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From:   Stephen Boyd <swboyd@chromium.org>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Douglas Anderson <dianders@chromium.org>
Cc:     linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
        Yong Wu <yong.wu@mediatek.com>, Joerg Roedel <joro@8bytes.org>,
        Will Deacon <will@kernel.org>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Rob Clark <robdclark@gmail.com>,
        Russell King <rmk+kernel@arm.linux.org.uk>,
        Saravana Kannan <saravanak@google.com>
Subject: [PATCH v6 25/35] iommu/mediatek: Migrate to aggregate driver
Date:   Thu, 27 Jan 2022 12:01:31 -0800
Message-Id: <20220127200141.1295328-26-swboyd@chromium.org>
In-Reply-To: <20220127200141.1295328-1-swboyd@chromium.org>
References: <20220127200141.1295328-1-swboyd@chromium.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Use an aggregate driver instead of component ops so that we can get
proper driver probe ordering of the aggregate device with respect to all
the component devices that make up the aggregate device.

Cc: Yong Wu <yong.wu@mediatek.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Will Deacon <will@kernel.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Saravana Kannan <saravanak@google.com>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/iommu/mtk_iommu.c    | 14 +++++++++-----
 drivers/iommu/mtk_iommu.h    |  6 ++++--
 drivers/iommu/mtk_iommu_v1.c | 14 +++++++++-----
 drivers/memory/mtk-smi.c     | 10 ++++------
 4 files changed, 26 insertions(+), 18 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 25b834104790..8e722898cbe2 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -752,9 +752,13 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
 	return 0;
 }
 
-static const struct component_master_ops mtk_iommu_com_ops = {
-	.bind		= mtk_iommu_bind,
-	.unbind		= mtk_iommu_unbind,
+static struct aggregate_driver mtk_iommu_aggregate_driver = {
+	.probe		= mtk_iommu_bind,
+	.remove		= mtk_iommu_unbind,
+	.driver		= {
+		.name	= "mtk_iommu_agg",
+		.owner	= THIS_MODULE,
+	},
 };
 
 static int mtk_iommu_probe(struct platform_device *pdev)
@@ -895,7 +899,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
 			goto out_list_del;
 	}
 
-	ret = component_master_add_with_match(dev, &mtk_iommu_com_ops, match);
+	ret = component_aggregate_register(dev, &mtk_iommu_aggregate_driver, match);
 	if (ret)
 		goto out_bus_set_null;
 	return ret;
@@ -928,7 +932,7 @@ static int mtk_iommu_remove(struct platform_device *pdev)
 	device_link_remove(data->smicomm_dev, &pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	devm_free_irq(&pdev->dev, data->irq, data);
-	component_master_del(&pdev->dev, &mtk_iommu_com_ops);
+	component_aggregate_unregister(&pdev->dev, &mtk_iommu_aggregate_driver);
 	return 0;
 }
 
diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index f81fa8862ed0..125be5819c42 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -94,15 +94,17 @@ static inline void release_of(struct device *dev, void *data)
 	of_node_put(data);
 }
 
-static inline int mtk_iommu_bind(struct device *dev)
+static inline int mtk_iommu_bind(struct aggregate_device *adev)
 {
+	struct device *dev = aggregate_device_parent(adev);
 	struct mtk_iommu_data *data = dev_get_drvdata(dev);
 
 	return component_bind_all(dev, &data->larb_imu);
 }
 
-static inline void mtk_iommu_unbind(struct device *dev)
+static inline void mtk_iommu_unbind(struct aggregate_device *adev)
 {
+	struct device *dev = aggregate_device_parent(adev);
 	struct mtk_iommu_data *data = dev_get_drvdata(dev);
 
 	component_unbind_all(dev, &data->larb_imu);
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index be22fcf988ce..5fb29058a165 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -534,9 +534,13 @@ static const struct of_device_id mtk_iommu_of_ids[] = {
 	{}
 };
 
-static const struct component_master_ops mtk_iommu_com_ops = {
-	.bind		= mtk_iommu_bind,
-	.unbind		= mtk_iommu_unbind,
+static struct aggregate_driver mtk_iommu_aggregate_driver = {
+	.probe		= mtk_iommu_bind,
+	.remove		= mtk_iommu_unbind,
+	.driver		= {
+		.name	= "mtk_iommu_agg",
+		.owner	= THIS_MODULE,
+	},
 };
 
 static int mtk_iommu_probe(struct platform_device *pdev)
@@ -624,7 +628,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
 			goto out_dev_unreg;
 	}
 
-	ret = component_master_add_with_match(dev, &mtk_iommu_com_ops, match);
+	ret = component_aggregate_register(dev, &mtk_iommu_aggregate_driver, match);
 	if (ret)
 		goto out_bus_set_null;
 	return ret;
@@ -650,7 +654,7 @@ static int mtk_iommu_remove(struct platform_device *pdev)
 
 	clk_disable_unprepare(data->bclk);
 	devm_free_irq(&pdev->dev, data->irq, data);
-	component_master_del(&pdev->dev, &mtk_iommu_com_ops);
+	component_aggregate_unregister(&pdev->dev, &mtk_iommu_aggregate_driver);
 	return 0;
 }
 
diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
index e201e5976f34..0910fe109f53 100644
--- a/drivers/memory/mtk-smi.c
+++ b/drivers/memory/mtk-smi.c
@@ -175,6 +175,8 @@ mtk_smi_larb_bind(struct device *dev, struct device *master, void *data)
 			larb->larbid = i;
 			larb->mmu = &larb_mmu[i].mmu;
 			larb->bank = larb_mmu[i].bank;
+
+			pm_runtime_enable(dev);
 			return 0;
 		}
 	}
@@ -450,15 +452,11 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
-	pm_runtime_enable(dev);
 	platform_set_drvdata(pdev, larb);
 	ret = component_add(dev, &mtk_smi_larb_component_ops);
-	if (ret)
-		goto err_pm_disable;
-	return 0;
+	if (!ret)
+		return 0;
 
-err_pm_disable:
-	pm_runtime_disable(dev);
 	device_link_remove(dev, larb->smi_common_dev);
 	return ret;
 }
-- 
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