linux-kernel - [PATCH v4 02/54] clk: mediatek: clk-mtk: Introduce clk_mtk_pdev

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Message-Id: <20230221115549.360132-3-angelogioacchino.delregno@collabora.com>
Date:   Tue, 21 Feb 2023 12:54:57 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     mturquette@...libre.com
Cc:     sboyd@...nel.org, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com, wenst@...omium.org,
        johnson.wang@...iatek.com, miles.chen@...iatek.com,
        chun-jie.chen@...iatek.com, daniel@...rotopia.org,
        fparent@...libre.com, msp@...libre.com, nfraprado@...labora.com,
        rex-bc.chen@...iatek.com, zhaojh329@...il.com,
        sam.shih@...iatek.com, edward-jw.yang@...iatek.com,
        yangyingliang@...wei.com, granquet@...libre.com,
        pablo.sun@...iatek.com, sean.wang@...iatek.com,
        chen.zhong@...iatek.com, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH v4 02/54] clk: mediatek: clk-mtk: Introduce clk_mtk_pdev_{probe,remove}()

Introduce functions clk_mtk_pdev_probe() and clk_mtk_pdev_remove():
these will be useful to commonize the probe and remove handlers for
multimedia (clk-mtxxxx-mm) drivers as these are registered by the
mtk-mmsys driver instead of having their own devicetree compatible.

In order to do this, the main logic of clk_mtk_simple{probe,remove}()
was moved to new static __clk_mtk_simple_{probe,remove}() functions
that take as parameter a pointer to struct device_node because when
registering the clocks from mtk-mmsys we want to pass a pointer to
the clock driver's parent (which is, obviously, mtk-mmsys) struct
device_node instead.

As for the clock driver's platform data: for the devicetree case, we
keep using the standard match_data mechanism, else we retrieve it
from an id_table.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>
---
 drivers/clk/mediatek/clk-mtk.c | 54 +++++++++++++++++++++++++++++-----
 drivers/clk/mediatek/clk-mtk.h |  2 ++
 2 files changed, 48 insertions(+), 8 deletions(-)

diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c
index f0b723372b52..990be3d62db2 100644
--- a/drivers/clk/mediatek/clk-mtk.c
+++ b/drivers/clk/mediatek/clk-mtk.c
@@ -462,17 +462,25 @@ void mtk_clk_unregister_dividers(const struct mtk_clk_divider *mcds, int num,
 }
 EXPORT_SYMBOL_GPL(mtk_clk_unregister_dividers);
 
-int mtk_clk_simple_probe(struct platform_device *pdev)
+static int __mtk_clk_simple_probe(struct platform_device *pdev,
+				  struct device_node *node)
 {
+	const struct platform_device_id *id;
 	const struct mtk_clk_desc *mcd;
 	struct clk_hw_onecell_data *clk_data;
-	struct device_node *node = pdev->dev.of_node;
 	void __iomem *base;
 	int num_clks, r;
 
 	mcd = device_get_match_data(&pdev->dev);
-	if (!mcd)
-		return -EINVAL;
+	if (!mcd) {
+		/* Clock driver wasn't registered from devicetree */
+		id = platform_get_device_id(pdev);
+		if (id)
+			mcd = (const struct mtk_clk_desc *)id->driver_data;
+
+		if (!mcd)
+			return -EINVAL;
+	}
 
 	/* Composite clocks needs us to pass iomem pointer */
 	if (mcd->composite_clks) {
@@ -581,13 +589,12 @@ int mtk_clk_simple_probe(struct platform_device *pdev)
 		iounmap(base);
 	return r;
 }
-EXPORT_SYMBOL_GPL(mtk_clk_simple_probe);
 
-int mtk_clk_simple_remove(struct platform_device *pdev)
+static int __mtk_clk_simple_remove(struct platform_device *pdev,
+				   struct device_node *node)
 {
-	const struct mtk_clk_desc *mcd = device_get_match_data(&pdev->dev);
 	struct clk_hw_onecell_data *clk_data = platform_get_drvdata(pdev);
-	struct device_node *node = pdev->dev.of_node;
+	const struct mtk_clk_desc *mcd = device_get_match_data(&pdev->dev);
 
 	of_clk_del_provider(node);
 	if (mcd->clks)
@@ -608,6 +615,37 @@ int mtk_clk_simple_remove(struct platform_device *pdev)
 
 	return 0;
 }
+
+int mtk_clk_pdev_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->parent->of_node;
+
+	return __mtk_clk_simple_probe(pdev, node);
+}
+EXPORT_SYMBOL_GPL(mtk_clk_pdev_probe);
+
+int mtk_clk_simple_probe(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+
+	return __mtk_clk_simple_probe(pdev, node);
+}
+EXPORT_SYMBOL_GPL(mtk_clk_simple_probe);
+
+int mtk_clk_pdev_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->parent->of_node;
+
+	return __mtk_clk_simple_remove(pdev, node);
+}
+EXPORT_SYMBOL_GPL(mtk_clk_pdev_remove);
+
+int mtk_clk_simple_remove(struct platform_device *pdev)
+{
+	return __mtk_clk_simple_remove(pdev, pdev->dev.of_node);
+}
 EXPORT_SYMBOL_GPL(mtk_clk_simple_remove);
 
 MODULE_LICENSE("GPL");
diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
index 41f4fa3b0c21..b8e0ff8f52fa 100644
--- a/drivers/clk/mediatek/clk-mtk.h
+++ b/drivers/clk/mediatek/clk-mtk.h
@@ -236,6 +236,8 @@ struct mtk_clk_desc {
 	unsigned int mfg_clk_idx;
 };
 
+int mtk_clk_pdev_probe(struct platform_device *pdev);
+int mtk_clk_pdev_remove(struct platform_device *pdev);
 int mtk_clk_simple_probe(struct platform_device *pdev);
 int mtk_clk_simple_remove(struct platform_device *pdev);
 
-- 
2.39.1