[PATCH v6 5/5] reset: starfive: Add syscon reset driver support

[Changhuang Liang]

Add syscon reset driver for JHB100 SoC.

Signed-off-by: Changhuang Liang <changhuang.liang at starfivetech.com>
---
 drivers/reset/starfive/Kconfig                |  9 +++
 drivers/reset/starfive/Makefile               |  1 +
 .../starfive/reset-starfive-jhb100-syscon.c   | 61 +++++++++++++++++++
 3 files changed, 71 insertions(+)
 create mode 100644 drivers/reset/starfive/reset-starfive-jhb100-syscon.c

diff --git a/drivers/reset/starfive/Kconfig b/drivers/reset/starfive/Kconfig
index 84baefbaee14..be948b855c79 100644
--- a/drivers/reset/starfive/Kconfig
+++ b/drivers/reset/starfive/Kconfig
@@ -28,3 +28,12 @@ config RESET_STARFIVE_JHB100
 	default ARCH_STARFIVE
 	help
 	  This enables the reset controller driver for the StarFive JHB100 SoC.
+
+config RESET_STARFIVE_JHB100_SYSCON
+	tristate "StarFive JHB100 SYSCON Reset Driver"
+	depends on ARCH_STARFIVE || COMPILE_TEST
+	select RESET_STARFIVE_JH71X0
+	default m if ARCH_STARFIVE
+	help
+	  This enables the SYSCON reset controller driver for the StarFive
+	  JHB100 SoC.
diff --git a/drivers/reset/starfive/Makefile b/drivers/reset/starfive/Makefile
index d781103355d3..f568938d0219 100644
--- a/drivers/reset/starfive/Makefile
+++ b/drivers/reset/starfive/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_RESET_STARFIVE_JH71X0)		+= reset-starfive-jh71x0.o
 obj-$(CONFIG_RESET_STARFIVE_JH7100)		+= reset-starfive-jh7100.o
 obj-$(CONFIG_RESET_STARFIVE_JH7110)		+= reset-starfive-jh7110.o
 obj-$(CONFIG_RESET_STARFIVE_JHB100)		+= reset-starfive-jhb100.o
+obj-$(CONFIG_RESET_STARFIVE_JHB100_SYSCON)	+= reset-starfive-jhb100-syscon.o
diff --git a/drivers/reset/starfive/reset-starfive-jhb100-syscon.c b/drivers/reset/starfive/reset-starfive-jhb100-syscon.c
new file mode 100644
index 000000000000..16b2333d27fe
--- /dev/null
+++ b/drivers/reset/starfive/reset-starfive-jhb100-syscon.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SYSCON Reset driver for the StarFive JHB100 SoC
+ *
+ * Copyright (C) 2025 StarFive Technology Co., Ltd.
+ */
+
+#include <dt-bindings/reset/starfive,jhb100-crg.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+
+#include "reset-starfive-jh71x0.h"
+
+static const struct jh71x0_reset_info jhb100_pcierp_info = {
+	.nr_resets = (JHB100_PCIERP_SYSCONRST_PE2RST_OUT + 1),
+	.assert_offset = 0x14c,
+	.status_offset = 0x14c,
+	.active_low = true,
+};
+
+static int jhb100_syscon_reset_probe(struct platform_device *pdev)
+{
+	const struct jh71x0_reset_info *info;
+	void __iomem *base;
+
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	info = device_get_match_data(&pdev->dev);
+	if (!info)
+		return -ENODEV;
+
+	return reset_starfive_jh71x0_register_with_info(&pdev->dev, pdev->dev.of_node,
+							base + info->assert_offset,
+							base + info->status_offset,
+							NULL, info, THIS_MODULE);
+}
+
+static const struct of_device_id jhb100_syscon_reset_dt_ids[] = {
+	{
+		.compatible = "starfive,jhb100-pcierp-syscon",
+		.data = &jhb100_pcierp_info,
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, jhb100_syscon_reset_dt_ids);
+
+static struct platform_driver jhb100_syscon_reset_driver = {
+	.probe = jhb100_syscon_reset_probe,
+	.driver = {
+		.name = "jhb100-syscon-reset",
+		.of_match_table = jhb100_syscon_reset_dt_ids,
+	},
+};
+module_platform_driver(jhb100_syscon_reset_driver);
+
+MODULE_AUTHOR("Changhuang Liang <changhuang.liang at starfivetech.com>");
+MODULE_DESCRIPTION("StarFive JHB100 SYSCON reset driver");
+MODULE_LICENSE("GPL");
-- 
2.25.1