[PATCH 07/19] clk: amlogic: Add A4 PLL clock controller driver
From: Chuan Liu via B4 Relay <devnull+chuan.liu.amlogic.com@kernel.org>
Date: 2025-09-30 09:37:31
Also in:
b4-sent, linux-amlogic, linux-clk, linux-devicetree, lkml
Subsystem:
arm/amlogic meson soc clock framework, common clk framework, the rest · Maintainers:
Neil Armstrong, Jerome Brunet, Michael Turquette, Stephen Boyd, Linus Torvalds
From: Chuan Liu <redacted> Add the PLL clock controller driver for the Amlogic A4 SoC family. Signed-off-by: Chuan Liu <redacted> --- drivers/clk/meson/Kconfig | 13 +++ drivers/clk/meson/Makefile | 1 + drivers/clk/meson/a4-pll.c | 242 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 256 insertions(+)
diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig
index 71481607a6d5..2339abfa2c4e 100644
--- a/drivers/clk/meson/Kconfig
+++ b/drivers/clk/meson/Kconfig@@ -132,6 +132,19 @@ config COMMON_CLK_A1_PERIPHERALS device, A1 SoC Family. Say Y if you want A1 Peripherals clock controller to work. +config COMMON_CLK_A4_PLL + tristate "Amlogic A4 PLL clock controller" + depends on ARM64 + default ARCH_MESON + select COMMON_CLK_MESON_REGMAP + select COMMON_CLK_MESON_PLL + select COMMON_CLK_MESON_CLKC_UTILS + imply COMMON_CLK_SCMI + help + Support for the PLL clock controller on Amlogic BA40X device, AKA A4. + Say Y if you want the board to work, because PLLs are the parent + of most peripherals. + config COMMON_CLK_C3_PLL tristate "Amlogic C3 PLL clock controller" depends on ARM64
diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
index c6998e752c68..22312393663f 100644
--- a/drivers/clk/meson/Makefile
+++ b/drivers/clk/meson/Makefile@@ -19,6 +19,7 @@ obj-$(CONFIG_COMMON_CLK_AXG) += axg.o axg-aoclk.o obj-$(CONFIG_COMMON_CLK_AXG_AUDIO) += axg-audio.o obj-$(CONFIG_COMMON_CLK_A1_PLL) += a1-pll.o obj-$(CONFIG_COMMON_CLK_A1_PERIPHERALS) += a1-peripherals.o +obj-$(CONFIG_COMMON_CLK_A4_PLL) += a4-pll.o obj-$(CONFIG_COMMON_CLK_C3_PLL) += c3-pll.o obj-$(CONFIG_COMMON_CLK_C3_PERIPHERALS) += c3-peripherals.o obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o
diff --git a/drivers/clk/meson/a4-pll.c b/drivers/clk/meson/a4-pll.c
new file mode 100644
index 000000000000..b77d4f610843
--- /dev/null
+++ b/drivers/clk/meson/a4-pll.c@@ -0,0 +1,242 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Amlogic A4 PLL Controller Driver + * + * Copyright (c) 2025 Amlogic, inc. + * Author: Chuan Liu <chuan.liu@amlogic.com> + */ + +#include <linux/clk-provider.h> +#include <linux/platform_device.h> +#include "clk-regmap.h" +#include "clk-pll.h" +#include "meson-clkc-utils.h" +#include <dt-bindings/clock/amlogic,a4-pll-clkc.h> + +#define GP0PLL_CTRL0 0x80 +#define GP0PLL_CTRL1 0x84 +#define GP0PLL_CTRL2 0x88 +#define GP0PLL_CTRL3 0x8c +#define HIFIPLL_CTRL0 0x100 +#define HIFIPLL_CTRL1 0x104 +#define HIFIPLL_CTRL2 0x108 +#define HIFIPLL_CTRL3 0x10c + +static const struct reg_sequence a4_gp0_init_regs[] = { + { .reg = GP0PLL_CTRL1, .def = 0x03a00000 }, + { .reg = GP0PLL_CTRL2, .def = 0x00040000 }, + { .reg = GP0PLL_CTRL3, .def = 0x090da200 } +}; + +static const struct pll_mult_range a4_gp0_pll_mult_range = { + .min = 67, + .max = 133, +}; + +static struct clk_regmap a4_gp0_pll_dco = { + .data = &(struct meson_clk_pll_data) { + .en = { + .reg_off = GP0PLL_CTRL0, + .shift = 28, + .width = 1, + }, + .m = { + .reg_off = GP0PLL_CTRL0, + .shift = 0, + .width = 9, + }, + .frac = { + .reg_off = GP0PLL_CTRL1, + .shift = 0, + .width = 17, + }, + .n = { + .reg_off = GP0PLL_CTRL0, + .shift = 16, + .width = 5, + }, + .l = { + .reg_off = GP0PLL_CTRL0, + .shift = 31, + .width = 1, + }, + .rst = { + .reg_off = GP0PLL_CTRL0, + .shift = 29, + .width = 1, + }, + .l_detect = { + .reg_off = GP0PLL_CTRL3, + .shift = 9, + .width = 1, + }, + .range = &a4_gp0_pll_mult_range, + .init_regs = a4_gp0_init_regs, + .init_count = ARRAY_SIZE(a4_gp0_init_regs), + }, + .hw.init = &(struct clk_init_data) { + .name = "gp0_pll_dco", + .ops = &meson_clk_pll_ops, + .parent_data = &(const struct clk_parent_data) { + .fw_name = "xtal", + }, + .num_parents = 1, + }, +}; + +/* The maximum frequency divider supports is 16, not 128(2^7) */ +static const struct clk_div_table a4_gp0_pll_od_table[] = { + { 0, 1 }, + { 1, 2 }, + { 2, 4 }, + { 3, 8 }, + { 4, 16 }, + { /* sentinel */ } +}; + +static struct clk_regmap a4_gp0_pll = { + .data = &(struct clk_regmap_div_data) { + .offset = GP0PLL_CTRL0, + .shift = 10, + .width = 3, + .table = a4_gp0_pll_od_table, + }, + .hw.init = &(struct clk_init_data) { + .name = "gp0_pll", + .ops = &clk_regmap_divider_ops, + .parent_hws = (const struct clk_hw *[]) { + &a4_gp0_pll_dco.hw + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT, + }, +}; + +static const struct reg_sequence a4_hifi_init_regs[] = { + { .reg = HIFIPLL_CTRL1, .def = 0x03a00000 }, + { .reg = HIFIPLL_CTRL2, .def = 0x00040000 }, + { .reg = HIFIPLL_CTRL3, .def = 0x0a0da200 } +}; + +static const struct pll_mult_range a4_hifi_pll_mult_range = { + .min = 67, + .max = 133, +}; + +static struct clk_regmap a4_hifi_pll_dco = { + .data = &(struct meson_clk_pll_data) { + .en = { + .reg_off = HIFIPLL_CTRL0, + .shift = 28, + .width = 1, + }, + .m = { + .reg_off = HIFIPLL_CTRL0, + .shift = 0, + .width = 8, + }, + .frac = { + .reg_off = HIFIPLL_CTRL1, + .shift = 0, + .width = 17, + }, + .n = { + .reg_off = HIFIPLL_CTRL0, + .shift = 16, + .width = 5, + }, + .l = { + .reg_off = HIFIPLL_CTRL0, + .shift = 31, + .width = 1, + }, + .rst = { + .reg_off = HIFIPLL_CTRL0, + .shift = 29, + .width = 1, + }, + .l_detect = { + .reg_off = HIFIPLL_CTRL3, + .shift = 9, + .width = 1, + }, + .range = &a4_hifi_pll_mult_range, + .init_regs = a4_hifi_init_regs, + .init_count = ARRAY_SIZE(a4_hifi_init_regs), + .frac_max = 100000, + .flags = CLK_MESON_PLL_ROUND_CLOSEST, + }, + .hw.init = &(struct clk_init_data) { + .name = "hifi_pll_dco", + .ops = &meson_clk_pll_ops, + .parent_data = &(const struct clk_parent_data) { + .fw_name = "xtal", + }, + .num_parents = 1, + }, +}; + +/* The maximum frequency divider supports is 16, not 128(2^7) */ +static const struct clk_div_table a4_hifi_pll_od_table[] = { + { 0, 1 }, + { 1, 2 }, + { 2, 4 }, + { 3, 8 }, + { 4, 16 }, + { /* sentinel */ } +}; + +static struct clk_regmap a4_hifi_pll = { + .data = &(struct clk_regmap_div_data) { + .offset = HIFIPLL_CTRL0, + .shift = 10, + .width = 3, + .table = a4_hifi_pll_od_table, + }, + .hw.init = &(struct clk_init_data) { + .name = "hifi_pll", + .ops = &clk_regmap_divider_ops, + .parent_hws = (const struct clk_hw *[]) { + &a4_hifi_pll_dco.hw + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT, + }, +}; + +static struct clk_hw *a4_pll_hw_clks[] = { + [CLKID_GP0_PLL_DCO] = &a4_gp0_pll_dco.hw, + [CLKID_GP0_PLL] = &a4_gp0_pll.hw, + [CLKID_HIFI_PLL_DCO] = &a4_hifi_pll_dco.hw, + [CLKID_HIFI_PLL] = &a4_hifi_pll.hw +}; + +static const struct meson_clkc_data a4_pll_clkc_data = { + .hw_clks = { + .hws = a4_pll_hw_clks, + .num = ARRAY_SIZE(a4_pll_hw_clks), + }, +}; + +static const struct of_device_id a4_pll_clkc_match_table[] = { + { + .compatible = "amlogic,a4-pll-clkc", + .data = &a4_pll_clkc_data, + }, + {} +}; +MODULE_DEVICE_TABLE(of, a4_pll_clkc_match_table); + +static struct platform_driver a4_pll_clkc_driver = { + .probe = meson_clkc_mmio_probe, + .driver = { + .name = "a4-pll-clkc", + .of_match_table = a4_pll_clkc_match_table, + }, +}; +module_platform_driver(a4_pll_clkc_driver); + +MODULE_DESCRIPTION("Amlogic A4 PLL Clock Controller driver"); +MODULE_AUTHOR("Chuan Liu <chuan.liu@amlogic.com>"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("CLK_MESON");
--
2.42.0