[media] Add a V4L2 OF parser
Add a V4L2 OF parser, implementing bindings documented in Documentation/devicetree/bindings/media/video-interfaces.txt. [s.nawrocki@samsung.com: various corrections and improvements since the initial version] Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Guennadi Liakhovetski
Mauro Carvalho Chehab
parent
53c5b6c95f
commit
99fd133f90
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@ -9,6 +9,9 @@ videodev-objs := v4l2-dev.o v4l2-ioctl.o v4l2-device.o v4l2-fh.o \
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ifeq ($(CONFIG_COMPAT),y)
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videodev-objs += v4l2-compat-ioctl32.o
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endif
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ifeq ($(CONFIG_OF),y)
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videodev-objs += v4l2-of.o
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endif
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obj-$(CONFIG_VIDEO_DEV) += videodev.o
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obj-$(CONFIG_VIDEO_V4L2_INT_DEVICE) += v4l2-int-device.o
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@ -0,0 +1,267 @@
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/*
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* V4L2 OF binding parsing library
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*
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* Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
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* Sylwester Nawrocki <s.nawrocki@samsung.com>
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*
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* Copyright (C) 2012 Renesas Electronics Corp.
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* Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <media/v4l2-of.h>
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static void v4l2_of_parse_csi_bus(const struct device_node *node,
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struct v4l2_of_endpoint *endpoint)
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{
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struct v4l2_of_bus_mipi_csi2 *bus = &endpoint->bus.mipi_csi2;
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u32 data_lanes[ARRAY_SIZE(bus->data_lanes)];
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struct property *prop;
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bool have_clk_lane = false;
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unsigned int flags = 0;
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u32 v;
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prop = of_find_property(node, "data-lanes", NULL);
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if (prop) {
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const __be32 *lane = NULL;
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int i;
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for (i = 0; i < ARRAY_SIZE(data_lanes); i++) {
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lane = of_prop_next_u32(prop, lane, &data_lanes[i]);
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if (!lane)
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break;
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}
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bus->num_data_lanes = i;
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while (i--)
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bus->data_lanes[i] = data_lanes[i];
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}
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if (!of_property_read_u32(node, "clock-lanes", &v)) {
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bus->clock_lane = v;
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have_clk_lane = true;
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}
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if (of_get_property(node, "clock-noncontinuous", &v))
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flags |= V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
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else if (have_clk_lane || bus->num_data_lanes > 0)
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flags |= V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
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bus->flags = flags;
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endpoint->bus_type = V4L2_MBUS_CSI2;
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}
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static void v4l2_of_parse_parallel_bus(const struct device_node *node,
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struct v4l2_of_endpoint *endpoint)
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{
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struct v4l2_of_bus_parallel *bus = &endpoint->bus.parallel;
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unsigned int flags = 0;
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u32 v;
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if (!of_property_read_u32(node, "hsync-active", &v))
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flags |= v ? V4L2_MBUS_HSYNC_ACTIVE_HIGH :
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V4L2_MBUS_HSYNC_ACTIVE_LOW;
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if (!of_property_read_u32(node, "vsync-active", &v))
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flags |= v ? V4L2_MBUS_VSYNC_ACTIVE_HIGH :
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V4L2_MBUS_VSYNC_ACTIVE_LOW;
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if (!of_property_read_u32(node, "pclk-sample", &v))
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flags |= v ? V4L2_MBUS_PCLK_SAMPLE_RISING :
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V4L2_MBUS_PCLK_SAMPLE_FALLING;
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if (!of_property_read_u32(node, "field-even-active", &v))
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flags |= v ? V4L2_MBUS_FIELD_EVEN_HIGH :
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V4L2_MBUS_FIELD_EVEN_LOW;
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if (flags)
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endpoint->bus_type = V4L2_MBUS_PARALLEL;
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else
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endpoint->bus_type = V4L2_MBUS_BT656;
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if (!of_property_read_u32(node, "data-active", &v))
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flags |= v ? V4L2_MBUS_DATA_ACTIVE_HIGH :
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V4L2_MBUS_DATA_ACTIVE_LOW;
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if (of_get_property(node, "slave-mode", &v))
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flags |= V4L2_MBUS_SLAVE;
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else
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flags |= V4L2_MBUS_MASTER;
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if (!of_property_read_u32(node, "bus-width", &v))
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bus->bus_width = v;
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if (!of_property_read_u32(node, "data-shift", &v))
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bus->data_shift = v;
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bus->flags = flags;
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}
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EXPORT_SYMBOL(v4l2_of_parse_parallel_bus);
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/**
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* v4l2_of_parse_endpoint() - parse all endpoint node properties
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* @node: pointer to endpoint device_node
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* @endpoint: pointer to the V4L2 OF endpoint data structure
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*
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* All properties are optional. If none are found, we don't set any flags.
