| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Marvell Armada 37xx SoC xtal clocks |
| 3 | * |
| 4 | * Copyright (C) 2016 Marvell |
| 5 | * |
| 6 | * Gregory CLEMENT <gregory.clement@free-electrons.com> |
| 7 | * |
| 8 | * This file is licensed under the terms of the GNU General Public |
| 9 | * License version 2. This program is licensed "as is" without any |
| 10 | * warranty of any kind, whether express or implied. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/clk-provider.h> |
| 14 | #include <linux/mfd/syscon.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/regmap.h> |
| 17 | |
| 18 | #define NB_GPIO1_LATCH 0xC |
| 19 | #define XTAL_MODE BIT(31) |
| 20 | |
| 21 | static int armada_3700_xtal_clock_probe(struct platform_device *pdev) |
| 22 | { |
| 23 | struct device_node *np = pdev->dev.of_node; |
| 24 | const char *xtal_name = "xtal"; |
| 25 | struct device_node *parent; |
| 26 | struct regmap *regmap; |
| 27 | struct clk_hw *xtal_hw; |
| 28 | unsigned int rate; |
| 29 | u32 reg; |
| 30 | int ret; |
| 31 | |
| 32 | xtal_hw = devm_kzalloc(&pdev->dev, sizeof(*xtal_hw), GFP_KERNEL); |
| 33 | if (!xtal_hw) |
| 34 | return -ENOMEM; |
| 35 | |
| 36 | platform_set_drvdata(pdev, xtal_hw); |
| 37 | |
| 38 | parent = np->parent; |
| 39 | if (!parent) { |
| 40 | dev_err(&pdev->dev, "no parent\n"); |
| 41 | return -ENODEV; |
| 42 | } |
| 43 | |
| 44 | regmap = syscon_node_to_regmap(parent); |
| 45 | if (IS_ERR(regmap)) { |
| 46 | dev_err(&pdev->dev, "cannot get regmap\n"); |
| 47 | return PTR_ERR(regmap); |
| 48 | } |
| 49 | |
| 50 | ret = regmap_read(regmap, NB_GPIO1_LATCH, ®); |
| 51 | if (ret) { |
| 52 | dev_err(&pdev->dev, "cannot read from regmap\n"); |
| 53 | return ret; |
| 54 | } |
| 55 | |
| 56 | if (reg & XTAL_MODE) |
| 57 | rate = 40000000; |
| 58 | else |
| 59 | rate = 25000000; |
| 60 | |
| 61 | of_property_read_string_index(np, "clock-output-names", 0, &xtal_name); |
| 62 | xtal_hw = clk_hw_register_fixed_rate(NULL, xtal_name, NULL, 0, rate); |
| 63 | if (IS_ERR(xtal_hw)) |
| 64 | return PTR_ERR(xtal_hw); |
| 65 | ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, xtal_hw); |
| 66 | |
| 67 | return ret; |
| 68 | } |
| 69 | |
| 70 | static int armada_3700_xtal_clock_remove(struct platform_device *pdev) |
| 71 | { |
| 72 | of_clk_del_provider(pdev->dev.of_node); |
| 73 | |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | static const struct of_device_id armada_3700_xtal_clock_of_match[] = { |
| 78 | { .compatible = "marvell,armada-3700-xtal-clock", }, |
| 79 | { } |
| 80 | }; |
| 81 | |
| 82 | static struct platform_driver armada_3700_xtal_clock_driver = { |
| 83 | .probe = armada_3700_xtal_clock_probe, |
| 84 | .remove = armada_3700_xtal_clock_remove, |
| 85 | .driver = { |
| 86 | .name = "marvell-armada-3700-xtal-clock", |
| 87 | .of_match_table = armada_3700_xtal_clock_of_match, |
| 88 | }, |
| 89 | }; |
| 90 | |
| 91 | builtin_platform_driver(armada_3700_xtal_clock_driver); |