Quoting Ryan Chen (2024-10-27 22:30:18) > diff --git a/drivers/clk/clk-ast2700.c b/drivers/clk/clk-ast2700.c > new file mode 100644 > index 000000000000..db9ee5031b7c > --- /dev/null > +++ b/drivers/clk/clk-ast2700.c > @@ -0,0 +1,1513 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (c) 2024 ASPEED Technology Inc. > + * Author: Ryan Chen <ryan_chen@xxxxxxxxxxxxxx> > + */ > + > +#include <linux/auxiliary_bus.h> Is this include used? > +#include <linux/clk-provider.h> > +#include <linux/of_address.h> Is this include used? > +#include <linux/of_device.h> Probably should be mod_devicetable.h here > +#include <linux/of_platform.h> > +#include <linux/platform_device.h> > +#include <linux/slab.h> > +#include <linux/units.h> > + > +#include <dt-bindings/clock/aspeed,ast2700-scu.h> > +#include <soc/aspeed/reset-aspeed.h> This include can go before dt-bindings. > + > +#define SCU_CLK_12MHZ (12 * HZ_PER_MHZ) > +#define SCU_CLK_24MHZ (24 * HZ_PER_MHZ) > +#define SCU_CLK_25MHZ (25 * HZ_PER_MHZ) > +#define SCU_CLK_192MHZ (192 * HZ_PER_MHZ) > + > +/* SOC0 */ > +#define SCU0_HWSTRAP1 0x010 > +#define SCU0_CLK_STOP 0x240 > +#define SCU0_CLK_SEL1 0x280 > +#define SCU0_CLK_SEL2 0x284 > +#define GET_USB_REFCLK_DIV(x) ((GENMASK(23, 20) & (x)) >> 20) > +#define UART_DIV13_EN BIT(30) > +#define SCU0_HPLL_PARAM 0x300 > +#define SCU0_DPLL_PARAM 0x308 > +#define SCU0_MPLL_PARAM 0x310 > +#define SCU0_D0CLK_PARAM 0x320 > +#define SCU0_D1CLK_PARAM 0x330 > +#define SCU0_CRT0CLK_PARAM 0x340 > +#define SCU0_CRT1CLK_PARAM 0x350 > +#define SCU0_MPHYCLK_PARAM 0x360 It would be easier to read if these things were tabbed out a little. #define SCU0_MPHYCLK_PARAM 0x360 > + > +/* SOC1 */ > +#define SCU1_REVISION_ID 0x0 > +#define REVISION_ID GENMASK(23, 16) > +#define SCU1_CLK_STOP 0x240 > +#define SCU1_CLK_STOP2 0x260 > +#define SCU1_CLK_SEL1 0x280 > +#define SCU1_CLK_SEL2 0x284 > +#define UXCLK_MASK GENMASK(1, 0) > +#define HUXCLK_MASK GENMASK(4, 3) > +#define SCU1_HPLL_PARAM 0x300 > +#define SCU1_APLL_PARAM 0x310 > +#define SCU1_DPLL_PARAM 0x320 > +#define SCU1_UXCLK_CTRL 0x330 > +#define SCU1_HUXCLK_CTRL 0x334 > +#define SCU1_MAC12_CLK_DLY 0x390 > +#define SCU1_MAC12_CLK_DLY_100M 0x394 > +#define SCU1_MAC12_CLK_DLY_10M 0x398 > + > +enum { > + CLK_MUX, > + CLK_PLL, > + CLK_GATE, > + CLK_MISC, > + CLK_FIXED, > + CLK_DIVIDER, > + CLK_UART_PLL, > + CLK_DIV_TABLE, > + CLK_FIXED_FACTOR, > + CLK_GATE_ASPEED, > +}; > + > +struct ast2700_clk_info { > + const char *name; > + const char * const *parent_names; Please don't use strings for parent names. > + const struct clk_div_table *div_table; > + unsigned long fixed_rate; > + unsigned int mult; > + unsigned int div; > + u32 reg; > + u32 flags; > + u32 type; > + u8 clk_idx; > + u8 bit_shift; > + u8 bit_width; > + u8 num_parents; > +}; > + [...] > + > +static const struct clk_div_table ast2700_clk_div_table2[] = { > + { 0x0, 2 }, > + { 0x1, 4 }, > + { 0x2, 6 }, > + { 0x3, 8 }, > + { 0x4, 10 }, > + { 0x5, 12 }, > + { 0x6, 14 }, > + { 0x7, 16 }, Isn't this the default divider setting for struct clk_divider? > + { 0 } > +}; > + > +static const struct clk_div_table ast2700_clk_uart_div_table[] = { > + { 0x0, 1 }, > + { 0x1, 13 }, > + { 0 } [...] > + .bit_shift = 23, > + .bit_width = 3, > + .div_table = ast2700_clk_div_table2, > + }, > + [SCU0_CLK_GATE_MCLK] = { > + .type = CLK_GATE_ASPEED, > + .name = "mclk-gate", > + .parent_names = (const char *[]){ "soc0-mpll", }, > + .reg = SCU0_CLK_STOP, > + .clk_idx = 0, > + .flags = CLK_IS_CRITICAL, > + }, > + [SCU0_CLK_GATE_ECLK] = { > + .type = CLK_GATE_ASPEED, > + .name = "eclk-gate", > + .parent_names = (const char *[]){ }, > + .reg = SCU0_CLK_STOP, > + .clk_idx = 1, > + }, > + [SCU0_CLK_GATE_2DCLK] = { > + .type = CLK_GATE_ASPEED, > + .name = "gclk-gate", > + .parent_names = (const char *[]){ }, This has no parent? Why is parent_names set to an empty array? > + .reg = SCU0_CLK_STOP, > + .clk_idx = 2, > + }, > + [SCU0_CLK_GATE_VCLK] = { [...] > + > +static struct clk_hw *ast2700_clk_hw_register_pll(int clk_idx, void __iomem *reg, > + const struct ast2700_clk_info *clk, > + struct ast2700_clk_ctrl *clk_ctrl) > +{ > + int scu = clk_ctrl->clk_data->scu; > + unsigned int mult, div; > + u32 val; > + > + if (!scu && clk_idx == SCU0_CLK_HPLL) { > + val = readl(clk_ctrl->base + SCU0_HWSTRAP1); > + if ((val & GENMASK(3, 2)) != 0) { > + switch ((val & GENMASK(3, 2)) >> 2) { > + case 1: > + return devm_clk_hw_register_fixed_rate(clk_ctrl->dev, "soc0-hpll", > + NULL, 0, 1900000000); > + case 2: > + return devm_clk_hw_register_fixed_rate(clk_ctrl->dev, "soc0-hpll", > + NULL, 0, 1800000000); > + case 3: > + return devm_clk_hw_register_fixed_rate(clk_ctrl->dev, "soc0-hpll", > + NULL, 0, 1700000000); > + default: > + return ERR_PTR(-EINVAL); > + } > + } What if it is 0? Were we supposed to return an error? Why isn't HPLL a different type of PLL so that this function can be broken up into two PLL registration functions? > + } > + > + val = readl(reg); > + > + if (val & BIT(24)) { > + /* Pass through mode */ > + mult = 1; > + div = 1; > + } else { > + u32 m = val & 0x1fff; > + u32 n = (val >> 13) & 0x3f; > + u32 p = (val >> 19) & 0xf; > + > + if (scu) { > + mult = (m + 1) / (n + 1); > + div = (p + 1); > + } else { > + if (clk_idx == SCU0_CLK_MPLL) { > + mult = m / (n + 1); > + div = (p + 1); > + } else { > + mult = (m + 1) / (2 * (n + 1)); > + div = (p + 1); > + } > + } > + } > + > + return devm_clk_hw_register_fixed_factor(clk_ctrl->dev, clk->name, > + clk->parent_names[0], 0, mult, div); > +} > + [...] > + > +static int ast2700_soc_clk_probe(struct platform_device *pdev) > +{ > + struct ast2700_clk_data *clk_data; > + struct ast2700_clk_ctrl *clk_ctrl; > + struct clk_hw_onecell_data *clk_hw_data; > + struct device *dev = &pdev->dev; > + void __iomem *clk_base; > + struct clk_hw **hws; > + char *reset_name; > + int ret; > + int i; > + > + clk_ctrl = devm_kzalloc(dev, sizeof(*clk_ctrl), GFP_KERNEL); > + if (!clk_ctrl) > + return -ENOMEM; > + clk_ctrl->dev = dev; > + dev_set_drvdata(&pdev->dev, clk_ctrl); > + > + spin_lock_init(&clk_ctrl->lock); > + > + clk_base = devm_platform_ioremap_resource(pdev, 0); > + if (IS_ERR(clk_base)) > + return PTR_ERR(clk_base); > + > + clk_ctrl->base = clk_base; > + > + clk_data = (struct ast2700_clk_data *)of_device_get_match_data(dev); Just clk_data = device_get_match_data(dev); > + if (!clk_data) > + return devm_of_platform_populate(dev); What is being populated? Isn't there always clk_data? > + > + clk_ctrl->clk_data = clk_data; > + reset_name = devm_kasprintf(dev, GFP_KERNEL, "reset%d", clk_data->scu); > + > + clk_hw_data = devm_kzalloc(dev, struct_size(clk_hw_data, hws, clk_data->nr_clks), > + GFP_KERNEL); > + if (!clk_hw_data) > + return -ENOMEM; > + > + clk_hw_data->num = clk_data->nr_clks; > + hws = clk_hw_data->hws; > + > + for (i = 0; i < clk_data->nr_clks; i++) { > + const struct ast2700_clk_info *clk = &clk_data->clk_info[i]; > + void __iomem *reg = clk_ctrl->base + clk->reg; > + > + if (clk->type == CLK_FIXED) { > + hws[i] = devm_clk_hw_register_fixed_rate(dev, clk->name, NULL, > + clk->flags, clk->fixed_rate); > + } else if (clk->type == CLK_FIXED_FACTOR) { > + hws[i] = devm_clk_hw_register_fixed_factor(dev, clk->name, > + clk->parent_names[0], clk->flags, > + clk->mult, clk->div); > + } else if (clk->type == CLK_PLL) { > + hws[i] = ast2700_clk_hw_register_pll(i, reg, clk, clk_ctrl); > + } else if (clk->type == CLK_UART_PLL) { > + hws[i] = ast2700_clk_hw_register_uartpll(i, reg, clk, clk_ctrl); > + } else if (clk->type == CLK_MUX) { > + hws[i] = devm_clk_hw_register_mux(dev, clk->name, clk->parent_names, Please don't use strings for parent_names. Use clk_hw pointers or DT indices. > + clk->num_parents, clk->flags, reg, > + clk->bit_shift, clk->bit_width, > + 0, &clk_ctrl->lock); > + } else if (clk->type == CLK_MISC) { > + hws[i] = ast2700_clk_hw_register_misc(i, reg, clk, clk_ctrl); > + } else if (clk->type == CLK_DIVIDER) { > + hws[i] = devm_clk_hw_register_divider(dev, clk->name, clk->parent_names[0], > + clk->flags, reg, clk->bit_shift, > + clk->bit_width, 0, > + &clk_ctrl->lock); > + } else if (clk->type == CLK_DIV_TABLE) { > + hws[i] = clk_hw_register_divider_table(dev, clk->name, clk->parent_names[0], > + clk->flags, reg, clk->bit_shift, > + clk->bit_width, 0, > + clk->div_table, &clk_ctrl->lock); > + } else if (clk->type == CLK_GATE_ASPEED) { > + hws[i] = ast2700_clk_hw_register_gate(dev, clk->name, clk->parent_names[0], > + clk->flags, reg, clk->clk_idx, > + clk->flags, &clk_ctrl->lock); > + } else { > + hws[i] = clk_hw_register_gate(dev, clk->name, clk->parent_names[0], > + clk->flags, reg, clk->clk_idx, clk->flags, > + &clk_ctrl->lock); > + } > + > + if (IS_ERR(hws[i])) > + return PTR_ERR(hws[i]); > + } > + > + ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_hw_data); > + if (ret) > + return ret; > + > + return aspeed_reset_controller_register(dev, clk_base, reset_name); > +} > + > +static const struct ast2700_clk_data ast2700_clk0_data = { > + .scu = 0, > + .nr_clks = ARRAY_SIZE(ast2700_scu0_clk_info), > + .clk_info = ast2700_scu0_clk_info, > +}; > + > +static const struct ast2700_clk_data ast2700_clk1_data = { > + .scu = 1, > + .nr_clks = ARRAY_SIZE(ast2700_scu1_clk_info), > + .clk_info = ast2700_scu1_clk_info, > +}; > + > +static const struct of_device_id ast2700_scu_match[] = { > + { .compatible = "aspeed,ast2700-scu0", .data = &ast2700_clk0_data }, > + { .compatible = "aspeed,ast2700-scu1", .data = &ast2700_clk1_data }, > + { /* sentinel */ } > +}; > + > +MODULE_DEVICE_TABLE(of, ast2700_scu_match); > + > +static struct platform_driver ast2700_scu_driver = { > + .driver = { > + .name = "clk-ast2700", > + .of_match_table = ast2700_scu_match, > + }, > +}; > + > +builtin_platform_driver_probe(ast2700_scu_driver, ast2700_soc_clk_probe); Use module_platform_driver_probe() and make the config tristate. I don't see what's preventing this from being a module.