145 lines
4.1 KiB
C
145 lines
4.1 KiB
C
/*
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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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* Author: 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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if (!of_property_read_u32(node, "sync-on-green-active", &v))
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flags |= v ? V4L2_MBUS_VIDEO_SOG_ACTIVE_HIGH :
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V4L2_MBUS_VIDEO_SOG_ACTIVE_LOW;
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bus->flags = flags;
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}
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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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* Return: 0.
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*/
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int 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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of_graph_parse_endpoint(node, &endpoint->base);
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endpoint->bus_type = 0;
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memset(&endpoint->bus, 0, sizeof(endpoint->bus));
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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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return 0;
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}
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EXPORT_SYMBOL(v4l2_of_parse_endpoint);
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