[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: Sakari Ailus <sakari.ailus@linux.intel.com> Tested-by: Hans Verkuil <hans.verkuil@cisco.com> Tested-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Sakari Ailus
Mauro Carvalho Chehab
Родитель
614d651e1a
Коммит
ca50c197bd
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@ -55,6 +55,9 @@ config V4L2_FLASH_LED_CLASS
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When in doubt, say N.
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config V4L2_FWNODE
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tristate
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# Used by drivers that need Videobuf modules
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config VIDEOBUF_GEN
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tristate
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@ -13,6 +13,7 @@ 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_V4L2_FWNODE) += v4l2-fwnode.o
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ifeq ($(CONFIG_TRACEPOINTS),y)
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videodev-objs += vb2-trace.o v4l2-trace.o
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endif
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@ -0,0 +1,345 @@
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/*
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* V4L2 fwnode binding parsing library
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*
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* The origins of the V4L2 fwnode library are in V4L2 OF library that
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* formerly was located in v4l2-of.c.
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*
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* Copyright (c) 2016 Intel Corporation.
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* Author: Sakari Ailus <sakari.ailus@linux.intel.com>
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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/acpi.h>
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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/property.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <media/v4l2-fwnode.h>
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static int v4l2_fwnode_endpoint_parse_csi_bus(struct fwnode_handle *fwnode,
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struct v4l2_fwnode_endpoint *vep)
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{
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struct v4l2_fwnode_bus_mipi_csi2 *bus = &vep->bus.mipi_csi2;
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bool have_clk_lane = false;
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unsigned int flags = 0, lanes_used = 0;
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unsigned int i;
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u32 v;
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int rval;
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rval = fwnode_property_read_u32_array(fwnode, "data-lanes", NULL, 0);
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if (rval > 0) {
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u32 array[ARRAY_SIZE(bus->data_lanes)];
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bus->num_data_lanes =
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min_t(int, ARRAY_SIZE(bus->data_lanes), rval);
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fwnode_property_read_u32_array(fwnode, "data-lanes", array,
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bus->num_data_lanes);
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for (i = 0; i < bus->num_data_lanes; i++) {
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if (lanes_used & BIT(array[i]))
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pr_warn("duplicated lane %u in data-lanes\n",
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array[i]);
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lanes_used |= BIT(array[i]);
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bus->data_lanes[i] = array[i];
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}
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}
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rval = fwnode_property_read_u32_array(fwnode, "lane-polarities", NULL,
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0);
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if (rval > 0) {
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u32 array[ARRAY_SIZE(bus->lane_polarities)];
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if (rval < 1 + bus->num_data_lanes /* clock + data */) {
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pr_warn("too few lane-polarities entries (need %u, got %u)\n",
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1 + bus->num_data_lanes, rval);
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return -EINVAL;
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}
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fwnode_property_read_u32_array(fwnode, "lane-polarities", array,
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1 + bus->num_data_lanes);
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for (i = 0; i < 1 + bus->num_data_lanes; i++)
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bus->lane_polarities[i] = array[i];
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}
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if (!fwnode_property_read_u32(fwnode, "clock-lanes", &v)) {
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if (lanes_used & BIT(v))
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pr_warn("duplicated lane %u in clock-lanes\n", v);
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lanes_used |= BIT(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 (fwnode_property_present(fwnode, "clock-noncontinuous"))
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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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vep->bus_type = V4L2_MBUS_CSI2;
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return 0;
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}
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static void v4l2_fwnode_endpoint_parse_parallel_bus(
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struct fwnode_handle *fwnode, struct v4l2_fwnode_endpoint *vep)
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{
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struct v4l2_fwnode_bus_parallel *bus = &vep->bus.parallel;
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unsigned int flags = 0;
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u32 v;
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if (!fwnode_property_read_u32(fwnode, "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 (!fwnode_property_read_u32(fwnode, "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 (!fwnode_property_read_u32(fwnode, "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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vep->bus_type = V4L2_MBUS_PARALLEL;
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else
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vep->bus_type = V4L2_MBUS_BT656;
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if (!fwnode_property_read_u32(fwnode, "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 (!fwnode_property_read_u32(fwnode, "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 (fwnode_property_present(fwnode, "slave-mode"))
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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 (!fwnode_property_read_u32(fwnode, "bus-width", &v))
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bus->bus_width = v;
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if (!fwnode_property_read_u32(fwnode, "data-shift", &v))
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bus->data_shift = v;
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if (!fwnode_property_read_u32(fwnode, "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_fwnode_endpoint_parse() - parse all fwnode node properties
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* @fwnode: pointer to the endpoint's fwnode handle
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* @vep: pointer to the V4L2 fwnode data structure
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*
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* All properties are optional. If none are found, we don't set any flags. This
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* means the port has a static configuration and no properties have to be
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* specified explicitly. If any properties that identify the bus as parallel
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* are found and slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if
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* we recognise the bus as serial CSI-2 and clock-noncontinuous isn't set, we
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* set the V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag. The caller should hold a
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* reference to @fwnode.
