clk: mediatek: mt8173-infracfg: Handle unallocated infracfg when module

The MT8173 infracfg clock driver does initialization in two steps, via a
CLK_OF_DECLARE_DRIVER declaration. However its early init function
doesn't get to run when it's built as a module, presumably since it's
not loaded by the time it would have been called by of_clk_init(). This
causes its second-step probe() to return -ENOMEM when trying to register
clocks, as the necessary clock_data struct isn't initialized by the
first step.

MT2701 and MT6797 clock drivers also use this mechanism, but they try to
allocate the necessary clock_data structure if missing in the second
step. Mimic that for the MT8173 infracfg clock as well to make it work
as a module.
Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Link: https://lore.kernel.org/r/20240612201211.91683-1-alpernebiyasak@gmail.comReviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/mediatek/clk-mt8173-infracfg.c

@@ -98,7 +98,17 @@ CLK_OF_DECLARE_DRIVER(mtk_infrasys, "mediatek,mt8173-infracfg",
 static int clk_mt8173_infracfg_probe(struct platform_device *pdev)
 {
 	struct device_node *node = pdev->dev.of_node;
-	int r;
+	int r, i;
+
+	if (!infra_clk_data) {
+		infra_clk_data = mtk_alloc_clk_data(CLK_INFRA_NR_CLK);
+		if (!infra_clk_data)
+			return -ENOMEM;
+	} else {
+		for (i = 0; i < CLK_INFRA_NR_CLK; i++)
+			if (infra_clk_data->hws[i] == ERR_PTR(-EPROBE_DEFER))
+				infra_clk_data->hws[i] = ERR_PTR(-ENOENT);
+	}
 
 	r = mtk_clk_register_gates(&pdev->dev, node, infra_gates,
 				   ARRAY_SIZE(infra_gates), infra_clk_data);