[PATCH v10 6/8] media: i2c: add DS90UB960 driver

[Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>]

Add driver for TI DS90UB960 FPD-Link III Deserializer.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 MAINTAINERS                   |    8 +
 drivers/media/i2c/Kconfig     |   21 +
 drivers/media/i2c/Makefile    |    1 +
 drivers/media/i2c/ds90ub960.c | 4172 +++++++++++++++++++++++++++++++++
 include/media/i2c/ds90ub9xx.h |   22 +
 5 files changed, 4224 insertions(+)
 create mode 100644 drivers/media/i2c/ds90ub960.c
 create mode 100644 include/media/i2c/ds90ub9xx.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 375e13ee05a2..863c21b12234 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20935,6 +20935,14 @@ F:	drivers/misc/tifm*
 F:	drivers/mmc/host/tifm_sd.c
 F:	include/linux/tifm.h
 
+TI FPD-LINK DRIVERS
+M:	Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
+L:	linux-media@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/media/i2c/ti,ds90*
+F:	drivers/media/i2c/ds90*
+F:	include/media/i2c/ds90*
+
 TI KEYSTONE MULTICORE NAVIGATOR DRIVERS
 M:	Nishanth Menon <nm@ti.com>
 M:	Santosh Shilimkar <ssantosh@kernel.org>
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index c3d5952ca27e..81ebf909a522 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -1677,4 +1677,25 @@ config VIDEO_THS7303
 
 endmenu
 
+#
+# Video serializers and deserializers (e.g. FPD-Link)
+#
+
+menu "Video serializers and deserializers"
+
+config VIDEO_DS90UB960
+	tristate "TI FPD-Link III/IV Deserializers"
+	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 DS90UB960
+	  FPD-Link III Deserializer and DS90UB9702 FPD-Link IV Deserializer.
+
+endmenu
+
 endif # VIDEO_DEV
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 4f5e9d9cee85..33f29695b846 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_VIDEO_CS3308) += cs3308.o
 obj-$(CONFIG_VIDEO_CS5345) += cs5345.o
 obj-$(CONFIG_VIDEO_CS53L32A) += cs53l32a.o
 obj-$(CONFIG_VIDEO_CX25840) += cx25840/
+obj-$(CONFIG_VIDEO_DS90UB960) += ds90ub960.o
 obj-$(CONFIG_VIDEO_DW9714) += dw9714.o
 obj-$(CONFIG_VIDEO_DW9768) += dw9768.o
 obj-$(CONFIG_VIDEO_DW9807_VCM) += dw9807-vcm.o
diff --git a/drivers/media/i2c/ds90ub960.c b/drivers/media/i2c/ds90ub960.c
new file mode 100644
index 000000000000..c9dfe2ea0dfb
--- /dev/null
+++ b/drivers/media/i2c/ds90ub960.c
@@ -0,0 +1,4172 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the Texas Instruments DS90UB960-Q1 video deserializer
+ *
+ * Copyright (c) 2019 Luca Ceresoli <luca@lucaceresoli.net>
+ * Copyright (c) 2023 Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
+ */
+
+/*
+ * (Possible) TODOs:
+ *
+ * - PM for serializer and remote peripherals. We need to manage:
+ *   - VPOC
+ *     - Power domain? Regulator? Somehow any remote device should be able to
+ *       cause the VPOC to be turned on.
+ *   - Link between the deserializer and the serializer
+ *     - Related to VPOC management. We probably always want to turn on the VPOC
+ *       and then enable the link.
+ *   - Serializer's services: i2c, gpios, power
+ *     - The serializer needs to resume before the remote peripherals can
+ *       e.g. use the i2c.
+ *     - How to handle gpios? Reserving a gpio essentially keeps the provider
+ *       (serializer) always powered on.
+ * - Do we need a new bus for the FPD-Link? At the moment the serializers
+ *   are children of the same i2c-adapter where the deserializer resides.
+ * - i2c-atr could be made embeddable instead of allocatable.
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/fwnode.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c-atr.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#include <media/i2c/ds90ub9xx.h>
+#include <media/mipi-csi2.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+
+#define MHZ(v) ((u32)((v) * 1000000U))
+
+#define UB960_POLL_TIME_MS	500
+
+#define UB960_MAX_RX_NPORTS	4
+#define UB960_MAX_TX_NPORTS	2
+#define UB960_MAX_NPORTS	(UB960_MAX_RX_NPORTS + UB960_MAX_TX_NPORTS)
+
+#define UB960_MAX_PORT_ALIASES	8
+
+#define UB960_NUM_BC_GPIOS		4
+
+/*
+ * Register map
+ *
+ * 0x00-0x32   Shared (UB960_SR)
+ * 0x33-0x3a   CSI-2 TX (per-port paged on DS90UB960, shared on 954) (UB960_TR)
+ * 0x4c        Shared (UB960_SR)
+ * 0x4d-0x7f   FPD-Link RX, per-port paged (UB960_RR)
+ * 0xb0-0xbf   Shared (UB960_SR)
+ * 0xd0-0xdf   FPD-Link RX, per-port paged (UB960_RR)
+ * 0xf0-0xf5   Shared (UB960_SR)
+ * 0xf8-0xfb   Shared (UB960_SR)
+ * All others  Reserved
+ *
+ * Register prefixes:
+ * UB960_SR_* = Shared register
+ * UB960_RR_* = FPD-Link RX, per-port paged register
+ * UB960_TR_* = CSI-2 TX, per-port paged register
+ * UB960_XR_* = Reserved register
+ * UB960_IR_* = Indirect register
+ */
+
+#define UB960_SR_I2C_DEV_ID			0x00
+#define UB960_SR_RESET				0x01
+#define UB960_SR_RESET_DIGITAL_RESET1		BIT(1)
+#define UB960_SR_RESET_DIGITAL_RESET0		BIT(0)
+#define UB960_SR_RESET_GPIO_LOCK_RELEASE	BIT(5)
+
+#define UB960_SR_GEN_CONFIG			0x02
+#define UB960_SR_REV_MASK			0x03
+#define UB960_SR_DEVICE_STS			0x04
+#define UB960_SR_PAR_ERR_THOLD_HI		0x05
+#define UB960_SR_PAR_ERR_THOLD_LO		0x06
+#define UB960_SR_BCC_WDOG_CTL			0x07
+#define UB960_SR_I2C_CTL1			0x08
+#define UB960_SR_I2C_CTL2			0x09
+#define UB960_SR_SCL_HIGH_TIME			0x0a
+#define UB960_SR_SCL_LOW_TIME			0x0b
+#define UB960_SR_RX_PORT_CTL			0x0c
+#define UB960_SR_IO_CTL				0x0d
+#define UB960_SR_GPIO_PIN_STS			0x0e
+#define UB960_SR_GPIO_INPUT_CTL			0x0f
+#define UB960_SR_GPIO_PIN_CTL(n)		(0x10 + (n)) /* n < UB960_NUM_GPIOS */
+#define UB960_SR_GPIO_PIN_CTL_GPIO_OUT_SEL		5
+#define UB960_SR_GPIO_PIN_CTL_GPIO_OUT_SRC_SHIFT	2
+#define UB960_SR_GPIO_PIN_CTL_GPIO_OUT_EN		BIT(0)
+
+#define UB960_SR_FS_CTL				0x18
+#define UB960_SR_FS_HIGH_TIME_1			0x19
+#define UB960_SR_FS_HIGH_TIME_0			0x1a
+#define UB960_SR_FS_LOW_TIME_1			0x1b
+#define UB960_SR_FS_LOW_TIME_0			0x1c
+#define UB960_SR_MAX_FRM_HI			0x1d
+#define UB960_SR_MAX_FRM_LO			0x1e
+#define UB960_SR_CSI_PLL_CTL			0x1f
+
+#define UB960_SR_FWD_CTL1			0x20
+#define UB960_SR_FWD_CTL1_PORT_DIS(n)		BIT((n) + 4)
+
+#define UB960_SR_FWD_CTL2			0x21
+#define UB960_SR_FWD_STS			0x22
+
+#define UB960_SR_INTERRUPT_CTL			0x23
+#define UB960_SR_INTERRUPT_CTL_INT_EN		BIT(7)
+#define UB960_SR_INTERRUPT_CTL_IE_CSI_TX0	BIT(4)
+#define UB960_SR_INTERRUPT_CTL_IE_RX(n)		BIT((n)) /* rxport[n] IRQ */
+
+#define UB960_SR_INTERRUPT_STS			0x24
+#define UB960_SR_INTERRUPT_STS_INT		BIT(7)
+#define UB960_SR_INTERRUPT_STS_IS_CSI_TX(n)	BIT(4 + (n)) /* txport[n] IRQ */
+#define UB960_SR_INTERRUPT_STS_IS_RX(n)		BIT((n)) /* rxport[n] IRQ */
+
+#define UB960_SR_TS_CONFIG			0x25
+#define UB960_SR_TS_CONTROL			0x26
+#define UB960_SR_TS_LINE_HI			0x27
+#define UB960_SR_TS_LINE_LO			0x28
+#define UB960_SR_TS_STATUS			0x29
+#define UB960_SR_TIMESTAMP_P0_HI		0x2a
+#define UB960_SR_TIMESTAMP_P0_LO		0x2b
+#define UB960_SR_TIMESTAMP_P1_HI		0x2c
+#define UB960_SR_TIMESTAMP_P1_LO		0x2d
+
+#define UB960_SR_CSI_PORT_SEL			0x32
+
+#define UB960_TR_CSI_CTL			0x33
+#define UB960_TR_CSI_CTL_CSI_CAL_EN		BIT(6)
+#define UB960_TR_CSI_CTL_CSI_ENABLE		BIT(0)
+
+#define UB960_TR_CSI_CTL2			0x34
+#define UB960_TR_CSI_STS			0x35
+#define UB960_TR_CSI_TX_ICR			0x36
+
+#define UB960_TR_CSI_TX_ISR			0x37
+#define UB960_TR_CSI_TX_ISR_IS_CSI_SYNC_ERROR	BIT(3)
+#define UB960_TR_CSI_TX_ISR_IS_CSI_PASS_ERROR	BIT(1)
+
+#define UB960_TR_CSI_TEST_CTL			0x38
+#define UB960_TR_CSI_TEST_PATT_HI		0x39
+#define UB960_TR_CSI_TEST_PATT_LO		0x3a
+
+#define UB960_XR_SFILTER_CFG			0x41
+#define UB960_XR_SFILTER_CFG_SFILTER_MAX_SHIFT	4
+#define UB960_XR_SFILTER_CFG_SFILTER_MIN_SHIFT	0
+
+#define UB960_XR_AEQ_CTL1			0x42
+#define UB960_XR_AEQ_CTL1_AEQ_ERR_CTL_FPD_CLK	BIT(6)
+#define UB960_XR_AEQ_CTL1_AEQ_ERR_CTL_ENCODING	BIT(5)
+#define UB960_XR_AEQ_CTL1_AEQ_ERR_CTL_PARITY	BIT(4)
+#define UB960_XR_AEQ_CTL1_AEQ_ERR_CTL_MASK        \
+	(UB960_XR_AEQ_CTL1_AEQ_ERR_CTL_FPD_CLK |  \
+	 UB960_XR_AEQ_CTL1_AEQ_ERR_CTL_ENCODING | \
+	 UB960_XR_AEQ_CTL1_AEQ_ERR_CTL_PARITY)
+#define UB960_XR_AEQ_CTL1_AEQ_SFILTER_EN	BIT(0)
+
+#define UB960_XR_AEQ_ERR_THOLD			0x43
+
+#define UB960_RR_BCC_ERR_CTL			0x46
+#define UB960_RR_BCC_STATUS			0x47
+#define UB960_RR_BCC_STATUS_SEQ_ERROR		BIT(5)
+#define UB960_RR_BCC_STATUS_MASTER_ERR		BIT(4)
+#define UB960_RR_BCC_STATUS_MASTER_TO		BIT(3)
+#define UB960_RR_BCC_STATUS_SLAVE_ERR		BIT(2)
+#define UB960_RR_BCC_STATUS_SLAVE_TO		BIT(1)
+#define UB960_RR_BCC_STATUS_RESP_ERR		BIT(0)
+#define UB960_RR_BCC_STATUS_ERROR_MASK                                    \
+	(UB960_RR_BCC_STATUS_SEQ_ERROR | UB960_RR_BCC_STATUS_MASTER_ERR | \
+	 UB960_RR_BCC_STATUS_MASTER_TO | UB960_RR_BCC_STATUS_SLAVE_ERR |  \
+	 UB960_RR_BCC_STATUS_SLAVE_TO | UB960_RR_BCC_STATUS_RESP_ERR)
+
+#define UB960_RR_FPD3_CAP			0x4a
+#define UB960_RR_RAW_EMBED_DTYPE		0x4b
+#define UB960_RR_RAW_EMBED_DTYPE_LINES_SHIFT	6
+
+#define UB960_SR_FPD3_PORT_SEL			0x4c
+
+#define UB960_RR_RX_PORT_STS1			0x4d
+#define UB960_RR_RX_PORT_STS1_BCC_CRC_ERROR	BIT(5)
+#define UB960_RR_RX_PORT_STS1_LOCK_STS_CHG	BIT(4)
+#define UB960_RR_RX_PORT_STS1_BCC_SEQ_ERROR	BIT(3)
+#define UB960_RR_RX_PORT_STS1_PARITY_ERROR	BIT(2)
+#define UB960_RR_RX_PORT_STS1_PORT_PASS		BIT(1)
+#define UB960_RR_RX_PORT_STS1_LOCK_STS		BIT(0)
+#define UB960_RR_RX_PORT_STS1_ERROR_MASK       \
+	(UB960_RR_RX_PORT_STS1_BCC_CRC_ERROR | \
+	 UB960_RR_RX_PORT_STS1_BCC_SEQ_ERROR | \
+	 UB960_RR_RX_PORT_STS1_PARITY_ERROR)
+
+#define UB960_RR_RX_PORT_STS2			0x4e
+#define UB960_RR_RX_PORT_STS2_LINE_LEN_UNSTABLE	BIT(7)
+#define UB960_RR_RX_PORT_STS2_LINE_LEN_CHG	BIT(6)
+#define UB960_RR_RX_PORT_STS2_FPD3_ENCODE_ERROR	BIT(5)
+#define UB960_RR_RX_PORT_STS2_BUFFER_ERROR	BIT(4)
+#define UB960_RR_RX_PORT_STS2_CSI_ERROR		BIT(3)
+#define UB960_RR_RX_PORT_STS2_FREQ_STABLE	BIT(2)
+#define UB960_RR_RX_PORT_STS2_CABLE_FAULT	BIT(1)
+#define UB960_RR_RX_PORT_STS2_LINE_CNT_CHG	BIT(0)
+#define UB960_RR_RX_PORT_STS2_ERROR_MASK       \
+	UB960_RR_RX_PORT_STS2_BUFFER_ERROR
+
+#define UB960_RR_RX_FREQ_HIGH			0x4f
+#define UB960_RR_RX_FREQ_LOW			0x50
+#define UB960_RR_SENSOR_STS_0			0x51
+#define UB960_RR_SENSOR_STS_1			0x52
+#define UB960_RR_SENSOR_STS_2			0x53
+#define UB960_RR_SENSOR_STS_3			0x54
+#define UB960_RR_RX_PAR_ERR_HI			0x55
+#define UB960_RR_RX_PAR_ERR_LO			0x56
+#define UB960_RR_BIST_ERR_COUNT			0x57
+
+#define UB960_RR_BCC_CONFIG			0x58
+#define UB960_RR_BCC_CONFIG_I2C_PASS_THROUGH	BIT(6)
+#define UB960_RR_BCC_CONFIG_BC_FREQ_SEL_MASK	GENMASK(2, 0)
+
+#define UB960_RR_DATAPATH_CTL1			0x59
+#define UB960_RR_DATAPATH_CTL2			0x5a
+#define UB960_RR_SER_ID				0x5b
+#define UB960_RR_SER_ALIAS_ID			0x5c
+
+/* For these two register sets: n < UB960_MAX_PORT_ALIASES */
+#define UB960_RR_SLAVE_ID(n)			(0x5d + (n))
+#define UB960_RR_SLAVE_ALIAS(n)			(0x65 + (n))
+
+#define UB960_RR_PORT_CONFIG			0x6d
+#define UB960_RR_PORT_CONFIG_FPD3_MODE_MASK	GENMASK(1, 0)
+
+#define UB960_RR_BC_GPIO_CTL(n)			(0x6e + (n)) /* n < 2 */
+#define UB960_RR_RAW10_ID			0x70
+#define UB960_RR_RAW10_ID_VC_SHIFT		6
+#define UB960_RR_RAW10_ID_DT_SHIFT		0
+
+#define UB960_RR_RAW12_ID			0x71
+#define UB960_RR_CSI_VC_MAP			0x72
+#define UB960_RR_CSI_VC_MAP_SHIFT(x)		((x) * 2)
+
+#define UB960_RR_LINE_COUNT_HI			0x73
+#define UB960_RR_LINE_COUNT_LO			0x74
+#define UB960_RR_LINE_LEN_1			0x75
+#define UB960_RR_LINE_LEN_0			0x76
+#define UB960_RR_FREQ_DET_CTL			0x77
+#define UB960_RR_MAILBOX_1			0x78
+#define UB960_RR_MAILBOX_2			0x79
+
+#define UB960_RR_CSI_RX_STS			0x7a
+#define UB960_RR_CSI_RX_STS_LENGTH_ERR		BIT(3)
+#define UB960_RR_CSI_RX_STS_CKSUM_ERR		BIT(2)
+#define UB960_RR_CSI_RX_STS_ECC2_ERR		BIT(1)
+#define UB960_RR_CSI_RX_STS_ECC1_ERR		BIT(0)
+#define UB960_RR_CSI_RX_STS_ERROR_MASK                                    \
+	(UB960_RR_CSI_RX_STS_LENGTH_ERR | UB960_RR_CSI_RX_STS_CKSUM_ERR | \
+	 UB960_RR_CSI_RX_STS_ECC2_ERR | UB960_RR_CSI_RX_STS_ECC1_ERR)
+
+#define UB960_RR_CSI_ERR_COUNTER		0x7b
+#define UB960_RR_PORT_CONFIG2			0x7c
+#define UB960_RR_PORT_CONFIG2_RAW10_8BIT_CTL_MASK GENMASK(7, 6)
+#define UB960_RR_PORT_CONFIG2_RAW10_8BIT_CTL_SHIFT 6
+
+#define UB960_RR_PORT_CONFIG2_LV_POL_LOW	BIT(1)
+#define UB960_RR_PORT_CONFIG2_FV_POL_LOW	BIT(0)
+
+#define UB960_RR_PORT_PASS_CTL			0x7d
+#define UB960_RR_SEN_INT_RISE_CTL		0x7e
+#define UB960_RR_SEN_INT_FALL_CTL		0x7f
+
+#define UB960_SR_CSI_FRAME_COUNT_HI(n)		(0x90 + 8 * (n))
+#define UB960_SR_CSI_FRAME_COUNT_LO(n)		(0x91 + 8 * (n))
+#define UB960_SR_CSI_FRAME_ERR_COUNT_HI(n)	(0x92 + 8 * (n))
+#define UB960_SR_CSI_FRAME_ERR_COUNT_LO(n)	(0x93 + 8 * (n))
