platform/ti-vpe/cal-camerarx.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * TI Camera Access Layer (CAL) - CAMERARX
 *
 * Copyright (c) 2015-2020 Texas Instruments Inc.
 *
 * Authors:
 *	Benoit Parrot <bparrot@ti.com>
 *	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#include <media/v4l2-ctrls.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>

#include "cal.h"
#include "cal_regs.h"

/* ------------------------------------------------------------------
 *	I/O Register Accessors
 * ------------------------------------------------------------------
 */

static inline u32 camerarx_read(struct cal_camerarx *phy, u32 offset)
{
	return ioread32(phy->base + offset);
}

static inline void camerarx_write(struct cal_camerarx *phy, u32 offset, u32 val)
{
	iowrite32(val, phy->base + offset);
}

/* ------------------------------------------------------------------
 *	CAMERARX Management
 * ------------------------------------------------------------------
 */

static s64 cal_camerarx_get_external_rate(struct cal_camerarx *phy)
{
	struct v4l2_ctrl *ctrl;
	s64 rate;

	ctrl = v4l2_ctrl_find(phy->sensor->ctrl_handler, V4L2_CID_PIXEL_RATE);
	if (!ctrl) {
		phy_err(phy, "no pixel rate control in subdev: %s\n",
			phy->sensor->name);
		return -EPIPE;
	}

	rate = v4l2_ctrl_g_ctrl_int64(ctrl);
	phy_dbg(3, phy, "sensor Pixel Rate: %llu\n", rate);

	return rate;
}

static void cal_camerarx_lane_config(struct cal_camerarx *phy)
{
	u32 val = cal_read(phy->cal, CAL_CSI2_COMPLEXIO_CFG(phy->instance));
	u32 lane_mask = CAL_CSI2_COMPLEXIO_CFG_CLOCK_POSITION_MASK;
	u32 polarity_mask = CAL_CSI2_COMPLEXIO_CFG_CLOCK_POL_MASK;
	struct v4l2_fwnode_bus_mipi_csi2 *mipi_csi2 =
		&phy->endpoint.bus.mipi_csi2;
	int lane;

	cal_set_field(&val, mipi_csi2->clock_lane + 1, lane_mask);
	cal_set_field(&val, mipi_csi2->lane_polarities[0], polarity_mask);
	for (lane = 0; lane < mipi_csi2->num_data_lanes; lane++) {
		/*
		 * Every lane are one nibble apart starting with the
		 * clock followed by the data lanes so shift masks by 4.
		 */
		lane_mask <<= 4;
		polarity_mask <<= 4;
		cal_set_field(&val, mipi_csi2->data_lanes[lane] + 1, lane_mask);
		cal_set_field(&val, mipi_csi2->lane_polarities[lane + 1],
			      polarity_mask);
	}

	cal_write(phy->cal, CAL_CSI2_COMPLEXIO_CFG(phy->instance), val);
	phy_dbg(3, phy, "CAL_CSI2_COMPLEXIO_CFG(%d) = 0x%08x\n",
		phy->instance, val);
}

static void cal_camerarx_enable(struct cal_camerarx *phy)
{
	u32 num_lanes = phy->cal->data->camerarx[phy->instance].num_lanes;

	regmap_field_write(phy->fields[F_CAMMODE], 0);
	/* Always enable all lanes at the phy control level */
	regmap_field_write(phy->fields[F_LANEENABLE], (1 << num_lanes) - 1);
	/* F_CSI_MODE is not present on every architecture */
	if (phy->fields[F_CSI_MODE])
		regmap_field_write(phy->fields[F_CSI_MODE], 1);
	regmap_field_write(phy->fields[F_CTRLCLKEN], 1);
}

void cal_camerarx_disable(struct cal_camerarx *phy)
{
	regmap_field_write(phy->fields[F_CTRLCLKEN], 0);
}

/*
 * TCLK values are OK at their reset values
 */
#define TCLK_TERM	0
#define TCLK_MISS	1
#define TCLK_SETTLE	14

static void cal_camerarx_config(struct cal_camerarx *phy, s64 external_rate,
				const struct cal_fmt *fmt)
{
	unsigned int reg0, reg1;
	unsigned int ths_term, ths_settle;
	unsigned int csi2_ddrclk_khz;
	struct v4l2_fwnode_bus_mipi_csi2 *mipi_csi2 =
			&phy->endpoint.bus.mipi_csi2;
	u32 num_lanes = mipi_csi2->num_data_lanes;