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*
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* NOTE: This function does not parse properties the size of which is variable
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* without a low fixed limit. Please use v4l2_fwnode_endpoint_alloc_parse() in
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* new drivers instead.
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode,
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struct v4l2_fwnode_endpoint *vep)
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{
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int rval;
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fwnode_graph_parse_endpoint(fwnode, &vep->base);
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/* Zero fields from bus_type to until the end */
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memset(&vep->bus_type, 0, sizeof(*vep) -
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offsetof(typeof(*vep), bus_type));
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rval = v4l2_fwnode_endpoint_parse_csi_bus(fwnode, vep);
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if (rval)
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return rval;
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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 (vep->bus.mipi_csi2.flags == 0)
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v4l2_fwnode_endpoint_parse_parallel_bus(fwnode, vep);
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return 0;
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}
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EXPORT_SYMBOL_GPL(v4l2_fwnode_endpoint_parse);
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/*
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* v4l2_fwnode_endpoint_free() - free the V4L2 fwnode acquired by
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* v4l2_fwnode_endpoint_alloc_parse()
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* @vep - the V4L2 fwnode the resources of which are to be released
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*
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* It is safe to call this function with NULL argument or on a V4L2 fwnode the
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* parsing of which failed.
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*/
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void v4l2_fwnode_endpoint_free(struct v4l2_fwnode_endpoint *vep)
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{
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if (IS_ERR_OR_NULL(vep))
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return;
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kfree(vep->link_frequencies);
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kfree(vep);
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}
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EXPORT_SYMBOL_GPL(v4l2_fwnode_endpoint_free);
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/**
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* v4l2_fwnode_endpoint_alloc_parse() - parse all fwnode node properties
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* @fwnode: pointer to the endpoint's fwnode handle
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*
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* All properties are optional. If none are found, we don't set any flags. This
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* means the port has a static configuration and no properties have to be
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* specified explicitly. If any properties that identify the bus as parallel
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* are found and slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if
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* we recognise the bus as serial CSI-2 and clock-noncontinuous isn't set, we
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* set the V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag. The caller should hold a
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* reference to @fwnode.
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*
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* v4l2_fwnode_endpoint_alloc_parse() has two important differences to
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* v4l2_fwnode_endpoint_parse():
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*
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* 1. It also parses variable size data.
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*
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* 2. The memory it has allocated to store the variable size data must be freed
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* using v4l2_fwnode_endpoint_free() when no longer needed.
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*
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* Return: Pointer to v4l2_fwnode_endpoint if successful, on an error pointer
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* on error.
