From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752914AbbJFJZM (ORCPT ); Tue, 6 Oct 2015 05:25:12 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:49491 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751973AbbJFJZJ (ORCPT ); Tue, 6 Oct 2015 05:25:09 -0400 From: Archit Taneja To: dri-devel@lists.freedesktop.org, a.hajda@samsung.com Cc: linux-kernel@vger.kernel.org, airlied@linux.ie, daniel@ffwll.ch, treding@nvidia.com, l.stach@pengutronix.de, robh@kernel.org, linux-arm-msm@vger.kernel.org, jani.nikula@linux.intel.com, Archit Taneja Subject: [RFC v2 5/5] drm/dsi: Get DSI host by DT device node Date: Tue, 6 Oct 2015 14:54:42 +0530 Message-Id: <1444123482-25579-6-git-send-email-architt@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1444123482-25579-1-git-send-email-architt@codeaurora.org> References: <1435641851-27295-1-git-send-email-architt@codeaurora.org> <1444123482-25579-1-git-send-email-architt@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org mipi_dsi_devices are inherently aware of their host because they share a parent-child hierarchy in the device tree. Non-dsi drivers that create a dummy dsi device don't have this data. In order to get this information, they require to a phandle to the dsi host in the device tree. Maintain a list of all the hosts DSI that are currently registered. This list will be used to find the mipi_dsi_host corresponding to the device_node passed in of_find_mipi_dsi_host_by_node. Signed-off-by: Archit Taneja --- drivers/gpu/drm/drm_mipi_dsi.c | 30 ++++++++++++++++++++++++++++++ include/drm/drm_mipi_dsi.h | 2 ++ 2 files changed, 32 insertions(+) diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c index cbb7373..c51d73e 100644 --- a/drivers/gpu/drm/drm_mipi_dsi.c +++ b/drivers/gpu/drm/drm_mipi_dsi.c @@ -216,6 +216,28 @@ of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node) return mipi_dsi_device_new(host, &info); } +static DEFINE_MUTEX(host_lock); +static LIST_HEAD(host_list); + +struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node) +{ + struct mipi_dsi_host *host; + + mutex_lock(&host_lock); + + list_for_each_entry(host, &host_list, list) { + if (host->dev->of_node == node) { + mutex_unlock(&host_lock); + return host; + } + } + + mutex_unlock(&host_lock); + + return NULL; +} +EXPORT_SYMBOL(of_find_mipi_dsi_host_by_node); + int mipi_dsi_host_register(struct mipi_dsi_host *host) { struct device_node *node; @@ -227,6 +249,10 @@ int mipi_dsi_host_register(struct mipi_dsi_host *host) of_mipi_dsi_device_add(host, node); } + mutex_lock(&host_lock); + list_add_tail(&host->list, &host_list); + mutex_unlock(&host_lock); + return 0; } EXPORT_SYMBOL(mipi_dsi_host_register); @@ -243,6 +269,10 @@ static int mipi_dsi_remove_device_fn(struct device *dev, void *priv) void mipi_dsi_host_unregister(struct mipi_dsi_host *host) { device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn); + + mutex_lock(&host_lock); + list_del_init(&host->list); + mutex_unlock(&host_lock); } EXPORT_SYMBOL(mipi_dsi_host_unregister); diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h index 68f49f4..15d3068 100644 --- a/include/drm/drm_mipi_dsi.h +++ b/include/drm/drm_mipi_dsi.h @@ -100,10 +100,12 @@ struct mipi_dsi_host_ops { struct mipi_dsi_host { struct device *dev; const struct mipi_dsi_host_ops *ops; + struct list_head list; }; int mipi_dsi_host_register(struct mipi_dsi_host *host); void mipi_dsi_host_unregister(struct mipi_dsi_host *host); +struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node); /* DSI mode flags */ -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation