path: root/drivers/media/v4l2-core/v4l2-fwnode.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * V4L2 fwnode binding parsing library
 *
 * The origins of the V4L2 fwnode library are in V4L2 OF library that
 * formerly was located in v4l2-of.c.
 *
 * Copyright (c) 2016 Intel Corporation.
 * Author: Sakari Ailus <sakari.ailus@linux.intel.com>
 *
 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
 *
 * Copyright (C) 2012 Renesas Electronics Corp.
 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 */
#include <linux/acpi.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/property.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/types.h>

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

enum v4l2_fwnode_bus_type {
	V4L2_FWNODE_BUS_TYPE_GUESS = 0,
	V4L2_FWNODE_BUS_TYPE_CSI2_CPHY,
	V4L2_FWNODE_BUS_TYPE_CSI1,
	V4L2_FWNODE_BUS_TYPE_CCP2,
	V4L2_FWNODE_BUS_TYPE_CSI2_DPHY,
	V4L2_FWNODE_BUS_TYPE_PARALLEL,
	V4L2_FWNODE_BUS_TYPE_BT656,
	NR_OF_V4L2_FWNODE_BUS_TYPE,
};

static const struct v4l2_fwnode_bus_conv {
	enum v4l2_fwnode_bus_type fwnode_bus_type;
	enum v4l2_mbus_type mbus_type;
	const char *name;
} buses[] = {
	{
		V4L2_FWNODE_BUS_TYPE_GUESS,
		V4L2_MBUS_UNKNOWN,
		"not specified",
	}, {
		V4L2_FWNODE_BUS_TYPE_CSI2_CPHY,
		V4L2_MBUS_CSI2_CPHY,
		"MIPI CSI-2 C-PHY",
	}, {
		V4L2_FWNODE_BUS_TYPE_CSI1,
		V4L2_MBUS_CSI1,
		"MIPI CSI-1",
	}, {
		V4L2_FWNODE_BUS_TYPE_CCP2,
		V4L2_MBUS_CCP2,
		"compact camera port 2",
	}, {
		V4L2_FWNODE_BUS_TYPE_CSI2_DPHY,
		V4L2_MBUS_CSI2_DPHY,
		"MIPI CSI-2 D-PHY",
	}, {
		V4L2_FWNODE_BUS_TYPE_PARALLEL,
		V4L2_MBUS_PARALLEL,
		"parallel",
	}, {
		V4L2_FWNODE_BUS_TYPE_BT656,
		V4L2_MBUS_BT656,
		"Bt.656",
	}
};

static const struct v4l2_fwnode_bus_conv *
get_v4l2_fwnode_bus_conv_by_fwnode_bus(enum v4l2_fwnode_bus_type type)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(buses); i++)
		if (buses[i].fwnode_bus_type == type)
			return &buses[i];

	return NULL;
}

static enum v4l2_mbus_type
v4l2_fwnode_bus_type_to_mbus(enum v4l2_fwnode_bus_type type)
{
	const struct v4l2_fwnode_bus_conv *conv =
		get_v4l2_fwnode_bus_conv_by_fwnode_bus(type);

	return conv ? conv->mbus_type : V4L2_MBUS_UNKNOWN;
}

static const char *
v4l2_fwnode_bus_type_to_string(enum v4l2_fwnode_bus_type type)
{
	const struct v4l2_fwnode_bus_conv *conv =
		get_v4l2_fwnode_bus_conv_by_fwnode_bus(type);

	return conv ? conv->name : "not found";
}

static const struct v4l2_fwnode_bus_conv *
get_v4l2_fwnode_bus_conv_by_mbus(enum v4l2_mbus_type type)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(buses); i++)
		if (buses[i].mbus_type == type)
			return &buses[i];

	return NULL;
}

static const char *
v4l2_fwnode_mbus_type_to_string(enum v4l2_mbus_type type)
{
	const struct v4l2_fwnode_bus_conv *conv =
		get_v4l2_fwnode_bus_conv_by_mbus(type);

	return conv ? conv->name : "not found";
}

static int v4l2_fwnode_endpoint_parse_csi2_bus(struct fwnode_handle *fwnode,
					       struct v4l2_fwnode_endpoint *vep,
					       enum v4l2_mbus_type bus_type)
{
	struct v4l2_fwnode_bus_mipi_csi2 *bus = &vep->bus.mipi_csi2;
	bool have_clk_lane = false, have_data_lanes = false,
		have_lane_polarities = false;
	unsigned int flags = 0, lanes_used = 0;
	u32 array[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES];
	u32 clock_lane = 0;
	unsigned int num_data_lanes = 0;</