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[82.67.6.57]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-486eb36e4a6sm35902151f8f.37.2026.09.15.05.26.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Sep 2026 05:26:24 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Subject: Re: [PATCH v14 04/11] clk: realtek: Introduce common probe() From: Jerome Brunet To: Yu-Chun Lin Cc: sboyd@kernel.org, bmasney+clk@redhat.com, jbrunet+clk@baylibre.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, p.zabel@pengutronix.de, cylee12@realtek.com, afaerber@suse.com, jyanchou@realtek.com, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-realtek-soc@lists.infradead.org, james.tai@realtek.com, cy.huang@realtek.com, stanley_chang@realtek.com, Brian Masney In-Reply-To: <20260901072446.2563145-5-eleanor.lin@realtek.com> References: <20260901072446.2563145-1-eleanor.lin@realtek.com> <20260901072446.2563145-5-eleanor.lin@realtek.com> Date: Tue, 15 Sep 2026 14:26:17 +0200 Message-Id: <178947517742.448573.7975580808033616494.b4-reply@b4> X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; 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a=openpgp; fpr=F29F26CF27BAE1A9719AE6BDC3C92AAF3E60AED9 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260915_132628_905607_A212F0F6 X-CRM114-Status: GOOD ( 35.31 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2026-09-01 15:24 +0800, Yu-Chun Lin wrote: > From: Cheng-Yu Lee > > Add rtk_clk_probe() to set up the shared regmap, register clock hardware, > and add the clock provider. > > 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 > Reviewed-by: Brian Masney > Signed-off-by: Yu-Chun Lin > --- > Changes in v14: > - Move Reviewed-by tags to the correct position. > - Use devm_platform_ioremap_resource() + devm_regmap_init_mmio() instead > of device_node_to_regmap(). > - Drop rtk_clk_remove(). > --- > MAINTAINERS | 1 + > drivers/clk/Kconfig | 1 + > drivers/clk/Makefile | 1 + > drivers/clk/realtek/Kconfig | 30 ++++++++++ > drivers/clk/realtek/Makefile | 4 ++ > drivers/clk/realtek/clk-rtk-common.c | 82 ++++++++++++++++++++++++++++ > drivers/clk/realtek/clk-rtk-common.h | 37 +++++++++++++ > 7 files changed, 156 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 a752551f32f9..e55eb1c06119 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -22746,6 +22746,7 @@ M: Cheng-Yu Lee > M: Yu-Chun Lin > S: Supported > F: Documentation/devicetree/bindings/clock/realtek* > +F: drivers/clk/realtek/* > F: drivers/reset/realtek/* > F: include/dt-bindings/clock/realtek* > F: include/dt-bindings/reset/realtek* > diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig > index 1717ce75a907..97ad817457db 100644 > --- a/drivers/clk/Kconfig > +++ b/drivers/clk/Kconfig > @@ -525,6 +525,7 @@ 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 cc108a75a900..b1aa373e9f84 100644 > --- a/drivers/clk/Makefile > +++ b/drivers/clk/Makefile > @@ -141,6 +141,7 @@ 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..778f5b4a967a > --- /dev/null > +++ b/drivers/clk/realtek/Kconfig > @@ -0,0 +1,30 @@ > +# 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" > + depends on RESET_CONTROLLER > + select AUXILIARY_BUS > + select REGMAP_MMIO > + select RESET_RTK_COMMON Is there compile time dependency with reset that I missed ? The point of the aux bus is to remove such dep > + help > + Common helper code shared by Realtek clock controller drivers. > + > + This provides utility functions and data structures used by > + multiple Realtek clock implementations, and include integration > + with reset controllers 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..493f2d5588d0 > --- /dev/null > +++ b/drivers/clk/realtek/clk-rtk-common.c > @@ -0,0 +1,82 @@ > +// 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 = 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"); > + > + platform_set_drvdata(pdev, (void *)desc); > + > + return rtk_reset_controller_register(dev, desc->aux_name, regmap); sashiko report on Patch 10 is actually not a prexisting issue. it is here. Could you address it ? > +} > +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 > >