+#define UB960_SR_CSI_LINE_COUNT_HI(n)		(0x94 + 8 * (n))
+#define UB960_SR_CSI_LINE_COUNT_LO(n)		(0x95 + 8 * (n))
+#define UB960_SR_CSI_LINE_ERR_COUNT_HI(n)	(0x96 + 8 * (n))
+#define UB960_SR_CSI_LINE_ERR_COUNT_LO(n)	(0x97 + 8 * (n))
+
+#define UB960_XR_REFCLK_FREQ			0xa5	/* UB960 */
+
+#define UB960_RR_VC_ID_MAP(x)			(0xa0 + (x)) /* UB9702 */
+
+#define UB960_SR_IND_ACC_CTL			0xb0
+#define UB960_SR_IND_ACC_CTL_IA_AUTO_INC	BIT(1)
+
+#define UB960_SR_IND_ACC_ADDR			0xb1
+#define UB960_SR_IND_ACC_DATA			0xb2
+#define UB960_SR_BIST_CONTROL			0xb3
+#define UB960_SR_MODE_IDX_STS			0xb8
+#define UB960_SR_LINK_ERROR_COUNT		0xb9
+#define UB960_SR_FPD3_ENC_CTL			0xba
+#define UB960_SR_FV_MIN_TIME			0xbc
+#define UB960_SR_GPIO_PD_CTL			0xbe
+
+#define UB960_SR_FPD_RATE_CFG			0xc2	/* UB9702 */
+#define UB960_SR_CSI_PLL_DIV			0xc9	/* UB9702 */
+
+#define UB960_RR_PORT_DEBUG			0xd0
+#define UB960_RR_AEQ_CTL2			0xd2
+#define UB960_RR_AEQ_CTL2_SET_AEQ_FLOOR		BIT(2)
+
+#define UB960_RR_AEQ_STATUS			0xd3
+#define UB960_RR_AEQ_STATUS_STATUS_2		GENMASK(5, 3)
+#define UB960_RR_AEQ_STATUS_STATUS_1		GENMASK(2, 0)
+
+#define UB960_RR_AEQ_BYPASS			0xd4
+#define UB960_RR_AEQ_BYPASS_EQ_STAGE1_VALUE_SHIFT	5
+#define UB960_RR_AEQ_BYPASS_EQ_STAGE1_VALUE_MASK	GENMASK(7, 5)
+#define UB960_RR_AEQ_BYPASS_EQ_STAGE2_VALUE_SHIFT	1
+#define UB960_RR_AEQ_BYPASS_EQ_STAGE2_VALUE_MASK	GENMASK(3, 1)
+#define UB960_RR_AEQ_BYPASS_ENABLE			BIT(0)
+
+#define UB960_RR_AEQ_MIN_MAX			0xd5
+#define UB960_RR_AEQ_MIN_MAX_AEQ_MAX_SHIFT	4
+#define UB960_RR_AEQ_MIN_MAX_AEQ_FLOOR_SHIFT	0
+
+#define UB960_RR_SFILTER_STS_0			0xd6
+#define UB960_RR_SFILTER_STS_1			0xd7
+#define UB960_RR_PORT_ICR_HI			0xd8
+#define UB960_RR_PORT_ICR_LO			0xd9
+#define UB960_RR_PORT_ISR_HI			0xda
+#define UB960_RR_PORT_ISR_LO			0xdb
+#define UB960_RR_FC_GPIO_STS			0xdc
+#define UB960_RR_FC_GPIO_ICR			0xdd
+#define UB960_RR_SEN_INT_RISE_STS		0xde
+#define UB960_RR_SEN_INT_FALL_STS		0xdf
+
+#define UB960_RR_CHANNEL_MODE			0xe4	/* UB9702 */
+
+#define UB960_SR_FPD3_RX_ID(n)			(0xf0 + (n))
+#define UB960_SR_FPD3_RX_ID_LEN			6
+
+#define UB960_SR_I2C_RX_ID(n)			(0xf8 + (n)) /* < UB960_FPD_RX_NPORTS */
+
+/* Indirect register blocks */
+#define UB960_IND_TARGET_PAT_GEN		0x00
+#define UB960_IND_TARGET_RX_ANA(n)		(0x01 + (n))
+#define UB960_IND_TARGET_CSI_CSIPLL_REG_1	0x92	/* UB9702 */
+#define UB960_IND_TARGET_CSI_ANA		0x07
+
+/* UB960_IR_PGEN_*: Indirect Registers for Test Pattern Generator */
+
+#define UB960_IR_PGEN_CTL			0x01
+#define UB960_IR_PGEN_CTL_PGEN_ENABLE		BIT(0)
+
+#define UB960_IR_PGEN_CFG			0x02
+#define UB960_IR_PGEN_CSI_DI			0x03
+#define UB960_IR_PGEN_LINE_SIZE1		0x04
+#define UB960_IR_PGEN_LINE_SIZE0		0x05
+#define UB960_IR_PGEN_BAR_SIZE1			0x06
+#define UB960_IR_PGEN_BAR_SIZE0			0x07
+#define UB960_IR_PGEN_ACT_LPF1			0x08
+#define UB960_IR_PGEN_ACT_LPF0			0x09
+#define UB960_IR_PGEN_TOT_LPF1			0x0a
+#define UB960_IR_PGEN_TOT_LPF0			0x0b
+#define UB960_IR_PGEN_LINE_PD1			0x0c
+#define UB960_IR_PGEN_LINE_PD0			0x0d
+#define UB960_IR_PGEN_VBP			0x0e
+#define UB960_IR_PGEN_VFP			0x0f
+#define UB960_IR_PGEN_COLOR(n)			(0x10 + (n)) /* n < 15 */
+
+#define UB960_IR_RX_ANA_STROBE_SET_CLK		0x08
+#define UB960_IR_RX_ANA_STROBE_SET_CLK_NO_EXTRA_DELAY	BIT(3)
+#define UB960_IR_RX_ANA_STROBE_SET_CLK_DELAY_MASK	GENMASK(2, 0)
+
+#define UB960_IR_RX_ANA_STROBE_SET_DATA		0x09
+#define UB960_IR_RX_ANA_STROBE_SET_DATA_NO_EXTRA_DELAY	BIT(3)
+#define UB960_IR_RX_ANA_STROBE_SET_DATA_DELAY_MASK	GENMASK(2, 0)
+
+/* EQ related */
+
+#define UB960_MIN_AEQ_STROBE_POS -7
+#define UB960_MAX_AEQ_STROBE_POS  7
+
+#define UB960_MANUAL_STROBE_EXTRA_DELAY 6
+
+#define UB960_MIN_MANUAL_STROBE_POS -(7 + UB960_MANUAL_STROBE_EXTRA_DELAY)
+#define UB960_MAX_MANUAL_STROBE_POS  (7 + UB960_MANUAL_STROBE_EXTRA_DELAY)
+#define UB960_NUM_MANUAL_STROBE_POS  (UB960_MAX_MANUAL_STROBE_POS - UB960_MIN_MANUAL_STROBE_POS + 1)
+
+#define UB960_MIN_EQ_LEVEL  0
+#define UB960_MAX_EQ_LEVEL  14
+#define UB960_NUM_EQ_LEVELS (UB960_MAX_EQ_LEVEL - UB960_MIN_EQ_LEVEL + 1)
+
+struct ub960_hw_data {
+	const char *model;
+	u8 num_rxports;
+	u8 num_txports;
+	bool is_ub9702;
+	bool is_fpdlink4;
+};
+
+enum ub960_rxport_mode {
+	RXPORT_MODE_RAW10 = 0,
+	RXPORT_MODE_RAW12_HF = 1,
+	RXPORT_MODE_RAW12_LF = 2,
+	RXPORT_MODE_CSI2_SYNC = 3,
+	RXPORT_MODE_CSI2_ASYNC = 4,
+	RXPORT_MODE_LAST = RXPORT_MODE_CSI2_ASYNC,
+};
+
+enum ub960_rxport_cdr {
+	RXPORT_CDR_FPD3 = 0,
+	RXPORT_CDR_FPD4 = 1,
+	RXPORT_CDR_LAST = RXPORT_CDR_FPD4,
+};
+
+struct ub960_rxport {
+	struct ub960_data      *priv;
+	u8                      nport;	/* RX port number, and index in priv->rxport[] */
+
+	struct {
+		struct v4l2_subdev *sd;
+		u16 pad;
+		struct fwnode_handle *ep_fwnode;
+	} source;
+
+	/* Serializer */
+	struct {
+		struct fwnode_handle *fwnode;
+		struct i2c_client *client;
+		unsigned short alias; /* I2C alias (lower 7 bits) */
+		struct ds90ub9xx_platform_data pdata;
+	} ser;
+
+	enum ub960_rxport_mode  rx_mode;
+	enum ub960_rxport_cdr	cdr_mode;
+
+	u8			lv_fv_pol;	/* LV and FV polarities */
+
+	struct regulator	*vpoc;
+
+	/* EQ settings */
+	struct {
+		bool manual_eq;
+
+		s8 strobe_pos;
+
+		union {
+			struct {
+				u8 eq_level_min;
+				u8 eq_level_max;
+			} aeq;
+
+			struct {
+				u8 eq_level;
+			} manual;
+		};
+	} eq;
+};
+
+struct ub960_asd {
+	struct v4l2_async_subdev base;
+	struct ub960_rxport *rxport;
+};
+
+static inline struct ub960_asd *to_ub960_asd(struct v4l2_async_subdev *asd)
+{
+	return container_of(asd, struct ub960_asd, base);
+}
+
+struct ub960_txport {
+	struct ub960_data      *priv;
+	u8                      nport;	/* TX port number, and index in priv->txport[] */
+
+	u32 num_data_lanes;
+};
+
+struct atr_alias_table_entry {
+	u16 alias_id;	/* Alias ID from DT */
+
+	u8 nport;
+	u8 slave_id;	/* i2c client's local i2c address */
+	u8 port_reg_idx;
+
+	bool in_use;
+};
+
+struct ub960_data {
+	const struct ub960_hw_data	*hw_data;
+	struct i2c_client	*client; /* for shared local registers */
+	struct regmap		*regmap;
+
+	/* lock for register access */
+	struct mutex		reg_lock;
+
+	struct clk		*refclk;
+
+	struct regulator	*vddio;
+
+	struct gpio_desc	*pd_gpio;
+	struct delayed_work	poll_work;
+	struct ub960_rxport	*rxports[UB960_MAX_RX_NPORTS];
+	struct ub960_txport	*txports[UB960_MAX_TX_NPORTS];
+
+	struct v4l2_subdev	sd;
+	struct media_pad	pads[UB960_MAX_NPORTS];
+
+	struct v4l2_ctrl_handler   ctrl_handler;
+	struct v4l2_async_notifier notifier;
+
+	u32 tx_data_rate;		/* Nominal data rate (Gb/s) */
+	s64 tx_link_freq[1];
+
+	struct {
+		struct i2c_atr *atr;
+
+		/* Protects fields below in this struct */
+		struct mutex lock;
+		size_t num_aliases;
+		struct atr_alias_table_entry *aliases;
+	} atr;
+
+	struct {
+		u8 rxport;
+		u8 txport;
+		u8 indirect_target;
+	} reg_current;
+
+	bool streaming;
+
+	u8 stored_fwd_ctl;
+
+	u64 stream_enable_mask[UB960_MAX_NPORTS];
+
+	/* These are common to all ports */
+	struct {
+		bool manual;
+
+		s8 min;
+		s8 max;
+	} strobe;
+};
+
+static inline struct ub960_data *sd_to_ub960(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct ub960_data, sd);
+}
+
+static inline bool ub960_pad_is_sink(struct ub960_data *priv, u32 pad)
+{
+	return pad < priv->hw_data->num_rxports;
+}
+
+static inline bool ub960_pad_is_source(struct ub960_data *priv, u32 pad)
+{
+	return pad >= priv->hw_data->num_rxports;
+}
+
+static inline unsigned int ub960_pad_to_port(struct ub960_data *priv, u32 pad)
+{
+	if (ub960_pad_is_sink(priv, pad))
+		return pad;
+	else
+		return pad - priv->hw_data->num_rxports;
+}
+
+struct ub960_format_info {
+	u32 code;
+	u32 bpp;
+	u8 datatype;
+	bool meta;
+};
+
+static const struct ub960_format_info ub960_formats[] = {
+	{ .code = MEDIA_BUS_FMT_YUYV8_1X16, .bpp = 16, .datatype = MIPI_CSI2_DT_YUV422_8B, },
+	{ .code = MEDIA_BUS_FMT_UYVY8_1X16, .bpp = 16, .datatype = MIPI_CSI2_DT_YUV422_8B, },
+	{ .code = MEDIA_BUS_FMT_VYUY8_1X16, .bpp = 16, .datatype = MIPI_CSI2_DT_YUV422_8B, },
+	{ .code = MEDIA_BUS_FMT_YVYU8_1X16, .bpp = 16, .datatype = MIPI_CSI2_DT_YUV422_8B, },
+
+	{ .code = MEDIA_BUS_FMT_SBGGR12_1X12, .bpp = 12, .datatype = MIPI_CSI2_DT_RAW12, },
+	{ .code = MEDIA_BUS_FMT_SGBRG12_1X12, .bpp = 12, .datatype = MIPI_CSI2_DT_RAW12, },
+	{ .code = MEDIA_BUS_FMT_SGRBG12_1X12, .bpp = 12, .datatype = MIPI_CSI2_DT_RAW12, },
+	{ .code = MEDIA_BUS_FMT_SRGGB12_1X12, .bpp = 12, .datatype = MIPI_CSI2_DT_RAW12, },
+};
+
+static const struct ub960_format_info *ub960_find_format(u32 code)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(ub960_formats); i++) {
+		if (ub960_formats[i].code == code)
+			return &ub960_formats[i];
+	}
+
+	return NULL;
+}
+
+/* -----------------------------------------------------------------------------
+ * Basic device access
+ */
+
+static int ub960_read(struct ub960_data *priv, u8 reg, u8 *val)
+{
+	struct device *dev = &priv->client->dev;
+	unsigned int v;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = regmap_read(priv->regmap, reg, &v);
+	if (ret) {
+		dev_err(dev, "%s: cannot read register 0x%02x (%d)!\n",
+			__func__, reg, ret);
+		goto out_unlock;
+	}
+
+	*val = v;
+
+out_unlock:
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_write(struct ub960_data *priv, u8 reg, u8 val)
+{
+	struct device *dev = &priv->client->dev;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = regmap_write(priv->regmap, reg, val);
+	if (ret)
+		dev_err(dev, "%s: cannot write register 0x%02x (%d)!\n",
+			__func__, reg, ret);
+
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_update_bits(struct ub960_data *priv, u8 reg, u8 mask, u8 val)
+{
+	struct device *dev = &priv->client->dev;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = regmap_update_bits(priv->regmap, reg, mask, val);
+	if (ret)
+		dev_err(dev, "%s: cannot update register 0x%02x (%d)!\n",
+			__func__, reg, ret);
+
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_read16(struct ub960_data *priv, u8 reg, u16 *val)
+{
+	struct device *dev = &priv->client->dev;
+	__be16 __v;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = regmap_bulk_read(priv->regmap, reg, &__v, 2);
+	if (ret) {
+		dev_err(dev, "%s: cannot read register 0x%02x (%d)!\n",
+			__func__, reg, ret);
+		goto out_unlock;
+	}
+
+	*val = be16_to_cpu(__v);
+
+out_unlock:
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_rxport_select(struct ub960_data *priv, u8 nport)
+{
+	struct device *dev = &priv->client->dev;
+	int ret;
+
+	lockdep_assert_held(&priv->reg_lock);
+
+	if (priv->reg_current.rxport == nport)
+		return 0;
+
+	ret = regmap_write(priv->regmap, UB960_SR_FPD3_PORT_SEL,
+			   (nport << 4) | BIT(nport));
+	if (ret) {
+		dev_err(dev, "%s: cannot select rxport %d (%d)!\n", __func__,
+			nport, ret);
+		return ret;
+	}
+
+	priv->reg_current.rxport = nport;
+
+	return 0;
+}
+
+static int ub960_rxport_read(struct ub960_data *priv, u8 nport, u8 reg, u8 *val)
+{
+	struct device *dev = &priv->client->dev;
+	unsigned int v;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = ub960_rxport_select(priv, nport);
+	if (ret)
+		goto out_unlock;
+
+	ret = regmap_read(priv->regmap, reg, &v);
+	if (ret) {
+		dev_err(dev, "%s: cannot read register 0x%02x (%d)!\n",
+			__func__, reg, ret);
+		goto out_unlock;
+	}
+
+	*val = v;
+
+out_unlock:
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_rxport_write(struct ub960_data *priv, u8 nport, u8 reg, u8 val)
+{
+	struct device *dev = &priv->client->dev;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = ub960_rxport_select(priv, nport);
+	if (ret)
+		goto out_unlock;
+
+	ret = regmap_write(priv->regmap, reg, val);
+	if (ret)
+		dev_err(dev, "%s: cannot write register 0x%02x (%d)!\n",
+			__func__, reg, ret);
+
+out_unlock:
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_rxport_update_bits(struct ub960_data *priv, u8 nport, u8 reg,
+				    u8 mask, u8 val)
+{
+	struct device *dev = &priv->client->dev;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = ub960_rxport_select(priv, nport);
+	if (ret)
+		goto out_unlock;
+
+	ret = regmap_update_bits(priv->regmap, reg, mask, val);
+	if (ret)
+		dev_err(dev, "%s: cannot update register 0x%02x (%d)!\n",
+			__func__, reg, ret);
+
+out_unlock:
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_rxport_read16(struct ub960_data *priv, u8 nport, u8 reg,
+			       u16 *val)
+{
+	struct device *dev = &priv->client->dev;
+	__be16 __v;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = ub960_rxport_select(priv, nport);
+	if (ret)
