[PATCH v1 21/22] reset: starfive: Add StarFive JHB100 reset driver

Changhuang Liang
2026-04-02T11:14:17Z

Add auxiliary reset driver to support StarFive JHB100 SoC.

Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
---
MAINTAINERS | 6 +
drivers/reset/starfive/Kconfig | 9 ++
drivers/reset/starfive/Makefile | 1 +
.../reset/starfive/reset-starfive-jhb100.c | 121 ++++++++++++++++++
4 files changed, 137 insertions(+)
create mode 100644 drivers/reset/starfive/reset-starfive-jhb100.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 3af9d79b7daf..4ddf8ba2e60d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -25319,6 +25319,12 @@ L: linux-riscv@lists.infradead.org
S: Maintained
F: arch/riscv/boot/dts/starfive/jhb100*

+STARFIVE JHB100 RESET CONTROLLER DRIVERS
+M: Changhuang Liang <changhuang.liang@starfivetech.com>
+S: Maintained
+F: drivers/reset/starfive/reset-starfive-jhb1*
+F: include/dt-bindings/reset/starfive,jhb1*.h
+
STATIC BRANCH/CALL
M: Peter Zijlstra <peterz@infradead.org>
M: Josh Poimboeuf <jpoimboe@kernel.org>
diff --git a/drivers/reset/starfive/Kconfig b/drivers/reset/starfive/Kconfig
index 29fbcf1a7d83..6f9a0f24f9b9 100644
--- a/drivers/reset/starfive/Kconfig
+++ b/drivers/reset/starfive/Kconfig
@@ -19,3 +19,12 @@ config RESET_STARFIVE_JH7110
default ARCH_STARFIVE
help
This enables the reset controller driver for the StarFive JH7110 SoC.
+
+config RESET_STARFIVE_JHB100
+ bool "StarFive JHB100 Reset Driver"
+ depends on CLK_STARFIVE_JHB100_SYS0
+ select AUXILIARY_BUS
+ select RESET_STARFIVE_COMMON
+ default ARCH_STARFIVE
+ help
+ This enables the reset controller driver for the StarFive JHB100 SoC.
diff --git a/drivers/reset/starfive/Makefile b/drivers/reset/starfive/Makefile
index 582e4c160bd4..217002302a9f 100644
--- a/drivers/reset/starfive/Makefile
+++ b/drivers/reset/starfive/Makefile
@@ -3,3 +3,4 @@ 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
diff --git a/drivers/reset/starfive/reset-starfive-jhb100.c b/drivers/reset/starfive/reset-starfive-jhb100.c
new file mode 100644
index 000000000000..ab5e0f2a684f
--- /dev/null
+++ b/drivers/reset/starfive/reset-starfive-jhb100.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Reset driver for the StarFive JHB110 SoC
+ *
+ * Copyright (C) 2024 StarFive Technology Co., Ltd.
+ */
+
+#include <dt-bindings/reset/starfive,jhb100-crg.h>
+#include <linux/auxiliary_bus.h>
+#include <soc/starfive/reset-starfive-common.h>
+
+#include "reset-starfive-common.h"
+
+#define NUM_RESETS(x) ((x) + 1)
+
+struct jhb100_reset_info {
+ unsigned int nr_resets;
+ unsigned int assert_offset;
+ unsigned int status_offset;
+};
+
+static const struct jhb100_reset_info jhb100_sys0_info = {
+ .nr_resets = NUM_RESETS(JHB100_SYS0RST_BMCUSB_RSTN_CRG),
+ .assert_offset = 0x12c,
+ .status_offset = 0x130,
+};
+
+static const struct jhb100_reset_info jhb100_sys1_info = {
+ .nr_resets = NUM_RESETS(JHB100_SYS1RST_BMCPERIPH3_RSTN_BUS),
+ .assert_offset = 0x54,
+ .status_offset = 0x58,
+};
+
+static const struct jhb100_reset_info jhb100_sys2_info = {
+ .nr_resets = NUM_RESETS(JHB100_SYS2RST_GPU1_HOST_PCIE_RST_N),
+ .assert_offset = 0x88,
+ .status_offset = 0x8c,
+};
+
+static const struct jhb100_reset_info jhb100_periph0_info = {
+ .nr_resets = NUM_RESETS(JHB100_PER0RST_UART_MUX_REG_WRAP),
+ .assert_offset = 0x554,
+ .status_offset = 0x560,
+};
+
+static const struct jhb100_reset_info jhb100_periph1_info = {
+ .nr_resets = NUM_RESETS(JHB100_PER1RST_MAIN_RSTN_PERIPH1_RAS),
+ .assert_offset = 0x134,
+ .status_offset = 0x138,
+};
+
+static const struct jhb100_reset_info jhb100_periph2_info = {
+ .nr_resets = NUM_RESETS(JHB100_PER2RST_MAIN_RSTN_PERIPH2_SENSORS),
+ .assert_offset = 0x11c,
+ .status_offset = 0x120,
+};
+
+static const struct jhb100_reset_info jhb100_periph3_info = {
+ .nr_resets = NUM_RESETS(JHB100_PER3RST_IOMUX_PRESETN),
+ .assert_offset = 0x98,
+ .status_offset = 0x9c,
+};
+
+static int jhb100_reset_probe(struct auxiliary_device *adev,
+ const struct auxiliary_device_id *id)
+{
+ struct jhb100_reset_info *info = (struct jhb100_reset_info *)(id->driver_data);
+ struct starfive_reset_adev *rdev = to_starfive_reset_adev(adev);
+ void __iomem *base = rdev->base;
+
+ if (!info || !base)
+ return -ENODEV;
+
+ return reset_starfive_register(&adev->dev, adev->dev.parent->of_node,
+ base + info->assert_offset,
+ base + info->status_offset,
+ NULL, info->nr_resets, NULL);
+}
+
+static const struct auxiliary_device_id jhb100_reset_ids[] = {
+ {
+ .name = "clk_starfive_jhb100_sys0.r-sys0",
+ .driver_data = (kernel_ulong_t)&jhb100_sys0_info,
+ },
+ {
+ .name = "clk_starfive_jhb100_sys0.r-sys1",
+ .driver_data = (kernel_ulong_t)&jhb100_sys1_info,
+ },
+ {
+ .name = "clk_starfive_jhb100_sys0.r-sys2",
+ .driver_data = (kernel_ulong_t)&jhb100_sys2_info,
+ },
+ {
+ .name = "clk_starfive_jhb100_sys0.r-per0",
+ .driver_data = (kernel_ulong_t)&jhb100_periph0_info,
+ },
+ {
+ .name = "clk_starfive_jhb100_sys0.r-per1",
+ .driver_data = (kernel_ulong_t)&jhb100_periph1_info,
+ },
+ {
+ .name = "clk_starfive_jhb100_sys0.r-per2",
+ .driver_data = (kernel_ulong_t)&jhb100_periph2_info,
+ },
+ {
+ .name = "clk_starfive_jhb100_sys0.r-per3",
+ .driver_data = (kernel_ulong_t)&jhb100_periph3_info,
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(auxiliary, jhb100_reset_ids);
+
+static struct auxiliary_driver jhb100_reset_driver = {
+ .probe = jhb100_reset_probe,
+ .id_table = jhb100_reset_ids,
+};
+module_auxiliary_driver(jhb100_reset_driver);
+
+MODULE_AUTHOR("Changhuang Liang <changhuang.liang@starfivetech.com>");
+MODULE_DESCRIPTION("StarFive JHB100 reset driver");
+MODULE_LICENSE("GPL");
--
2.25.1