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Fri, 17 Oct 2025 04:21:50 -0700 (PDT) From: Laurentiu Mihalcea To: Abel Vesa , Peng Fan , Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Fabio Estevam , Philipp Zabel , Daniel Baluta , Shengjiu Wang Cc: linux-clk@vger.kernel.org, imx@lists.linux.dev, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Pengutronix Kernel Team Subject: [PATCH v2 3/8] clk: imx: add driver for imx8ulp's sim lpav Date: Fri, 17 Oct 2025 04:20:20 -0700 Message-ID: <20251017112025.11997-4-laurentiumihalcea111@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251017112025.11997-1-laurentiumihalcea111@gmail.com> References: <20251017112025.11997-1-laurentiumihalcea111@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Laurentiu Mihalcea The i.MX8ULP System Integration Module (SIM) LPAV module is a block control module found inside the LPAV subsystem, which offers some clock gating options and reset line assertion/de-assertion capabilities. Therefore, the clock gate management is supported by registering the module's driver as a clock provider, while the reset capabilities are managed via the auxiliary device API to allow the DT node to act as a reset and clock provider. Signed-off-by: Laurentiu Mihalcea --- drivers/clk/imx/Makefile | 1 + drivers/clk/imx/clk-imx8ulp-sim-lpav.c | 211 +++++++++++++++++++++++++ 2 files changed, 212 insertions(+) create mode 100644 drivers/clk/imx/clk-imx8ulp-sim-lpav.c diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile index 03f2b2a1ab63..208b46873a18 100644 --- a/drivers/clk/imx/Makefile +++ b/drivers/clk/imx/Makefile @@ -41,6 +41,7 @@ clk-imx-lpcg-scu-$(CONFIG_CLK_IMX8QXP) +=3D clk-lpcg-scu.= o clk-imx8qxp-lpcg.o clk-imx-acm-$(CONFIG_CLK_IMX8QXP) =3D clk-imx8-acm.o =20 obj-$(CONFIG_CLK_IMX8ULP) +=3D clk-imx8ulp.o +obj-$(CONFIG_CLK_IMX8ULP) +=3D clk-imx8ulp-sim-lpav.o =20 obj-$(CONFIG_CLK_IMX1) +=3D clk-imx1.o obj-$(CONFIG_CLK_IMX25) +=3D clk-imx25.o diff --git a/drivers/clk/imx/clk-imx8ulp-sim-lpav.c b/drivers/clk/imx/clk-i= mx8ulp-sim-lpav.c new file mode 100644 index 000000000000..a67a0e50e1ce --- /dev/null +++ b/drivers/clk/imx/clk-imx8ulp-sim-lpav.c @@ -0,0 +1,211 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2025 NXP + */ + +#include + +#include +#include +#include +#include +#include +#include +#include + +#define SYSCTRL0 0x8 + +#define IMX8ULP_HIFI_CLK_GATE(gname, cname, pname, bidx) \ + { \ + .name =3D gname "_cg", \ + .id =3D IMX8ULP_CLK_SIM_LPAV_HIFI_##cname, \ + .parent =3D { .fw_name =3D pname, .name =3D pname }, \ + .bit =3D bidx, \ + } + +struct clk_imx8ulp_sim_lpav_data { + void __iomem *base; + struct regmap *regmap; + spinlock_t lock; /* shared by MUX, clock gate and reset */ + unsigned long flags; /* for spinlock usage */ + struct clk_hw_onecell_data clk_data; /* keep last */ +}; + +struct clk_imx8ulp_sim_lpav_gate { + const char *name; + int id; + const struct clk_parent_data parent; + u8 bit; +}; + +static struct clk_imx8ulp_sim_lpav_gate gates[] =3D { + IMX8ULP_HIFI_CLK_GATE("hifi_core", CORE, "hifi_core", 17), + IMX8ULP_HIFI_CLK_GATE("hifi_pbclk", PBCLK, "lpav_bus", 18), + IMX8ULP_HIFI_CLK_GATE("hifi_plat", PLAT, "hifi_plat", 19) +}; + +#ifdef CONFIG_RESET_CONTROLLER +static void clk_imx8ulp_sim_lpav_aux_reset_release(struct device *dev) +{ + struct auxiliary_device *adev =3D to_auxiliary_dev(dev); + + kfree(adev); +} + +static void clk_imx8ulp_sim_lpav_unregister_aux_reset(void *data) +{ + struct auxiliary_device *adev =3D data; + + auxiliary_device_delete(adev); + auxiliary_device_uninit(adev); +} + +static int clk_imx8ulp_sim_lpav_register_aux_reset(struct platform_device = *pdev) +{ + struct auxiliary_device *adev __free(kfree) =3D NULL; + int ret; + + adev =3D kzalloc(sizeof(*adev), GFP_KERNEL); + if (!adev) + return -ENOMEM; + + adev->name =3D "reset"; + adev->dev.parent =3D &pdev->dev; + adev->dev.release =3D clk_imx8ulp_sim_lpav_aux_reset_release; + + ret =3D auxiliary_device_init(adev); + if (ret) { + dev_err(&pdev->dev, "failed to initialize aux dev\n"); + return ret; + } + + ret =3D auxiliary_device_add(adev); + if (ret) { + auxiliary_device_uninit(adev); + dev_err(&pdev->dev, "failed to add aux dev\n"); + return ret; + } + + return devm_add_action_or_reset(&pdev->dev, + clk_imx8ulp_sim_lpav_unregister_aux_reset, + no_free_ptr(adev)); +} +#else +static int clk_imx8ulp_sim_lpav_register_aux_reset(struct platform_device = *pdev) +{ + return 0; +} +#endif /* CONFIG_RESET_CONTROLLER */ + +static void clk_imx8ulp_sim_lpav_lock(void *arg) __acquires(&data->lock) +{ + struct clk_imx8ulp_sim_lpav_data *data =3D dev_get_drvdata(arg); + + spin_lock_irqsave(&data->lock, data->flags); +} + +static void clk_imx8ulp_sim_lpav_unlock(void *arg) __releases(&data->lock) +{ + struct clk_imx8ulp_sim_lpav_data *data =3D dev_get_drvdata(arg); + + spin_unlock_irqrestore(&data->lock, data->flags); +} + +static const struct regmap_config clk_imx8ulp_sim_lpav_regmap_cfg =3D { + .reg_bits =3D 32, + .val_bits =3D 32, + .reg_stride =3D 4, + .lock =3D clk_imx8ulp_sim_lpav_lock, + .unlock =3D clk_imx8ulp_sim_lpav_unlock, +}; + +static int clk_imx8ulp_sim_lpav_probe(struct platform_device *pdev) +{ + struct clk_imx8ulp_sim_lpav_data *data; + struct regmap_config regmap_config; + struct clk_hw *hw; + int i, ret; + + data =3D devm_kzalloc(&pdev->dev, + struct_size(data, clk_data.hws, ARRAY_SIZE(gates)), + GFP_KERNEL); + if (!data) + return -ENOMEM; + + dev_set_drvdata(&pdev->dev, data); + + memcpy(®map_config, &clk_imx8ulp_sim_lpav_regmap_cfg, sizeof(regmap_co= nfig)); + regmap_config.lock_arg =3D &pdev->dev; + + /* + * this lock is used directly by the clock gate and indirectly + * by the reset and mux controller via the regmap API + */ + spin_lock_init(&data->lock); + + data->base =3D devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(data->base)) + return dev_err_probe(&pdev->dev, PTR_ERR(data->base), + "failed to ioremap base\n"); + /* + * although the clock gate doesn't use the regmap API to modify the + * registers, we still need the regmap because of the reset auxiliary + * driver and the MUX drivers, which use the parent device's regmap + */ + data->regmap =3D devm_regmap_init_mmio(&pdev->dev, data->base, ®map_co= nfig); + if (IS_ERR(data->regmap)) + return dev_err_probe(&pdev->dev, PTR_ERR(data->regmap), + "failed to initialize regmap\n"); + + data->clk_data.num =3D ARRAY_SIZE(gates); + + for (i =3D 0; i < ARRAY_SIZE(gates); i++) { + hw =3D devm_clk_hw_register_gate_parent_data(&pdev->dev, + gates[i].name, + &gates[i].parent, + CLK_SET_RATE_PARENT, + data->base + SYSCTRL0, + gates[i].bit, + 0x0, &data->lock); + if (IS_ERR(hw)) + return dev_err_probe(&pdev->dev, PTR_ERR(hw), + "failed to register %s gate\n", + gates[i].name); + + data->clk_data.hws[i] =3D hw; + } + + ret =3D clk_imx8ulp_sim_lpav_register_aux_reset(pdev); + if (ret) + return dev_err_probe(&pdev->dev, ret, + "failed to register aux reset\n"); + + ret =3D devm_of_clk_add_hw_provider(&pdev->dev, + of_clk_hw_onecell_get, + &data->clk_data); + if (ret) + return dev_err_probe(&pdev->dev, ret, + "failed to register clk hw provider\n"); + + /* used to probe MUX child device */ + return devm_of_platform_populate(&pdev->dev); +} + +static const struct of_device_id clk_imx8ulp_sim_lpav_of_match[] =3D { + { .compatible =3D "fsl,imx8ulp-sim-lpav" }, + { } +}; +MODULE_DEVICE_TABLE(of, clk_imx8ulp_sim_lpav_of_match); + +static struct platform_driver clk_imx8ulp_sim_lpav_driver =3D { + .probe =3D clk_imx8ulp_sim_lpav_probe, + .driver =3D { + .name =3D "clk-imx8ulp-sim-lpav", + .of_match_table =3D clk_imx8ulp_sim_lpav_of_match, + }, +}; +module_platform_driver(clk_imx8ulp_sim_lpav_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("i.MX8ULP LPAV System Integration Module (SIM) clock dr= iver"); +MODULE_AUTHOR("Laurentiu Mihalcea "); --=20 2.43.0