+		goto out_unlock;
+
+	ret = regmap_bulk_read(priv->regmap, reg, &__v, 2);
+	if (ret) {
+		dev_err(dev, "%s: cannot read register 0x%02x (%d)!\n",
+			__func__, reg, ret);
+		goto out_unlock;
+	}
+
+	*val = be16_to_cpu(__v);
+
+out_unlock:
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_txport_select(struct ub960_data *priv, u8 nport)
+{
+	struct device *dev = &priv->client->dev;
+	int ret;
+
+	lockdep_assert_held(&priv->reg_lock);
+
+	if (priv->reg_current.txport == nport)
+		return 0;
+
+	ret = regmap_write(priv->regmap, UB960_SR_CSI_PORT_SEL,
+			   (nport << 4) | BIT(nport));
+	if (ret) {
+		dev_err(dev, "%s: cannot select tx port %d (%d)!\n", __func__,
+			nport, ret);
+		return ret;
+	}
+
+	priv->reg_current.txport = nport;
+
+	return 0;
+}
+
+static int ub960_txport_read(struct ub960_data *priv, u8 nport, u8 reg, u8 *val)
+{
+	struct device *dev = &priv->client->dev;
+	unsigned int v;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = ub960_txport_select(priv, nport);
+	if (ret)
+		goto out_unlock;
+
+	ret = regmap_read(priv->regmap, reg, &v);
+	if (ret) {
+		dev_err(dev, "%s: cannot read register 0x%02x (%d)!\n",
+			__func__, reg, ret);
+		goto out_unlock;
+	}
+
+	*val = v;
+
+out_unlock:
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_txport_write(struct ub960_data *priv, u8 nport, u8 reg, u8 val)
+{
+	struct device *dev = &priv->client->dev;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = ub960_txport_select(priv, nport);
+	if (ret)
+		goto out_unlock;
+
+	ret = regmap_write(priv->regmap, reg, val);
+	if (ret)
+		dev_err(dev, "%s: cannot write register 0x%02x (%d)!\n",
+			__func__, reg, ret);
+
+out_unlock:
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_txport_update_bits(struct ub960_data *priv, u8 nport, u8 reg,
+				    u8 mask, u8 val)
+{
+	struct device *dev = &priv->client->dev;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = ub960_txport_select(priv, nport);
+	if (ret)
+		goto out_unlock;
+
+	ret = regmap_update_bits(priv->regmap, reg, mask, val);
+	if (ret)
+		dev_err(dev, "%s: cannot update register 0x%02x (%d)!\n",
+			__func__, reg, ret);
+
+out_unlock:
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_select_ind_reg_block(struct ub960_data *priv, u8 block)
+{
+	struct device *dev = &priv->client->dev;
+	int ret;
+
+	lockdep_assert_held(&priv->reg_lock);
+
+	if (priv->reg_current.indirect_target == block)
+		return 0;
+
+	ret = regmap_write(priv->regmap, UB960_SR_IND_ACC_CTL, block << 2);
+	if (ret) {
+		dev_err(dev, "%s: cannot select indirect target %u (%d)!\n",
+			__func__, block, ret);
+		return ret;
+	}
+
+	priv->reg_current.indirect_target = block;
+
+	return 0;
+}
+
+static int ub960_read_ind(struct ub960_data *priv, u8 block, u8 reg, u8 *val)
+{
+	struct device *dev = &priv->client->dev;
+	unsigned int v;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = ub960_select_ind_reg_block(priv, block);
+	if (ret)
+		goto out_unlock;
+
+	ret = regmap_write(priv->regmap, UB960_SR_IND_ACC_ADDR, reg);
+	if (ret) {
+		dev_err(dev,
+			"Write to IND_ACC_ADDR failed when reading %u:%x02x: %d\n",
+			block, reg, ret);
+		goto out_unlock;
+	}
+
+	ret = regmap_read(priv->regmap, UB960_SR_IND_ACC_DATA, &v);
+	if (ret) {
+		dev_err(dev,
+			"Write to IND_ACC_DATA failed when reading %u:%x02x: %d\n",
+			block, reg, ret);
+		goto out_unlock;
+	}
+
+	*val = v;
+
+out_unlock:
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_write_ind(struct ub960_data *priv, u8 block, u8 reg, u8 val)
+{
+	struct device *dev = &priv->client->dev;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = ub960_select_ind_reg_block(priv, block);
+	if (ret)
+		goto out_unlock;
+
+	ret = regmap_write(priv->regmap, UB960_SR_IND_ACC_ADDR, reg);
+	if (ret) {
+		dev_err(dev,
+			"Write to IND_ACC_ADDR failed when writing %u:%x02x: %d\n",
+			block, reg, ret);
+		goto out_unlock;
+	}
+
+	ret = regmap_write(priv->regmap, UB960_SR_IND_ACC_DATA, val);
+	if (ret) {
+		dev_err(dev,
+			"Write to IND_ACC_DATA failed when writing %u:%x02x: %d\n",
+			block, reg, ret);
+		goto out_unlock;
+	}
+
+out_unlock:
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+static int ub960_ind_update_bits(struct ub960_data *priv, u8 block, u8 reg,
+				 u8 mask, u8 val)
+{
+	struct device *dev = &priv->client->dev;
+	int ret;
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = ub960_select_ind_reg_block(priv, block);
+	if (ret)
+		goto out_unlock;
+
+	ret = regmap_write(priv->regmap, UB960_SR_IND_ACC_ADDR, reg);
+	if (ret) {
+		dev_err(dev,
+			"Write to IND_ACC_ADDR failed when updating %u:%x02x: %d\n",
+			block, reg, ret);
+		goto out_unlock;
+	}
+
+	ret = regmap_update_bits(priv->regmap, UB960_SR_IND_ACC_DATA, mask,
+				 val);
+	if (ret) {
+		dev_err(dev,
+			"Write to IND_ACC_DATA failed when updating %u:%x02x: %d\n",
+			block, reg, ret);
+		goto out_unlock;
+	}
+
+out_unlock:
+	mutex_unlock(&priv->reg_lock);
+
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * I2C-ATR (address translator)
+ */
+
+static int ub960_atr_attach_client(struct i2c_atr *atr, u32 chan_id,
+				   const struct i2c_client *client,
+				   u16 *alias_id)
+{
+	struct ub960_data *priv = i2c_atr_get_driver_data(atr);
+	struct ub960_rxport *rxport = priv->rxports[chan_id];
+	struct device *dev = &priv->client->dev;
+	struct atr_alias_table_entry *entry = NULL;
+	unsigned int reg_idx;
+	unsigned int pool_idx;
+	u16 alias;
+	int ret = 0;
+	u8 port_reg_idx_mask = 0;
+
+	mutex_lock(&priv->atr.lock);
+
+	/*
+	 * Go through the alias table and:
+	 *	1. Look for an unreserved entry
+	 *	2. Construct a bitmask of port's used alias entries
+	 */
+
+	for (pool_idx = 0; pool_idx < priv->atr.num_aliases; pool_idx++) {
+		struct atr_alias_table_entry *e;
+
+		e = &priv->atr.aliases[pool_idx];
+
+		if (!entry && !e->in_use)
+			entry = e;
+
+		if (e->in_use && e->nport == rxport->nport)
+			port_reg_idx_mask |= BIT(e->port_reg_idx);
+	}
+
+	if (!entry) {
+		dev_err(dev, "rx%u: alias pool exhausted\n", rxport->nport);
+		ret = -EADDRNOTAVAIL;
+		goto out_unlock;
+	}
+
+	if (port_reg_idx_mask == GENMASK(UB960_MAX_PORT_ALIASES - 1, 0)) {
+		dev_err(dev, "rx%u: all aliases in use\n", rxport->nport);
+		ret = -EADDRNOTAVAIL;
+		goto out_unlock;
+	}
+
+	alias = entry->alias_id;
+
+	reg_idx = ffz(port_reg_idx_mask);
+
+	entry->in_use = true;
+	entry->nport = rxport->nport;
+	entry->slave_id = client->addr;
+	entry->port_reg_idx = reg_idx;
+
+	/* Map alias to slave */
+
+	ub960_rxport_write(priv, chan_id, UB960_RR_SLAVE_ID(reg_idx),
+			   client->addr << 1);
+	ub960_rxport_write(priv, chan_id, UB960_RR_SLAVE_ALIAS(reg_idx),
+			   alias << 1);
+
+	*alias_id = alias; /* tell the atr which alias we chose */
+
+out_unlock:
+	mutex_unlock(&priv->atr.lock);
+	return ret;
+}
+
+static void ub960_atr_detach_client(struct i2c_atr *atr, u32 chan_id,
+				    const struct i2c_client *client)
+{
+	struct ub960_data *priv = i2c_atr_get_driver_data(atr);
+	struct ub960_rxport *rxport = priv->rxports[chan_id];
+	struct device *dev = &priv->client->dev;
+	struct atr_alias_table_entry *entry;
+	unsigned int reg_idx;
+	unsigned int pool_idx;
+
+	mutex_lock(&priv->atr.lock);
+
+	/* Find alias mapped to this client */
+
+	for (pool_idx = 0; pool_idx < priv->atr.num_aliases; pool_idx++) {
+		entry = &priv->atr.aliases[pool_idx];
+
+		if (entry->in_use && entry->nport == rxport->nport &&
+		    entry->slave_id == client->addr)
+			break;
+	}
+
+	if (pool_idx == priv->atr.num_aliases) {
+		dev_err(dev, "rx%u: client 0x%02x is not mapped!\n",
+			rxport->nport, client->addr);
+		goto out_unlock;
+	}
+
+	reg_idx = entry->port_reg_idx;
+
+	/* Unmap */
+
+	ub960_rxport_write(priv, chan_id, UB960_RR_SLAVE_ALIAS(reg_idx), 0);
+
+	entry->in_use = false;
+
+out_unlock:
+	mutex_unlock(&priv->atr.lock);
+}
+
+static const struct i2c_atr_ops ub960_atr_ops = {
+	.attach_client = ub960_atr_attach_client,
+	.detach_client = ub960_atr_detach_client,
+};
+
+static int ub960_init_atr(struct ub960_data *priv)
+{
+	struct device *dev = &priv->client->dev;
+	struct i2c_adapter *parent_adap = priv->client->adapter;
+
+	priv->atr.atr = i2c_atr_new(parent_adap, dev, &ub960_atr_ops,
+				    priv->hw_data->num_rxports);
+	if (IS_ERR(priv->atr.atr))
+		return PTR_ERR(priv->atr.atr);
+
+	i2c_atr_set_driver_data(priv->atr.atr, priv);
+
+	return 0;
+}
+
+static void ub960_uninit_atr(struct ub960_data *priv)
+{
+	i2c_atr_delete(priv->atr.atr);
+	priv->atr.atr = NULL;
+}
+
+/* -----------------------------------------------------------------------------
+ * TX ports
+ */
+
+static int ub960_parse_dt_txport(struct ub960_data *priv,
+				 struct fwnode_handle *ep_fwnode,
+				 u8 nport)
+{
+	struct device *dev = &priv->client->dev;
+	struct v4l2_fwnode_endpoint vep = {};
+	struct ub960_txport *txport;
+	int ret;
+
+	txport = kzalloc(sizeof(*txport), GFP_KERNEL);
+	if (!txport)
+		return -ENOMEM;
+
+	txport->priv = priv;
+	txport->nport = nport;
+
+	vep.bus_type = V4L2_MBUS_CSI2_DPHY;
+	ret = v4l2_fwnode_endpoint_alloc_parse(ep_fwnode, &vep);
+	if (ret) {
+		dev_err(dev, "tx%u: failed to parse endpoint data\n", nport);
+		goto err_free_txport;
+	}
+
+	txport->num_data_lanes = vep.bus.mipi_csi2.num_data_lanes;
+
+	if (vep.nr_of_link_frequencies != 1) {
+		ret = -EINVAL;
+		goto err_free_vep;
+	}
+
+	priv->tx_link_freq[0] = vep.link_frequencies[0];
+	priv->tx_data_rate = priv->tx_link_freq[0] * 2;
+
+	if (priv->tx_data_rate != MHZ(1600) &&
+	    priv->tx_data_rate != MHZ(1200) &&
+	    priv->tx_data_rate != MHZ(800) &&
+	    priv->tx_data_rate != MHZ(400)) {
+		dev_err(dev, "tx%u: invalid 'link-frequencies' value\n", nport);
+		ret = -EINVAL;
+		goto err_free_vep;
+	}
+
+	v4l2_fwnode_endpoint_free(&vep);
+
+	priv->txports[nport] = txport;
+
+	return 0;
+
+err_free_vep:
+	v4l2_fwnode_endpoint_free(&vep);
+err_free_txport:
+	kfree(txport);
+
+	return ret;
+}
+
+static void ub960_csi_handle_events(struct ub960_data *priv, u8 nport)
+{
+	struct device *dev = &priv->client->dev;
+	u8 csi_tx_isr;
+	int ret;
+
+	ret = ub960_txport_read(priv, nport, UB960_TR_CSI_TX_ISR, &csi_tx_isr);
+	if (ret)
+		return;
+
+	if (csi_tx_isr & UB960_TR_CSI_TX_ISR_IS_CSI_SYNC_ERROR)
+		dev_warn(dev, "TX%u: CSI_SYNC_ERROR\n", nport);
+
+	if (csi_tx_isr & UB960_TR_CSI_TX_ISR_IS_CSI_PASS_ERROR)
+		dev_warn(dev, "TX%u: CSI_PASS_ERROR\n", nport);
+}
+
+/* -----------------------------------------------------------------------------
+ * RX ports
+ */
+
+static int ub960_rxport_enable_vpocs(struct ub960_data *priv)
+{
+	unsigned int nport;
+	int ret;
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+
+		if (!rxport || !rxport->vpoc)
+			continue;
+
+		ret = regulator_enable(rxport->vpoc);
+		if (ret)
+			goto err_disable_vpocs;
+	}
+
+	return 0;
+
+err_disable_vpocs:
+	while (nport--) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+
+		if (!rxport || !rxport->vpoc)
+			continue;
+
+		regulator_disable(rxport->vpoc);
+	}
+
+	return ret;
+}
+
+static void ub960_rxport_disable_vpocs(struct ub960_data *priv)
+{
+	unsigned int nport;
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+
+		if (!rxport || !rxport->vpoc)
+			continue;
+
+		regulator_disable(rxport->vpoc);
+	}
+}
+
+static void ub960_rxport_clear_errors(struct ub960_data *priv,
+				      unsigned int nport)
+{
+	u8 v;
+
+	ub960_rxport_read(priv, nport, UB960_RR_RX_PORT_STS1, &v);
+	ub960_rxport_read(priv, nport, UB960_RR_RX_PORT_STS2, &v);
+	ub960_rxport_read(priv, nport, UB960_RR_CSI_RX_STS, &v);
+	ub960_rxport_read(priv, nport, UB960_RR_BCC_STATUS, &v);
+
+	ub960_rxport_read(priv, nport, UB960_RR_RX_PAR_ERR_HI, &v);
+	ub960_rxport_read(priv, nport, UB960_RR_RX_PAR_ERR_LO, &v);
+
+	ub960_rxport_read(priv, nport, UB960_RR_CSI_ERR_COUNTER, &v);
+}
+
+static void ub960_clear_rx_errors(struct ub960_data *priv)
+{
+	unsigned int nport;
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++)
+		ub960_rxport_clear_errors(priv, nport);
+}
+
+static int ub960_rxport_get_strobe_pos(struct ub960_data *priv,
+				       unsigned int nport, s8 *strobe_pos)
+{
+	u8 v;
+	u8 clk_delay, data_delay;
+	int ret;
+
+	ub960_read_ind(priv, UB960_IND_TARGET_RX_ANA(nport),
+		       UB960_IR_RX_ANA_STROBE_SET_CLK, &v);
+
+	clk_delay = (v & UB960_IR_RX_ANA_STROBE_SET_CLK_NO_EXTRA_DELAY) ?
+			    0 : UB960_MANUAL_STROBE_EXTRA_DELAY;
+
+	ub960_read_ind(priv, UB960_IND_TARGET_RX_ANA(nport),
+		       UB960_IR_RX_ANA_STROBE_SET_DATA, &v);
+
+	data_delay = (v & UB960_IR_RX_ANA_STROBE_SET_DATA_NO_EXTRA_DELAY) ?
