clk: meson: aoclk: refactor common code into dedicated file

We try to refactor the common code into one dedicated file,
while preparing to add new Meson-AXG aoclk driver, this would
help us to better share the code by all aoclk drivers.

Suggested-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>

drivers/clk/meson/meson-aoclk.c

@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Amlogic Meson-AXG Clock Controller Driver
+ *
+ * Copyright (c) 2016 BayLibre, SAS.
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ *
+ * Copyright (c) 2018 Amlogic, inc.
+ * Author: Qiufang Dai <qiufang.dai@amlogic.com>
+ * Author: Yixun Lan <yixun.lan@amlogic.com>
+ */
+
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_device.h>
+#include "clk-regmap.h"
+#include "meson-aoclk.h"
+
+static int meson_aoclk_do_reset(struct reset_controller_dev *rcdev,
+			       unsigned long id)
+{
+	struct meson_aoclk_reset_controller *rstc =
+		container_of(rcdev, struct meson_aoclk_reset_controller, reset);
+
+	return regmap_write(rstc->regmap, rstc->data->reset_reg,
+			    BIT(rstc->data->reset[id]));
+}
+
+static const struct reset_control_ops meson_aoclk_reset_ops = {
+	.reset = meson_aoclk_do_reset,
+};
+
+int meson_aoclkc_probe(struct platform_device *pdev)
+{
+	struct meson_aoclk_reset_controller *rstc;
+	struct meson_aoclk_data *data;
+	struct device *dev = &pdev->dev;
+	struct regmap *regmap;
+	int ret, clkid;
+
+	data = (struct meson_aoclk_data *) of_device_get_match_data(dev);
+	if (!data)
+		return -ENODEV;
+
+	rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL);
+	if (!rstc)
+		return -ENOMEM;
+
+	regmap = syscon_node_to_regmap(of_get_parent(dev->of_node));
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "failed to get regmap\n");
+		return PTR_ERR(regmap);
+	}
+
+	/* Reset Controller */
+	rstc->data = data;
+	rstc->regmap = regmap;
+	rstc->reset.ops = &meson_aoclk_reset_ops;
+	rstc->reset.nr_resets = data->num_reset,
+	rstc->reset.of_node = dev->of_node;
+	ret = devm_reset_controller_register(dev, &rstc->reset);
+	if (ret) {
+		dev_err(dev, "failed to register reset controller\n");
+		return ret;
+	}
+
+	/*
+	 * Populate regmap and register all clks
+	 */
+	for (clkid = 0; clkid < data->num_clks; clkid++) {
+		data->clks[clkid]->map = regmap;
+
+		ret = devm_clk_hw_register(dev, data->hw_data->hws[clkid]);
+		if (ret)
+			return ret;
+	}
+
+	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
+		(void *) data->hw_data);
+}