From mboxrd@z Thu Jan 1 00:00:00 1970 From: Philipp Zabel Subject: [RFC PATCH v3 2/9] staging: imx-drm: Add temporary copies of v4l2-of parsing functions Date: Tue, 18 Feb 2014 12:36:03 +0100 Message-ID: <1392723370-4772-3-git-send-email-p.zabel@pengutronix.de> References: <1392723370-4772-1-git-send-email-p.zabel@pengutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1392723370-4772-1-git-send-email-p.zabel@pengutronix.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: driverdev-devel-bounces@linuxdriverproject.org Sender: driverdev-devel-bounces@linuxdriverproject.org To: Russell King - ARM Linux Cc: devel@driverdev.osuosl.org, devicetree@vger.kernel.org, Philipp Zabel , David Airlie , Greg Kroah-Hartman , dri-devel@lists.freedesktop.org, kernel@pengutronix.de, Grant Likely , Shawn Guo , linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org From: Philipp Zabel The existing v4l2-of parser functions for the video interface bindings described in Documentation/device-tree/bindings/media/video-interfaces.txt are useful for DRM drivers, too. They will be moved to drivers/media so they can be used by drm drivers, too. Until then, duplicate the v4l2-of parser functions temporarily. Signed-off-by: Philipp Zabel --- drivers/staging/imx-drm/Makefile | 2 +- drivers/staging/imx-drm/imx-drm-of.c | 132 +++++++++++++++++++++++++++++++++++ drivers/staging/imx-drm/imx-drm.h | 6 ++ 3 files changed, 139 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..e14b4f3 --- /dev/null +++ b/drivers/staging/imx-drm/imx-drm-of.c @@ -0,0 +1,132 @@ +/* + * Video Interface OF binding parsing library + * + * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. + * Author: Sylwester Nawrocki + * + * Copyright (C) 2012 Renesas Electronics Corp. + * Author: Guennadi Liakhovetski + * + * 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 +#include + +/** + * imx_drm_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 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_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 *imx_drm_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(imx_drm_of_get_remote_port_parent); + +/** + * 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..793a80b 100644 --- a/drivers/staging/imx-drm/imx-drm.h +++ b/drivers/staging/imx-drm/imx-drm.h @@ -58,4 +58,10 @@ 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_parent( + const struct device_node *node); +struct device_node *imx_drm_of_get_remote_port(const struct device_node *node); + #endif /* _IMX_DRM_H_ */ -- 1.8.5.3