+			     0 : UB960_MANUAL_STROBE_EXTRA_DELAY;
+
+	ret = ub960_rxport_read(priv, nport, UB960_RR_SFILTER_STS_0, &v);
+	if (ret)
+		return ret;
+
+	clk_delay += v & UB960_IR_RX_ANA_STROBE_SET_CLK_DELAY_MASK;
+
+	ub960_rxport_read(priv, nport, UB960_RR_SFILTER_STS_1, &v);
+	if (ret)
+		return ret;
+
+	data_delay += v & UB960_IR_RX_ANA_STROBE_SET_DATA_DELAY_MASK;
+
+	*strobe_pos = data_delay - clk_delay;
+
+	return 0;
+}
+
+static void ub960_rxport_set_strobe_pos(struct ub960_data *priv,
+					unsigned int nport, s8 strobe_pos)
+{
+	u8 clk_delay, data_delay;
+
+	clk_delay = UB960_IR_RX_ANA_STROBE_SET_CLK_NO_EXTRA_DELAY;
+	data_delay = UB960_IR_RX_ANA_STROBE_SET_DATA_NO_EXTRA_DELAY;
+
+	if (strobe_pos < UB960_MIN_AEQ_STROBE_POS)
+		clk_delay = abs(strobe_pos) - UB960_MANUAL_STROBE_EXTRA_DELAY;
+	else if (strobe_pos > UB960_MAX_AEQ_STROBE_POS)
+		data_delay = strobe_pos - UB960_MANUAL_STROBE_EXTRA_DELAY;
+	else if (strobe_pos < 0)
+		clk_delay = abs(strobe_pos) | UB960_IR_RX_ANA_STROBE_SET_CLK_NO_EXTRA_DELAY;
+	else if (strobe_pos > 0)
+		data_delay = strobe_pos | UB960_IR_RX_ANA_STROBE_SET_DATA_NO_EXTRA_DELAY;
+
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport),
+			UB960_IR_RX_ANA_STROBE_SET_CLK, clk_delay);
+
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport),
+			UB960_IR_RX_ANA_STROBE_SET_DATA, data_delay);
+}
+
+static void ub960_rxport_set_strobe_range(struct ub960_data *priv,
+					  s8 strobe_min, s8 strobe_max)
+{
+	/* Convert the signed strobe pos to positive zero based value */
+	strobe_min -= UB960_MIN_AEQ_STROBE_POS;
+	strobe_max -= UB960_MIN_AEQ_STROBE_POS;
+
+	ub960_write(priv, UB960_XR_SFILTER_CFG,
+		    ((u8)strobe_min << UB960_XR_SFILTER_CFG_SFILTER_MIN_SHIFT) |
+		    ((u8)strobe_max << UB960_XR_SFILTER_CFG_SFILTER_MAX_SHIFT));
+}
+
+static int ub960_rxport_get_eq_level(struct ub960_data *priv,
+				     unsigned int nport, u8 *eq_level)
+{
+	int ret;
+	u8 v;
+
+	ret = ub960_rxport_read(priv, nport, UB960_RR_AEQ_STATUS, &v);
+	if (ret)
+		return ret;
+
+	*eq_level = (v & UB960_RR_AEQ_STATUS_STATUS_1) +
+		    (v & UB960_RR_AEQ_STATUS_STATUS_2);
+
+	return 0;
+}
+
+static void ub960_rxport_set_eq_level(struct ub960_data *priv,
+				      unsigned int nport, u8 eq_level)
+{
+	u8 eq_stage_1_select_value, eq_stage_2_select_value;
+	const unsigned int eq_stage_max = 7;
+	u8 v;
+
+	if (eq_level <= eq_stage_max) {
+		eq_stage_1_select_value = eq_level;
+		eq_stage_2_select_value = 0;
+	} else {
+		eq_stage_1_select_value = eq_stage_max;
+		eq_stage_2_select_value = eq_level - eq_stage_max;
+	}
+
+	ub960_rxport_read(priv, nport, UB960_RR_AEQ_BYPASS, &v);
+
+	v &= ~(UB960_RR_AEQ_BYPASS_EQ_STAGE1_VALUE_MASK |
+	       UB960_RR_AEQ_BYPASS_EQ_STAGE2_VALUE_MASK);
+	v |= eq_stage_1_select_value << UB960_RR_AEQ_BYPASS_EQ_STAGE1_VALUE_SHIFT;
+	v |= eq_stage_2_select_value << UB960_RR_AEQ_BYPASS_EQ_STAGE2_VALUE_SHIFT;
+	v |= UB960_RR_AEQ_BYPASS_ENABLE;
+
+	ub960_rxport_write(priv, nport, UB960_RR_AEQ_BYPASS, v);
+}
+
+static void ub960_rxport_set_eq_range(struct ub960_data *priv,
+				      unsigned int nport, u8 eq_min, u8 eq_max)
+{
+	ub960_rxport_write(priv, nport, UB960_RR_AEQ_MIN_MAX,
+			   (eq_min << UB960_RR_AEQ_MIN_MAX_AEQ_FLOOR_SHIFT) |
+			   (eq_max << UB960_RR_AEQ_MIN_MAX_AEQ_MAX_SHIFT));
+
+	/* Enable AEQ min setting */
+	ub960_rxport_update_bits(priv, nport, UB960_RR_AEQ_CTL2,
+				 UB960_RR_AEQ_CTL2_SET_AEQ_FLOOR,
+				 UB960_RR_AEQ_CTL2_SET_AEQ_FLOOR);
+}
+
+static void ub960_rxport_config_eq(struct ub960_data *priv, unsigned int nport)
+{
+	struct ub960_rxport *rxport = priv->rxports[nport];
+
+	/* We also set common settings here. Should be moved elsewhere. */
+
+	if (priv->strobe.manual) {
+		/* Disable AEQ_SFILTER_EN */
+		ub960_update_bits(priv, UB960_XR_AEQ_CTL1,
+				  UB960_XR_AEQ_CTL1_AEQ_SFILTER_EN, 0);
+	} else {
+		/* Enable SFILTER and error control */
+		ub960_write(priv, UB960_XR_AEQ_CTL1,
+			    UB960_XR_AEQ_CTL1_AEQ_ERR_CTL_MASK |
+				    UB960_XR_AEQ_CTL1_AEQ_SFILTER_EN);
+
+		/* Set AEQ strobe range */
+		ub960_rxport_set_strobe_range(priv, priv->strobe.min,
+					      priv->strobe.max);
+	}
+
+	/* The rest are port specific */
+
+	if (priv->strobe.manual)
+		ub960_rxport_set_strobe_pos(priv, nport, rxport->eq.strobe_pos);
+	else
+		ub960_rxport_set_strobe_pos(priv, nport, 0);
+
+	if (rxport->eq.manual_eq) {
+		ub960_rxport_set_eq_level(priv, nport,
+					  rxport->eq.manual.eq_level);
+
+		/* Enable AEQ Bypass */
+		ub960_rxport_update_bits(priv, nport, UB960_RR_AEQ_BYPASS,
+					 UB960_RR_AEQ_BYPASS_ENABLE,
+					 UB960_RR_AEQ_BYPASS_ENABLE);
+	} else {
+		ub960_rxport_set_eq_range(priv, nport,
+					  rxport->eq.aeq.eq_level_min,
+					  rxport->eq.aeq.eq_level_max);
+
+		/* Disable AEQ Bypass */
+		ub960_rxport_update_bits(priv, nport, UB960_RR_AEQ_BYPASS,
+					 UB960_RR_AEQ_BYPASS_ENABLE, 0);
+	}
+}
+
+static int ub960_rxport_link_ok(struct ub960_data *priv, unsigned int nport,
+				bool *ok)
+{
+	u8 rx_port_sts1, rx_port_sts2;
+	u16 parity_errors;
+	u8 csi_rx_sts;
+	u8 csi_err_cnt;
+	u8 bcc_sts;
+	int ret;
+	bool errors;
+
+	ret = ub960_rxport_read(priv, nport, UB960_RR_RX_PORT_STS1,
+				&rx_port_sts1);
+	if (ret)
+		return ret;
+
+	if (!(rx_port_sts1 & UB960_RR_RX_PORT_STS1_LOCK_STS)) {
+		*ok = false;
+		return 0;
+	}
+
+	ret = ub960_rxport_read(priv, nport, UB960_RR_RX_PORT_STS2,
+				&rx_port_sts2);
+	if (ret)
+		return ret;
+
+	ret = ub960_rxport_read(priv, nport, UB960_RR_CSI_RX_STS, &csi_rx_sts);
+	if (ret)
+		return ret;
+
+	ret = ub960_rxport_read(priv, nport, UB960_RR_CSI_ERR_COUNTER,
+				&csi_err_cnt);
+	if (ret)
+		return ret;
+
+	ret = ub960_rxport_read(priv, nport, UB960_RR_BCC_STATUS, &bcc_sts);
+	if (ret)
+		return ret;
+
+	ret = ub960_rxport_read16(priv, nport, UB960_RR_RX_PAR_ERR_HI,
+				  &parity_errors);
+	if (ret)
+		return ret;
+
+	errors = (rx_port_sts1 & UB960_RR_RX_PORT_STS1_ERROR_MASK) ||
+		 (rx_port_sts2 & UB960_RR_RX_PORT_STS2_ERROR_MASK) ||
+		 (bcc_sts & UB960_RR_BCC_STATUS_ERROR_MASK) ||
+		 (csi_rx_sts & UB960_RR_CSI_RX_STS_ERROR_MASK) || csi_err_cnt ||
+		 parity_errors;
+
+	*ok = !errors;
+
+	return 0;
+}
+
+/*
+ * Wait for the RX ports to lock, have no errors and have stable strobe position
+ * and EQ level.
+ */
+static int ub960_rxport_wait_locks(struct ub960_data *priv,
+				   unsigned long port_mask,
+				   unsigned int *lock_mask)
+{
+	struct device *dev = &priv->client->dev;
+	unsigned long timeout;
+	unsigned int link_ok_mask;
+	unsigned int missing;
+	unsigned int loops;
+	u8 nport;
+	int ret;
+
+	if (port_mask == 0) {
+		if (lock_mask)
+			*lock_mask = 0;
+		return 0;
+	}
+
+	if (port_mask >= BIT(priv->hw_data->num_rxports))
+		return -EINVAL;
+
+	timeout = jiffies + msecs_to_jiffies(1000);
+	loops = 0;
+	link_ok_mask = 0;
+
+	while (time_before(jiffies, timeout)) {
+		missing = 0;
+
+		for_each_set_bit(nport, &port_mask,
+				 priv->hw_data->num_rxports) {
+			struct ub960_rxport *rxport = priv->rxports[nport];
+			bool ok;
+
+			if (!rxport)
+				continue;
+
+			ret = ub960_rxport_link_ok(priv, nport, &ok);
+			if (ret)
+				return ret;
+
+			/*
+			 * We want the link to be ok for two consecutive loops,
+			 * as a link could get established just before our test
+			 * and drop soon after.
+			 */
+			if (!ok || !(link_ok_mask & BIT(nport)))
+				missing++;
+
+			if (ok)
+				link_ok_mask |= BIT(nport);
+			else
+				link_ok_mask &= ~BIT(nport);
+		}
+
+		loops++;
+
+		if (missing == 0)
+			break;
+
+		msleep(50);
+	}
+
+	if (lock_mask)
+		*lock_mask = link_ok_mask;
+
+	dev_dbg(dev, "Wait locks done in %u loops\n", loops);
+	for_each_set_bit(nport, &port_mask, priv->hw_data->num_rxports) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+		s8 strobe_pos, eq_level;
+		u16 v;
+
+		if (!rxport)
+			continue;
+
+		if (!(link_ok_mask & BIT(nport))) {
+			dev_dbg(dev, "\trx%u: not locked\n", nport);
+			continue;
+		}
+
+		ub960_rxport_read16(priv, nport, UB960_RR_RX_FREQ_HIGH, &v);
+
+		ret = ub960_rxport_get_strobe_pos(priv, nport, &strobe_pos);
+		if (ret)
+			return ret;
+
+		ret = ub960_rxport_get_eq_level(priv, nport, &eq_level);
+		if (ret)
+			return ret;
+
+		dev_dbg(dev, "\trx%u: locked, SP: %d, EQ: %u, freq %llu Hz\n",
+			nport, strobe_pos, eq_level, (v * 1000000ULL) >> 8);
+	}
+
+	return 0;
+}
+
+static unsigned long ub960_calc_bc_clk_rate_ub960(struct ub960_data *priv,
+						  struct ub960_rxport *rxport)
+{
+	unsigned int mult;
+	unsigned int div;
+
+	switch (rxport->rx_mode) {
+	case RXPORT_MODE_RAW10:
+	case RXPORT_MODE_RAW12_HF:
+	case RXPORT_MODE_RAW12_LF:
+		mult = 1;
+		div = 10;
+		break;
+
+	case RXPORT_MODE_CSI2_SYNC:
+		mult = 2;
+		div = 1;
+		break;
+
+	case RXPORT_MODE_CSI2_ASYNC:
+		mult = 2;
+		div = 5;
+		break;
+
+	default:
+		return 0;
+	}
+
+	return clk_get_rate(priv->refclk) * mult / div;
+}
+
+static unsigned long ub960_calc_bc_clk_rate_ub9702(struct ub960_data *priv,
+						   struct ub960_rxport *rxport)
+{
+	switch (rxport->rx_mode) {
+	case RXPORT_MODE_RAW10:
+	case RXPORT_MODE_RAW12_HF:
+	case RXPORT_MODE_RAW12_LF:
+		return 2359400;
+
+	case RXPORT_MODE_CSI2_SYNC:
+		return 47187500;
+
+	case RXPORT_MODE_CSI2_ASYNC:
+		return 9437500;
+
+	default:
+		return 0;
+	}
+}
+
+static int ub960_rxport_add_serializer(struct ub960_data *priv, u8 nport)
+{
+	struct ub960_rxport *rxport = priv->rxports[nport];
+	struct device *dev = &priv->client->dev;
+	struct ds90ub9xx_platform_data *ser_pdata = &rxport->ser.pdata;
+	struct i2c_board_info ser_info = {
+		.of_node = to_of_node(rxport->ser.fwnode),
+		.fwnode = rxport->ser.fwnode,
+		.platform_data = ser_pdata,
+	};
+
+	ser_pdata->port = nport;
+	ser_pdata->atr = priv->atr.atr;
+	if (priv->hw_data->is_ub9702)
+		ser_pdata->bc_rate = ub960_calc_bc_clk_rate_ub9702(priv, rxport);
+	else
+		ser_pdata->bc_rate = ub960_calc_bc_clk_rate_ub960(priv, rxport);
+
+	/*
+	 * The serializer is added under the same i2c adapter as the
+	 * deserializer. This is not quite right, as the serializer is behind
+	 * the FPD-Link.
+	 */
+	ser_info.addr = rxport->ser.alias;
+	rxport->ser.client =
+		i2c_new_client_device(priv->client->adapter, &ser_info);
+	if (!rxport->ser.client) {
+		dev_err(dev, "rx%u: cannot add %s i2c device", nport,
+			ser_info.type);
+		return -EIO;
+	}
+
+	dev_dbg(dev, "rx%u: remote serializer at alias 0x%02x (%u-%04x)\n",
+		nport, rxport->ser.client->addr,
+		rxport->ser.client->adapter->nr, rxport->ser.client->addr);
+
+	return 0;
+}
+
+static void ub960_rxport_remove_serializer(struct ub960_data *priv, u8 nport)
+{
+	struct ub960_rxport *rxport = priv->rxports[nport];
+
+	i2c_unregister_device(rxport->ser.client);
+	rxport->ser.client = NULL;
+}
+
+/* Add serializer i2c devices for all initialized ports */
+static int ub960_rxport_add_serializers(struct ub960_data *priv)
+{
+	unsigned int nport;
+	int ret;
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+
+		if (!rxport)
+			continue;
+
+		ret = ub960_rxport_add_serializer(priv, nport);
+		if (ret)
+			goto err_remove_sers;
+	}
+
+	return 0;
+
+err_remove_sers:
+	while (nport--) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+
+		if (!rxport)
+			continue;
+
+		ub960_rxport_remove_serializer(priv, nport);
+	}
+
+	return ret;
+}
+
+static void ub960_rxport_remove_serializers(struct ub960_data *priv)
+{
+	unsigned int nport;
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+
+		if (!rxport)
+			continue;
+
+		ub960_rxport_remove_serializer(priv, nport);
+	}
+}
+
+static void ub960_init_tx_port(struct ub960_data *priv,
+			       struct ub960_txport *txport)
+{
+	unsigned int nport = txport->nport;
+	u8 csi_ctl = 0;
+
+	/*
+	 * From the datasheet: "initial CSI Skew-Calibration
+	 * sequence [...] should be set when operating at 1.6 Gbps"
+	 */
+	if (priv->tx_data_rate == MHZ(1600))
+		csi_ctl |= UB960_TR_CSI_CTL_CSI_CAL_EN;
+
+	csi_ctl |= (4 - txport->num_data_lanes) << 4;
+
+	ub960_txport_write(priv, nport, UB960_TR_CSI_CTL, csi_ctl);
+}
+
+static int ub960_init_tx_ports(struct ub960_data *priv)
+{
+	unsigned int nport;
+	u8 speed_select;
+	u8 pll_div;
+
+	/* TX ports */
+
+	switch (priv->tx_data_rate) {
+	case MHZ(1600):
+	default:
+		speed_select = 0;
+		pll_div = 0x10;
+		break;
+	case MHZ(1200):
+		speed_select = 1;
+		break;
+	case MHZ(800):
+		speed_select = 2;
+		pll_div = 0x10;
+		break;
+	case MHZ(400):
+		speed_select = 3;
+		pll_div = 0x10;
+		break;
+	}
+
+	ub960_write(priv, UB960_SR_CSI_PLL_CTL, speed_select);
+
+	if (priv->hw_data->is_ub9702) {
+		ub960_write(priv, UB960_SR_CSI_PLL_DIV, pll_div);
+
+		switch (priv->tx_data_rate) {
+		case MHZ(1600):
+		default:
+			ub960_write_ind(priv, UB960_IND_TARGET_CSI_ANA, 0x92, 0x80);
+			ub960_write_ind(priv, UB960_IND_TARGET_CSI_ANA, 0x4b, 0x2a);
+			break;
+		case MHZ(800):
+			ub960_write_ind(priv, UB960_IND_TARGET_CSI_ANA, 0x92, 0x90);
+			ub960_write_ind(priv, UB960_IND_TARGET_CSI_ANA, 0x4f, 0x2a);
+			ub960_write_ind(priv, UB960_IND_TARGET_CSI_ANA, 0x4b, 0x2a);
+			break;
+		case MHZ(400):
+			ub960_write_ind(priv, UB960_IND_TARGET_CSI_ANA, 0x92, 0xa0);
+			break;
+		}
+	}
+
+	for (nport = 0; nport < priv->hw_data->num_txports; nport++) {
+		struct ub960_txport *txport = priv->txports[nport];
+
+		if (!txport)
+			continue;
+
+		ub960_init_tx_port(priv, txport);
+	}
+
+	return 0;
+}
+
+static void ub960_init_rx_port_ub960(struct ub960_data *priv,
+				     struct ub960_rxport *rxport)
+{
+	unsigned int nport = rxport->nport;
+	u32 bc_freq_val;
+
+	/*
+	 * Back channel frequency select.
+	 * Override FREQ_SELECT from the strap.
+	 * 0 - 2.5 Mbps (DS90UB913A-Q1 / DS90UB933-Q1)
+	 * 2 - 10 Mbps
+	 * 6 - 50 Mbps (DS90UB953-Q1)
+	 *
+	 * Note that changing this setting will result in some errors on the back
+	 * channel for a short period of time.
