diff options
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-of.c')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-of.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-of.c b/drivers/media/v4l2-core/v4l2-of.c new file mode 100644 index 00000000000..b4ed9a955fb --- /dev/null +++ b/drivers/media/v4l2-core/v4l2-of.c @@ -0,0 +1,144 @@ +/* + * 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); |