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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Clock driver for the ARM Integrator/IM-PD1 board
- * Copyright (C) 2012-2013 Linus Walleij
- */
- #include <linux/clk-provider.h>
- #include <linux/clkdev.h>
- #include <linux/err.h>
- #include <linux/io.h>
- #include <linux/platform_device.h>
- #include <linux/module.h>
- #include <linux/mfd/syscon.h>
- #include <linux/regmap.h>
- #include "icst.h"
- #include "clk-icst.h"
- #define IMPD1_OSC1 0x00
- #define IMPD1_OSC2 0x04
- #define IMPD1_LOCK 0x08
- /*
- * There are two VCO's on the IM-PD1
- */
- static const struct icst_params impd1_vco1_params = {
- .ref = 24000000, /* 24 MHz */
- .vco_max = ICST525_VCO_MAX_3V,
- .vco_min = ICST525_VCO_MIN,
- .vd_min = 12,
- .vd_max = 519,
- .rd_min = 3,
- .rd_max = 120,
- .s2div = icst525_s2div,
- .idx2s = icst525_idx2s,
- };
- static const struct clk_icst_desc impd1_icst1_desc = {
- .params = &impd1_vco1_params,
- .vco_offset = IMPD1_OSC1,
- .lock_offset = IMPD1_LOCK,
- };
- static const struct icst_params impd1_vco2_params = {
- .ref = 24000000, /* 24 MHz */
- .vco_max = ICST525_VCO_MAX_3V,
- .vco_min = ICST525_VCO_MIN,
- .vd_min = 12,
- .vd_max = 519,
- .rd_min = 3,
- .rd_max = 120,
- .s2div = icst525_s2div,
- .idx2s = icst525_idx2s,
- };
- static const struct clk_icst_desc impd1_icst2_desc = {
- .params = &impd1_vco2_params,
- .vco_offset = IMPD1_OSC2,
- .lock_offset = IMPD1_LOCK,
- };
- static int integrator_impd1_clk_spawn(struct device *dev,
- struct device_node *parent,
- struct device_node *np)
- {
- struct regmap *map;
- struct clk *clk = ERR_PTR(-EINVAL);
- const char *name = np->name;
- const char *parent_name;
- const struct clk_icst_desc *desc;
- int ret;
- map = syscon_node_to_regmap(parent);
- if (IS_ERR(map)) {
- pr_err("no regmap for syscon IM-PD1 ICST clock parent\n");
- return PTR_ERR(map);
- }
- if (of_device_is_compatible(np, "arm,impd1-vco1")) {
- desc = &impd1_icst1_desc;
- } else if (of_device_is_compatible(np, "arm,impd1-vco2")) {
- desc = &impd1_icst2_desc;
- } else {
- dev_err(dev, "not a clock node %s\n", name);
- return -ENODEV;
- }
- of_property_read_string(np, "clock-output-names", &name);
- parent_name = of_clk_get_parent_name(np, 0);
- clk = icst_clk_setup(NULL, desc, name, parent_name, map,
- ICST_INTEGRATOR_IM_PD1);
- if (!IS_ERR(clk)) {
- of_clk_add_provider(np, of_clk_src_simple_get, clk);
- ret = 0;
- } else {
- dev_err(dev, "error setting up IM-PD1 ICST clock\n");
- ret = PTR_ERR(clk);
- }
- return ret;
- }
- static int integrator_impd1_clk_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct device_node *np = dev->of_node;
- struct device_node *child;
- int ret = 0;
- for_each_available_child_of_node(np, child) {
- ret = integrator_impd1_clk_spawn(dev, np, child);
- if (ret) {
- of_node_put(child);
- break;
- }
- }
- return ret;
- }
- static const struct of_device_id impd1_syscon_match[] = {
- { .compatible = "arm,im-pd1-syscon", },
- {}
- };
- MODULE_DEVICE_TABLE(of, impd1_syscon_match);
- static struct platform_driver impd1_clk_driver = {
- .driver = {
- .name = "impd1-clk",
- .of_match_table = impd1_syscon_match,
- },
- .probe = integrator_impd1_clk_probe,
- };
- builtin_platform_driver(impd1_clk_driver);
- MODULE_AUTHOR("Linus Walleij <[email protected]>");
- MODULE_DESCRIPTION("Arm IM-PD1 module clock driver");
- MODULE_LICENSE("GPL v2");
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