1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
270ee6577SLinus Walleij /*
370ee6577SLinus Walleij * Clock driver for the ARM Integrator/IM-PD1 board
48e048b99SLinus Walleij * Copyright (C) 2012-2013 Linus Walleij
570ee6577SLinus Walleij */
670ee6577SLinus Walleij #include <linux/clk-provider.h>
770ee6577SLinus Walleij #include <linux/clkdev.h>
870ee6577SLinus Walleij #include <linux/err.h>
970ee6577SLinus Walleij #include <linux/io.h>
1084655b76SLinus Walleij #include <linux/platform_device.h>
1184655b76SLinus Walleij #include <linux/module.h>
1284655b76SLinus Walleij #include <linux/mfd/syscon.h>
1384655b76SLinus Walleij #include <linux/regmap.h>
1470ee6577SLinus Walleij
15ba3fae06SLinus Walleij #include "icst.h"
1670ee6577SLinus Walleij #include "clk-icst.h"
1770ee6577SLinus Walleij
18cc0cc4caSLinus Walleij #define IMPD1_OSC1 0x00
19cc0cc4caSLinus Walleij #define IMPD1_OSC2 0x04
20cc0cc4caSLinus Walleij #define IMPD1_LOCK 0x08
21cc0cc4caSLinus Walleij
2270ee6577SLinus Walleij /*
238e048b99SLinus Walleij * There are two VCO's on the IM-PD1
2470ee6577SLinus Walleij */
2570ee6577SLinus Walleij
268e048b99SLinus Walleij static const struct icst_params impd1_vco1_params = {
2770ee6577SLinus Walleij .ref = 24000000, /* 24 MHz */
2870ee6577SLinus Walleij .vco_max = ICST525_VCO_MAX_3V,
2970ee6577SLinus Walleij .vco_min = ICST525_VCO_MIN,
3070ee6577SLinus Walleij .vd_min = 12,
3170ee6577SLinus Walleij .vd_max = 519,
3270ee6577SLinus Walleij .rd_min = 3,
3370ee6577SLinus Walleij .rd_max = 120,
3470ee6577SLinus Walleij .s2div = icst525_s2div,
3570ee6577SLinus Walleij .idx2s = icst525_idx2s,
3670ee6577SLinus Walleij };
3770ee6577SLinus Walleij
3870ee6577SLinus Walleij static const struct clk_icst_desc impd1_icst1_desc = {
398e048b99SLinus Walleij .params = &impd1_vco1_params,
4070ee6577SLinus Walleij .vco_offset = IMPD1_OSC1,
4170ee6577SLinus Walleij .lock_offset = IMPD1_LOCK,
4270ee6577SLinus Walleij };
4370ee6577SLinus Walleij
448e048b99SLinus Walleij static const struct icst_params impd1_vco2_params = {
458e048b99SLinus Walleij .ref = 24000000, /* 24 MHz */
468e048b99SLinus Walleij .vco_max = ICST525_VCO_MAX_3V,
478e048b99SLinus Walleij .vco_min = ICST525_VCO_MIN,
488e048b99SLinus Walleij .vd_min = 12,
498e048b99SLinus Walleij .vd_max = 519,
508e048b99SLinus Walleij .rd_min = 3,
518e048b99SLinus Walleij .rd_max = 120,
528e048b99SLinus Walleij .s2div = icst525_s2div,
538e048b99SLinus Walleij .idx2s = icst525_idx2s,
548e048b99SLinus Walleij };
558e048b99SLinus Walleij
568e048b99SLinus Walleij static const struct clk_icst_desc impd1_icst2_desc = {
578e048b99SLinus Walleij .params = &impd1_vco2_params,
588e048b99SLinus Walleij .vco_offset = IMPD1_OSC2,
598e048b99SLinus Walleij .lock_offset = IMPD1_LOCK,
608e048b99SLinus Walleij };
618e048b99SLinus Walleij
integrator_impd1_clk_spawn(struct device * dev,struct device_node * parent,struct device_node * np)6284655b76SLinus Walleij static int integrator_impd1_clk_spawn(struct device *dev,
6384655b76SLinus Walleij struct device_node *parent,
6484655b76SLinus Walleij struct device_node *np)
6584655b76SLinus Walleij {
6684655b76SLinus Walleij struct regmap *map;
6784655b76SLinus Walleij struct clk *clk = ERR_PTR(-EINVAL);
6884655b76SLinus Walleij const char *name = np->name;
6984655b76SLinus Walleij const char *parent_name;
7084655b76SLinus Walleij const struct clk_icst_desc *desc;
7184655b76SLinus Walleij int ret;
