.init = &init; + + /* Initialize to 24 MHz */ + ret = max96717_clk_set_rate(&priv->clk_hw, + MAX96717_DEFAULT_CLKOUT_RATE, 0); + if (ret < 0) + goto free_init_name; + + ret = devm_clk_hw_register(dev, &priv->clk_hw); + kfree(init.name); + if (ret) + return dev_err_probe(dev, ret, "Cannot register clock HW\n"); + + ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, + &priv->clk_hw); + if (ret) + return dev_err_probe(dev, ret, + "Cannot add OF clock provider\n"); + + return 0; + +free_init_name: + kfree(init.name); + return ret; +} + +static int max96717_init_csi_lanes(struct max96717_priv *priv) +{ + struct v4l2_mbus_config_mipi_csi2 *mipi = &priv->mipi_csi2; + unsigned long lanes_used = 0; + unsigned int nlanes, lane, val = 0; + int ret; + + nlanes = mipi->num_data_lanes; + + ret = cci_update_bits(priv->regmap, MAX96717_MIPI_RX1, + MAX96717_MIPI_LANES_CNT, + FIELD_PREP(MAX96717_MIPI_LANES_CNT, + nlanes - 1), NULL); + + /* lanes polarity */ + for (lane = 0; lane < nlanes + 1; lane++) { + if (!mipi->lane_polarities[lane]) + continue; + /* Clock lane */ + if (lane == 0) + val |= BIT(2); + else if (lane < 3) + val |= BIT(lane - 1); + else + val |= BIT(lane); + } + + cci_update_bits(priv->regmap, MAX96717_MIPI_RX5, + MAX96717_PHY2_LANES_POL, + FIELD_PREP(MAX96717_PHY2_LANES_POL, val), &ret); + + cci_update_bits(priv->regmap, MAX96717_MIPI_RX4, + MAX96717_PHY1_LANES_POL, + FIELD_PREP(MAX96717_PHY1_LANES_POL, + val >> 3), &ret); + /* lanes mapping */ + for (lane = 0, val = 0; lane < nlanes; lane++) { + val |= (mipi->data_lanes[lane] - 1) << (lane * 2); + lanes_used |= BIT(mipi->data_lanes[lane] - 1); + } + + /* + * Unused lanes need to be mapped as well to not have + * the same lanes mapped twice. + */ + for (; lane < 4; lane++) { + unsigned int idx = find_first_zero_bit(&lanes_used, 4); + + val |= idx << (lane * 2); + lanes_used |= BIT(idx); + } + + cci_update_bits(priv->regmap, MAX96717_MIPI_RX3, + MAX96717_PHY1_LANES_MAP, + FIELD_PREP(MAX96717_PHY1_LANES_MAP, val), &ret); + + return cci_update_bits(priv->regmap, MAX96717_MIPI_RX2, + MAX96717_PHY2_LANES_MAP, + FIELD_PREP(MAX96717_PHY2_LANES_MAP, val >> 4), + &ret); +} + +static int max96717_hw_init(struct max96717_priv *priv) +{ + struct device *dev = &priv->client->dev; + u64 dev_id, val; + int ret; + + ret = cci_read(priv->regmap, MAX96717_DEV_ID, &dev_id, NULL); + if (ret) + return dev_err_probe(dev, ret, + "Fail to read the device id\n"); + + if (dev_id != MAX96717_DEVICE_ID && dev_id != MAX96717F_DEVICE_ID) + return dev_err_probe(dev, -EOPNOTSUPP, + "Unsupported device id got %x\n", (u8)dev_id); + + ret = cci_read(priv->regmap, MAX96717_DEV_REV, &val, NULL); + if (ret) + return dev_err_probe(dev, ret, + "Fail to read device revision"); + + dev_dbg(dev, "Found %x (rev %lx)\n", (u8)dev_id, + (u8)val & MAX96717_DEV_REV_MASK); + + ret = cci_read(priv->regmap, MAX96717_MIPI_RX_EXT11, &val, NULL); + if (ret) + return dev_err_probe(dev, ret, + "Fail to read mipi rx extension"); + + if (!(val & MAX96717_TUN_MODE)) + return dev_err_probe(dev, -EOPNOTSUPP, + "Only supporting tunnel mode"); + + return max96717_init_csi_lanes(priv); +} + +static int max96717_parse_dt(struct max96717_priv *priv) +{ + struct device *dev = &priv->client->dev; + struct v4l2_fwnode_endpoint vep = { + .bus_type = V4L2_MBUS_CSI2_DPHY + }; + struct fwnode_handle *ep_fwnode; + unsigned char num_data_lanes; + int ret; + + ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), + MAX96717_PAD_SINK, 0, 0); + if (!ep_fwnode) + return dev_err_probe(dev, -ENOENT, "no endpoint found\n"); + + ret = v4l2_fwnode_endpoint_parse(ep_fwnode, &vep); + + fwnode_handle_put(ep_fwnode); + + if (ret < 0) + return dev_err_probe(dev, ret, "Failed to parse sink endpoint"); + + num_data_lanes = vep.bus.mipi_csi2.num_data_lanes; + if (num_data_lanes < 1 || num_data_lanes > 4) + return dev_err_probe(dev, -EINVAL, + "Invalid data lanes must be 1 to 4\n"); + + memcpy(&priv->mipi_csi2, &vep.bus.mipi_csi2, sizeof(priv->mipi_csi2)); + + return 0; +} + +static int max96717_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct max96717_priv *priv; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->client = client; + priv->regmap = devm_cci_regmap_init_i2c(client, 16); + if (IS_ERR(priv->regmap)) { + ret = PTR_ERR(priv->regmap); + return dev_err_probe(dev, ret, "Failed to init regmap\n"); + } + + ret = max96717_parse_dt(priv); + if (ret) + return dev_err_probe(dev, ret, "Failed to parse the dt\n"); + + ret = max96717_hw_init(priv); + if (ret) + return dev_err_probe(dev, ret, + "Failed to initialize the hardware\n"); + + ret = max96717_gpiochip_probe(priv); + if (ret) + return dev_err_probe(&client->dev, ret, + "Failed to init gpiochip\n"); + + ret = max96717_register_clkout(priv); + if (ret) + return dev_err_probe(dev, ret, "Failed to register clkout\n"); + + ret = max96717_subdev_init(priv); + if (ret) + return dev_err_probe(dev, ret, + "Failed to initialize v4l2 subdev\n"); + + ret = max96717_i2c_mux_init(priv); + if (ret) { + dev_err_probe(dev, ret, "failed to add remote i2c adapter\n"); + max96717_subdev_uninit(priv); + } + + return ret; +} + +static void max96717_remove(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct max96717_priv *priv = sd_to_max96717(sd); + + max96717_subdev_uninit(priv); + i2c_mux_del_adapters(priv->mux); +} + +static const struct of_device_id max96717_of_ids[] = { + { .compatible = "maxim,max96717f" }, + { } +}; +MODULE_DEVICE_TABLE(of, max96717_of_ids); + +static struct i2c_driver max96717_i2c_driver = { + .driver = { + .name = "max96717", + .of_match_table = max96717_of_ids, + }, + .probe = max96717_probe, + .remove = max96717_remove, +}; + +module_i2c_driver(max96717_i2c_driver); + +MODULE_DESCRIPTION("Maxim GMSL2 MAX96717 Serializer Driver"); +MODULE_AUTHOR("Julien Massot "); +MODULE_LICENSE("GPL"); -- 2.44.0