linux-kernel - [RFC PATCH 3/9] reset: amlogic: split the device and platform probe

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Date: Thu, 16 May 2024 17:08:33 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Philipp Zabel <p.zabel@...gutronix.de>,
	Stephen Boyd <sboyd@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>
Cc: Jerome Brunet <jbrunet@...libre.com>,
	Jan Dakinevich <jan.dakinevich@...utedevices.com>,
	linux-kernel@...r.kernel.org,
	linux-amlogic@...ts.infradead.org,
	linux-clk@...r.kernel.org
Subject: [RFC PATCH 3/9] reset: amlogic: split the device and platform probe

To prepare the addition of the auxiliary device support, split
the device probe from the probe of the platform device.

The device probe will be common to both the platform and auxiliary
driver.

Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
 drivers/reset/reset-meson.c | 55 +++++++++++++++++++++++--------------
 1 file changed, 34 insertions(+), 21 deletions(-)

diff --git a/drivers/reset/reset-meson.c b/drivers/reset/reset-meson.c
index 59126c9f194a..fec55321b52b 100644
--- a/drivers/reset/reset-meson.c
+++ b/drivers/reset/reset-meson.c
@@ -87,6 +87,27 @@ static const struct reset_control_ops meson_reset_ops = {
 	.deassert	= meson_reset_deassert,
 };
 
+static int meson_reset_probe(struct device *dev, struct regmap *map,
+			     const struct meson_reset_param *param)
+{
+	unsigned int stride = regmap_get_reg_stride(map);
+	struct meson_reset *data;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->param = param;
+	data->map = map;
+	data->rcdev.owner = dev->driver->owner;
+	data->rcdev.nr_resets = param->reg_count * BITS_PER_BYTE
+		* stride;
+	data->rcdev.ops = &meson_reset_ops;
+	data->rcdev.of_node = dev->of_node;
+
+	return devm_reset_controller_register(dev, &data->rcdev);
+}
+
 static const struct meson_reset_param meson8b_param = {
 	.reg_count	= 8,
 	.reset_offset	= 0x0,
@@ -125,46 +146,38 @@ static const struct regmap_config regmap_config = {
 	.reg_stride = 4,
 };
 
-static int meson_reset_probe(struct platform_device *pdev)
+static int meson_reset_pltf_probe(struct platform_device *pdev)
 {
+
+	const struct meson_reset_param *param;
 	struct device *dev = &pdev->dev;
-	struct meson_reset *data;
+	struct regmap *map;
 	void __iomem *base;
 
-	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
 	base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
-	data->param = of_device_get_match_data(dev);
-	if (!data->param)
+	param = of_device_get_match_data(dev);
+	if (!param)
 		return -ENODEV;
 
-	data->map = devm_regmap_init_mmio(dev, base, &regmap_config);
-	if (IS_ERR(data->map))
-		return dev_err_probe(dev, PTR_ERR(data->map),
+	map = devm_regmap_init_mmio(dev, base, &regmap_config);
+	if (IS_ERR(map))
+		return dev_err_probe(dev, PTR_ERR(map),
 				     "can't init regmap mmio region\n");
 
-	data->rcdev.owner = THIS_MODULE;
-	data->rcdev.nr_resets = data->param->reg_count * BITS_PER_BYTE
-		* regmap_config.reg_stride;
-	data->rcdev.ops = &meson_reset_ops;
-	data->rcdev.of_node = dev->of_node;
-
-	return devm_reset_controller_register(dev, &data->rcdev);
+	return meson_reset_probe(dev, map, param);
 }
 
-static struct platform_driver meson_reset_driver = {
-	.probe	= meson_reset_probe,
+static struct platform_driver meson_reset_pltf_driver = {
+	.probe	= meson_reset_pltf_probe,
 	.driver = {
 		.name		= "meson_reset",
 		.of_match_table	= meson_reset_dt_ids,
 	},
 };
-module_platform_driver(meson_reset_driver);
+module_platform_driver(meson_reset_pltf_driver);
 
 MODULE_DESCRIPTION("Amlogic Meson Reset Controller driver");
 MODULE_AUTHOR("Neil Armstrong <narmstrong@...libre.com>");
-- 
2.43.0