[PATCH v2 3/3] reset: eswin: Add eic7700 HSP reset driver

dongxuyang
2026-04-20T09:48:23Z

Add auxiliary driver to support ESWIN EIC7700 high-speed peripherals
system. The reset controller is created using the auxiliary device
framework and set up in the clock driver.

Signed-off-by: Xuyang Dong <dongxuyang@eswincomputing.com>
---
drivers/reset/Kconfig | 11 +++
drivers/reset/Makefile | 1 +
drivers/reset/reset-eic7700-hsp.c | 118 ++++++++++++++++++++++++++++++
3 files changed, 130 insertions(+)
create mode 100644 drivers/reset/reset-eic7700-hsp.c

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index d009eb0849a3..f63e89ed6a4e 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -83,6 +83,17 @@ config RESET_EIC7700
The driver supports eic7700 series chips and provides functionality for
asserting and deasserting resets on the chip.

+config RESET_EIC7700_HSP
+ tristate "EIC7700 HSP Reset controller"
+ depends on ARCH_ESWIN || COMPILE_TEST
+ select AUXILIARY_BUS
+ help
+ This enables the HSP reset controller driver for ESWIN SoCs. This
+ driver is specific to ESWIN SoCs and should only be enabled if using
+ such hardware.
+ The driver supports EIC7700 series chips and provides functionality
+ for asserting and deasserting resets on the chip.
+
config RESET_EYEQ
bool "Mobileye EyeQ reset controller"
depends on EYEQ || COMPILE_TEST
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 3e52569bd276..a75af831ef58 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o
obj-$(CONFIG_RESET_BRCMSTB) += reset-brcmstb.o
obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o
obj-$(CONFIG_RESET_EIC7700) += reset-eic7700.o
+obj-$(CONFIG_RESET_EIC7700_HSP) += reset-eic7700-hsp.o
obj-$(CONFIG_RESET_EYEQ) += reset-eyeq.o
obj-$(CONFIG_RESET_GPIO) += reset-gpio.o
obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o
diff --git a/drivers/reset/reset-eic7700-hsp.c b/drivers/reset/reset-eic7700-hsp.c
new file mode 100644
index 000000000000..dde1f9bffa61
--- /dev/null
+++ b/drivers/reset/reset-eic7700-hsp.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2026, Beijing ESWIN Computing Technology Co., Ltd..
+ * All rights reserved.
+ *
+ * ESWIN EIC7700 HSP Reset Driver
+ *
+ * Authors: Xuyang Dong <dongxuyang@eswincomputing.com>
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+#include <linux/reset-controller.h>
+
+#include <dt-bindings/reset/eswin,eic7700-hspcrg.h>
+
+/**
+ * struct eic7700_hsp_reset_data - reset controller information structure
+ * @rcdev: reset controller entity
+ * @regmap: regmap handle containing the memory-mapped reset registers
+ */
+struct eic7700_hsp_reset_data {
+ struct reset_controller_dev rcdev;
+ struct regmap *regmap;
+};
+
+struct eic7700_hsp_reg {
+ u32 reg;
+ u32 bit;
+ bool active_low;
+};
+
+static inline struct eic7700_hsp_reset_data *
+to_eic7700_hsp_reset(struct reset_controller_dev *rcdev)
+{
+ return container_of(rcdev, struct eic7700_hsp_reset_data, rcdev);
+}
+
+static const struct eic7700_hsp_reg eic7700_hsp_reset[] = {
+ [EIC7700_HSP_RST_SATA_P0] = {0x340, BIT(0), false},
+ [EIC7700_HSP_RST_SATA_PHY] = {0x340, BIT(1), false},
+ [EIC7700_HSP_RST_USB0] = {0x800, BIT(24), true},
+ [EIC7700_HSP_RST_USB1] = {0x900, BIT(24), true},
+ [EIC7700_HSP_RST_USB0_PHY] = {0x800, BIT(25), false},
+ [EIC7700_HSP_RST_USB1_PHY] = {0x900, BIT(25), false},
+};
+
+static int eic7700_hsp_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct eic7700_hsp_reset_data *data = to_eic7700_hsp_reset(rcdev);
+ int ret;
+
+ ret = regmap_assign_bits(data->regmap, eic7700_hsp_reset[id].reg,
+ eic7700_hsp_reset[id].bit,
+ !eic7700_hsp_reset[id].active_low);
+
+ return ret;
+}
+
+static int eic7700_hsp_reset_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct eic7700_hsp_reset_data *data = to_eic7700_hsp_reset(rcdev);
+ int ret;
+
+ ret = regmap_assign_bits(data->regmap, eic7700_hsp_reset[id].reg,
+ eic7700_hsp_reset[id].bit,
+ eic7700_hsp_reset[id].active_low);
+
+ return ret;
+}
+
+static const struct reset_control_ops eic7700_hsp_reset_ops = {
+ .assert = eic7700_hsp_reset_assert,
+ .deassert = eic7700_hsp_reset_deassert,
+};
+
+static int eic7700_hsp_reset_probe(struct auxiliary_device *adev,
+ const struct auxiliary_device_id *id)
+{
+ struct eic7700_hsp_reset_data *data;
+ struct device *dev = &adev->dev;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->regmap = dev_get_regmap(dev->parent, NULL);
+ if (!data->regmap)
+ return dev_err_probe(dev, -EINVAL, "failed to get regmap!\n");
+
+ data->rcdev.owner = THIS_MODULE;
+ data->rcdev.ops = &eic7700_hsp_reset_ops;
+ data->rcdev.of_node = dev->parent->of_node;
+ data->rcdev.dev = dev;
+ data->rcdev.nr_resets = ARRAY_SIZE(eic7700_hsp_reset);
+
+ return devm_reset_controller_register(dev, &data->rcdev);
+}
+
+static const struct auxiliary_device_id eic7700_hsp_reset_dt_ids[] = {
+ { .name = "clk_eic7700_hsp.hsp-reset", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(auxiliary, eic7700_hsp_reset_dt_ids);
+
+static struct auxiliary_driver eic7700_hsp_reset_driver = {
+ .probe = eic7700_hsp_reset_probe,
+ .id_table = eic7700_hsp_reset_dt_ids,
+};
+
+module_auxiliary_driver(eic7700_hsp_reset_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Xuyang Dong <dongxuyang@eswincomputing.com>");
+MODULE_DESCRIPTION("ESWIN EIC7700 HSP Reset Controller Driver");
--
2.43.0