Commit ca50c197 authored by Sakari Ailus's avatar Sakari Ailus Committed by Mauro Carvalho Chehab

[media] v4l: fwnode: Support generic fwnode for parsing standardised properties

The fwnode_handle is a more generic way than OF device_node to describe
firmware nodes. Instead of the OF API, use more generic fwnode API to
obtain the same information.

As the V4L2 fwnode support will be required by a small minority of e.g.
ACPI based systems (the same might actually go for OF), make this a module
instead of embedding it in the videodev module.

The origins of the V4L2 fwnode framework is in the V4L2 OF framework.
Signed-off-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Tested-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 614d651e
......@@ -55,6 +55,9 @@ config V4L2_FLASH_LED_CLASS
When in doubt, say N.
config V4L2_FWNODE
tristate
# Used by drivers that need Videobuf modules
config VIDEOBUF_GEN
tristate
......
......@@ -13,6 +13,7 @@ endif
ifeq ($(CONFIG_OF),y)
videodev-objs += v4l2-of.o
endif
obj-$(CONFIG_V4L2_FWNODE) += v4l2-fwnode.o
ifeq ($(CONFIG_TRACEPOINTS),y)
videodev-objs += vb2-trace.o v4l2-trace.o
endif
......
This diff is collapsed.
/*
* V4L2 fwnode binding parsing library
*
* 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>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*/
#ifndef _V4L2_FWNODE_H
#define _V4L2_FWNODE_H
#include <linux/errno.h>
#include <linux/fwnode.h>
#include <linux/list.h>
#include <linux/types.h>
#include <media/v4l2-mediabus.h>
struct fwnode_handle;
/**
* struct v4l2_fwnode_bus_mipi_csi2 - MIPI CSI-2 bus data structure
* @flags: media bus (V4L2_MBUS_*) flags
* @data_lanes: an array of physical data lane indexes
* @clock_lane: physical lane index of the clock lane
* @num_data_lanes: number of data lanes
* @lane_polarities: polarity of the lanes. The order is the same of
* the physical lanes.
*/
struct v4l2_fwnode_bus_mipi_csi2 {
unsigned int flags;
unsigned char data_lanes[4];
unsigned char clock_lane;
unsigned short num_data_lanes;
bool lane_polarities[5];
};
/**
* struct v4l2_fwnode_bus_parallel - parallel data bus data structure
* @flags: media bus (V4L2_MBUS_*) flags
* @bus_width: bus width in bits
* @data_shift: data shift in bits
*/
struct v4l2_fwnode_bus_parallel {
unsigned int flags;
unsigned char bus_width;
unsigned char data_shift;
};
/**
* struct v4l2_fwnode_endpoint - the endpoint data structure
* @base: fwnode endpoint of the v4l2_fwnode
* @bus_type: bus type
* @bus: bus configuration data structure
* @link_frequencies: array of supported link frequencies
* @nr_of_link_frequencies: number of elements in link_frequenccies array
*/
struct v4l2_fwnode_endpoint {
struct fwnode_endpoint base;
/*
* Fields below this line will be zeroed by
* v4l2_fwnode_parse_endpoint()
*/
enum v4l2_mbus_type bus_type;
union {
struct v4l2_fwnode_bus_parallel parallel;
struct v4l2_fwnode_bus_mipi_csi2 mipi_csi2;
} bus;
u64 *link_frequencies;
unsigned int nr_of_link_frequencies;
};
/**
* struct v4l2_fwnode_link - a link between two endpoints
* @local_node: pointer to device_node of this endpoint
* @local_port: identifier of the port this endpoint belongs to
* @remote_node: pointer to device_node of the remote endpoint
* @remote_port: identifier of the port the remote endpoint belongs to
*/
struct v4l2_fwnode_link {
struct fwnode_handle *local_node;
unsigned int local_port;
struct fwnode_handle *remote_node;
unsigned int remote_port;
};
int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode,
struct v4l2_fwnode_endpoint *vep);
struct v4l2_fwnode_endpoint *v4l2_fwnode_endpoint_alloc_parse(
struct fwnode_handle *fwnode);
void v4l2_fwnode_endpoint_free(struct v4l2_fwnode_endpoint *vep);
int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode,
struct v4l2_fwnode_link *link);
void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link);
#endif /* _V4L2_FWNODE_H */
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