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

Changhuang Liang
2026-04-03T05:50:19Z

Add syscon reset driver for JHB100 SoC.

Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
---
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@starfivetech.com>");
+MODULE_DESCRIPTION("StarFive JHB100 SYSCON reset driver");
+MODULE_LICENSE("GPL");
--
2.25.1