+	 */
+
+	switch (rxport->rx_mode) {
+	case RXPORT_MODE_RAW10:
+	case RXPORT_MODE_RAW12_HF:
+	case RXPORT_MODE_RAW12_LF:
+		bc_freq_val = 0;
+		break;
+
+	case RXPORT_MODE_CSI2_ASYNC:
+		bc_freq_val = 2;
+		break;
+
+	case RXPORT_MODE_CSI2_SYNC:
+		bc_freq_val = 6;
+		break;
+
+	default:
+		return;
+	}
+
+	ub960_rxport_update_bits(priv, nport, UB960_RR_BCC_CONFIG,
+				 UB960_RR_BCC_CONFIG_BC_FREQ_SEL_MASK,
+				 bc_freq_val);
+
+	switch (rxport->rx_mode) {
+	case RXPORT_MODE_RAW10:
+		/* FPD3_MODE = RAW10 Mode (DS90UB913A-Q1 / DS90UB933-Q1 compatible) */
+		ub960_rxport_update_bits(priv, nport, UB960_RR_PORT_CONFIG,
+					 UB960_RR_PORT_CONFIG_FPD3_MODE_MASK,
+					 0x3);
+
+		/*
+		 * RAW10_8BIT_CTL = 0b10 : 8-bit processing using upper 8 bits
+		 */
+		ub960_rxport_update_bits(priv, nport, UB960_RR_PORT_CONFIG2,
+			UB960_RR_PORT_CONFIG2_RAW10_8BIT_CTL_MASK,
+			0x2 << UB960_RR_PORT_CONFIG2_RAW10_8BIT_CTL_SHIFT);
+
+		break;
+
+	case RXPORT_MODE_RAW12_HF:
+	case RXPORT_MODE_RAW12_LF:
+		/* Not implemented */
+		return;
+
+	case RXPORT_MODE_CSI2_SYNC:
+	case RXPORT_MODE_CSI2_ASYNC:
+		/* CSI-2 Mode (DS90UB953-Q1 compatible) */
+		ub960_rxport_update_bits(priv, nport, UB960_RR_PORT_CONFIG, 0x3,
+					 0x0);
+
+		break;
+	}
+
+	/* LV_POLARITY & FV_POLARITY */
+	ub960_rxport_update_bits(priv, nport, UB960_RR_PORT_CONFIG2, 0x3,
+				 rxport->lv_fv_pol);
+
+	/* Enable all interrupt sources from this port */
+	ub960_rxport_write(priv, nport, UB960_RR_PORT_ICR_HI, 0x07);
+	ub960_rxport_write(priv, nport, UB960_RR_PORT_ICR_LO, 0x7f);
+
+	/* Enable I2C_PASS_THROUGH */
+	ub960_rxport_update_bits(priv, nport, UB960_RR_BCC_CONFIG,
+				 UB960_RR_BCC_CONFIG_I2C_PASS_THROUGH,
+				 UB960_RR_BCC_CONFIG_I2C_PASS_THROUGH);
+
+	/* Enable I2C communication to the serializer via the alias addr */
+	ub960_rxport_write(priv, nport, UB960_RR_SER_ALIAS_ID,
+			   rxport->ser.alias << 1);
+
+	/* Configure EQ related settings */
+	ub960_rxport_config_eq(priv, nport);
+
+	/* Enable RX port */
+	ub960_update_bits(priv, UB960_SR_RX_PORT_CTL, BIT(nport), BIT(nport));
+}
+
+static void ub960_init_rx_port_ub9702_fpd3(struct ub960_data *priv,
+					   struct ub960_rxport *rxport)
+{
+	unsigned int nport = rxport->nport;
+	u8 bc_freq_val;
+	u8 fpd_func_mode;
+
+	switch (rxport->rx_mode) {
+	case RXPORT_MODE_RAW10:
+		bc_freq_val = 0;
+		fpd_func_mode = 5;
+		break;
+
+	case RXPORT_MODE_RAW12_HF:
+		bc_freq_val = 0;
+		fpd_func_mode = 4;
+		break;
+
+	case RXPORT_MODE_RAW12_LF:
+		bc_freq_val = 0;
+		fpd_func_mode = 6;
+		break;
+
+	case RXPORT_MODE_CSI2_SYNC:
+		bc_freq_val = 6;
+		fpd_func_mode = 2;
+		break;
+
+	case RXPORT_MODE_CSI2_ASYNC:
+		bc_freq_val = 2;
+		fpd_func_mode = 2;
+		break;
+
+	default:
+		return;
+	}
+
+	ub960_rxport_update_bits(priv, nport, UB960_RR_BCC_CONFIG, 0x7,
+				 bc_freq_val);
+	ub960_rxport_write(priv, nport, UB960_RR_CHANNEL_MODE, fpd_func_mode);
+
+	/* set serdes_eq_mode = 1 */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0xa8, 0x80);
+
+	/* enable serdes driver */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x0d, 0x7f);
+
+	/* set serdes_eq_offset=4 */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x2b, 0x04);
+
+	/* init default serdes_eq_max in 0xa9 */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0xa9, 0x23);
+
+	/* init serdes_eq_min in 0xaa */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0xaa, 0);
+
+	/* serdes_driver_ctl2 control: DS90UB953-Q1/DS90UB933-Q1/DS90UB913A-Q1 */
+	ub960_ind_update_bits(priv, UB960_IND_TARGET_RX_ANA(nport), 0x1b,
+			      BIT(3), BIT(3));
+
+	/* RX port to half-rate */
+	ub960_update_bits(priv, UB960_SR_FPD_RATE_CFG, 0x3 << (nport * 2),
+			  BIT(nport * 2));
+}
+
+static void ub960_init_rx_port_ub9702_fpd4_aeq(struct ub960_data *priv,
+					       struct ub960_rxport *rxport)
+{
+	unsigned int nport = rxport->nport;
+	bool first_time_power_up = true;
+
+	if (first_time_power_up) {
+		u8 v;
+
+		/* AEQ init */
+		ub960_read_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x2c, &v);
+
+		ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x27, v);
+		ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x28, v + 1);
+
+		ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x2b, 0x00);
+	}
+
+	/* enable serdes_eq_ctl2 */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x9e, 0x00);
+
+	/* enable serdes_eq_ctl1 */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x90, 0x40);
+
+	/* enable serdes_eq_en */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x2e, 0x40);
+
+	/* disable serdes_eq_override */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0xf0, 0x00);
+
+	/* disable serdes_gain_override */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x71, 0x00);
+}
+
+static void ub960_init_rx_port_ub9702_fpd4(struct ub960_data *priv,
+					   struct ub960_rxport *rxport)
+{
+	unsigned int nport = rxport->nport;
+	u8 bc_freq_val;
+
+	switch (rxport->rx_mode) {
+	case RXPORT_MODE_RAW10:
+		bc_freq_val = 0;
+		break;
+
+	case RXPORT_MODE_RAW12_HF:
+		bc_freq_val = 0;
+		break;
+
+	case RXPORT_MODE_RAW12_LF:
+		bc_freq_val = 0;
+		break;
+
+	case RXPORT_MODE_CSI2_SYNC:
+		bc_freq_val = 6;
+		break;
+
+	case RXPORT_MODE_CSI2_ASYNC:
+		bc_freq_val = 2;
+		break;
+
+	default:
+		return;
+	}
+
+	ub960_rxport_update_bits(priv, nport, UB960_RR_BCC_CONFIG, 0x7,
+				 bc_freq_val);
+
+	/* FPD4 Sync Mode */
+	ub960_rxport_write(priv, nport, UB960_RR_CHANNEL_MODE, 0);
+
+	/* add serdes_eq_offset of 4 */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x2b, 0x04);
+
+	/* FPD4 serdes_start_eq in 0x27: assign default */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x27, 0x0);
+	/* FPD4 serdes_end_eq in 0x28: assign default */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x28, 0x23);
+
+	/* set serdes_driver_mode into FPD IV mode */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x04, 0x00);
+	/* set FPD PBC drv into FPD IV mode */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x1b, 0x00);
+
+	/* set serdes_system_init to 0x2f */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x21, 0x2f);
+	/* set serdes_system_rst in reset mode */
+	ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x25, 0xc1);
+
+	/* RX port to 7.55G mode */
+	ub960_update_bits(priv, UB960_SR_FPD_RATE_CFG, 0x3 << (nport * 2),
+			  0 << (nport * 2));
+
+	ub960_init_rx_port_ub9702_fpd4_aeq(priv, rxport);
+}
+
+static void ub960_init_rx_port_ub9702(struct ub960_data *priv,
+				      struct ub960_rxport *rxport)
+{
+	unsigned int nport = rxport->nport;
+
+	if (rxport->cdr_mode == RXPORT_CDR_FPD3)
+		ub960_init_rx_port_ub9702_fpd3(priv, rxport);
+	else /* RXPORT_CDR_FPD4 */
+		ub960_init_rx_port_ub9702_fpd4(priv, rxport);
+
+	switch (rxport->rx_mode) {
+	case RXPORT_MODE_RAW10:
+		/*
+		 * RAW10_8BIT_CTL = 0b11 : 8-bit processing using lower 8 bits
+		 * 0b10 : 8-bit processing using upper 8 bits
+		 */
+		ub960_rxport_update_bits(priv, nport, UB960_RR_PORT_CONFIG2,
+					 0x3 << 6, 0x2 << 6);
+
+		break;
+
+	case RXPORT_MODE_RAW12_HF:
+	case RXPORT_MODE_RAW12_LF:
+		/* Not implemented */
+		return;
+
+	case RXPORT_MODE_CSI2_SYNC:
+	case RXPORT_MODE_CSI2_ASYNC:
+
+		break;
+	}
+
+	/* LV_POLARITY & FV_POLARITY */
+	ub960_rxport_update_bits(priv, nport, UB960_RR_PORT_CONFIG2, 0x3,
+				 rxport->lv_fv_pol);
+
+	/* Enable all interrupt sources from this port */
+	ub960_rxport_write(priv, nport, UB960_RR_PORT_ICR_HI, 0x07);
+	ub960_rxport_write(priv, nport, UB960_RR_PORT_ICR_LO, 0x7f);
+
+	/* Enable I2C_PASS_THROUGH */
+	ub960_rxport_update_bits(priv, nport, UB960_RR_BCC_CONFIG,
+				 UB960_RR_BCC_CONFIG_I2C_PASS_THROUGH,
+				 UB960_RR_BCC_CONFIG_I2C_PASS_THROUGH);
+
+	/* Enable I2C communication to the serializer via the alias addr */
+	ub960_rxport_write(priv, nport, UB960_RR_SER_ALIAS_ID,
+			   rxport->ser.alias << 1);
+
+	/* Enable RX port */
+	ub960_update_bits(priv, UB960_SR_RX_PORT_CTL, BIT(nport), BIT(nport));
+
+	if (rxport->cdr_mode == RXPORT_CDR_FPD4) {
+		/* unreset 960 AEQ */
+		ub960_write_ind(priv, UB960_IND_TARGET_RX_ANA(nport), 0x25, 0x41);
+	}
+}
+
+static int ub960_init_rx_ports(struct ub960_data *priv)
+{
+	unsigned int nport;
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+
+		if (!rxport)
+			continue;
+
+		if (priv->hw_data->is_ub9702)
+			ub960_init_rx_port_ub9702(priv, rxport);
+		else
+			ub960_init_rx_port_ub960(priv, rxport);
+	}
+
+	return 0;
+}
+
+static void ub960_rxport_handle_events(struct ub960_data *priv, u8 nport)
+{
+	struct device *dev = &priv->client->dev;
+	u8 rx_port_sts1;
+	u8 rx_port_sts2;
+	u8 csi_rx_sts;
+	u8 bcc_sts;
+	int ret = 0;
+
+	/* Read interrupts (also clears most of them) */
+	if (!ret)
+		ret = ub960_rxport_read(priv, nport, UB960_RR_RX_PORT_STS1,
+					&rx_port_sts1);
+	if (!ret)
+		ret = ub960_rxport_read(priv, nport, UB960_RR_RX_PORT_STS2,
+					&rx_port_sts2);
+	if (!ret)
+		ret = ub960_rxport_read(priv, nport, UB960_RR_CSI_RX_STS,
+					&csi_rx_sts);
+	if (!ret)
+		ret = ub960_rxport_read(priv, nport, UB960_RR_BCC_STATUS,
+					&bcc_sts);
+
+	if (ret)
+		return;
+
+	if (rx_port_sts1 & UB960_RR_RX_PORT_STS1_PARITY_ERROR) {
+		u16 v;
+
+		ret = ub960_rxport_read16(priv, nport, UB960_RR_RX_PAR_ERR_HI,
+					  &v);
+		if (!ret)
+			dev_err(dev, "rx%u parity errors: %u\n", nport, v);
+	}
+
+	if (rx_port_sts1 & UB960_RR_RX_PORT_STS1_BCC_CRC_ERROR)
+		dev_err(dev, "rx%u BCC CRC error\n", nport);
+
+	if (rx_port_sts1 & UB960_RR_RX_PORT_STS1_BCC_SEQ_ERROR)
+		dev_err(dev, "rx%u BCC SEQ error\n", nport);
+
+	if (rx_port_sts2 & UB960_RR_RX_PORT_STS2_LINE_LEN_UNSTABLE)
+		dev_err(dev, "rx%u line length unstable\n", nport);
+
+	if (rx_port_sts2 & UB960_RR_RX_PORT_STS2_FPD3_ENCODE_ERROR)
+		dev_err(dev, "rx%u FPD3 encode error\n", nport);
+
+	if (rx_port_sts2 & UB960_RR_RX_PORT_STS2_BUFFER_ERROR)
+		dev_err(dev, "rx%u buffer error\n", nport);
+
+	if (csi_rx_sts)
+		dev_err(dev, "rx%u CSI error: %#02x\n", nport, csi_rx_sts);
+
+	if (csi_rx_sts & UB960_RR_CSI_RX_STS_ECC1_ERR)
+		dev_err(dev, "rx%u CSI ECC1 error\n", nport);
+
+	if (csi_rx_sts & UB960_RR_CSI_RX_STS_ECC2_ERR)
+		dev_err(dev, "rx%u CSI ECC2 error\n", nport);
+
+	if (csi_rx_sts & UB960_RR_CSI_RX_STS_CKSUM_ERR)
+		dev_err(dev, "rx%u CSI checksum error\n", nport);
+
+	if (csi_rx_sts & UB960_RR_CSI_RX_STS_LENGTH_ERR)
+		dev_err(dev, "rx%u CSI length error\n", nport);
+
+	if (bcc_sts)
+		dev_err(dev, "rx%u BCC error: %#02x\n", nport, bcc_sts);
+
+	if (bcc_sts & UB960_RR_BCC_STATUS_RESP_ERR)
+		dev_err(dev, "rx%u BCC response error", nport);
+
+	if (bcc_sts & UB960_RR_BCC_STATUS_SLAVE_TO)
+		dev_err(dev, "rx%u BCC slave timeout", nport);
+
+	if (bcc_sts & UB960_RR_BCC_STATUS_SLAVE_ERR)
+		dev_err(dev, "rx%u BCC slave error", nport);
+
+	if (bcc_sts & UB960_RR_BCC_STATUS_MASTER_TO)
+		dev_err(dev, "rx%u BCC master timeout", nport);
+
+	if (bcc_sts & UB960_RR_BCC_STATUS_MASTER_ERR)
+		dev_err(dev, "rx%u BCC master error", nport);
+
+	if (bcc_sts & UB960_RR_BCC_STATUS_SEQ_ERROR)
+		dev_err(dev, "rx%u BCC sequence error", nport);
+
+	if (rx_port_sts2 & UB960_RR_RX_PORT_STS2_LINE_LEN_CHG) {
+		u16 v;
+
+		ret = ub960_rxport_read16(priv, nport, UB960_RR_LINE_LEN_1, &v);
+		if (!ret)
+			dev_dbg(dev, "rx%u line len changed: %u\n", nport, v);
+	}
+
+	if (rx_port_sts2 & UB960_RR_RX_PORT_STS2_LINE_CNT_CHG) {
+		u16 v;
+
+		ret = ub960_rxport_read16(priv, nport, UB960_RR_LINE_COUNT_HI,
+					  &v);
+		if (!ret)
+			dev_dbg(dev, "rx%u line count changed: %u\n", nport, v);
+	}
+
+	if (rx_port_sts1 & UB960_RR_RX_PORT_STS1_LOCK_STS_CHG) {
+		dev_dbg(dev, "rx%u: %s, %s, %s, %s\n", nport,
+			(rx_port_sts1 & UB960_RR_RX_PORT_STS1_LOCK_STS) ?
+				"locked" :
+				"unlocked",
+			(rx_port_sts1 & UB960_RR_RX_PORT_STS1_PORT_PASS) ?
+				"passed" :
+				"not passed",
+			(rx_port_sts2 & UB960_RR_RX_PORT_STS2_CABLE_FAULT) ?
+				"no clock" :
+				"clock ok",
+			(rx_port_sts2 & UB960_RR_RX_PORT_STS2_FREQ_STABLE) ?
+				"stable freq" :
+				"unstable freq");
+	}
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2
+ */
+
+/*
+ * The current implementation only supports a simple VC mapping, where all VCs
+ * from a one RX port will be mapped to the same VC. Also, the hardware
+ * dictates that all streams from an RX port must go to a single TX port.
+ *
+ * This function decides the target VC numbers for each RX port with a simple
+ * algorithm, so that for each TX port, we get VC numbers starting from 0,
+ * and counting up.
+ *
+ * E.g. if all four RX ports are in use, of which the first two go to the
+ * first TX port and the secont two go to the second TX port, we would get
+ * the following VCs for the four RX ports: 0, 1, 0, 1.
+ *
+ * TODO: implement a more sophisticated VC mapping. As the driver cannot know
+ * what VCs the sinks expect (say, an FPGA with hardcoded VC routing), this
+ * probably needs to be somehow configurable. Device tree?
+ */
+static void ub960_get_vc_maps(struct ub960_data *priv,
+			      struct v4l2_subdev_state *state, u8 *vc)
+{
+	u8 cur_vc[UB960_MAX_TX_NPORTS] = {};
+	struct v4l2_subdev_route *route;
+	u8 handled_mask = 0;
+
+	for_each_active_route(&state->routing, route) {
+		unsigned int rx, tx;
+
+		rx = ub960_pad_to_port(priv, route->sink_pad);
+		if (BIT(rx) & handled_mask)
+			continue;
+
+		tx = ub960_pad_to_port(priv, route->source_pad);
+
+		vc[rx] = cur_vc[tx]++;
+		handled_mask |= BIT(rx);
+	}
+}
+
+static int ub960_enable_tx_port(struct ub960_data *priv, unsigned int nport)
+{
+	struct device *dev = &priv->client->dev;
+
+	dev_dbg(dev, "enable TX port %u\n", nport);
+
+	return ub960_txport_update_bits(priv, nport, UB960_TR_CSI_CTL,
+					UB960_TR_CSI_CTL_CSI_ENABLE,
+					UB960_TR_CSI_CTL_CSI_ENABLE);
+}
+
+static void ub960_disable_tx_port(struct ub960_data *priv, unsigned int nport)
+{
+	struct device *dev = &priv->client->dev;
+
+	dev_dbg(dev, "disable TX port %u\n", nport);
+
+	ub960_txport_update_bits(priv, nport, UB960_TR_CSI_CTL,
+				 UB960_TR_CSI_CTL_CSI_ENABLE, 0);
+}
+
+static int ub960_enable_rx_port(struct ub960_data *priv, unsigned int nport)
+{
+	struct device *dev = &priv->client->dev;
+
+	dev_dbg(dev, "enable RX port %u\n", nport);
+
+	/* Enable forwarding */
+	return ub960_update_bits(priv, UB960_SR_FWD_CTL1, BIT(4 + nport), 0);
+}
+
+static void ub960_disable_rx_port(struct ub960_data *priv, unsigned int nport)
+{
+	struct device *dev = &priv->client->dev;
+
+	dev_dbg(dev, "disable RX port %u\n", nport);
+
+	/* Disable forwarding */
+	ub960_update_bits(priv, UB960_SR_FWD_CTL1, BIT(4 + nport),
+			  BIT(4 + nport));
+}
+
+/*
+ * The driver only supports using a single VC for each source. This function
+ * checks that each source only provides streams using a single VC.
