[RFC PATCH v2 1/4] staging: imx-drm: Add temporary copies of v4l2-of parsing functions (original) (raw)

Philipp Zabel p.zabel at pengutronix.de
Tue Feb 11 03:45:41 PST 2014

From: Philipp Zabel <philipp.zabel at gmail.com>

The video interface bindings described in Documentation/device-tree/bindings/media/video-interfaces.txt are useful for DRM drivers, too. To decouple development, duplicate the v4l2-of parser functions temporarily. Also modify imx_drm_of_get_next_endpoint to decrement the refcount of prev.

Signed-off-by: Philipp Zabel <philipp.zabel at gmail.com>

drivers/staging/imx-drm/Makefile | 2 +- drivers/staging/imx-drm/imx-drm-of.c | 106 +++++++++++++++++++++++++++++++++++ drivers/staging/imx-drm/imx-drm.h | 4 ++ 3 files changed, 111 insertions(+), 1 deletion(-) create mode 100644 drivers/staging/imx-drm/imx-drm-of.c

diff --git a/drivers/staging/imx-drm/Makefile b/drivers/staging/imx-drm/Makefile index 129e3a3..743b875 100644 --- a/drivers/staging/imx-drm/Makefile +++ b/drivers/staging/imx-drm/Makefile @@ -1,5 +1,5 @@ -imxdrm-objs := imx-drm-core.o +imxdrm-objs := imx-drm-core.o imx-drm-of.o obj-$(CONFIG_DRM_IMX) += imxdrm.o diff --git a/drivers/staging/imx-drm/imx-drm-of.c b/drivers/staging/imx-drm/imx-drm-of.c new file mode 100644 index 0000000..12f37eb --- /dev/null +++ b/drivers/staging/imx-drm/imx-drm-of.c @@ -0,0 +1,106 @@ +/* + * Video Interface OF binding parsing library + * + * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. + * Author: Sylwester Nawrocki <s.nawrocki at samsung.com> + * + * Copyright (C) 2012 Renesas Electronics Corp. + * Author: Guennadi Liakhovetski <g.liakhovetski at 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> + +/* + * imx_drm_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 decremented. + */ +struct device_node *imx_drm_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 ?... / + of_node_put(prev); + return NULL; + } + + 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_GPL(imx_drm_of_get_next_endpoint); + +/ + * imx_drm_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 *imx_drm_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_GPL(imx_drm_of_get_remote_port); diff --git a/drivers/staging/imx-drm/imx-drm.h b/drivers/staging/imx-drm/imx-drm.h index aa21028..9af4a82 100644 --- a/drivers/staging/imx-drm/imx-drm.h +++ b/drivers/staging/imx-drm/imx-drm.h @@ -58,4 +58,8 @@ int imx_drm_connector_mode_valid(struct drm_connector *connector, void imx_drm_connector_destroy(struct drm_connector *connector); void imx_drm_encoder_destroy(struct drm_encoder *encoder); +struct device_node *imx_drm_of_get_next_endpoint( + const struct device_node *parent, struct device_node *prev); +struct device_node *imx_drm_of_get_remote_port(const struct device_node node); + #endif / IMX_DRM_H */

1.8.5.3

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