	/* DPHY timing configuration */

	/*
	 * CSI-2 is DDR and we only count used lanes.
	 *
	 * csi2_ddrclk_khz = external_rate / 1000
	 *		   / (2 * num_lanes) * fmt->bpp;
	 */
	csi2_ddrclk_khz = div_s64(external_rate * fmt->bpp,
				  2 * num_lanes * 1000);

	phy_dbg(1, phy, "csi2_ddrclk_khz: %d\n", csi2_ddrclk_khz);

	/* THS_TERM: Programmed value = floor(20 ns/DDRClk period) */
	ths_term = 20 * csi2_ddrclk_khz / 1000000;
	phy_dbg(1, phy, "ths_term: %d (0x%02x)\n", ths_term, ths_term);

	/* THS_SETTLE: Programmed value = floor(105 ns/DDRClk period) + 4 */
	ths_settle = (105 * csi2_ddrclk_khz / 1000000) + 4;
	phy_dbg(1, phy, "ths_settle: %d (0x%02x)\n", ths_settle, ths_settle);

	reg0 = camerarx_read(phy, CAL_CSI2_PHY_REG0);
	cal_set_field(&reg0, CAL_CSI2_PHY_REG0_HSCLOCKCONFIG_DISABLE,
		      CAL_CSI2_PHY_REG0_HSCLOCKCONFIG_MASK);
	cal_set_field(&reg0, ths_term, CAL_CSI2_PHY_REG0_THS_TERM_MASK);
	cal_set_field(&reg0, ths_settle, CAL_CSI2_PHY_REG0_THS_SETTLE_MASK);

	phy_dbg(1, phy, "CSI2_%d_REG0 = 0x%08x\n", phy->instance, reg0);
	camerarx_write(phy, CAL_CSI2_PHY_REG0, reg0);

	reg1 = camerarx_read(phy, CAL_CSI2_PHY_REG1);
	cal_set_field(&reg1, TCLK_TERM, CAL_CSI2_PHY_REG1_TCLK_TERM_MASK);
	cal_set_field(&reg1, 0xb8, CAL_CSI2_PHY_REG1_DPHY_HS_SYNC_PATTERN_MASK);
	cal_set_field(&reg1, TCLK_MISS,
		      CAL_CSI2_PHY_REG1_CTRLCLK_DIV_FACTOR_MASK);
	cal_set_field(&reg1, TCLK_SETTLE, CAL_CSI2_PHY_REG1_TCLK_SETTLE_MASK);

	phy_dbg(1, phy, "CSI2_%d_REG1 = 0x%08x\n", phy->instance, reg1);
	camerarx_write(phy, CAL_CSI2_PHY_REG1, reg1);
}

static void cal_camerarx_power(struct cal_camerarx *phy, bool enable)
{
	u32 target_state;
	unsigned int i;

	target_state = enable ? CAL_CSI2_COMPLEXIO_CFG_PWR_CMD_STATE_ON :
		       CAL_CSI2_COMPLEXIO_CFG_PWR_CMD_STATE_OFF;

	cal_write_field(phy->cal, CAL_CSI2_COMPLEXIO_CFG(phy->instance),
			target_state, CAL_CSI2_COMPLEXIO_CFG_PWR_CMD_MASK);

	for (i = 0; i < 10; i++) {
		u32 current_state;

		current_state = cal_read_field(phy->cal,
					       CAL_CSI2_COMPLEXIO_CFG(phy->instance),
					       CAL_CSI2_COMPLEXIO_CFG_PWR_STATUS_MASK);

		if (current_state == target_state)
			break;

		usleep_range(1000, 1100);
	}

	if (i == 10)
		phy_err(phy, "Failed to power %s complexio\n",
			enable ? "up" : "down");
}

static void cal_camerarx_wait_reset(struct cal_camerarx *phy)
{
	unsigned long timeout;

	timeout = jiffies + msecs_to_jiffies(750);
	while (time_before(jiffies, timeout)) {
		if (cal_read_field(phy->cal,
				   CAL_CSI2_COMPLEXIO_CFG(phy->instance),
				   CAL_CSI2_COMPLEXIO_CFG_RESET_DONE_MASK) ==
		    CAL_CSI2_COMPLEXIO_CFG_RESET_DONE_RESETCOMPLETED)
			break;
		usleep_range(500, 5000);
	}

