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Additionally, if the "#reset-cells" property is present in the device tree, it creates and registers an auxiliary device using the provided aux_name. This allows the dedicated reset driver to bind to this device, enabling both clock and reset drivers to share the same regmap. Signed-off-by: Cheng-Yu Lee Co-developed-by: Yu-Chun Lin Signed-off-by: Yu-Chun Lin Reviewed-by: Brian Masney --- MAINTAINERS | 1 + drivers/clk/Kconfig | 1 + drivers/clk/Makefile | 1 + drivers/clk/realtek/Kconfig | 29 ++++++++++ drivers/clk/realtek/Makefile | 4 ++ drivers/clk/realtek/clk-rtk-common.c | 84 ++++++++++++++++++++++++++++ drivers/clk/realtek/clk-rtk-common.h | 37 ++++++++++++ 7 files changed, 157 insertions(+) create mode 100644 drivers/clk/realtek/Kconfig create mode 100644 drivers/clk/realtek/Makefile create mode 100644 drivers/clk/realtek/clk-rtk-common.c create mode 100644 drivers/clk/realtek/clk-rtk-common.h diff --git a/MAINTAINERS b/MAINTAINERS index c51f9fc157c8..54873a33038b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -23541,6 +23541,7 @@ REALTEK CLOCK DRIVERS M: Cheng-Yu Lee M: Yu-Chun Lin S: Supported +F: drivers/clk/realtek/* F: include/dt-bindings/clock/realtek* REALTEK OTTO WATCHDOG diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 37a8e35d4178..eb9256459251 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -532,6 +532,7 @@ source "drivers/clk/nuvoton/Kconfig" source "drivers/clk/pistachio/Kconfig" source "drivers/clk/qcom/Kconfig" source "drivers/clk/ralink/Kconfig" +source "drivers/clk/realtek/Kconfig" source "drivers/clk/renesas/Kconfig" source "drivers/clk/rockchip/Kconfig" source "drivers/clk/samsung/Kconfig" diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 52d138d4ffc8..3930bf20667b 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -156,6 +156,7 @@ obj-$(CONFIG_COMMON_CLK_PISTACHIO) += pistachio/ obj-$(CONFIG_COMMON_CLK_PXA) += pxa/ obj-$(CONFIG_COMMON_CLK_QCOM) += qcom/ obj-y += ralink/ +obj-$(CONFIG_COMMON_CLK_REALTEK) += realtek/ obj-y += renesas/ obj-$(CONFIG_COMMON_CLK_ROCKCHIP) += rockchip/ obj-$(CONFIG_COMMON_CLK_SAMSUNG) += samsung/ diff --git a/drivers/clk/realtek/Kconfig b/drivers/clk/realtek/Kconfig new file mode 100644 index 000000000000..e8deccf93f94 --- /dev/null +++ b/drivers/clk/realtek/Kconfig @@ -0,0 +1,29 @@ +# SPDX-License-Identifier: GPL-2.0-only +config COMMON_CLK_REALTEK + tristate "Clock driver for Realtek SoCs" + depends on ARCH_REALTEK || COMPILE_TEST + default ARCH_REALTEK + help + Enable the common clock framework infrastructure for Realtek + system-on-chip platforms. + + This provides the base support required by individual Realtek + clock controller drivers to expose clocks to peripheral devices. + + If you have a Realtek-based platform, say Y. + +if COMMON_CLK_REALTEK + +config RTK_CLK_COMMON + tristate "Realtek Clock Common" + select AUXILIARY_BUS + select REGMAP_MMIO + help + Common helper code shared by Realtek clock controller drivers. + + This provides utility functions and data structures used by + multiple Realtek clock implementations. It also provides the + infrastructure to spawn reset controllers via the auxiliary bus + where required. + +endif diff --git a/drivers/clk/realtek/Makefile b/drivers/clk/realtek/Makefile new file mode 100644 index 000000000000..13000ed4ba11 --- /dev/null +++ b/drivers/clk/realtek/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_RTK_CLK_COMMON) += clk-rtk.o + +clk-rtk-y += clk-rtk-common.o diff --git a/drivers/clk/realtek/clk-rtk-common.c b/drivers/clk/realtek/clk-rtk-common.c new file mode 100644 index 000000000000..7df6d04bb95a --- /dev/null +++ b/drivers/clk/realtek/clk-rtk-common.c @@ -0,0 +1,84 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2019-2026 Realtek Semiconductor Corporation + * Author: Cheng-Yu Lee + */ + +#include +#include +#include +#include +#include +#include +#include "clk-rtk-common.h" + +static int rtk_reset_controller_register(struct device *dev, const char *aux_name, + struct regmap *map) +{ + struct auxiliary_device *adev; + + if (!of_property_present(dev->of_node, "#reset-cells")) + return 0; + + if (!aux_name) { + dev_err(dev, "DTS requires reset controller, but aux_name is missing\n"); + return -EINVAL; + } + + adev = devm_auxiliary_device_create(dev, aux_name, (void *)map); + if (!adev) + return -ENOMEM; + + return 0; +} + +static const struct regmap_config rtk_clk_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, +}; + +int rtk_clk_probe(struct platform_device *pdev, const struct rtk_clk_desc *desc) +{ + struct device *dev = &pdev->dev; + struct regmap *regmap; + void __iomem *base; + struct clk_hw *hw; + int i, ret; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + regmap = devm_regmap_init_mmio(dev, base, &rtk_clk_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + for (i = 0; i < desc->num_clks; i++) + desc->clks[i]->regmap = regmap; + + for (i = 0; i < desc->clk_data->num; i++) { + hw = desc->clk_data->hws[i]; + if (!hw) + continue; + + ret = devm_clk_hw_register(dev, hw); + if (ret) + return dev_err_probe(dev, ret, "failed to register hw of clk%d\n", i); + } + + ret = rtk_reset_controller_register(dev, desc->aux_name, regmap); + if (ret) + return dev_err_probe(dev, ret, "failed to register reset controller\n"); + + ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, + desc->clk_data); + if (ret) + return dev_err_probe(dev, ret, "failed to add clock provider\n"); + + return 0; +} +EXPORT_SYMBOL_NS_GPL(rtk_clk_probe, "CLK_REALTEK"); + +MODULE_DESCRIPTION("Realtek clock infrastructure"); +MODULE_LICENSE("GPL"); diff --git a/drivers/clk/realtek/clk-rtk-common.h b/drivers/clk/realtek/clk-rtk-common.h new file mode 100644 index 000000000000..de3f23120b53 --- /dev/null +++ b/drivers/clk/realtek/clk-rtk-common.h @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2016-2026 Realtek Semiconductor Corporation + * Author: Cheng-Yu Lee + */ + +#ifndef __CLK_REALTEK_COMMON_H +#define __CLK_REALTEK_COMMON_H + +#include + +#define __rtk_clk_regmap_hw(_p) ((_p)->hw) + +struct device; +struct platform_device; +struct regmap; + +struct rtk_clk_regmap { + struct clk_hw hw; + struct regmap *regmap; +}; + +struct rtk_clk_desc { + struct clk_hw_onecell_data *clk_data; + struct rtk_clk_regmap **clks; + size_t num_clks; + char *aux_name; +}; + +static inline struct rtk_clk_regmap *to_rtk_clk_regmap(struct clk_hw *hw) +{ + return container_of(hw, struct rtk_clk_regmap, hw); +} + +int rtk_clk_probe(struct platform_device *pdev, const struct rtk_clk_desc *desc); + +#endif /* __CLK_REALTEK_COMMON_H */ -- 2.43.0