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* This means the port has a static configuration and no properties have
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* to be specified explicitly.
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* If any properties that identify the bus as parallel are found and
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* slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if we recognise
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* the bus as serial CSI-2 and clock-noncontinuous isn't set, we set the
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* V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag.
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* The caller should hold a reference to @node.
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*/
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void v4l2_of_parse_endpoint(const struct device_node *node,
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struct v4l2_of_endpoint *endpoint)
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{
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struct device_node *port_node = of_get_parent(node);
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memset(endpoint, 0, offsetof(struct v4l2_of_endpoint, head));
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endpoint->local_node = node;
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/*
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* It doesn't matter whether the two calls below succeed.
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* If they don't then the default value 0 is used.
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*/
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of_property_read_u32(port_node, "reg", &endpoint->port);
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of_property_read_u32(node, "reg", &endpoint->id);
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v4l2_of_parse_csi_bus(node, endpoint);
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/*
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* Parse the parallel video bus properties only if none
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* of the MIPI CSI-2 specific properties were found.
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*/
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if (endpoint->bus.mipi_csi2.flags == 0)
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v4l2_of_parse_parallel_bus(node, endpoint);
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of_node_put(port_node);
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}
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EXPORT_SYMBOL(v4l2_of_parse_endpoint);
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/**
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* v4l2_of_get_next_endpoint() - get next endpoint node
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* @parent: pointer to the parent device node
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* @prev: previous endpoint node, or NULL to get first
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*
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* Return: An 'endpoint' node pointer with refcount incremented. Refcount
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* of the passed @prev node is not decremented, the caller have to use
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* of_node_put() on it when done.
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*/
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struct device_node *v4l2_of_get_next_endpoint(const struct device_node *parent,
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struct device_node *prev)
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{
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struct device_node *endpoint;
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struct device_node *port = NULL;
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if (!parent)
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return NULL;
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if (!prev) {
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struct device_node *node;
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/*
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* It's the first call, we have to find a port subnode
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* within this node or within an optional 'ports' node.
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*/
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node = of_get_child_by_name(parent, "ports");
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if (node)
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parent = node;
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for_each_child_of_node(parent, node) {
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if (!of_node_cmp(node->name, "port")) {
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port = node;
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break;
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}
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}
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if (port) {
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/* Found a port, get an endpoint. */
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endpoint = of_get_next_child(port, NULL);
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of_node_put(port);
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} else {
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endpoint = NULL;
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}
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if (!endpoint)
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pr_err("%s(): no endpoint nodes specified for %s\n",
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__func__, parent->full_name);
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} else {
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port = of_get_parent(prev);
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if (!port)
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/* Hm, has someone given us the root node ?... */
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return NULL;
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/* Avoid dropping prev node refcount to 0. */
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of_node_get(prev);
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endpoint = of_get_next_child(port, prev);
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if (endpoint) {
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of_node_put(port);
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return endpoint;
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}
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/* No more endpoints under this port, try the next one. */
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do {
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port = of_get_next_child(parent, port);
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if (!port)
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return NULL;
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} while (of_node_cmp(port->name, "port"));
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/* Pick up the first endpoint in this port. */
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endpoint = of_get_next_child(port, NULL);
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of_node_put(port);
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}
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return endpoint;
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}
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EXPORT_SYMBOL(v4l2_of_get_next_endpoint);
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/**
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* v4l2_of_get_remote_port_parent() - get remote port's parent node
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* @node: pointer to a local endpoint device_node
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*
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* Return: Remote device node associated with remote endpoint node linked
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* to @node. Use of_node_put() on it when done.
