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@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Tested-by: Miles Chen <miles.chen@mediatek.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20230306140543.1813621-3-angelogioacchino.delregno@collabora.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

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 @@ free_data:
 		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");

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);