/* * V4L2 OF binding parsing library * * 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. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/string.h> #include <linux/types.h> #include <media/v4l2-of.h> static void v4l2_of_parse_csi_bus(const struct device_node *node, struct v4l2_of_endpoint *endpoint) { struct v4l2_of_bus_mipi_csi2 *bus = &endpoint->bus.mipi_csi2; u32 data_lanes[ARRAY_SIZE(bus->data_lanes)]; struct property *prop; bool have_clk_lane = false; unsigned int flags = 0; u32 v; prop = of_find_property(node, "data-lanes", NULL); if (prop) { const __be32 *lane = NULL; int i; for (i = 0; i < ARRAY_SIZE(data_lanes); i++) { lane = of_prop_next_u32(prop, lane, &data_lanes[i]); if (!lane) break; } bus->num_data_lanes = i; while (i--) bus->data_lanes[i] = data_lanes[i]; } if (!of_property_read_u32(node, "clock-lanes", &v)) { bus->clock_lane = v; have_clk_lane = true; } if (of_get_property(node, "clock-noncontinuous", &v)) flags |= V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK; else if (have_clk_lane || bus->num_data_lanes > 0) flags |= V4L2_MBUS_CSI2_CONTINUOUS_CLOCK; bus->flags = flags; endpoint->bus_type = V4L2_MBUS_CSI2; } static void v4l2_of_parse_parallel_bus(const struct device_node *node, struct v4l2_of_endpoint *endpoint) { struct v4l2_of_bus_parallel *bus = &endpoint->bus.parallel; unsigned int flags = 0; u32 v; if (!of_property_read_u32(node, "hsync-active", &v)) flags |= v ? V4L2_MBUS_HSYNC_ACTIVE_HIGH : V4L2_MBUS_HSYNC_ACTIVE_LOW; if (!of_property_read_u32(node, "vsync-active", &v)) flags |= v ? V4L2_MBUS_VSYNC_ACTIVE_HIGH : V4L2_MBUS_VSYNC_ACTIVE_LOW; if (!of_property_read_u32(node, "pclk-sample", &v)) flags |= v ? V4L2_MBUS_PCLK_SAMPLE_RISING : V4L2_MBUS_PCLK_SAMPLE_FALLING; if (!of_property_read_u32(node, "field-even-active", &v)) flags |= v ? V4L2_MBUS_FIELD_EVEN_HIGH : V4L2_MBUS_FIELD_EVEN_LOW; if (flags) endpoint->bus_type = V4L2_MBUS_PARALLEL; else endpoint->bus_type = V4L2_MBUS_BT656; if (!of_property_read_u32(node, "data-active", &v)) flags |= v ? V4L2_MBUS_DATA_ACTIVE_HIGH : V4L2_MBUS_DATA_ACTIVE_LOW; if (of_get_property(node, "slave-mode", &v)) flags |= V4L2_MBUS_SLAVE; else flags |= V4L2_MBUS_MASTER; if (!of_property_read_u32(node, "bus-width", &v)) bus->bus_width = v; if (!of_property_read_u32(node, "data-shift", &v)) bus->data_shift = v; if (!of_property_read_u32(node, "sync-on-green-active", &v)) flags |= v ? V4L2_MBUS_VIDEO_SOG_ACTIVE_HIGH : V4L2_MBUS_VIDEO_SOG_ACTIVE_LOW; bus->flags = flags; } /** * v4l2_of_parse_endpoint() - parse all endpoint node properties * @node: pointer to endpoint device_node * @endpoint: pointer to the V4L2 OF endpoint data structure * * All properties are optional. If none are found, we don't set any flags. * This means the port has a static configuration and no properties have * to be specified explicitly. * If any properties that identify the bus as parallel are found and * slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if we recognise * the bus as serial CSI-2 and clock-noncontinuous isn't set, we set the * V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag. * The caller should hold a reference to @node. * * Return: 0. */ int v4l2_of_parse_endpoint(const struct device_node *node, struct v4l2_of_endpoint *endpoint) { of_graph_parse_endpoint(node, &endpoint->base); endpoint->bus_type = 0; memset(&endpoint->bus, 0, sizeof(endpoint->bus)); v4l2_of_parse_csi_bus(node, endpoint); /* * Parse the parallel video bus properties only if none * of the MIPI CSI-2 specific properties were found. */ if (endpoint->bus.mipi_csi2.flags == 0) v4l2_of_parse_parallel_bus(node, endpoint); return 0; } EXPORT_SYMBOL(v4l2_of_parse_endpoint);