[PATCH v1 10/13] reset: starfive: Add syscon reset driver support

[Changhuang Liang]

Add syscon reset driver for JHB100 SoC.

Signed-off-by: Changhuang Liang <changhuang.liang@xxxxxxxxxxxxxxxx>
---
 drivers/reset/starfive/Kconfig                |  9 ++++
 drivers/reset/starfive/Makefile               |  1 +
 .../starfive/reset-starfive-jhb100-syscon.c   | 48 +++++++++++++++++++
 3 files changed, 58 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 6f9a0f24f9b9..cd5ae9cad9d9 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
+	bool "StarFive JHB100 SYSCON Reset Driver"
+	depends on ARCH_STARFIVE || COMPILE_TEST
+	select RESET_STARFIVE_COMMON
+	default 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 217002302a9f..d5033d723167 100644
--- a/drivers/reset/starfive/Makefile
+++ b/drivers/reset/starfive/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_RESET_STARFIVE_COMMON)		+= reset-starfive-common.o
 obj-$(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..8de6419615c2
--- /dev/null
+++ b/drivers/reset/starfive/reset-starfive-jhb100-syscon.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SYSCON Reset driver for the StarFive JHB110 SoC
+ *
+ * Copyright (C) 2025 StarFive Technology Co., Ltd.
+ */
+
+#include <dt-bindings/reset/starfive,jhb100-crg.h>
+#include <linux/platform_device.h>
+#include <soc/starfive/reset-starfive-common.h>
+
+#include "reset-starfive-common.h"
+
+#define JHB100_PCIERP_SYSCON_RESET_ASSERT0	0x00
+
+static int jhb100_syscon_reset_probe(struct platform_device *pdev)
+{
+	void __iomem *base = devm_platform_ioremap_resource(pdev, 0);
+
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	return reset_starfive_register_polarity(&pdev->dev, pdev->dev.of_node,
+						base + JHB100_PCIERP_SYSCON_RESET_ASSERT0,
+						base + JHB100_PCIERP_SYSCON_RESET_ASSERT0,
+						NULL,
+						JHB100_PCIERP_SYSCONRST_PE2RST_OUT + 1,
+						NULL);
+}
+
+static const struct of_device_id jhb100_syscon_reset_dt_ids[] = {
+	{ .compatible = "starfive,jhb100-reset-pcierp" },
+	{ /* 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@xxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("StarFive JHB100 SYSCON reset driver");
+MODULE_LICENSE("GPL");
-- 
2.25.1