linux-kernel - [PATCH v3 5/8] media: mtk-mdp: search for vpu node instead of linking it to a property

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Message-Id: <20210618175059.v3.5.I0cbd6691d3edfa2757bd6f5de7acfce94b101480@changeid>
Date:   Fri, 18 Jun 2021 17:52:06 +1000
From:   Eizan Miyamoto <eizan@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     yong.wu@...iatek.com, houlong.wei@...iatek.com,
        enric.balletbo@...labora.com, chunkuang.hu@...nel.org,
        wenst@...omium.org, Eizan Miyamoto <eizan@...omium.org>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Minghsiu Tsai <minghsiu.tsai@...iatek.com>,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH v3 5/8] media: mtk-mdp: search for vpu node instead of linking it to a property

Since there is only one vpu node, it suffices to search for it instead
of having a link coded into the primary mdp device node.

Signed-off-by: Eizan Miyamoto <eizan@...omium.org>
---

(no changes since v1)

 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c |  6 ----
 drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 28 +++++++++++++------
 2 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
index fdbb46a5330a..3d9bb7265159 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -117,12 +117,6 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
 	if (vpu_node) {
 		int ret;
 
-		mdp->vpu_dev = of_find_device_by_node(vpu_node);
-		if (WARN_ON(!mdp->vpu_dev)) {
-			dev_err(dev, "vpu pdev failed\n");
-			of_node_put(vpu_node);
-		}
-
 		ret = v4l2_device_register(dev, &mdp->v4l2_dev);
 		if (ret) {
 			dev_err(dev, "Failed to register v4l2 device\n");
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
index 267e4cb4bf32..48e9a557c446 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -113,6 +113,7 @@ static void release_of(struct device *dev, void *data)
 static int mtk_mdp_master_bind(struct device *dev)
 {
 	int status;
+	struct device_node *vpu_node;
 	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
 
 	status = component_bind_all(dev, mdp);
@@ -121,15 +122,24 @@ static int mtk_mdp_master_bind(struct device *dev)
 		goto err_component_bind_all;
 	}
 
-	if (mdp->vpu_dev) {
-		int ret = vpu_wdt_reg_handler(mdp->vpu_dev, mtk_mdp_reset_handler, mdp,
-					  VPU_RST_MDP);
-		if (ret) {
-			dev_err(dev, "Failed to register reset handler\n");
-			goto err_wdt_reg;
-		}
-	} else {
-		dev_err(dev, "no vpu_dev found\n");
+	vpu_node = of_find_node_by_name(NULL, "vpu");
+	if (!vpu_node) {
+		dev_err(dev, "unable to find vpu node");
+		status = -ENODEV;
+		goto err_wdt_reg;
+	}
+
+	mdp->vpu_dev = of_find_device_by_node(vpu_node);
+	if (!mdp->vpu_dev) {
+		dev_err(dev, "unable to find vpu device");
+		status = -ENODEV;
+		goto err_wdt_reg;
+	}
+
+	status = vpu_wdt_reg_handler(mdp->vpu_dev, mtk_mdp_reset_handler, mdp, VPU_RST_MDP);
+	if (status) {
+		dev_err(dev, "Failed to register reset handler\n");
+		goto err_wdt_reg;
 	}
 
 	status = mtk_mdp_register_m2m_device(mdp);
-- 
2.32.0.288.g62a8d224e6-goog