+ */
+static int ub960_validate_stream_vcs(struct ub960_data *priv)
+{
+	unsigned int nport;
+	unsigned int i;
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+		struct v4l2_mbus_frame_desc desc;
+		int ret;
+		u8 vc;
+
+		if (!rxport)
+			continue;
+
+		ret = v4l2_subdev_call(rxport->source.sd, pad, get_frame_desc,
+				       rxport->source.pad, &desc);
+		if (ret)
+			return ret;
+
+		if (desc.type != V4L2_MBUS_FRAME_DESC_TYPE_CSI2)
+			continue;
+
+		if (desc.num_entries == 0)
+			continue;
+
+		vc = desc.entry[0].bus.csi2.vc;
+
+		for (i = 1; i < desc.num_entries; i++) {
+			if (vc == desc.entry[i].bus.csi2.vc)
+				continue;
+
+			dev_err(&priv->client->dev,
+				"rx%u: source with multiple virtual-channels is not supported\n",
+				nport);
+			return -ENODEV;
+		}
+	}
+
+	return 0;
+}
+
+static int ub960_configure_ports_for_streaming(struct ub960_data *priv,
+					       struct v4l2_subdev_state *state)
+{
+	u8 fwd_ctl;
+	struct {
+		u32 num_streams;
+		u8 pixel_dt;
+		u8 meta_dt;
+		u32 meta_lines;
+		u32 tx_port;
+	} rx_data[UB960_MAX_RX_NPORTS] = {};
+	u8 vc_map[UB960_MAX_RX_NPORTS] = {};
+	struct v4l2_subdev_route *route;
+	unsigned int nport;
+	int ret;
+
+	ret = ub960_validate_stream_vcs(priv);
+	if (ret)
+		return ret;
+
+	ub960_get_vc_maps(priv, state, vc_map);
+
+	for_each_active_route(&state->routing, route) {
+		struct ub960_rxport *rxport;
+		struct ub960_txport *txport;
+		struct v4l2_mbus_framefmt *fmt;
+		const struct ub960_format_info *ub960_fmt;
+		unsigned int nport;
+
+		nport = ub960_pad_to_port(priv, route->sink_pad);
+
+		rxport = priv->rxports[nport];
+		if (!rxport)
+			return -EINVAL;
+
+		txport = priv->txports[ub960_pad_to_port(priv, route->source_pad)];
+		if (!txport)
+			return -EINVAL;
+
+		rx_data[nport].tx_port = ub960_pad_to_port(priv, route->source_pad);
+
+		rx_data[nport].num_streams++;
+
+		/* For the rest, we are only interested in parallel busses */
+		if (rxport->rx_mode == RXPORT_MODE_CSI2_SYNC ||
+		    rxport->rx_mode == RXPORT_MODE_CSI2_ASYNC)
+			continue;
+
+		if (rx_data[nport].num_streams > 2)
+			return -EPIPE;
+
+		fmt = v4l2_subdev_state_get_stream_format(state,
+							  route->sink_pad,
+							  route->sink_stream);
+		if (!fmt)
+			return -EPIPE;
+
+		ub960_fmt = ub960_find_format(fmt->code);
+		if (!ub960_fmt)
+			return -EPIPE;
+
+		if (ub960_fmt->meta) {
+			if (fmt->height > 3) {
+				dev_err(&priv->client->dev,
+					"rx%u: unsupported metadata height %u\n",
+					nport, fmt->height);
+				return -EPIPE;
+			}
+
+			rx_data[nport].meta_dt = ub960_fmt->datatype;
+			rx_data[nport].meta_lines = fmt->height;
+		} else {
+			rx_data[nport].pixel_dt = ub960_fmt->datatype;
+		}
+	}
+
+	/* Configure RX ports */
+
+	fwd_ctl = 0;
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+		u8 vc = vc_map[nport];
+
+		if (rx_data[nport].num_streams == 0)
+			continue;
+
+		switch (rxport->rx_mode) {
+		case RXPORT_MODE_RAW10:
+			ub960_rxport_write(priv, nport, UB960_RR_RAW10_ID,
+				rx_data[nport].pixel_dt | (vc << UB960_RR_RAW10_ID_VC_SHIFT));
+
+			ub960_rxport_write(priv, rxport->nport,
+				UB960_RR_RAW_EMBED_DTYPE,
+				(rx_data[nport].meta_lines << UB960_RR_RAW_EMBED_DTYPE_LINES_SHIFT) |
+					rx_data[nport].meta_dt);
+
+			break;
+
+		case RXPORT_MODE_RAW12_HF:
+		case RXPORT_MODE_RAW12_LF:
+			/* Not implemented */
+			break;
+
+		case RXPORT_MODE_CSI2_SYNC:
+		case RXPORT_MODE_CSI2_ASYNC:
+			if (!priv->hw_data->is_ub9702) {
+				/* Map all VCs from this port to the same VC */
+				ub960_rxport_write(priv, nport, UB960_RR_CSI_VC_MAP,
+						   (vc << UB960_RR_CSI_VC_MAP_SHIFT(3)) |
+						   (vc << UB960_RR_CSI_VC_MAP_SHIFT(2)) |
+						   (vc << UB960_RR_CSI_VC_MAP_SHIFT(1)) |
+						   (vc << UB960_RR_CSI_VC_MAP_SHIFT(0)));
+			} else {
+				unsigned int i;
+
+				/* Map all VCs from this port to VC(nport) */
+				for (i = 0; i < 8; i++)
+					ub960_rxport_write(priv, nport,
+							   UB960_RR_VC_ID_MAP(i),
+							   nport);
+			}
+
+			break;
+		}
+
+		/* Forwarding */
+
+		fwd_ctl |= BIT(4 + nport); /* forward disable */
+
+		if (rx_data[nport].tx_port == 1)
+			fwd_ctl |= BIT(nport); /* forward to TX1 */
+		else
+			fwd_ctl &= ~BIT(nport); /* forward to TX0 */
+	}
+
+	ub960_write(priv, UB960_SR_FWD_CTL1, fwd_ctl);
+
+	return 0;
+}
+
+static void ub960_update_streaming_status(struct ub960_data *priv)
+{
+	unsigned int i;
+
+	for (i = 0; i < UB960_MAX_NPORTS; i++) {
+		if (priv->stream_enable_mask[i])
+			break;
+	}
+
+	priv->streaming = i < UB960_MAX_NPORTS;
+}
+
+static int ub960_enable_streams(struct v4l2_subdev *sd,
+				struct v4l2_subdev_state *state, u32 source_pad,
+				u64 source_streams_mask)
+{
+	struct ub960_data *priv = sd_to_ub960(sd);
+	struct device *dev = &priv->client->dev;
+	u64 sink_streams[UB960_MAX_RX_NPORTS] = {};
+	struct v4l2_subdev_route *route;
+	unsigned int failed_port;
+	unsigned int nport;
+	int ret;
+
+	if (!priv->streaming) {
+		dev_dbg(dev, "Prepare for streaming\n");
+		ret = ub960_configure_ports_for_streaming(priv, state);
+		if (ret)
+			return ret;
+	}
+
+	/* Enable TX port if not yet enabled */
+	if (!priv->stream_enable_mask[source_pad]) {
+		ret = ub960_enable_tx_port(priv,
+					   ub960_pad_to_port(priv, source_pad));
+		if (ret)
+			return ret;
+	}
+
+	priv->stream_enable_mask[source_pad] |= source_streams_mask;
+
+	/* Collect sink streams per pad which we need to enable */
+	for_each_active_route(&state->routing, route) {
+		if (route->source_pad != source_pad)
+			continue;
+
+		if (!(source_streams_mask & BIT_ULL(route->source_stream)))
+			continue;
+
+		nport = ub960_pad_to_port(priv, route->sink_pad);
+
+		sink_streams[nport] |= BIT_ULL(route->sink_stream);
+	}
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		if (!sink_streams[nport])
+			continue;
+
+		/* Enable the RX port if not yet enabled */
+		if (!priv->stream_enable_mask[nport]) {
+			ret = ub960_enable_rx_port(priv, nport);
+			if (ret) {
+				failed_port = nport;
+				goto err;
+			}
+		}
+
+		priv->stream_enable_mask[nport] |= sink_streams[nport];
+
+		dev_dbg(dev, "enable RX port %u streams %#llx\n", nport,
+			sink_streams[nport]);
+
+		ret = v4l2_subdev_enable_streams(
+			priv->rxports[nport]->source.sd,
+			priv->rxports[nport]->source.pad,
+			sink_streams[nport]);
+		if (ret) {
+			priv->stream_enable_mask[nport] &= ~sink_streams[nport];
+
+			if (!priv->stream_enable_mask[nport])
+				ub960_disable_rx_port(priv, nport);
+
+			failed_port = nport;
+			goto err;
+		}
+	}
+
+	priv->streaming = true;
+
+	return 0;
+
+err:
+	for (nport = 0; nport < failed_port; nport++) {
+		if (!sink_streams[nport])
+			continue;
+
+		dev_dbg(dev, "disable RX port %u streams %#llx\n", nport,
+			sink_streams[nport]);
+
+		ret = v4l2_subdev_disable_streams(
+			priv->rxports[nport]->source.sd,
+			priv->rxports[nport]->source.pad,
+			sink_streams[nport]);
+		if (ret)
+			dev_err(dev, "Failed to disable streams: %d\n", ret);
+
+		priv->stream_enable_mask[nport] &= ~sink_streams[nport];
+
+		/* Disable RX port if no active streams */
+		if (!priv->stream_enable_mask[nport])
+			ub960_disable_rx_port(priv, nport);
+	}
+
+	priv->stream_enable_mask[source_pad] &= ~source_streams_mask;
+
+	if (!priv->stream_enable_mask[source_pad])
+		ub960_disable_tx_port(priv,
+				      ub960_pad_to_port(priv, source_pad));
+
+	ub960_update_streaming_status(priv);
+
+	return ret;
+}
+
+static int ub960_disable_streams(struct v4l2_subdev *sd,
+				 struct v4l2_subdev_state *state,
+				 u32 source_pad, u64 source_streams_mask)
+{
+	struct ub960_data *priv = sd_to_ub960(sd);
+	struct device *dev = &priv->client->dev;
+	u64 sink_streams[UB960_MAX_RX_NPORTS] = {};
+	struct v4l2_subdev_route *route;
+	unsigned int nport;
+	int ret;
+
+	/* Collect sink streams per pad which we need to disable */
+	for_each_active_route(&state->routing, route) {
+		if (route->source_pad != source_pad)
+			continue;
+
+		if (!(source_streams_mask & BIT_ULL(route->source_stream)))
+			continue;
+
+		nport = ub960_pad_to_port(priv, route->sink_pad);
+
+		sink_streams[nport] |= BIT_ULL(route->sink_stream);
+	}
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		if (!sink_streams[nport])
+			continue;
+
+		dev_dbg(dev, "disable RX port %u streams %#llx\n", nport,
+			sink_streams[nport]);
+
+		ret = v4l2_subdev_disable_streams(
+			priv->rxports[nport]->source.sd,
+			priv->rxports[nport]->source.pad,
+			sink_streams[nport]);
+		if (ret)
+			dev_err(dev, "Failed to disable streams: %d\n", ret);
+
+		priv->stream_enable_mask[nport] &= ~sink_streams[nport];
+
+		/* Disable RX port if no active streams */
+		if (!priv->stream_enable_mask[nport])
+			ub960_disable_rx_port(priv, nport);
+	}
+
+	/* Disable TX port if no active streams */
+
+	priv->stream_enable_mask[source_pad] &= ~source_streams_mask;
+
+	if (!priv->stream_enable_mask[source_pad])
+		ub960_disable_tx_port(priv,
+				      ub960_pad_to_port(priv, source_pad));
+
+	ub960_update_streaming_status(priv);
+
+	return 0;
+}
+
+static int _ub960_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_1X16,
+		.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 -E2BIG;
+
+	ret = v4l2_subdev_routing_validate(sd, routing,
+					   V4L2_SUBDEV_ROUTING_ONLY_1_TO_1 |
+					   V4L2_SUBDEV_ROUTING_NO_SINK_STREAM_MIX);
+	if (ret)
+		return ret;
+
+	ret = v4l2_subdev_set_routing_with_fmt(sd, state, routing, &format);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int ub960_set_routing(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_state *state,
+			     enum v4l2_subdev_format_whence which,
+			     struct v4l2_subdev_krouting *routing)
+{
+	struct ub960_data *priv = sd_to_ub960(sd);
+
+	if (which == V4L2_SUBDEV_FORMAT_ACTIVE && priv->streaming)
+		return -EBUSY;
+
+	return _ub960_set_routing(sd, state, routing);
+}
+
+static int ub960_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
+				struct v4l2_mbus_frame_desc *fd)
+{
+	struct ub960_data *priv = sd_to_ub960(sd);
+	struct v4l2_subdev_route *route;
+	struct v4l2_subdev_state *state;
+	int ret = 0;
+	struct device *dev = &priv->client->dev;
+	u8 vc_map[UB960_MAX_RX_NPORTS] = {};
+
+	if (!ub960_pad_is_source(priv, pad))
+		return -EINVAL;
+
+	memset(fd, 0, sizeof(*fd));
+
+	fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
+
+	state = v4l2_subdev_lock_and_get_active_state(&priv->sd);
+
+	ub960_get_vc_maps(priv, state, vc_map);
+
+	for_each_active_route(&state->routing, route) {
+		struct v4l2_mbus_frame_desc_entry *source_entry = NULL;
+		struct v4l2_mbus_frame_desc source_fd;
+		unsigned int nport;
+		unsigned int i;
+
+		if (route->source_pad != pad)
+			continue;
+
+		nport = ub960_pad_to_port(priv, route->sink_pad);
+
+		ret = v4l2_subdev_call(priv->rxports[nport]->source.sd, pad,
+				       get_frame_desc,
+				       priv->rxports[nport]->source.pad,
+				       &source_fd);
+		if (ret) {
+			dev_err(dev,
+				"Failed to get source frame desc for pad %u\n",
+				route->sink_pad);
+			goto out_unlock;
+		}
+
+		for (i = 0; i < source_fd.num_entries; i++) {
+			if (source_fd.entry[i].stream == route->sink_stream) {
+				source_entry = &source_fd.entry[i];
+				break;
+			}
+		}
+
+		if (!source_entry) {
+			dev_err(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_entry->flags;
+		fd->entry[fd->num_entries].length = source_entry->length;
+		fd->entry[fd->num_entries].pixelcode = source_entry->pixelcode;
+
+		fd->entry[fd->num_entries].bus.csi2.vc = vc_map[nport];
+
+		if (source_fd.type == V4L2_MBUS_FRAME_DESC_TYPE_CSI2) {
+			fd->entry[fd->num_entries].bus.csi2.dt =
+				source_entry->bus.csi2.dt;
+		} else {
+			const struct ub960_format_info *ub960_fmt;
+			struct v4l2_mbus_framefmt *fmt;
+
+			fmt = v4l2_subdev_state_get_stream_format(state, pad,
+								  route->source_stream);
+
+			if (!fmt) {
+				ret = -EINVAL;
+				goto out_unlock;
+			}
+
+			ub960_fmt = ub960_find_format(fmt->code);
+			if (!ub960_fmt) {
+				dev_err(dev, "Unable to find format\n");
+				ret = -EINVAL;
+				goto out_unlock;
+			}
+
+			fd->entry[fd->num_entries].bus.csi2.dt =
+				ub960_fmt->datatype;
+		}
+
+		fd->num_entries++;
+	}
+
+out_unlock:
+	v4l2_subdev_unlock_state(state);
+
+	return ret;
+}
+
+static int ub960_set_fmt(struct v4l2_subdev *sd,
+			 struct v4l2_subdev_state *state,
+			 struct v4l2_subdev_format *format)
+{
+	struct ub960_data *priv = sd_to_ub960(sd);
+	struct v4l2_mbus_framefmt *fmt;
+
+	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE && priv->streaming)
+		return -EBUSY;
+
+	/* No transcoding, source and sink formats must match. */
+	if (ub960_pad_is_source(priv, format->pad))
+		return v4l2_subdev_get_fmt(sd, state, format);
+
+	/*
+	 * Default to the first format if the requested media bus code isn't
+	 * supported.