	if (cal_read_field(phy->cal, CAL_CSI2_COMPLEXIO_CFG(phy->instance),
			   CAL_CSI2_COMPLEXIO_CFG_RESET_DONE_MASK) !=
			   CAL_CSI2_COMPLEXIO_CFG_RESET_DONE_RESETCOMPLETED)
		phy_err(phy, "Timeout waiting for Complex IO reset done\n");
}

static void cal_camerarx_wait_stop_state(struct cal_camerarx *phy)
{
	unsigned long timeout;

	timeout = jiffies + msecs_to_jiffies(750);
	while (time_before(jiffies, timeout)) {
		if (cal_read_field(phy->cal,
				   CAL_CSI2_TIMING(phy->instance),
				   CAL_CSI2_TIMING_FORCE_RX_MODE_IO1_MASK) == 0)
			break;
		usleep_range(500, 5000);
	}

	if (cal_read_field(phy->cal, CAL_CSI2_TIMING(phy->instance),
			   CAL_CSI2_TIMING_FORCE_RX_MODE_IO1_MASK) != 0)
		phy_err(phy, "Timeout waiting for stop state\n");
}

int cal_camerarx_start(struct cal_camerarx *phy, const struct cal_fmt *fmt)
{
	s64 external_rate;
	u32 sscounter;
	u32 val;
	int ret;

	external_rate = cal_camerarx_get_external_rate(phy);
	if (external_rate < 0)
		return external_rate;

	ret = v4l2_subdev_call(phy->sensor, core, s_power, 1);
	if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV) {
		phy_err(phy, "power on failed in subdev\n");
		return ret;
	}

	/*
	 * CSI-2 PHY Link Initialization Sequence, according to the DRA74xP /
	 * DRA75xP / DRA76xP / DRA77xP TRM. The DRA71x / DRA72x and the AM65x /
	 * DRA80xM TRMs have a a slightly simplified sequence.
	 */

	/*
	 * 1. Configure all CSI-2 low level protocol registers to be ready to
	 *    receive signals/data from the CSI-2 PHY.
	 *
	 *    i.-v. Configure the lanes position and polarity.
	 */
	cal_camerarx_lane_config(phy);

	/*
	 *    vi.-vii. Configure D-PHY mode, enable the required lanes and
	 *             enable the CAMERARX clock.
	 */
	cal_camerarx_enable(phy);

	/*
	 * 2. CSI PHY and link initialization sequence.
	 *
	 *    a. Deassert the CSI-2 PHY reset. Do not wait for reset completion
	 *       at this point, as it requires the external sensor to send the
	 *       CSI-2 HS clock.
	 */
	cal_write_field(phy->cal, CAL_CSI2_COMPLEXIO_CFG(phy->instance),
			CAL_CSI2_COMPLEXIO_CFG_RESET_CTRL_OPERATIONAL,
			CAL_CSI2_COMPLEXIO_CFG_RESET_CTRL_MASK);
	phy_dbg(3, phy, "CAL_CSI2_COMPLEXIO_CFG(%d) = 0x%08x De-assert Complex IO Reset\n",
		phy->instance,
		cal_read(phy->cal, CAL_CSI2_COMPLEXIO_CFG(phy->instance)));

	/* Dummy read to allow SCP reset to complete. */
	camerarx_read(phy, CAL_CSI2_PHY_REG0);

	/* Program the PHY timing parameters. */
	cal_camerarx_config(phy, external_rate, fmt);

	/*
	 *    b. Assert the FORCERXMODE signal.
	 *
	 * The stop-state-counter is based on fclk cycles, and we always use
	 * the x16 and x4 settings, so stop-state-timeout =
	 * fclk-cycle * 16 * 4 * counter.
	 *
	 * Stop-state-timeout must be more than 100us as per CSI-2 spec, so we
	 * calculate a timeout that's 100us (rounding up).
	 */
	sscounter = DIV_ROUND_UP(clk_get_rate(phy->cal->fclk), 10000 *  16 * 4);

	val = cal_read(phy->cal, CAL_CSI2_TIMING(phy->instance));
	cal_set_field(&val, 1, CAL_CSI2_TIMING_STOP_STATE_X16_IO1_MASK);
	cal_set_field(&val, 1, CAL_CSI2_TIMING_STOP_STATE_X4_IO1_MASK);
	cal_set_field(&val, sscounter,
		      CAL_CSI2_TIMING_STOP_STATE_COUNTER_IO1_MASK);
	cal_write(phy->cal, CAL_CSI2_TIMING(phy->instance), val);
	phy_dbg(3, phy, "CAL_CSI2_TIMING(%d) = 0x%08x Stop States\n",
		phy->instance,
		cal_read(phy->cal, CAL_CSI2_TIMING(phy->instance)));

