From: Philipp Zabel <philipp.za...@gmail.com> This patch moves the parsing helpers used to parse connected graphs in the device tree, like the video interface bindings documented in Documentation/devicetree/bindings/media/video-interfaces.txt, from drivers/media/v4l2-core to drivers/of.
This allows to reuse the same parser code from outside the V4L2 framework, most importantly from display drivers. There have been patches that duplicate the code (and I am going to send one of my own), such as http://lists.freedesktop.org/archives/dri-devel/2013-August/043308.html and others that parse the same binding in a different way: https://www.mail-archive.com/linux-omap@vger.kernel.org/msg100761.html I think that all common video interface parsing helpers should be moved to a single place, outside of the specific subsystems, so that it can be reused by all drivers. I moved v4l2_of_get_next_endpoint, v4l2_of_get_remote_port, and v4l2_of_get_remote_port_parent. They are renamed to of_graph_get_next_endpoint, of_graph_get_remote_port, and of_graph_get_remote_port_parent, respectively. Signed-off-by: Philipp Zabel <p.za...@pengutronix.de> --- drivers/media/Kconfig | 1 + drivers/media/v4l2-core/v4l2-of.c | 117 --------------------------------- drivers/of/Kconfig | 3 + drivers/of/Makefile | 1 + drivers/of/of_graph.c | 133 ++++++++++++++++++++++++++++++++++++++ include/linux/of_graph.h | 23 +++++++ include/media/v4l2-of.h | 16 ++--- 7 files changed, 167 insertions(+), 127 deletions(-) create mode 100644 drivers/of/of_graph.c create mode 100644 include/linux/of_graph.h diff --git a/drivers/media/Kconfig b/drivers/media/Kconfig index 1d0758a..882faeb 100644 --- a/drivers/media/Kconfig +++ b/drivers/media/Kconfig @@ -96,6 +96,7 @@ config VIDEO_DEV tristate depends on MEDIA_SUPPORT depends on MEDIA_CAMERA_SUPPORT || MEDIA_ANALOG_TV_SUPPORT || MEDIA_RADIO_SUPPORT + select OF_GRAPH if OF default y config VIDEO_V4L2_SUBDEV_API diff --git a/drivers/media/v4l2-core/v4l2-of.c b/drivers/media/v4l2-core/v4l2-of.c index 42e3e8a..f919db3 100644 --- a/drivers/media/v4l2-core/v4l2-of.c +++ b/drivers/media/v4l2-core/v4l2-of.c @@ -152,120 +152,3 @@ int v4l2_of_parse_endpoint(const struct device_node *node, return 0; } EXPORT_SYMBOL(v4l2_of_parse_endpoint); - -/** - * v4l2_of_get_next_endpoint() - get next endpoint node - * @parent: pointer to the parent device node - * @prev: previous endpoint node, or NULL to get first - * - * Return: An 'endpoint' node pointer with refcount incremented. Refcount - * of the passed @prev node is not decremented, the caller have to use - * of_node_put() on it when done. - */ -struct device_node *v4l2_of_get_next_endpoint(const struct device_node *parent, - struct device_node *prev) -{ - struct device_node *endpoint; - struct device_node *port = NULL; - - if (!parent) - return NULL; - - if (!prev) { - struct device_node *node; - /* - * It's the first call, we have to find a port subnode - * within this node or within an optional 'ports' node. - */ - node = of_get_child_by_name(parent, "ports"); - if (node) - parent = node; - - port = of_get_child_by_name(parent, "port"); - - if (port) { - /* Found a port, get an endpoint. */ - endpoint = of_get_next_child(port, NULL); - of_node_put(port); - } else { - endpoint = NULL; - } - - if (!endpoint) - pr_err("%s(): no endpoint nodes specified for %s\n", - __func__, parent->full_name); - of_node_put(node); - } else { - port = of_get_parent(prev); - if (!port) - /* Hm, has someone given us the root node ?... */ - return NULL; - - /* Avoid dropping prev node refcount to 0. */ - of_node_get(prev); - endpoint = of_get_next_child(port, prev); - if (endpoint) { - of_node_put(port); - return endpoint; - } - - /* No more endpoints under this port, try the next one. */ - do { - port = of_get_next_child(parent, port); - if (!port) - return NULL; - } while (of_node_cmp(port->name, "port")); - - /* Pick up the first endpoint in this port. */ - endpoint = of_get_next_child(port, NULL); - of_node_put(port); - } - - return