+	 */
+	if (!ub960_find_format(format->format.code))
+		format->format.code = ub960_formats[0].code;
+
+	fmt = v4l2_subdev_state_get_stream_format(state, format->pad,
+						  format->stream);
+	if (!fmt)
+		return -EINVAL;
+
+	*fmt = format->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 ub960_init_cfg(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_state *state)
+{
+	struct ub960_data *priv = sd_to_ub960(sd);
+
+	struct v4l2_subdev_route routes[] = {
+		{
+			.sink_pad = 0,
+			.sink_stream = 0,
+			.source_pad = priv->hw_data->num_rxports,
+			.source_stream = 0,
+			.flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
+		},
+	};
+
+	struct v4l2_subdev_krouting routing = {
+		.num_routes = ARRAY_SIZE(routes),
+		.routes = routes,
+	};
+
+	return _ub960_set_routing(sd, state, &routing);
+}
+
+static const struct v4l2_subdev_pad_ops ub960_pad_ops = {
+	.enable_streams = ub960_enable_streams,
+	.disable_streams = ub960_disable_streams,
+
+	.set_routing = ub960_set_routing,
+	.get_frame_desc = ub960_get_frame_desc,
+
+	.get_fmt = v4l2_subdev_get_fmt,
+	.set_fmt = ub960_set_fmt,
+
+	.init_cfg = ub960_init_cfg,
+};
+
+static int ub960_log_status(struct v4l2_subdev *sd)
+{
+	struct ub960_data *priv = sd_to_ub960(sd);
+	struct device *dev = &priv->client->dev;
+	struct v4l2_subdev_state *state;
+	unsigned int nport;
+	unsigned int i;
+	u16 v16 = 0;
+	u8 v = 0;
+	u8 id[UB960_SR_FPD3_RX_ID_LEN];
+
+	state = v4l2_subdev_lock_and_get_active_state(sd);
+
+	for (i = 0; i < sizeof(id); i++)
+		ub960_read(priv, UB960_SR_FPD3_RX_ID(i), &id[i]);
+
+	dev_info(dev, "ID '%.*s'\n", sizeof(id), id);
+
+	for (nport = 0; nport < priv->hw_data->num_txports; nport++) {
+		struct ub960_txport *txport = priv->txports[nport];
+
+		dev_info(dev, "TX %u\n", nport);
+
+		if (!txport) {
+			dev_info(dev, "\tNot initialized\n");
+			continue;
+		}
+
+		ub960_txport_read(priv, nport, UB960_TR_CSI_STS, &v);
+		dev_info(dev, "\tsync %u, pass %u\n", v & (u8)BIT(1),
+			 v & (u8)BIT(0));
+
+		ub960_read16(priv, UB960_SR_CSI_FRAME_COUNT_HI(nport), &v16);
+		dev_info(dev, "\tframe counter %u\n", v16);
+
+		ub960_read16(priv, UB960_SR_CSI_FRAME_ERR_COUNT_HI(nport), &v16);
+		dev_info(dev, "\tframe error counter %u\n", v16);
+
+		ub960_read16(priv, UB960_SR_CSI_LINE_COUNT_HI(nport), &v16);
+		dev_info(dev, "\tline counter %u\n", v16);
+
+		ub960_read16(priv, UB960_SR_CSI_LINE_ERR_COUNT_HI(nport), &v16);
+		dev_info(dev, "\tline error counter %u\n", v16);
+	}
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+		u8 eq_level;
+		s8 strobe_pos;
+		unsigned int i;
+
+		dev_info(dev, "RX %u\n", nport);
+
+		if (!rxport) {
+			dev_info(dev, "\tNot initialized\n");
+			continue;
+		}
+
+		ub960_rxport_read(priv, nport, UB960_RR_RX_PORT_STS1, &v);
+
+		if (v & UB960_RR_RX_PORT_STS1_LOCK_STS)
+			dev_info(dev, "\tLocked\n");
+		else
+			dev_info(dev, "\tNot locked\n");
+
+		dev_info(dev, "\trx_port_sts1 %#02x\n", v);
+		ub960_rxport_read(priv, nport, UB960_RR_RX_PORT_STS2, &v);
+		dev_info(dev, "\trx_port_sts2 %#02x\n", v);
+
+		ub960_rxport_read16(priv, nport, UB960_RR_RX_FREQ_HIGH, &v16);
+		dev_info(dev, "\tlink freq %llu Hz\n", (v16 * 1000000ULL) >> 8);
+
+		ub960_rxport_read16(priv, nport, UB960_RR_RX_PAR_ERR_HI, &v16);
+		dev_info(dev, "\tparity errors %u\n", v16);
+
+		ub960_rxport_read16(priv, nport, UB960_RR_LINE_COUNT_HI, &v16);
+		dev_info(dev, "\tlines per frame %u\n", v16);
+
+		ub960_rxport_read16(priv, nport, UB960_RR_LINE_LEN_1, &v16);
+		dev_info(dev, "\tbytes per line %u\n", v16);
+
+		ub960_rxport_read(priv, nport, UB960_RR_CSI_ERR_COUNTER, &v);
+		dev_info(dev, "\tcsi_err_counter %u\n", v);
+
+		/* Strobe */
+
+		ub960_read(priv, UB960_XR_AEQ_CTL1, &v);
+
+		dev_info(dev, "\t%s strobe\n",
+			 (v & UB960_XR_AEQ_CTL1_AEQ_SFILTER_EN) ? "Adaptive" :
+								  "Manual");
+
+		if (v & UB960_XR_AEQ_CTL1_AEQ_SFILTER_EN) {
+			ub960_read(priv, UB960_XR_SFILTER_CFG, &v);
+
+			dev_info(dev, "\tStrobe range [%d, %d]\n",
+				 ((v >> UB960_XR_SFILTER_CFG_SFILTER_MIN_SHIFT) & 0xf) - 7,
+				 ((v >> UB960_XR_SFILTER_CFG_SFILTER_MAX_SHIFT) & 0xf) - 7);
+		}
+
+		ub960_rxport_get_strobe_pos(priv, nport, &strobe_pos);
+
+		dev_info(dev, "\tStrobe pos %d\n", strobe_pos);
+
+		/* EQ */
+
+		ub960_rxport_read(priv, nport, UB960_RR_AEQ_BYPASS, &v);
+
+		dev_info(dev, "\t%s EQ\n",
+			 (v & UB960_RR_AEQ_BYPASS_ENABLE) ? "Manual" :
+							    "Adaptive");
+
+		if (!(v & UB960_RR_AEQ_BYPASS_ENABLE)) {
+			ub960_rxport_read(priv, nport, UB960_RR_AEQ_MIN_MAX, &v);
+
+			dev_info(dev, "\tEQ range [%u, %u]\n",
+				 (v >> UB960_RR_AEQ_MIN_MAX_AEQ_FLOOR_SHIFT) & 0xf,
+				 (v >> UB960_RR_AEQ_MIN_MAX_AEQ_MAX_SHIFT) & 0xf);
+		}
+
+		if (ub960_rxport_get_eq_level(priv, nport, &eq_level) == 0)
+			dev_info(dev, "\tEQ level %u\n", eq_level);
+
+		/* GPIOs */
+		for (i = 0; i < UB960_NUM_BC_GPIOS; i++) {
+			u8 ctl_reg;
+			u8 ctl_shift;
+
+			ctl_reg = UB960_RR_BC_GPIO_CTL(i / 2);
+			ctl_shift = (i % 2) * 4;
+
+			ub960_rxport_read(priv, nport, ctl_reg, &v);
+
+			dev_info(dev, "\tGPIO%u: mode %u\n", i,
+				 (v >> ctl_shift) & 0xf);
+		}
+	}
+
+	v4l2_subdev_unlock_state(state);
+
+	return 0;
+}
+
+static const struct v4l2_subdev_core_ops ub960_subdev_core_ops = {
+	.log_status = ub960_log_status,
+	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
+	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
+};
+
+static const struct v4l2_subdev_ops ub960_subdev_ops = {
+	.core = &ub960_subdev_core_ops,
+	.pad = &ub960_pad_ops,
+};
+
+static const struct media_entity_operations ub960_entity_ops = {
+	.get_fwnode_pad = v4l2_subdev_get_fwnode_pad_1_to_1,
+	.link_validate = v4l2_subdev_link_validate,
+	.has_pad_interdep = v4l2_subdev_has_pad_interdep,
+};
+
+/* -----------------------------------------------------------------------------
+ * Core
+ */
+
+static irqreturn_t ub960_handle_events(int irq, void *arg)
+{
+	struct ub960_data *priv = arg;
+	unsigned int i;
+	u8 int_sts;
+	u8 fwd_sts;
+	int ret;
+
+	ret = ub960_read(priv, UB960_SR_INTERRUPT_STS, &int_sts);
+	if (ret || !int_sts)
+		return IRQ_NONE;
+
+	dev_dbg(&priv->client->dev, "INTERRUPT_STS %x\n", int_sts);
+
+	ret = ub960_read(priv, UB960_SR_FWD_STS, &fwd_sts);
+	if (ret)
+		return IRQ_NONE;
+
+	dev_dbg(&priv->client->dev, "FWD_STS %#02x\n", fwd_sts);
+
+	for (i = 0; i < priv->hw_data->num_txports; i++) {
+		if (int_sts & UB960_SR_INTERRUPT_STS_IS_CSI_TX(i))
+			ub960_csi_handle_events(priv, i);
+	}
+
+	for (i = 0; i < priv->hw_data->num_rxports; i++) {
+		if (!priv->rxports[i])
+			continue;
+
+		if (int_sts & UB960_SR_INTERRUPT_STS_IS_RX(i))
+			ub960_rxport_handle_events(priv, i);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void ub960_handler_work(struct work_struct *work)
+{
+	struct delayed_work *dwork = to_delayed_work(work);
+	struct ub960_data *priv =
+		container_of(dwork, struct ub960_data, poll_work);
+
+	ub960_handle_events(0, priv);
+
+	schedule_delayed_work(&priv->poll_work,
+			      msecs_to_jiffies(UB960_POLL_TIME_MS));
+}
+
+static void ub960_txport_free_ports(struct ub960_data *priv)
+{
+	unsigned int nport;
+
+	for (nport = 0; nport < priv->hw_data->num_txports; nport++) {
+		struct ub960_txport *txport = priv->txports[nport];
+
+		if (!txport)
+			continue;
+
+		kfree(txport);
+		priv->txports[nport] = NULL;
+	}
+}
+
+static void ub960_rxport_free_ports(struct ub960_data *priv)
+{
+	unsigned int nport;
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+
+		if (!rxport)
+			continue;
+
+		fwnode_handle_put(rxport->source.ep_fwnode);
+		fwnode_handle_put(rxport->ser.fwnode);
+
+		kfree(rxport);
+		priv->rxports[nport] = NULL;
+	}
+}
+
+static int ub960_parse_dt_base(struct ub960_data *priv)
+{
+	struct device *dev = &priv->client->dev;
+	size_t table_size;
+	unsigned int i;
+	u16 *aliases;
+	int ret;
+
+	ret = fwnode_property_count_u16(dev_fwnode(dev), "i2c-alias-pool");
+	if (ret < 0) {
+		dev_err(dev, "Failed to count 'i2c-alias-pool' property: %d\n",
+			ret);
+		return ret;
+	}
+
+	table_size = ret;
+	priv->atr.num_aliases = ret;
+
+	if (!table_size)
+		return 0;
+
+	priv->atr.aliases = devm_kcalloc(dev, table_size,
+					 sizeof(*priv->atr.aliases),
+					 GFP_KERNEL);
+	if (!priv->atr.aliases)
+		return -ENOMEM;
+
+	aliases = kcalloc(table_size, sizeof(u16), GFP_KERNEL);
+	if (!aliases)
+		return -ENOMEM;
+
+	ret = fwnode_property_read_u16_array(dev_fwnode(dev), "i2c-alias-pool",
+					     aliases, table_size);
+	if (ret < 0) {
+		dev_err(dev, "Failed to read 'i2c-alias-pool' property: %d\n",
+			ret);
+		kfree(aliases);
+		return ret;
+	}
+
+	for (i = 0; i < table_size; i++)
+		priv->atr.aliases[i].alias_id = aliases[i];
+
+	kfree(aliases);
+
+	dev_dbg(dev, "i2c-alias-pool has %zu aliases", table_size);
+
+	return 0;
+}
+
+static int
+ub960_parse_dt_rxport_link_properties(struct ub960_data *priv,
+				      struct fwnode_handle *link_fwnode,
+				      struct ub960_rxport *rxport)
+{
+	struct device *dev = &priv->client->dev;
+	unsigned int nport = rxport->nport;
+	u32 rx_mode;
+	u32 cdr_mode;
+	s32 strobe_pos;
+	u32 eq_level;
+	u32 ser_i2c_alias;
+	int ret;
+
+	cdr_mode = RXPORT_CDR_FPD3;
+
+	ret = fwnode_property_read_u32(link_fwnode, "ti,cdr-mode", &cdr_mode);
+	if (ret < 0 && ret != -EINVAL) {
+		dev_err(dev, "rx%u: failed to read '%s': %d\n", nport,
+			"ti,cdr-mode", ret);
+		return ret;
+	}
+
+	if (cdr_mode > RXPORT_CDR_LAST) {
+		dev_err(dev, "rx%u: bad 'ti,cdr-mode' %u\n", nport, cdr_mode);
+		return -EINVAL;
+	}
+
+	if (!priv->hw_data->is_fpdlink4 && cdr_mode == RXPORT_CDR_FPD4) {
+		dev_err(dev, "rx%u: FPD-Link 4 CDR not supported\n", nport);
+		return -EINVAL;
+	}
+
+	rxport->cdr_mode = cdr_mode;
+
+	ret = fwnode_property_read_u32(link_fwnode, "ti,rx-mode", &rx_mode);
+	if (ret < 0) {
+		dev_err(dev, "rx%u: failed to read '%s': %d\n", nport,
+			"ti,rx-mode", ret);
+		return ret;
+	}
+
+	if (rx_mode > RXPORT_MODE_LAST) {
+		dev_err(dev, "rx%u: bad 'ti,rx-mode' %u\n", nport, rx_mode);
+		return -EINVAL;
+	}
+
+	switch (rx_mode) {
+	case RXPORT_MODE_RAW12_HF:
+	case RXPORT_MODE_RAW12_LF:
+	case RXPORT_MODE_CSI2_ASYNC:
+		dev_err(dev, "rx%u: unsupported 'ti,rx-mode' %u\n", nport,
+			rx_mode);
+		return -EINVAL;
+	default:
+		break;
+	}
+
+	rxport->rx_mode = rx_mode;
+
+	/* EQ & Strobe related */
+
+	/* Defaults */
+	rxport->eq.manual_eq = false;
+	rxport->eq.aeq.eq_level_min = UB960_MIN_EQ_LEVEL;
+	rxport->eq.aeq.eq_level_max = UB960_MAX_EQ_LEVEL;
+
+	ret = fwnode_property_read_u32(link_fwnode, "ti,strobe-pos",
+				       &strobe_pos);
+	if (ret) {
+		if (ret != -EINVAL) {
+			dev_err(dev, "rx%u: failed to read '%s': %d\n", nport,
+				"ti,strobe-pos", ret);
+			return ret;
+		}
+	} else {
+		if (strobe_pos < UB960_MIN_MANUAL_STROBE_POS ||
+		    strobe_pos > UB960_MAX_MANUAL_STROBE_POS) {
+			dev_err(dev, "rx%u: illegal 'strobe-pos' value: %d\n",
+				nport, strobe_pos);
+			return -EINVAL;
+		}
+
+		/* NOTE: ignored unless global manual strobe pos is also set */
+		rxport->eq.strobe_pos = strobe_pos;
+		if (!priv->strobe.manual)
+			dev_warn(dev,
+				 "rx%u: 'ti,strobe-pos' ignored as 'ti,manual-strobe' not set\n",
+				 nport);
+	}
+
+	ret = fwnode_property_read_u32(link_fwnode, "ti,eq-level", &eq_level);
+	if (ret) {
+		if (ret != -EINVAL) {
+			dev_err(dev, "rx%u: failed to read '%s': %d\n", nport,
+				"ti,eq-level", ret);
+			return ret;
+		}
+	} else {
+		if (eq_level > UB960_MAX_EQ_LEVEL) {
+			dev_err(dev, "rx%u: illegal 'ti,eq-level' value: %d\n",
+				nport, eq_level);
+			return -EINVAL;
+		}
+
+		rxport->eq.manual_eq = true;
+		rxport->eq.manual.eq_level = eq_level;
+	}
+
+	ret = fwnode_property_read_u32(link_fwnode, "i2c-alias",
+				       &ser_i2c_alias);
+	if (ret) {
+		dev_err(dev, "rx%u: failed to read '%s': %d\n", nport,
+			"i2c-alias", ret);
+		return ret;
+	}
+	rxport->ser.alias = ser_i2c_alias;
+
+	rxport->ser.fwnode = fwnode_get_named_child_node(link_fwnode, "serializer");
+	if (!rxport->ser.fwnode) {
+		dev_err(dev, "rx%u: missing 'serializer' node\n", nport);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int ub960_parse_dt_rxport_ep_properties(struct ub960_data *priv,
+					       struct fwnode_handle *ep_fwnode,
+					       struct ub960_rxport *rxport)
+{
+	struct device *dev = &priv->client->dev;
+	struct v4l2_fwnode_endpoint vep = {};
+	unsigned int nport = rxport->nport;
+	bool hsync_hi;
+	bool vsync_hi;
+	int ret;
+
+	rxport->source.ep_fwnode = fwnode_graph_get_remote_endpoint(ep_fwnode);
+	if (!rxport->source.ep_fwnode) {
+		dev_err(dev, "rx%u: no remote endpoint\n", nport);
+		return -ENODEV;
+	}
+
+	/* We currently have properties only for RAW modes */
+
+	switch (rxport->rx_mode) {
+	case RXPORT_MODE_RAW10:
+	case RXPORT_MODE_RAW12_HF:
+	case RXPORT_MODE_RAW12_LF:
+		break;
+	default:
+		return 0;
+	}
+
+	vep.bus_type = V4L2_MBUS_PARALLEL;
+	ret = v4l2_fwnode_endpoint_parse(ep_fwnode, &vep);
+	if (ret) {
+		dev_err(dev, "rx%u: failed to parse endpoint data\n", nport);
+		goto err_put_source_ep_fwnode;
+	}
+
+	hsync_hi = !!(vep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH);
+	vsync_hi = !!(vep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH);
+
+	/* LineValid and FrameValid are inverse to the h/vsync active */
+	rxport->lv_fv_pol = (hsync_hi ? UB960_RR_PORT_CONFIG2_LV_POL_LOW : 0) |
+			    (vsync_hi ? UB960_RR_PORT_CONFIG2_FV_POL_LOW : 0);
+
+	return 0;
+
+err_put_source_ep_fwnode:
+	fwnode_handle_put(rxport->source.ep_fwnode);
+	return ret;
+}
+
+static int ub960_parse_dt_rxport(struct ub960_data *priv, unsigned int nport,
+				 struct fwnode_handle *link_fwnode,
+				 struct fwnode_handle *ep_fwnode)
+{
+	static const char *vpoc_names[UB960_MAX_RX_NPORTS] = {
+		"vpoc0", "vpoc1", "vpoc2", "vpoc3"
+	};
+	struct device *dev = &priv->client->dev;
+	struct ub960_rxport *rxport;
+	int ret;
+
+	rxport = kzalloc(sizeof(*rxport), GFP_KERNEL);
+	if (!rxport)
+		return -ENOMEM;
+
+	priv->rxports[nport] = rxport;
+
+	rxport->nport = nport;
+	rxport->priv = priv;
+
+	ret = ub960_parse_dt_rxport_link_properties(priv, link_fwnode, rxport);
+	if (ret)
+		goto err_free_rxport;
+
+	rxport->vpoc = devm_regulator_get_optional(dev, vpoc_names[nport]);
+	if (IS_ERR(rxport->vpoc)) {
+		ret = PTR_ERR(rxport->vpoc);
+		if (ret == -ENODEV) {
+			rxport->vpoc = NULL;
+		} else {
+			dev_err(dev, "rx%u: failed to get VPOC supply: %d\n",
+				nport, ret);
+			goto err_put_remote_fwnode;
+		}
+	}
+
+	ret = ub960_parse_dt_rxport_ep_properties(priv, ep_fwnode, rxport);
+	if (ret)
+		goto err_put_remote_fwnode;
+
+	return 0;
+
+err_put_remote_fwnode:
+	fwnode_handle_put(rxport->ser.fwnode);
+err_free_rxport:
+	priv->rxports[nport] = NULL;
+	kfree(rxport);
+	return ret;
+}
+
+static struct fwnode_handle *
+ub960_fwnode_get_link_by_regs(struct fwnode_handle *links_fwnode,
+			      unsigned int nport)
+{
+	struct fwnode_handle *link_fwnode;
+	int ret;
+
+	fwnode_for_each_child_node(links_fwnode, link_fwnode) {
+		u32 link_num;
+
+		if (!str_has_prefix(fwnode_get_name(link_fwnode), "link@"))
+			continue;
+
+		ret = fwnode_property_read_u32(link_fwnode, "reg", &link_num);
+		if (ret) {
+			fwnode_handle_put(link_fwnode);
+			return NULL;
+		}
+
+		if (nport == link_num)
+			return link_fwnode;
+	}
+
+	return NULL;
+}
+
+static int ub960_parse_dt_rxports(struct ub960_data *priv)
+{
+	struct device *dev = &priv->client->dev;
+	struct fwnode_handle *links_fwnode;