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*/
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struct v4l2_fwnode_endpoint *v4l2_fwnode_endpoint_alloc_parse(
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struct fwnode_handle *fwnode)
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{
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struct v4l2_fwnode_endpoint *vep;
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int rval;
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vep = kzalloc(sizeof(*vep), GFP_KERNEL);
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if (!vep)
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return ERR_PTR(-ENOMEM);
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rval = v4l2_fwnode_endpoint_parse(fwnode, vep);
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if (rval < 0)
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goto out_err;
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rval = fwnode_property_read_u64_array(fwnode, "link-frequencies",
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NULL, 0);
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if (rval < 0)
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goto out_err;
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vep->link_frequencies =
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kmalloc_array(rval, sizeof(*vep->link_frequencies), GFP_KERNEL);
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if (!vep->link_frequencies) {
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rval = -ENOMEM;
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goto out_err;
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}
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vep->nr_of_link_frequencies = rval;
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rval = fwnode_property_read_u64_array(fwnode, "link-frequencies",
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vep->link_frequencies,
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vep->nr_of_link_frequencies);
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if (rval < 0)
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goto out_err;
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return vep;
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out_err:
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v4l2_fwnode_endpoint_free(vep);
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return ERR_PTR(rval);
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}
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EXPORT_SYMBOL_GPL(v4l2_fwnode_endpoint_alloc_parse);
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/**
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* v4l2_fwnode_endpoint_parse_link() - parse a link between two endpoints
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* @__fwnode: pointer to the endpoint's fwnode at the local end of the link
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* @link: pointer to the V4L2 fwnode link data structure
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*
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* Fill the link structure with the local and remote nodes and port numbers.
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* The local_node and remote_node fields are set to point to the local and
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* remote port's parent nodes respectively (the port parent node being the
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* parent node of the port node if that node isn't a 'ports' node, or the
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* grand-parent node of the port node otherwise).
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*
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* A reference is taken to both the local and remote nodes, the caller must use
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* v4l2_fwnode_endpoint_put_link() to drop the references when done with the
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* link.
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*
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* Return: 0 on success, or -ENOLINK if the remote endpoint fwnode can't be
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* found.
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*/
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int v4l2_fwnode_parse_link(struct fwnode_handle *__fwnode,
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struct v4l2_fwnode_link *link)
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{
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const char *port_prop = is_of_node(__fwnode) ? "reg" : "port";
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struct fwnode_handle *fwnode;
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memset(link, 0, sizeof(*link));
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fwnode = fwnode_get_parent(__fwnode);
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fwnode_property_read_u32(fwnode, port_prop, &link->local_port);
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fwnode = fwnode_get_next_parent(fwnode);
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if (is_of_node(fwnode) &&
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of_node_cmp(to_of_node(fwnode)->name, "ports") == 0)
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fwnode = fwnode_get_next_parent(fwnode);
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link->local_node = fwnode;
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fwnode = fwnode_graph_get_remote_endpoint(__fwnode);
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if (!fwnode) {
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fwnode_handle_put(fwnode);
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return -ENOLINK;
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}
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fwnode = fwnode_get_parent(fwnode);
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fwnode_property_read_u32(fwnode, port_prop, &link->remote_port);
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fwnode = fwnode_get_next_parent(fwnode);
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if (is_of_node(fwnode) &&
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of_node_cmp(to_of_node(fwnode)->name, "ports") == 0)
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fwnode = fwnode_get_next_parent(fwnode);
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link->remote_node = fwnode;
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return 0;
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}
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EXPORT_SYMBOL_GPL(v4l2_fwnode_parse_link);
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/**
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* v4l2_fwnode_put_link() - drop references to nodes in a link
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* @link: pointer to the V4L2 fwnode link data structure
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*
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* Drop references to the local and remote nodes in the link. This function
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* must be called on every link parsed with v4l2_fwnode_parse_link().
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*/
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void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link)
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{
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fwnode_handle_put(link->local_node);
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fwnode_handle_put(link->remote_node);
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}
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EXPORT_SYMBOL_GPL(v4l2_fwnode_put_link);
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MODULE_LICENSE("GPL");
|
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MODULE_AUTHOR("Sakari Ailus <sakari.ailus@linux.intel.com>");
|
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MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
|
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MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
|
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|
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@ -0,0 +1,104 @@
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/*
|
||||
* 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.
|
||||
*/
|
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#ifndef _V4L2_FWNODE_H
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#define _V4L2_FWNODE_H
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#include <linux/errno.h>
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#include <linux/fwnode.h>
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#include <linux/list.h>
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||||
#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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