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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1705941150; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/ZyqSCinvSiL4fDcqtQAts8Vz4wSQZ3zHH00t6lYeGc=; b=TfmmHLC0CAWOqzvzLqf1L/MTDspqvJzrDKRUwwMzj7inwa16XjnR2Tc2kGpy8/XOtAxC5y FZ/z5XqynfDN2uwB1h9t1103vC4umTIdhWDG2mMkQerFy1k2CqdwtFg5La3Azbyq64MW9l 5EUs+pR2o4Mq+U2jhmcAvoamKOVYCRY= From: Sui Jingfeng To: David Airlie Cc: Neil Armstrong , Maxime Ripard , Thomas Zimmermann , Daniel Vetter , Laurent Pinchart , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Sui Jingfeng Subject: [PATCH 1/5] drm/bridge: Add drm_bridge_find_by_fwnode() helper Date: Tue, 23 Jan 2024 00:32:16 +0800 Message-Id: <20240122163220.110788-2-sui.jingfeng@linux.dev> In-Reply-To: <20240122163220.110788-1-sui.jingfeng@linux.dev> References: <20240122163220.110788-1-sui.jingfeng@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1788812653667380441 X-GMAIL-MSGID: 1788812653667380441 Because ACPI based systems only has the fwnode associated, the of_node member of struct device is NULL. To order to move things forward, we add drm_bridge_find_by_fwnode() to extend the support. Signed-off-by: Sui Jingfeng --- drivers/gpu/drm/drm_bridge.c | 33 +++++++++++++++++++++++++++++++++ include/drm/drm_bridge.h | 4 ++++ 2 files changed, 37 insertions(+) diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index cee3188adf3d..ffd969adc2fb 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -1347,6 +1347,39 @@ struct drm_bridge *of_drm_find_bridge(struct device_node *np) EXPORT_SYMBOL(of_drm_find_bridge); #endif +/** + * drm_bridge_find_by_fwnode - Find the bridge corresponding to the associated fwnode + * + * @fwnode: fwnode for which to find the matching drm_bridge + * + * This function looks up a drm_bridge based on its associated fwnode. + * + * RETURNS: + * A reference to the drm_bridge control structure if found, NULL on failure. + */ +struct drm_bridge *drm_bridge_find_by_fwnode(struct fwnode_handle *fwnode) +{ + struct drm_bridge *ret = NULL; + struct drm_bridge *bridge; + + if (!fwnode) + return NULL; + + mutex_lock(&bridge_lock); + + list_for_each_entry(bridge, &bridge_list, list) { + if (bridge->fwnode == fwnode) { + ret = bridge; + break; + } + } + + mutex_unlock(&bridge_lock); + + return ret; +} +EXPORT_SYMBOL(drm_bridge_find_by_fwnode); + MODULE_AUTHOR("Ajay Kumar "); MODULE_DESCRIPTION("DRM bridge infrastructure"); MODULE_LICENSE("GPL and additional rights"); diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index e39da5807ba7..fe3d5f4bf37f 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -720,6 +720,8 @@ struct drm_bridge { struct list_head chain_node; /** @of_node: device node pointer to the bridge */ struct device_node *of_node; + /** @fwnode: associated fwnode supplied by platform firmware */ + struct fwnode_handle *fwnode; /** @list: to keep track of all added bridges */ struct list_head list; /** @@ -796,6 +798,8 @@ static inline struct drm_bridge *of_drm_find_bridge(struct device_node *np) } #endif +struct drm_bridge *drm_bridge_find_by_fwnode(struct fwnode_handle *fwnode); + /** * drm_bridge_get_next_bridge() - Get the next bridge in the chain * @bridge: bridge object