clk: amlogic: add probe helper for mmio based controllers

Add a 2nd probe function helper for mmio based controllers, which
are getting the memory region from a resource instead of a syscon.

Link: https://lore.kernel.org/r/20250825-meson-clk-cleanup-24-v2-2-0f402f01e117@baylibre.com
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>

2 files changed, 50 insertions, 13 deletions

diff --git a/drivers/clk/meson/meson-clkc-utils.c b/drivers/clk/meson/meson-clkc-utils.c
index 49f562d0f203..870f50548e26 100644
--- a/drivers/clk/meson/meson-clkc-utils.c
+++ b/drivers/clk/meson/meson-clkc-utils.c
@@ -26,12 +26,9 @@ struct clk_hw *meson_clk_hw_get(struct of_phandle_args *clkspec, void *clk_hw_da
 }
 EXPORT_SYMBOL_NS_GPL(meson_clk_hw_get, "CLK_MESON");
 
-int meson_clkc_syscon_probe(struct platform_device *pdev)
+static int meson_clkc_init(struct device *dev, struct regmap *map)
 {
 	const struct meson_clkc_data *data;
-	struct device *dev = &pdev->dev;
-	struct device_node *np;
-	struct regmap *map;
 	struct clk_hw *hw;
 	int ret, i;
 
@@ -39,15 +36,6 @@ int meson_clkc_syscon_probe(struct platform_device *pdev)
 	if (!data)
 		return -EINVAL;
 
-	np = of_get_parent(dev->of_node);
-	map = syscon_node_to_regmap(np);
-	of_node_put(np);
-	if (IS_ERR(map)) {
-		dev_err(dev,
-			"failed to get parent syscon regmap\n");
-		return PTR_ERR(map);
-	}
-
 	if (data->init_count)
 		regmap_multi_reg_write(map, data->init_regs, data->init_count);
 
@@ -68,8 +56,56 @@ int meson_clkc_syscon_probe(struct platform_device *pdev)
 
 	return devm_of_clk_add_hw_provider(dev, meson_clk_hw_get, (void *)&data->hw_clks);
 }
+
+int meson_clkc_syscon_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np;
+	struct regmap *map;
+
+	np = of_get_parent(dev->of_node);
+	map = syscon_node_to_regmap(np);
+	of_node_put(np);
+	if (IS_ERR(map)) {
+		dev_err(dev, "failed to get parent syscon regmap\n");
+		return PTR_ERR(map);
+	}
+
+	return meson_clkc_init(dev, map);
+}
 EXPORT_SYMBOL_NS_GPL(meson_clkc_syscon_probe, "CLK_MESON");
 
+int meson_clkc_mmio_probe(struct platform_device *pdev)
+{
+	const struct meson_clkc_data *data;
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	void __iomem *base;
+	struct regmap *map;
+	struct regmap_config regmap_cfg = {
+			.reg_bits	= 32,
+			.val_bits	= 32,
+			.reg_stride	= 4,
+	};
+
+	data = of_device_get_match_data(dev);
+	if (!data)
+		return -EINVAL;
+
+	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	regmap_cfg.max_register = resource_size(res) - regmap_cfg.reg_stride;
+
+	map = devm_regmap_init_mmio(dev, base, &regmap_cfg);
+	if (IS_ERR(map))
+		return PTR_ERR(map);
+
+	return meson_clkc_init(dev, map);
+}
+EXPORT_SYMBOL_NS_GPL(meson_clkc_mmio_probe, "CLK_MESON");
+
 MODULE_DESCRIPTION("Amlogic Clock Controller Utilities");
 MODULE_LICENSE("GPL");
 MODULE_IMPORT_NS("CLK_MESON");
diff --git a/drivers/clk/meson/meson-clkc-utils.h b/drivers/clk/meson/meson-clkc-utils.h
index 26cd47544302..b45f85f630d7 100644
--- a/drivers/clk/meson/meson-clkc-utils.h
+++ b/drivers/clk/meson/meson-clkc-utils.h
@@ -25,5 +25,6 @@ struct meson_clkc_data {
 };
 
 int meson_clkc_syscon_probe(struct platform_device *pdev);
+int meson_clkc_mmio_probe(struct platform_device *pdev);
 
 #endif