+	unsigned int nport;
+	int ret;
+
+	links_fwnode = fwnode_get_named_child_node(dev_fwnode(dev), "links");
+	if (!links_fwnode) {
+		dev_err(dev, "'links' node missing\n");
+		return -ENODEV;
+	}
+
+	/* Defaults, recommended by TI */
+	priv->strobe.min = 2;
+	priv->strobe.max = 3;
+
+	priv->strobe.manual = fwnode_property_read_bool(links_fwnode, "ti,manual-strobe");
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		struct fwnode_handle *link_fwnode;
+		struct fwnode_handle *ep_fwnode;
+
+		link_fwnode = ub960_fwnode_get_link_by_regs(links_fwnode, nport);
+		if (!link_fwnode)
+			continue;
+
+		ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
+							    nport, 0, 0);
+		if (!ep_fwnode) {
+			fwnode_handle_put(link_fwnode);
+			continue;
+		}
+
+		ret = ub960_parse_dt_rxport(priv, nport, link_fwnode,
+					    ep_fwnode);
+
+		fwnode_handle_put(link_fwnode);
+		fwnode_handle_put(ep_fwnode);
+
+		if (ret) {
+			dev_err(dev, "rx%u: failed to parse RX port\n", nport);
+			goto err_put_links;
+		}
+	}
+
+	fwnode_handle_put(links_fwnode);
+
+	return 0;
+
+err_put_links:
+	fwnode_handle_put(links_fwnode);
+
+	return ret;
+}
+
+static int ub960_parse_dt_txports(struct ub960_data *priv)
+{
+	struct device *dev = &priv->client->dev;
+	u32 nport;
+	int ret;
+
+	for (nport = 0; nport < priv->hw_data->num_txports; nport++) {
+		unsigned int port = nport + priv->hw_data->num_rxports;
+		struct fwnode_handle *ep_fwnode;
+
+		ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
+							    port, 0, 0);
+		if (!ep_fwnode)
+			continue;
+
+		ret = ub960_parse_dt_txport(priv, ep_fwnode, nport);
+
+		fwnode_handle_put(ep_fwnode);
+
+		if (ret)
+			break;
+	}
+
+	return 0;
+}
+
+static int ub960_parse_dt(struct ub960_data *priv)
+{
+	int ret;
+
+	ret = ub960_parse_dt_base(priv);
+	if (ret)
+		return ret;
+
+	ret = ub960_parse_dt_rxports(priv);
+	if (ret)
+		return ret;
+
+	ret = ub960_parse_dt_txports(priv);
+	if (ret)
+		goto err_free_rxports;
+
+	return 0;
+
+err_free_rxports:
+	ub960_rxport_free_ports(priv);
+
+	return ret;
+}
+
+static int ub960_notify_bound(struct v4l2_async_notifier *notifier,
+			      struct v4l2_subdev *subdev,
+			      struct v4l2_async_subdev *asd)
+{
+	struct ub960_data *priv = sd_to_ub960(notifier->sd);
+	struct ub960_rxport *rxport = to_ub960_asd(asd)->rxport;
+	struct device *dev = &priv->client->dev;
+	u8 nport = rxport->nport;
+	unsigned int i;
+	int ret;
+
+	ret = media_entity_get_fwnode_pad(&subdev->entity,
+					  rxport->source.ep_fwnode,
+					  MEDIA_PAD_FL_SOURCE);
+	if (ret < 0) {
+		dev_err(dev, "Failed to find pad for %s\n", subdev->name);
+		return ret;
+	}
+
+	rxport->source.sd = subdev;
+	rxport->source.pad = ret;
+
+	ret = media_create_pad_link(&rxport->source.sd->entity,
+				    rxport->source.pad, &priv->sd.entity, nport,
+				    MEDIA_LNK_FL_ENABLED |
+					    MEDIA_LNK_FL_IMMUTABLE);
+	if (ret) {
+		dev_err(dev, "Unable to link %s:%u -> %s:%u\n",
+			rxport->source.sd->name, rxport->source.pad,
+			priv->sd.name, nport);
+		return ret;
+	}
+
+	for (i = 0; i < priv->hw_data->num_rxports; i++) {
+		if (priv->rxports[i] && !priv->rxports[i]->source.sd) {
+			dev_dbg(dev, "Waiting for more subdevs to be bound\n");
+			return 0;
+		}
+	}
+
+	return 0;
+}
+
+static void ub960_notify_unbind(struct v4l2_async_notifier *notifier,
+				struct v4l2_subdev *subdev,
+				struct v4l2_async_subdev *asd)
+{
+	struct ub960_rxport *rxport = to_ub960_asd(asd)->rxport;
+
+	rxport->source.sd = NULL;
+}
+
+static const struct v4l2_async_notifier_operations ub960_notify_ops = {
+	.bound = ub960_notify_bound,
+	.unbind = ub960_notify_unbind,
+};
+
+static int ub960_v4l2_notifier_register(struct ub960_data *priv)
+{
+	struct device *dev = &priv->client->dev;
+	unsigned int i;
+	int ret;
+
+	v4l2_async_nf_init(&priv->notifier);
+
+	for (i = 0; i < priv->hw_data->num_rxports; i++) {
+		struct ub960_rxport *rxport = priv->rxports[i];
+		struct ub960_asd *asd;
+
+		if (!rxport)
+			continue;
+
+		asd = v4l2_async_nf_add_fwnode(&priv->notifier,
+					       rxport->source.ep_fwnode,
+					       struct ub960_asd);
+		if (IS_ERR(asd)) {
+			dev_err(dev, "Failed to add subdev for source %u: %pe",
+				i, asd);
+			v4l2_async_nf_cleanup(&priv->notifier);
+			return PTR_ERR(asd);
+		}
+
+		asd->rxport = rxport;
+	}
+
+	priv->notifier.ops = &ub960_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 ub960_v4l2_notifier_unregister(struct ub960_data *priv)
+{
+	v4l2_async_nf_unregister(&priv->notifier);
+	v4l2_async_nf_cleanup(&priv->notifier);
+}
+
+static int ub960_create_subdev(struct ub960_data *priv)
+{
+	struct device *dev = &priv->client->dev;
+	unsigned int i;
+	int ret;
+
+	v4l2_i2c_subdev_init(&priv->sd, priv->client, &ub960_subdev_ops);
+
+	v4l2_ctrl_handler_init(&priv->ctrl_handler, 1);
+	priv->sd.ctrl_handler = &priv->ctrl_handler;
+
+	v4l2_ctrl_new_int_menu(&priv->ctrl_handler, NULL, V4L2_CID_LINK_FREQ,
+			       ARRAY_SIZE(priv->tx_link_freq) - 1, 0,
+			       priv->tx_link_freq);
+
+	if (priv->ctrl_handler.error) {
+		ret = priv->ctrl_handler.error;
+		goto err_free_ctrl;
+	}
+
+	priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
+			  V4L2_SUBDEV_FL_HAS_EVENTS | V4L2_SUBDEV_FL_STREAMS;
+	priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+	priv->sd.entity.ops = &ub960_entity_ops;
+
+	for (i = 0; i < priv->hw_data->num_rxports + priv->hw_data->num_txports; i++) {
+		priv->pads[i].flags = ub960_pad_is_sink(priv, i) ?
+					      MEDIA_PAD_FL_SINK :
+					      MEDIA_PAD_FL_SOURCE;
+	}
+
+	ret = media_entity_pads_init(&priv->sd.entity,
+				     priv->hw_data->num_rxports +
+					     priv->hw_data->num_txports,
+				     priv->pads);
+	if (ret)
+		goto err_free_ctrl;
+
+	priv->sd.state_lock = priv->sd.ctrl_handler->lock;
+
+	ret = v4l2_subdev_init_finalize(&priv->sd);
+	if (ret)
+		goto err_entity_cleanup;
+
+	ret = ub960_v4l2_notifier_register(priv);
+	if (ret) {
+		dev_err(dev, "v4l2 subdev notifier register failed: %d\n", ret);
+		goto err_subdev_cleanup;
+	}
+
+	ret = v4l2_async_register_subdev(&priv->sd);
+	if (ret) {
+		dev_err(dev, "v4l2_async_register_subdev error: %d\n", ret);
+		goto err_unreg_notif;
+	}
+
+	return 0;
+
+err_unreg_notif:
+	ub960_v4l2_notifier_unregister(priv);
+err_subdev_cleanup:
+	v4l2_subdev_cleanup(&priv->sd);
+err_entity_cleanup:
+	media_entity_cleanup(&priv->sd.entity);
+err_free_ctrl:
+	v4l2_ctrl_handler_free(&priv->ctrl_handler);
+
+	return ret;
+}
+
+static void ub960_destroy_subdev(struct ub960_data *priv)
+{
+	ub960_v4l2_notifier_unregister(priv);
+	v4l2_async_unregister_subdev(&priv->sd);
+
+	v4l2_subdev_cleanup(&priv->sd);
+
+	media_entity_cleanup(&priv->sd.entity);
+	v4l2_ctrl_handler_free(&priv->ctrl_handler);
+}
+
+static const struct regmap_config ub960_regmap_config = {
+	.name = "ds90ub960",
+
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = 0xff,
+
+	/*
+	 * We do locking in the driver to cover the TX/RX port selection and the
+	 * indirect register access.
+	 */
+	.disable_locking = true,
+};
+
+static void ub960_reset(struct ub960_data *priv, bool reset_regs)
+{
+	struct device *dev = &priv->client->dev;
+	unsigned int v;
+	int ret;
+	u8 bit;
+
+	bit = reset_regs ? UB960_SR_RESET_DIGITAL_RESET1 :
+			   UB960_SR_RESET_DIGITAL_RESET0;
+
+	ub960_write(priv, UB960_SR_RESET, bit);
+
+	mutex_lock(&priv->reg_lock);
+
+	ret = regmap_read_poll_timeout(priv->regmap, UB960_SR_RESET, v,
+				       (v & bit) == 0, 2000, 100000);
+
+	mutex_unlock(&priv->reg_lock);
+
+	if (ret)
+		dev_err(dev, "reset failed: %d\n", ret);
+}
+
+static int ub960_get_hw_resources(struct ub960_data *priv)
+{
+	struct device *dev = &priv->client->dev;
+
+	priv->regmap = devm_regmap_init_i2c(priv->client, &ub960_regmap_config);
+	if (IS_ERR(priv->regmap))
+		return PTR_ERR(priv->regmap);
+
+	priv->vddio = devm_regulator_get(dev, "vddio");
+	if (IS_ERR(priv->vddio))
+		return dev_err_probe(dev, PTR_ERR(priv->vddio),
+				     "cannot get VDDIO regulator\n");
+
+	/* get power-down pin from DT */
+	priv->pd_gpio =
+		devm_gpiod_get_optional(dev, "powerdown", GPIOD_OUT_HIGH);
+	if (IS_ERR(priv->pd_gpio))
+		return dev_err_probe(dev, PTR_ERR(priv->pd_gpio),
+				     "Cannot get powerdown GPIO\n");
+
+	priv->refclk = devm_clk_get(dev, "refclk");
+	if (IS_ERR(priv->refclk))
+		return dev_err_probe(dev, PTR_ERR(priv->refclk),
+				     "Cannot get REFCLK\n");
+
+	return 0;
+}
+
+static int ub960_enable_core_hw(struct ub960_data *priv)
+{
+	struct device *dev = &priv->client->dev;
+	u8 rev_mask;
+	int ret;
+	u8 dev_sts;
+	u8 refclk_freq;
+
+	ret = regulator_enable(priv->vddio);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "failed to enable VDDIO regulator\n");
+
+	ret = clk_prepare_enable(priv->refclk);
+	if (ret) {
+		dev_err_probe(dev, ret, "Failed to enable refclk\n");
+		goto err_disable_vddio;
+	}
+
+	if (priv->pd_gpio) {
+		gpiod_set_value_cansleep(priv->pd_gpio, 1);
+		/* wait min 2 ms for reset to complete */
+		fsleep(2000);
+		gpiod_set_value_cansleep(priv->pd_gpio, 0);
+		/* wait min 2 ms for power up to finish */
+		fsleep(2000);
+	}
+
+	ub960_reset(priv, true);
+
+	/* Runtime check register accessibility */
+	ret = ub960_read(priv, UB960_SR_REV_MASK, &rev_mask);
+	if (ret) {
+		dev_err_probe(dev, ret, "Cannot read first register, abort\n");
+		goto err_pd_gpio;
+	}
+
+	dev_dbg(dev, "Found %s (rev/mask %#04x)\n", priv->hw_data->model,
+		rev_mask);
+
+	ret = ub960_read(priv, UB960_SR_DEVICE_STS, &dev_sts);
+	if (ret)
+		goto err_pd_gpio;
+
+	ret = ub960_read(priv, UB960_XR_REFCLK_FREQ, &refclk_freq);
+	if (ret)
+		goto err_pd_gpio;
+
+	dev_dbg(dev, "refclk valid %u freq %u MHz (clk fw freq %lu MHz)\n",
+		!!(dev_sts & BIT(4)), refclk_freq,
+		clk_get_rate(priv->refclk) / 1000000);
+
+	/* Disable all RX ports by default */
+	ret = ub960_write(priv, UB960_SR_RX_PORT_CTL, 0);
+	if (ret)
+		goto err_pd_gpio;
+
+	/* release GPIO lock */
+	if (priv->hw_data->is_ub9702) {
+		ret = ub960_update_bits(priv, UB960_SR_RESET,
+					UB960_SR_RESET_GPIO_LOCK_RELEASE,
+					UB960_SR_RESET_GPIO_LOCK_RELEASE);
+		if (ret)
+			goto err_pd_gpio;
+	}
+
+	return 0;
+
+err_pd_gpio:
+	gpiod_set_value_cansleep(priv->pd_gpio, 1);
+	clk_disable_unprepare(priv->refclk);
+err_disable_vddio:
+	regulator_disable(priv->vddio);
+
+	return ret;
+}
+
+static void ub960_disable_core_hw(struct ub960_data *priv)
+{
+	gpiod_set_value_cansleep(priv->pd_gpio, 1);
+	clk_disable_unprepare(priv->refclk);
+	regulator_disable(priv->vddio);
+}
+
+static int ub960_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct ub960_data *priv;
+	unsigned int port_lock_mask;
+	unsigned int port_mask;
+	unsigned int nport;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->client = client;
+
+	priv->hw_data = device_get_match_data(dev);
+
+	mutex_init(&priv->reg_lock);
+	mutex_init(&priv->atr.lock);
+
+	INIT_DELAYED_WORK(&priv->poll_work, ub960_handler_work);
+
+	/*
+	 * Initialize these to invalid values so that the first reg writes will
+	 * configure the target.
+	 */
+	priv->reg_current.indirect_target = 0xff;
+	priv->reg_current.rxport = 0xff;
+	priv->reg_current.txport = 0xff;
+
+	ret = ub960_get_hw_resources(priv);
+	if (ret)
+		goto err_mutex_destroy;
+
+	ret = ub960_enable_core_hw(priv);
+	if (ret)
+		goto err_mutex_destroy;
+
+	ret = ub960_parse_dt(priv);
+	if (ret)
+		goto err_disable_core_hw;
+
+	ret = ub960_init_tx_ports(priv);
+	if (ret)
+		goto err_free_ports;
+
+	ret = ub960_rxport_enable_vpocs(priv);
+	if (ret)
+		goto err_free_ports;
+
+	ret = ub960_init_rx_ports(priv);
+	if (ret)
+		goto err_disable_vpocs;
+
+	ub960_reset(priv, false);
+
+	port_mask = 0;
+
+	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		struct ub960_rxport *rxport = priv->rxports[nport];
+
+		if (!rxport)
+			continue;
+
+		port_mask |= BIT(nport);
+	}
+
+	ret = ub960_rxport_wait_locks(priv, port_mask, &port_lock_mask);
+	if (ret)
+		goto err_disable_vpocs;
+
+	if (port_mask != port_lock_mask) {
+		ret = -EIO;
+		dev_err_probe(dev, ret, "Failed to lock all RX ports\n");
+		goto err_disable_vpocs;
+	}
+
+	/*
+	 * Clear any errors caused by switching the RX port settings while
+	 * probing.
+	 */
+	ub960_clear_rx_errors(priv);
+
+	ret = ub960_init_atr(priv);
+	if (ret)
+		goto err_disable_vpocs;
+
+	ret = ub960_rxport_add_serializers(priv);
+	if (ret)
+		goto err_uninit_atr;
+
+	ret = ub960_create_subdev(priv);
+	if (ret)
+		goto err_free_sers;
+
+	if (client->irq)
+		dev_warn(dev, "irq support not implemented, using polling\n");
+
+	schedule_delayed_work(&priv->poll_work,
+			      msecs_to_jiffies(UB960_POLL_TIME_MS));
+
+	return 0;
+
+err_free_sers:
+	ub960_rxport_remove_serializers(priv);
+err_uninit_atr:
+	ub960_uninit_atr(priv);
+err_disable_vpocs:
+	ub960_rxport_disable_vpocs(priv);
+err_free_ports:
+	ub960_rxport_free_ports(priv);
+	ub960_txport_free_ports(priv);
+err_disable_core_hw:
+	ub960_disable_core_hw(priv);
+err_mutex_destroy:
+	mutex_destroy(&priv->atr.lock);
+	mutex_destroy(&priv->reg_lock);
+	return ret;
+}
+
+static void ub960_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ub960_data *priv = sd_to_ub960(sd);
+
+	cancel_delayed_work_sync(&priv->poll_work);
+
+	ub960_destroy_subdev(priv);
+	ub960_rxport_remove_serializers(priv);
+	ub960_uninit_atr(priv);
+	ub960_rxport_disable_vpocs(priv);
+	ub960_rxport_free_ports(priv);
+	ub960_txport_free_ports(priv);
+	ub960_disable_core_hw(priv);
+	mutex_destroy(&priv->atr.lock);
+	mutex_destroy(&priv->reg_lock);
+}
+
+static const struct ub960_hw_data ds90ub960_hw = {
+	.model = "ub960",
+	.num_rxports = 4,
+	.num_txports = 2,
+};
+
+static const struct ub960_hw_data ds90ub9702_hw = {
+	.model = "ub9702",
+	.num_rxports = 4,
+	.num_txports = 2,
+	.is_ub9702 = true,
+	.is_fpdlink4 = true,
+};
+
+static const struct i2c_device_id ub960_id[] = {
+	{ "ds90ub960-q1", (kernel_ulong_t)&ds90ub960_hw },
+	{ "ds90ub9702-q1", (kernel_ulong_t)&ds90ub9702_hw },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, ub960_id);
+
+static const struct of_device_id ub960_dt_ids[] = {
+	{ .compatible = "ti,ds90ub960-q1", .data = &ds90ub960_hw },
+	{ .compatible = "ti,ds90ub9702-q1", .data = &ds90ub9702_hw },
+	{}
+};
+MODULE_DEVICE_TABLE(of, ub960_dt_ids);
+
+static struct i2c_driver ds90ub960_driver = {
+	.probe_new	= ub960_probe,
+	.remove		= ub960_remove,
+	.id_table	= ub960_id,
+	.driver = {
+		.name	= "ds90ub960",
+		.of_match_table = ub960_dt_ids,
+	},
+};
+module_i2c_driver(ds90ub960_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Texas Instruments FPD-Link III/IV Deserializers Driver");
+MODULE_AUTHOR("Luca Ceresoli <luca@lucaceresoli.net>");
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>");
+MODULE_IMPORT_NS(I2C_ATR);
diff --git a/include/media/i2c/ds90ub9xx.h b/include/media/i2c/ds90ub9xx.h
new file mode 100644
index 000000000000..0245198469ec
--- /dev/null
+++ b/include/media/i2c/ds90ub9xx.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __MEDIA_I2C_DS90UB9XX_H__
+#define __MEDIA_I2C_DS90UB9XX_H__
+
+#include <linux/types.h>
+
+struct i2c_atr;
+
+/**
+ * struct ds90ub9xx_platform_data - platform data for FPD-Link Serializers.
+ * @port: Deserializer RX port for this Serializer
+ * @atr: I2C ATR
+ * @bc_rate: back-channel clock rate
+ */
+struct ds90ub9xx_platform_data {
+	u32 port;
+	struct i2c_atr *atr;
+	unsigned long bc_rate;
+};
+
+#endif /* __MEDIA_I2C_DS90UB9XX_H__ */
-- 
2.34.1