clk: mediatek: mt8135-apmixedsys: Convert to platform_driver and module

Convert apmixedsys clocks to be a platform driver; while at it, also
add necessary error handling to the probe function, add a remove
callback and provide a MODULE_DESCRIPTION().

This driver is now compatible with an eventual module build.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20230306140543.1813621-53-angelogioacchino.delregno@collabora.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: AngeloGioacchino Del Regno

drivers/clk/mediatek/clk-mt8135-apmixedsys.c

@@ -47,16 +47,59 @@ static const struct mtk_pll_data plls[] = {
 	PLL(CLK_APMIXED_VDECPLL, "vdecpll", 0x304, 0x31c, 0x80000000, 0, 21, 0x2b0, 6, 0x0, 0x308, 0),
 };
 
-static void __init mtk_apmixedsys_init(struct device_node *node)
+static int clk_mt8135_apmixed_probe(struct platform_device *pdev)
 {
 	struct clk_hw_onecell_data *clk_data;
+	struct device_node *node = pdev->dev.of_node;
+	int ret;
 
 	clk_data = mtk_alloc_clk_data(CLK_APMIXED_NR_CLK);
 	if (!clk_data)
-		return;
+		return -ENOMEM;
 
-	mtk_clk_register_plls(node, plls, ARRAY_SIZE(plls), clk_data);
+	ret = mtk_clk_register_plls(node, plls, ARRAY_SIZE(plls), clk_data);
+	if (ret)
+		return ret;
+
+	ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
+	if (ret)
+		goto unregister_plls;
+
+	return 0;
+
+unregister_plls:
+	mtk_clk_unregister_plls(plls, ARRAY_SIZE(plls), clk_data);
+
+	return ret;
+}
+
+static int clk_mt8135_apmixed_remove(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct clk_hw_onecell_data *clk_data = platform_get_drvdata(pdev);
+
+	of_clk_del_provider(node);
+	mtk_clk_unregister_plls(plls, ARRAY_SIZE(plls), clk_data);
+	mtk_free_clk_data(clk_data);
+
+	return 0;
 }
-CLK_OF_DECLARE(mtk_apmixedsys, "mediatek,mt8135-apmixedsys",
-		mtk_apmixedsys_init);
+
+static const struct of_device_id of_match_clk_mt8135_apmixed[] = {
+	{ .compatible = "mediatek,mt8135-apmixedsys" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_match_clk_mt8135_apmixed);
+
+static struct platform_driver clk_mt8135_apmixed_drv = {
+	.probe = clk_mt8135_apmixed_probe,
+	.remove = clk_mt8135_apmixed_remove,
+	.driver = {
+		.name = "clk-mt8135-apmixed",
+		.of_match_table = of_match_clk_mt8135_apmixed,
+	},
+};
+module_platform_driver(clk_mt8135_apmixed_drv)
+
+MODULE_DESCRIPTION("MediaTek MT8135 apmixedsys clocks driver");
 MODULE_LICENSE("GPL");