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*/
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struct device_node *v4l2_of_get_remote_port_parent(
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const struct device_node *node)
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{
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struct device_node *np;
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unsigned int depth;
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/* Get remote endpoint node. */
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np = of_parse_phandle(node, "remote-endpoint", 0);
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/* Walk 3 levels up only if there is 'ports' node. */
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for (depth = 3; depth && np; depth--) {
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np = of_get_next_parent(np);
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if (depth == 2 && of_node_cmp(np->name, "ports"))
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break;
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}
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return np;
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}
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EXPORT_SYMBOL(v4l2_of_get_remote_port_parent);
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/**
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* v4l2_of_get_remote_port() - get remote port node
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* @node: pointer to a local endpoint device_node
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*
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* Return: Remote port node associated with remote endpoint node linked
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* to @node. Use of_node_put() on it when done.
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*/
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struct device_node *v4l2_of_get_remote_port(const struct device_node *node)
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{
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struct device_node *np;
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/* Get remote endpoint node. */
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np = of_parse_phandle(node, "remote-endpoint", 0);
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if (!np)
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return NULL;
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return of_get_parent(np);
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}
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EXPORT_SYMBOL(v4l2_of_get_remote_port);
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@ -0,0 +1,111 @@
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/*
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* V4L2 OF binding parsing library
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*
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* Copyright (C) 2012 Renesas Electronics Corp.
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* Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*
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* Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
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* Sylwester Nawrocki <s.nawrocki@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*/
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#ifndef _V4L2_OF_H
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#define _V4L2_OF_H
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <media/v4l2-mediabus.h>
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struct device_node;
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/**
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* struct v4l2_of_bus_mipi_csi2 - MIPI CSI-2 bus data structure
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* @flags: media bus (V4L2_MBUS_*) flags
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* @data_lanes: an array of physical data lane indexes
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* @clock_lane: physical lane index of the clock lane
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* @num_data_lanes: number of data lanes
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*/
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struct v4l2_of_bus_mipi_csi2 {
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unsigned int flags;
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unsigned char data_lanes[4];
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unsigned char clock_lane;
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unsigned short num_data_lanes;
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};
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/**
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* struct v4l2_of_bus_parallel - parallel data bus data structure
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* @flags: media bus (V4L2_MBUS_*) flags
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* @bus_width: bus width in bits
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* @data_shift: data shift in bits
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*/
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struct v4l2_of_bus_parallel {
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unsigned int flags;
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unsigned char bus_width;
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unsigned char data_shift;
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};
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/**
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* struct v4l2_of_endpoint - the endpoint data structure
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* @port: identifier (value of reg property) of a port this endpoint belongs to
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* @id: identifier (value of reg property) of this endpoint
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* @local_node: pointer to device_node of this endpoint
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* @remote: phandle to remote endpoint node
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* @bus_type: bus type
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* @bus: bus configuration data structure
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* @head: list head for this structure
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*/
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struct v4l2_of_endpoint {
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unsigned int port;
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unsigned int id;
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const struct device_node *local_node;
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const __be32 *remote;
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enum v4l2_mbus_type bus_type;
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union {
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struct v4l2_of_bus_parallel parallel;
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struct v4l2_of_bus_mipi_csi2 mipi_csi2;
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} bus;
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struct list_head head;
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};
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#ifdef CONFIG_OF
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void v4l2_of_parse_endpoint(const struct device_node *node,
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struct v4l2_of_endpoint *link);
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struct device_node *v4l2_of_get_next_endpoint(const struct device_node *parent,
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struct device_node *previous);
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struct device_node *v4l2_of_get_remote_port_parent(
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const struct device_node *node);
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struct device_node *v4l2_of_get_remote_port(const struct device_node *node);
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#else /* CONFIG_OF */
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static inline int v4l2_of_parse_endpoint(const struct device_node *node,
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struct v4l2_of_endpoint *link)
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{
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return -ENOSYS;
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}
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static inline struct device_node *v4l2_of_get_next_endpoint(
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const struct device_node *parent,
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struct device_node *previous)
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{
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return NULL;
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}
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static inline struct device_node *v4l2_of_get_remote_port_parent(
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const struct device_node *node)
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{
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return NULL;
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}
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static inline struct device_node *v4l2_of_get_remote_port(
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const struct device_node *node)
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{
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return NULL;
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}
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#endif /* CONFIG_OF */
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#endif /* _V4L2_OF_H */
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