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This library exports the standard reset control operations (assert, deassert, and status) to be utilized by other specific Realtek reset drivers. The implementation supports handling an optional write-enable bit required by certain Realtek reset controllers. Signed-off-by: Cheng-Yu Lee Co-developed-by: Yu-Chun Lin Signed-off-by: Yu-Chun Lin Reviewed-by: Philipp Zabel --- Changes in v15: - None. --- MAINTAINERS | 1 + drivers/reset/Kconfig | 1 + drivers/reset/Makefile | 1 + drivers/reset/realtek/Kconfig | 8 +++ drivers/reset/realtek/Makefile | 2 + drivers/reset/realtek/reset-rtk-common.c | 73 ++++++++++++++++++++++++ drivers/reset/realtek/reset-rtk-common.h | 29 ++++++++++ 7 files changed, 115 insertions(+) create mode 100644 drivers/reset/realtek/Kconfig create mode 100644 drivers/reset/realtek/Makefile create mode 100644 drivers/reset/realtek/reset-rtk-common.c create mode 100644 drivers/reset/realtek/reset-rtk-common.h diff --git a/MAINTAINERS b/MAINTAINERS index 4cd437266dd5..16c9ba043126 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -23030,6 +23030,7 @@ M: Cheng-Yu Lee M: Yu-Chun Lin S: Supported F: Documentation/devicetree/bindings/clock/realtek* +F: drivers/reset/realtek/* F: include/dt-bindings/clock/realtek* F: include/dt-bindings/reset/realtek* diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index eda9c698a95f..eda8f42954f2 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -452,6 +452,7 @@ config RESET_ZYNQMP source "drivers/reset/amlogic/Kconfig" source "drivers/reset/hisilicon/Kconfig" +source "drivers/reset/realtek/Kconfig" source "drivers/reset/spacemit/Kconfig" source "drivers/reset/starfive/Kconfig" source "drivers/reset/sti/Kconfig" diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 489fafd6bbe3..486a8d0048ac 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -2,6 +2,7 @@ obj-y += core.o obj-y += amlogic/ obj-y += hisilicon/ +obj-y += realtek/ obj-y += spacemit/ obj-y += starfive/ obj-y += sti/ diff --git a/drivers/reset/realtek/Kconfig b/drivers/reset/realtek/Kconfig new file mode 100644 index 000000000000..5ddf8e5c09c7 --- /dev/null +++ b/drivers/reset/realtek/Kconfig @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0-only +config RESET_RTK_COMMON + tristate "Realtek common reset driver" if COMPILE_TEST + help + This option enables the common reset controller library for + Realtek SoCs. It provides shared reset control operations + (assert, deassert, status) that other Realtek-specific reset + drivers can use. diff --git a/drivers/reset/realtek/Makefile b/drivers/reset/realtek/Makefile new file mode 100644 index 000000000000..6d68e41748bf --- /dev/null +++ b/drivers/reset/realtek/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_RESET_RTK_COMMON) += reset-rtk-common.o diff --git a/drivers/reset/realtek/reset-rtk-common.c b/drivers/reset/realtek/reset-rtk-common.c new file mode 100644 index 000000000000..6900932b0a32 --- /dev/null +++ b/drivers/reset/realtek/reset-rtk-common.c @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2019-2026 Realtek Semiconductor Corporation + */ + +#include +#include +#include +#include "reset-rtk-common.h" + +static inline struct rtk_reset_data *to_rtk_reset_controller(struct reset_controller_dev *r) +{ + return container_of(r, struct rtk_reset_data, rcdev); +} + +static inline const struct rtk_reset_desc *rtk_reset_get_desc(struct rtk_reset_data *data, + unsigned long idx) +{ + return &data->descs[idx]; +} + +static int rtk_reset_assert(struct reset_controller_dev *rcdev, + unsigned long idx) +{ + struct rtk_reset_data *data = to_rtk_reset_controller(rcdev); + const struct rtk_reset_desc *desc; + unsigned int mask, val; + + desc = rtk_reset_get_desc(data, idx); + mask = desc->write_en ? (0x3U << desc->bit) : BIT(desc->bit); + val = desc->write_en ? (0x2U << desc->bit) : 0; + + return regmap_update_bits(data->regmap, desc->ofs, mask, val); +} + +static int rtk_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long idx) +{ + struct rtk_reset_data *data = to_rtk_reset_controller(rcdev); + const struct rtk_reset_desc *desc; + unsigned int mask; + + desc = rtk_reset_get_desc(data, idx); + mask = desc->write_en ? (0x3U << desc->bit) : BIT(desc->bit); + + return regmap_set_bits(data->regmap, desc->ofs, mask); +} + +static int rtk_reset_status(struct reset_controller_dev *rcdev, + unsigned long idx) +{ + struct rtk_reset_data *data = to_rtk_reset_controller(rcdev); + const struct rtk_reset_desc *desc; + unsigned int val; + int ret; + + desc = rtk_reset_get_desc(data, idx); + ret = regmap_read(data->regmap, desc->ofs, &val); + if (ret) + return ret; + + return !((val >> desc->bit) & 1); +} + +const struct reset_control_ops rtk_reset_ops = { + .assert = rtk_reset_assert, + .deassert = rtk_reset_deassert, + .status = rtk_reset_status, +}; +EXPORT_SYMBOL_NS_GPL(rtk_reset_ops, "REALTEK_RESET"); + +MODULE_DESCRIPTION("realtek reset infrastructure"); +MODULE_LICENSE("GPL"); diff --git a/drivers/reset/realtek/reset-rtk-common.h b/drivers/reset/realtek/reset-rtk-common.h new file mode 100644 index 000000000000..3ea35d9573a4 --- /dev/null +++ b/drivers/reset/realtek/reset-rtk-common.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2026 Realtek Semiconductor Corporation + * Author: Yu-Chun Lin + */ + +#ifndef __RESET_REALTEK_COMMON_H +#define __RESET_REALTEK_COMMON_H + +#include +#include + +struct regmap; + +struct rtk_reset_desc { + u32 ofs; + u32 bit; + bool write_en; +}; + +struct rtk_reset_data { + struct reset_controller_dev rcdev; + const struct rtk_reset_desc *descs; + struct regmap *regmap; +}; + +extern const struct reset_control_ops rtk_reset_ops; + +#endif /* __RESET_REALTEK_COMMON_H */ -- 2.43.0