	/* Assert the FORCERXMODE signal. */
	cal_write_field(phy->cal, CAL_CSI2_TIMING(phy->instance),
			1, CAL_CSI2_TIMING_FORCE_RX_MODE_IO1_MASK);
	phy_dbg(3, phy, "CAL_CSI2_TIMING(%d) = 0x%08x Force RXMODE\n",
		phy->instance,
		cal_read(phy->cal, CAL_CSI2_TIMING(phy->instance)));

	/*
	 * c. Connect pull-down on CSI-2 PHY link (using pad control).
	 *
	 * This is not required on DRA71x, DRA72x, AM65x and DRA80xM. Not
	 * implemented.
	 */

	/*
	 * d. Power up the CSI-2 PHY.
	 * e. Check whether the state status reaches the ON state.
	 */
	cal_camerarx_power(phy, true);

	/*
	 * Start the sensor to enable the CSI-2 HS clock. We can now wait for
	 * CSI-2 PHY reset to complete.
	 */
	ret = v4l2_subdev_call(phy->sensor, video, s_stream, 1);
	if (ret) {
		v4l2_subdev_call(phy->sensor, core, s_power, 0);
		phy_err(phy, "stream on failed in subdev\n");
		return ret;
	}

	cal_camerarx_wait_reset(phy);

	/* f. Wait for STOPSTATE=1 for all enabled lane modules. */
	cal_camerarx_wait_stop_state(phy);

	phy_dbg(1, phy, "CSI2_%u_REG1 = 0x%08x (bits 31-28 should be set)\n",
		phy->instance, camerarx_read(phy, CAL_CSI2_PHY_REG1));

	/*
	 * g. Disable pull-down on CSI-2 PHY link (using pad control).
	 *
	 * This is not required on DRA71x, DRA72x, AM65x and DRA80xM. Not
	 * implemented.
	 */

	return 0;
}

void cal_camerarx_stop(struct cal_camerarx *phy)
{
	unsigned int i;
	int ret;

	cal_camerarx_power(phy, false);

	/* Assert Complex IO Reset */
	cal_write_field(phy->cal, CAL_CSI2_COMPLEXIO_CFG(phy->instance),
			CAL_CSI2_COMPLEXIO_CFG_RESET_CTRL,
			CAL_CSI2_COMPLEXIO_CFG_RESET_CTRL_MASK);

	/* Wait for power down completion */
	for (i = 0; i < 10; i++) {
		if (cal_read_field(phy->cal,
				   CAL_CSI2_COMPLEXIO_CFG(phy->instance),
				   CAL_CSI2_COMPLEXIO_CFG_RESET_DONE_MASK) ==
		    CAL_CSI2_COMPLEXIO_CFG_RESET_DONE_RESETONGOING)
			break;
		usleep_range(1000, 1100);
	}
	phy_dbg(3, phy, "CAL_CSI2_COMPLEXIO_CFG(%d) = 0x%08x Complex IO in Reset (%d) %s\n",
		phy->instance,
		cal_read(phy->cal, CAL_CSI2_COMPLEXIO_CFG(phy->instance)), i,
		(i >= 10) ? "(timeout)" : "");

	/* Disable the phy */
	cal_camerarx_disable(phy);

	if (v4l2_subdev_call(phy->sensor, video, s_stream, 0))
		phy_err(phy, "stream off failed in subdev\n");

	ret = v4l2_subdev_call(phy->sensor, core, s_power, 0);
	if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
		phy_err(phy, "power off failed in subdev\n");
}

/*
 *   Errata i913: CSI2 LDO Needs to be disabled when module is powered on
 *
 *   Enabling CSI2 LDO shorts it to core supply. It is crucial the 2 CSI2
 *   LDOs on the device are disabled if CSI-2 module is powered on
 *   (0x4845 B304 | 0x4845 B384 [28:27] = 0x1) or in ULPS (0x4845 B304
 *   | 0x4845 B384 [28:27] = 0x2) mode. Common concerns include: high
 *   current draw on the module supply in active mode.
 *
 *   Errata does not apply when CSI-2 module is powered off
 *   (0x4845 B304 | 0x4845 B384 [28:27] = 0x0).
 *
 * SW Workaround:
 *	Set the following register bits to disable the LDO,
 *	which is essentially CSI2 REG10 bit 6:
 *
 *		Core 0:  0x4845 B828 = 0x0000 0040
 *		Core 1:  0x4845 B928 = 0x0000 0040
 */
void cal_camerarx_i913_errata(struct cal_camerarx *phy)
{
	u32 reg10 = camerarx_read(phy, CAL_CSI2_PHY_REG10);

