linux-kernel - [PATCH v7 6/7] soc: mediatek: mmsys: instantiate mdp virtual device from mmsys

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Message-Id: <20210825163247.v7.6.Ie4214d2cc73ab276dd7c41d4f63c98e011fb42d4@changeid>
Date:   Wed, 25 Aug 2021 16:33:22 +1000
From:   Eizan Miyamoto <eizan@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     chunkuang.hu@...nel.org, yong.wu@...iatek.com, wenst@...omium.org,
        ck.hu@...iatek.com, houlong.wei@...iatek.com,
        enric.balletbo@...labora.com, yongqiang.niu@...iatek.com,
        Eizan Miyamoto <eizan@...omium.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH v7 6/7] soc: mediatek: mmsys: instantiate mdp virtual device from mmsys

A virtual device that is probed by the mtk_mdp_core driver is
instantiated by the mtk_mmsys driver.

This better reflects the logical organization of the hardware and
driver: there are a number of hardware blocks that are used by the MDP
that have no strict hierarchy, and the software driver is responsible
for driving them properly.

Signed-off-by: Eizan Miyamoto <eizan@...omium.org>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Reviewed-by: Houlong Wei <houlong.wei@...iatek.com>
---

(no changes since v1)

 drivers/soc/mediatek/mtk-mmsys.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c
index 080660ef11bf..e681029fe804 100644
--- a/drivers/soc/mediatek/mtk-mmsys.c
+++ b/drivers/soc/mediatek/mtk-mmsys.c
@@ -97,6 +97,7 @@ static int mtk_mmsys_probe(struct platform_device *pdev)
 	struct platform_device *clks;
 	struct platform_device *drm;
 	struct mtk_mmsys *mmsys;
+	struct platform_device *mdp;
 	int ret;
 
 	mmsys = devm_kzalloc(dev, sizeof(*mmsys), GFP_KERNEL);
@@ -122,10 +123,27 @@ static int mtk_mmsys_probe(struct platform_device *pdev)
 					    PLATFORM_DEVID_AUTO, NULL, 0);
 	if (IS_ERR(drm)) {
 		platform_device_unregister(clks);
-		return PTR_ERR(drm);
+		ret = PTR_ERR(drm);
+		goto err_drm;
+	}
+
+	mdp = platform_device_register_data(&pdev->dev, "mtk-mdp",
+					    PLATFORM_DEVID_AUTO, NULL, 0);
+	if (IS_ERR(mdp)) {
+		ret = PTR_ERR(mdp);
+		dev_err(dev, "Failed to register mdp: %d\n", ret);
+		goto err_mdp;
 	}
 
 	return 0;
+
+err_mdp:
+	platform_device_unregister(drm);
+
+err_drm:
+	platform_device_unregister(clks);
+
+	return ret;
 }
 
 static const struct of_device_id of_match_mtk_mmsys[] = {
-- 
2.33.0.rc2.250.ged5fa647cd-goog