diff options
Diffstat (limited to 'drivers/video/omap2/dss')
| -rw-r--r-- | drivers/video/omap2/dss/Makefile | 2 | ||||
| -rw-r--r-- | drivers/video/omap2/dss/dss-of.c | 159 |
2 files changed, 160 insertions, 1 deletions
diff --git a/drivers/video/omap2/dss/Makefile b/drivers/video/omap2/dss/Makefile index d3aa91bdd6a..8aec8bda27c 100644 --- a/drivers/video/omap2/dss/Makefile +++ b/drivers/video/omap2/dss/Makefile @@ -1,7 +1,7 @@ obj-$(CONFIG_OMAP2_DSS) += omapdss.o # Core DSS files omapdss-y := core.o dss.o dss_features.o dispc.o dispc_coefs.o display.o \ - output.o + output.o dss-of.o # DSS compat layer files omapdss-y += manager.o manager-sysfs.o overlay.o overlay-sysfs.o apply.o \ dispc-compat.o display-sysfs.o diff --git a/drivers/video/omap2/dss/dss-of.c b/drivers/video/omap2/dss/dss-of.c new file mode 100644 index 00000000000..a4b20aaf614 --- /dev/null +++ b/drivers/video/omap2/dss/dss-of.c @@ -0,0 +1,159 @@ +/* + * Copyright (C) 2013 Texas Instruments + * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/seq_file.h> + +#include <video/omapdss.h> + +struct device_node * +omapdss_of_get_next_port(const struct device_node *parent, + struct device_node *prev) +{ + struct device_node *port = NULL; + + if (!parent) + return NULL; + + if (!prev) { + struct device_node *ports; + /* + * It's the first call, we have to find a port subnode + * within this node or within an optional 'ports' node. + */ + ports = of_get_child_by_name(parent, "ports"); + if (ports) + parent = ports; + + port = of_get_child_by_name(parent, "port"); + + /* release the 'ports' node */ + of_node_put(ports); + } else { + struct device_node *ports; + + ports = of_get_parent(prev); + if (!ports) + return NULL; + + do { + port = of_get_next_child(ports, prev); + if (!port) { + of_node_put(ports); + return NULL; + } + prev = port; + } while (of_node_cmp(port->name, "port") != 0); + } + + return port; +} +EXPORT_SYMBOL_GPL(omapdss_of_get_next_port); + +struct device_node * +omapdss_of_get_next_endpoint(const struct device_node *parent, + struct device_node *prev) +{ + struct device_node *ep = NULL; + + if (!parent) + return NULL; + + do { + ep = of_get_next_child(parent, prev); + if (!ep) + return NULL; + prev = ep; + } while (of_node_cmp(ep->name, "endpoint") != 0); + + return ep; +} +EXPORT_SYMBOL_GPL(omapdss_of_get_next_endpoint); + +static struct device_node * +omapdss_of_get_remote_device_node(const struct device_node *node) +{ + struct device_node *np; + int i; + + np = of_parse_phandle(node, "remote-endpoint", 0); + + if (!np) + return NULL; + + np = of_get_next_parent(np); + + for (i = 0; i < 3 && np; ++i) { + struct property *prop; + + prop = of_find_property(np, "compatible", NULL); + + if (prop) + return np; + + np = of_get_next_parent(np); + } + + return NULL; +} + +struct device_node * +omapdss_of_get_first_endpoint(const struct device_node *parent) +{ + struct device_node *port, *ep; + + port = omapdss_of_get_next_port(parent, NULL); + + if (!port) + return NULL; + + ep = omapdss_of_get_next_endpoint(port, NULL); + + of_node_put(port); + + return ep; +} +EXPORT_SYMBOL_GPL(omapdss_of_get_first_endpoint); + +struct omap_dss_device * +omapdss_of_find_source_for_first_ep(struct device_node *node) +{ + struct device_node *ep; + struct device_node *src_node; + struct omap_dss_device *src; + + ep = omapdss_of_get_first_endpoint(node); + if (!ep) + return ERR_PTR(-EINVAL); + + src_node = omapdss_of_get_remote_device_node(ep); + + of_node_put(ep); + + if (!src_node) + return ERR_PTR(-EINVAL); + + src = omap_dss_find_output_by_node(src_node); + + of_node_put(src_node); + + if (!src) + return ERR_PTR(-EPROBE_DEFER); + + return src; +} +EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep); |