endpoint; -} -EXPORT_SYMBOL(v4l2_of_get_next_endpoint); - -/** - * v4l2_of_get_remote_port_parent() - get remote port's parent node - * @node: pointer to a local endpoint device_node - * - * Return: Remote device node associated with remote endpoint node linked - * to @node. Use of_node_put() on it when done. - */ -struct device_node *v4l2_of_get_remote_port_parent( - const struct device_node *node) -{ - struct device_node *np; - unsigned int depth; - - /* Get remote endpoint node. */ - np = of_parse_phandle(node, "remote-endpoint", 0); - - /* Walk 3 levels up only if there is 'ports' node. */ - for (depth = 3; depth && np; depth--) { - np = of_get_next_parent(np); - if (depth == 2 && of_node_cmp(np->name, "ports")) - break; - } - return np; -} -EXPORT_SYMBOL(v4l2_of_get_remote_port_parent); - -/** - * v4l2_of_get_remote_port() - get remote port node - * @node: pointer to a local endpoint device_node - * - * Return: Remote port node associated with remote endpoint node linked - * to @node. Use of_node_put() on it when done. - */ -struct device_node *v4l2_of_get_remote_port(const struct device_node *node) -{ - struct device_node *np; - - /* Get remote endpoint node. */ - np = of_parse_phandle(node, "remote-endpoint", 0); - if (!np) - return NULL; - return of_get_next_parent(np); -} -EXPORT_SYMBOL(v4l2_of_get_remote_port); diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index c6973f1..1bfbb0e 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -75,4 +75,7 @@ config OF_MTD depends on MTD def_bool y +config OF_GRAPH + bool + endmenu # OF diff --git a/drivers/of/Makefile b/drivers/of/Makefile index efd0510..7ee8ab3 100644 --- a/drivers/of/Makefile +++ b/drivers/of/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_OF_MDIO) += of_mdio.o obj-$(CONFIG_OF_PCI) += of_pci.o obj-$(CONFIG_OF_PCI_IRQ) += of_pci_irq.o obj-$(CONFIG_OF_MTD) += of_mtd.o +obj-$(CONFIG_OF_GRAPH) += of_graph.o diff --git a/drivers/of/of_graph.c b/drivers/of/of_graph.c new file mode 100644 index 0000000..aa526d7 --- /dev/null +++ b/drivers/of/of_graph.c @@ -0,0 +1,133 @@ +/* + * OF graph binding parsing library + * + * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. + * Author: Sylwester Nawrocki <s.nawro...@samsung.com> + * + * Copyright (C) 2012 Renesas Electronics Corp. + * Author: Guennadi Liakhovetski <g.liakhovet...@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/of.h> +#include <linux/types.h> + +/** + * of_graph_get_next_endpoint() - get next endpoint node + * @parent: pointer to the parent device node + * @prev: previous endpoint node, or NULL to get first + * + * Return: An 'endpoint' node pointer with refcount incremented. Refcount + * of the passed @prev node is not decremented, the caller have to use + * of_node_put() on it when done. + */ +struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, + struct device_node *prev) +{ + struct device_node *endpoint; + struct device_node *port = NULL; + + if (!parent) + return NULL; + + if (!prev) { + struct device_node *node; + /* + * It's the first call, we have to find a port subnode + * within this node or within an optional 'ports' node. + */ + node = of_get_child_by_name(parent, "ports"); + if (node) + parent = node; + + port = of_get_child_by_name(parent, "port"); + + if (port) { + /* Found a port, get an endpoint. */ + endpoint = of_get_next_child(port, NULL); + of_node_put(port); + } else { + endpoint = NULL; + } + + if (!endpoint) + pr_err("%s(): no endpoint nodes specified for %s\n", + __func__, parent->full_name); + of_node_put(node); + } else { + port = of_get_parent(prev); + if (!port) + /* Hm, has someone given us the root node ?... */ + return NULL; + + /* Avoid dropping prev node refcount to 0. */ + of_node_get(prev); + endpoint = of_get_next_child(port, prev); + if (endpoint) { + of_node_put(port); + return endpoint; + } + + /* No more endpoints under this port, try the next one. */ + do { + port = of_get_next_child(parent, port); + if (!port) + return NULL; + } while (of_node_cmp(port->name, "port")); + + /* Pick up the first endpoint in this port. */ + endpoint = of_get_next_child(port, NULL); + of_node_put(port); + } + + return endpoint; +} +EXPORT_SYMBOL(of_graph_get_next_endpoint); + +/** + * of_graph_get_remote_port_parent() - get remote port's parent node + * @node: pointer to a local endpoint device_node + * + * Return: Remote device node associated with remote endpoint node linked + * to @node. Use of_node_put() on it when done. + */ +struct device_node *of_graph_get_remote_port_parent( + const struct device_node *node) +{ + struct device_node *np; + unsigned int depth; + + /* Get remote endpoint node. */ + np = of_parse_phandle(node, "remote-endpoint", 0); + + /* Walk 3 levels up only if there is 'ports' node. */ + for (depth = 3; depth && np; depth--) { + np = of_get_next_parent(np); + if (depth == 2 && of_node_cmp(np->name, "ports")) + break; + } + return np; +} +EXPORT_SYMBOL(of_graph_get_remote_port_parent); + +/** + * of_graph_get_remote_port() - get remote port node + * @node: pointer to a local endpoint device_node + * + * Return: Remote port node associated with remote endpoint node linked + * to @node. Use of_node_put() on it when done. + */ +struct device_node *of_graph_get_remote_port(const struct device_node *node) +{ + struct device_node *np; + + /* Get remote endpoint node. */ + np = of_parse_phandle(node, "remote-endpoint", 0); + if (!np) + return NULL; + return of_get_next_parent(np); +} +EXPORT_SYMBOL(of_graph_get_remote_port); diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h new file mode 100644 index 0000000..352306a --- /dev/null +++ b/include/linux/of_graph.h @@ -0,0 +1,23 @@ +/* + * OF graph binding parsing helpers + * + * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. + * Author: Sylwester Nawrocki <s.nawro...@samsung.com> + * + * Copyright (C) 2012 Renesas Electronics Corp. + * Author: Guennadi Liakhovetski <g.liakhovet...@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. + */ +#ifndef __LINUX_OF_GRAPH_H +#define __LINUX_OF_GRAPH_H + +struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, + struct device_node *previous); +struct device_node *of_graph_get_remote_port_parent( + const struct device_node *node); +struct device_node *of_graph_get_remote_port(const struct device_node *node); + +#endif /* __LINUX_OF_GRAPH_H */ diff --git a/include/media/v4l2-of.h b/include/media/v4l2-of.h index 541cea4..404a493 100644 --- a/include/media/v4l2-of.h +++ b/include/media/v4l2-of.h @@ -17,6 +17,7 @@ #include <linux/list.h> #include <linux/types.h> #include <linux/errno.h> +#include <linux/of_graph.h> #include <media/v4l2-mediabus.h> @@ -72,11 +73,6 @@ struct v4l2_of_endpoint { #ifdef CONFIG_OF int v4l2_of_parse_endpoint(const struct device_node *node, struct v4l2_of_endpoint *endpoint); -struct device_node *v4l2_of_get_next_endpoint(const struct device_node *parent, - struct device_node *previous); -struct device_node *v4l2_of_get_remote_port_parent( - const struct device_node *node); -struct device_node *v4l2_of_get_remote_port(const struct device_node *node); #else /* CONFIG_OF */ static inline int v4l2_of_parse_endpoint(const struct device_node *node, @@ -85,25 +81,25 @@ static inline int v4l2_of_parse_endpoint(const struct device_node *node, return -ENOSYS; } +#endif /* CONFIG_OF */ + static inline struct device_node *v4l2_of_get_next_endpoint( const struct device_node *parent, struct device_node *previous) { - return NULL; + return of_graph_get_next_endpoint(parent, previous); } static inline struct device_node *v4l2_of_get_remote_port_parent( const struct device_node *node) { - return NULL; + return of_graph_get_remote_port_parent(node); } static inline struct device_node *v4l2_of_get_remote_port( const struct device_node *node) { - return NULL; + return of_graph_get_remote_port(node); } -#endif /* CONFIG_OF */ - #endif /* _V4L2_OF_H */ -- 1.8.5.3 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