7284655b76SLinus Walleij
7384655b76SLinus Walleij map = syscon_node_to_regmap(parent);
7484655b76SLinus Walleij if (IS_ERR(map)) {
7584655b76SLinus Walleij pr_err("no regmap for syscon IM-PD1 ICST clock parent\n");
7684655b76SLinus Walleij return PTR_ERR(map);
7784655b76SLinus Walleij }
7884655b76SLinus Walleij
7984655b76SLinus Walleij if (of_device_is_compatible(np, "arm,impd1-vco1")) {
8084655b76SLinus Walleij desc = &impd1_icst1_desc;
8184655b76SLinus Walleij } else if (of_device_is_compatible(np, "arm,impd1-vco2")) {
8284655b76SLinus Walleij desc = &impd1_icst2_desc;
8384655b76SLinus Walleij } else {
8484655b76SLinus Walleij dev_err(dev, "not a clock node %s\n", name);
8584655b76SLinus Walleij return -ENODEV;
8684655b76SLinus Walleij }
8784655b76SLinus Walleij
8824661081SLinus Walleij of_property_read_string(np, "clock-output-names", &name);
8984655b76SLinus Walleij parent_name = of_clk_get_parent_name(np, 0);
9084655b76SLinus Walleij clk = icst_clk_setup(NULL, desc, name, parent_name, map,
9184655b76SLinus Walleij ICST_INTEGRATOR_IM_PD1);
9284655b76SLinus Walleij if (!IS_ERR(clk)) {
9384655b76SLinus Walleij of_clk_add_provider(np, of_clk_src_simple_get, clk);
9484655b76SLinus Walleij ret = 0;
9584655b76SLinus Walleij } else {
9684655b76SLinus Walleij dev_err(dev, "error setting up IM-PD1 ICST clock\n");
9784655b76SLinus Walleij ret = PTR_ERR(clk);
9884655b76SLinus Walleij }
9984655b76SLinus Walleij
10084655b76SLinus Walleij return ret;
10184655b76SLinus Walleij }
10284655b76SLinus Walleij
integrator_impd1_clk_probe(struct platform_device * pdev)10384655b76SLinus Walleij static int integrator_impd1_clk_probe(struct platform_device *pdev)
10484655b76SLinus Walleij {
10584655b76SLinus Walleij struct device *dev = &pdev->dev;
10684655b76SLinus Walleij struct device_node *np = dev->of_node;
10784655b76SLinus Walleij struct device_node *child;
10884655b76SLinus Walleij int ret = 0;
10984655b76SLinus Walleij
11084655b76SLinus Walleij for_each_available_child_of_node(np, child) {
11184655b76SLinus Walleij ret = integrator_impd1_clk_spawn(dev, np, child);
112*da9c43dcSSumera Priyadarsini if (ret) {
113*da9c43dcSSumera Priyadarsini of_node_put(child);
11484655b76SLinus Walleij break;
11584655b76SLinus Walleij }
116*da9c43dcSSumera Priyadarsini }
11784655b76SLinus Walleij
11884655b76SLinus Walleij return ret;
11984655b76SLinus Walleij }
12084655b76SLinus Walleij
12184655b76SLinus Walleij static const struct of_device_id impd1_syscon_match[] = {
12284655b76SLinus Walleij { .compatible = "arm,im-pd1-syscon", },
12384655b76SLinus Walleij {}
12484655b76SLinus Walleij };
12584655b76SLinus Walleij MODULE_DEVICE_TABLE(of, impd1_syscon_match);
12684655b76SLinus Walleij
12784655b76SLinus Walleij static struct platform_driver impd1_clk_driver = {
12884655b76SLinus Walleij .driver = {
12984655b76SLinus Walleij .name = "impd1-clk",
13084655b76SLinus Walleij .of_match_table = impd1_syscon_match,
13184655b76SLinus Walleij },
13284655b76SLinus Walleij .probe = integrator_impd1_clk_probe,
13384655b76SLinus Walleij };
13484655b76SLinus Walleij builtin_platform_driver(impd1_clk_driver);
13584655b76SLinus Walleij
13684655b76SLinus Walleij MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
13784655b76SLinus Walleij MODULE_DESCRIPTION("Arm IM-PD1 module clock driver");
13884655b76SLinus Walleij MODULE_LICENSE("GPL v2");
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