	cal_set_field(&reg10, 1, CAL_CSI2_PHY_REG10_I933_LDO_DISABLE_MASK);

	phy_dbg(1, phy, "CSI2_%d_REG10 = 0x%08x\n", phy->instance, reg10);
	camerarx_write(phy, CAL_CSI2_PHY_REG10, reg10);
}

/*
 * Enable the expected IRQ sources
 */
void cal_camerarx_enable_irqs(struct cal_camerarx *phy)
{
	u32 val;

	const u32 cio_err_mask =
		CAL_CSI2_COMPLEXIO_IRQ_LANE_ERRORS_MASK |
		CAL_CSI2_COMPLEXIO_IRQ_FIFO_OVR_MASK |
		CAL_CSI2_COMPLEXIO_IRQ_SHORT_PACKET_MASK |
		CAL_CSI2_COMPLEXIO_IRQ_ECC_NO_CORRECTION_MASK;

	/* Enable CIO error irqs */
	cal_write(phy->cal, CAL_HL_IRQENABLE_SET(0),
		  CAL_HL_IRQ_CIO_MASK(phy->instance));
	cal_write(phy->cal, CAL_CSI2_COMPLEXIO_IRQENABLE(phy->instance),
		  cio_err_mask);

	/* Always enable OCPO error */
	cal_write(phy->cal, CAL_HL_IRQENABLE_SET(0), CAL_HL_IRQ_OCPO_ERR_MASK);

	/* Enable IRQ_WDMA_END 0/1 */
	val = 0;
	cal_set_field(&val, 1, CAL_HL_IRQ_MASK(phy->instance));
	cal_write(phy->cal, CAL_HL_IRQENABLE_SET(1), val);
	/* Enable IRQ_WDMA_START 0/1 */
	val = 0;
	cal_set_field(&val, 1, CAL_HL_IRQ_MASK(phy->instance));
	cal_write(phy->cal, CAL_HL_IRQENABLE_SET(2), val);
	/* Todo: Add VC_IRQ and CSI2_COMPLEXIO_IRQ handling */
	cal_write(phy->cal, CAL_CSI2_VC_IRQENABLE(0), 0xFF000000);
}

void cal_camerarx_disable_irqs(struct cal_camerarx *phy)
{
	u32 val;

	/* Disable CIO error irqs */
	cal_write(phy->cal, CAL_HL_IRQENABLE_CLR(0),
		  CAL_HL_IRQ_CIO_MASK(phy->instance));
	cal_write(phy->cal, CAL_CSI2_COMPLEXIO_IRQENABLE(phy->instance), 0);

	/* Disable IRQ_WDMA_END 0/1 */
	val = 0;
	cal_set_field(&val, 1, CAL_HL_IRQ_MASK(phy->instance));
	cal_write(phy->cal, CAL_HL_IRQENABLE_CLR(1), val);
	/* Disable IRQ_WDMA_START 0/1 */
	val = 0;
	cal_set_field(&val, 1, CAL_HL_IRQ_MASK(phy->instance));
	cal_write(phy->cal, CAL_HL_IRQENABLE_CLR(2), val);
	/* Todo: Add VC_IRQ and CSI2_COMPLEXIO_IRQ handling */
	cal_write(phy->cal, CAL_CSI2_VC_IRQENABLE(0), 0);
}

void cal_camerarx_ppi_enable(struct cal_camerarx *phy)
{
	cal_write(phy->cal, CAL_CSI2_PPI_CTRL(phy->instance), BIT(3));
	cal_write_field(phy->cal, CAL_CSI2_PPI_CTRL(phy->instance),
			1, CAL_CSI2_PPI_CTRL_IF_EN_MASK);
}

void cal_camerarx_ppi_disable(struct cal_camerarx *phy)
{
	cal_write_field(phy->cal, CAL_CSI2_PPI_CTRL(phy->instance),
			0, CAL_CSI2_PPI_CTRL_IF_EN_MASK);
}

static int cal_camerarx_regmap_init(struct cal_dev *cal,
				    struct cal_camerarx *phy)
{
	const struct cal_camerarx_data *phy_data;
	unsigned int i;

	if (!cal->data)
		return -EINVAL;

	phy_data = &cal->data->camerarx[phy->instance];

	for (i = 0; i < F_MAX_FIELDS; i++) {
		struct reg_field field = {
			.reg = cal->syscon_camerrx_offset,
			.lsb = phy_data->fields[i].lsb,
			.msb = phy_data->fields[i].msb,
		};

