Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754386AbbLJMm0 (ORCPT ); Thu, 10 Dec 2015 07:42:26 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:36673 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754201AbbLJMmO (ORCPT ); Thu, 10 Dec 2015 07:42:14 -0500 From: Archit Taneja To: dri-devel@lists.freedesktop.org, a.hajda@samsung.com, jani.nikula@linux.intel.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, Archit Taneja Subject: [PATCH v4 6/6] drm/dsi: Get DSI host by DT device node Date: Thu, 10 Dec 2015 18:11:40 +0530 Message-Id: <1449751300-2841-7-git-send-email-architt@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1449751300-2841-1-git-send-email-architt@codeaurora.org> References: <1448884892-7731-1-git-send-email-architt@codeaurora.org> <1449751300-2841-1-git-send-email-architt@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3523 Lines: 113 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 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. Reviewed-by: Andrzej Hajda Signed-off-by: Archit Taneja --- drivers/gpu/drm/drm_mipi_dsi.c | 38 ++++++++++++++++++++++++++++++++++++++ include/drm/drm_mipi_dsi.h | 3 +++ 2 files changed, 41 insertions(+) diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c index 7a81171..e40a665 100644 --- a/drivers/gpu/drm/drm_mipi_dsi.c +++ b/drivers/gpu/drm/drm_mipi_dsi.c @@ -213,6 +213,36 @@ of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node) } #endif +static DEFINE_MUTEX(host_lock); +static LIST_HEAD(host_list); + +/** + * of_find_mipi_dsi_host_by_node() - find the MIPI DSI host matching a + * device tree node + * @node: device tree node + * + * Return: A pointer to the MIPI DSI host corresponding to @np or NULL if no + * such device exists (or has not been registered yet). + */ +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; @@ -224,6 +254,10 @@ 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); @@ -240,6 +274,10 @@ 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 410d8b5..e5c1df9 100644 --- a/include/drm/drm_mipi_dsi.h +++ b/include/drm/drm_mipi_dsi.h @@ -96,14 +96,17 @@ struct mipi_dsi_host_ops { * struct mipi_dsi_host - DSI host device * @dev: driver model device node for this DSI host * @ops: DSI host operations + * @list: list management */ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/