		/*
		 * Here we update the reg offset with the
		 * value found in DT
		 */
		phy->fields[i] = devm_regmap_field_alloc(cal->dev,
							 cal->syscon_camerrx,
							 field);
		if (IS_ERR(phy->fields[i])) {
			cal_err(cal, "Unable to allocate regmap fields\n");
			return PTR_ERR(phy->fields[i]);
		}
	}

	return 0;
}

static int cal_camerarx_parse_dt(struct cal_camerarx *phy)
{
	struct v4l2_fwnode_endpoint *endpoint = &phy->endpoint;
	struct device_node *ep_node;
	char data_lanes[V4L2_FWNODE_CSI2_MAX_DATA_LANES * 2];
	unsigned int i;
	int ret;

	/*
	 * Find the endpoint node for the port corresponding to the PHY
	 * instance, and parse its CSI-2-related properties.
	 */
	ep_node = of_graph_get_endpoint_by_regs(phy->cal->dev->of_node,
						phy->instance, 0);
	if (!ep_node) {
		/*
		 * The endpoint is not mandatory, not all PHY instances need to
		 * be connected in DT.
		 */
		phy_dbg(3, phy, "Port has no endpoint\n");
		return 0;
	}

	endpoint->bus_type = V4L2_MBUS_CSI2_DPHY;
	ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep_node), endpoint);
	if (ret < 0) {
		phy_err(phy, "Failed to parse endpoint\n");
		goto done;
	}

	for (i = 0; i < endpoint->bus.mipi_csi2.num_data_lanes; i++) {
		unsigned int lane = endpoint->bus.mipi_csi2.data_lanes[i];

		if (lane > 4) {
			phy_err(phy, "Invalid position %u for data lane %u\n",
				lane, i);
			ret = -EINVAL;
			goto done;
		}

		data_lanes[i*2] = '0' + lane;
		data_lanes[i*2+1] = ' ';
	}

	data_lanes[i*2-1] = '\0';

	phy_dbg(3, phy,
		"CSI-2 bus: clock lane <%u>, data lanes <%s>, flags 0x%08x\n",
		endpoint->bus.mipi_csi2.clock_lane, data_lanes,
		endpoint->bus.mipi_csi2.flags);

	/* Retrieve the connected device and store it for later use. */
	phy->sensor_node = of_graph_get_remote_port_parent(ep_node);
	if (!phy->sensor_node) {
		phy_dbg(3, phy, "Can't get remote parent\n");
		ret = -EINVAL;
		goto done;
	}

	phy_dbg(1, phy, "Found connected device %pOFn\n", phy->sensor_node);

done:
	of_node_put(ep_node);
	return ret;
}

struct cal_camerarx *cal_camerarx_create(struct cal_dev *cal,
					 unsigned int instance)
{
	struct platform_device *pdev = to_platform_device(cal->dev);
	struct cal_camerarx *phy;
	int ret;

	phy = kzalloc(sizeof(*phy), GFP_KERNEL);
	if (!phy)
		return ERR_PTR(-ENOMEM);

	phy->cal = cal;
	phy->instance = instance;

	phy->res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
						(instance == 0) ?
						"cal_rx_core0" :
						"cal_rx_core1");
	phy->base = devm_ioremap_resource(cal->dev, phy->res);
	if (IS_ERR(phy->base)) {
		cal_err(cal, "failed to ioremap\n");
		ret = PTR_ERR(phy->base);
		goto error;
	}

	cal_dbg(1, cal, "ioresource %s at %pa - %pa\n",
		phy->res->name, &phy->res->start, &phy->res->end);

	ret = cal_camerarx_regmap_init(cal, phy);
	if (ret)
		goto error;

	ret = cal_camerarx_parse_dt(phy);
	if (ret)
		goto error;

	return phy;

error:
	kfree(phy);
	return ERR_PTR(ret);
}

void cal_camerarx_destroy(struct cal_camerarx *phy)
{
	if (!phy)
		return;

	of_node_put(phy->sensor_node);
	kfree(phy);
}