1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2018, The Linux Foundation. All rights reserved. 3 4 #include <linux/kernel.h> 5 #include <linux/init.h> 6 #include <linux/module.h> 7 #include <linux/platform_device.h> 8 #include <linux/err.h> 9 #include <linux/io.h> 10 #include <linux/of.h> 11 #include <linux/of_device.h> 12 #include <linux/clk.h> 13 #include <linux/clk-provider.h> 14 15 static const struct clk_parent_data aux_parents[] = { 16 { .fw_name = "pll8_vote", .name = "pll8_vote" }, 17 { .fw_name = "pxo", .name = "pxo_board" }, 18 }; 19 20 static const u32 aux_parent_map[] = { 21 3, 22 0, 23 }; 24 25 static const struct of_device_id kpss_xcc_match_table[] = { 26 { .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL }, 27 { .compatible = "qcom,kpss-gcc" }, 28 {} 29 }; 30 MODULE_DEVICE_TABLE(of, kpss_xcc_match_table); 31 32 static int kpss_xcc_driver_probe(struct platform_device *pdev) 33 { 34 struct device *dev = &pdev->dev; 35 const struct of_device_id *id; 36 void __iomem *base; 37 struct clk_hw *hw; 38 const char *name; 39 40 id = of_match_device(kpss_xcc_match_table, dev); 41 if (!id) 42 return -ENODEV; 43 44 base = devm_platform_ioremap_resource(pdev, 0); 45 if (IS_ERR(base)) 46 return PTR_ERR(base); 47 48 if (id->data) { 49 if (of_property_read_string_index(dev->of_node, 50 "clock-output-names", 51 0, &name)) 52 return -ENODEV; 53 base += 0x14; 54 } else { 55 name = "acpu_l2_aux"; 56 base += 0x28; 57 } 58 59 hw = devm_clk_hw_register_mux_parent_data_table(dev, name, aux_parents, 60 ARRAY_SIZE(aux_parents), 0, 61 base, 0, 0x3, 62 0, aux_parent_map, NULL); 63 if (IS_ERR(hw)) 64 return PTR_ERR(hw); 65 66 of_clk_add_hw_provider(dev->of_node, of_clk_hw_simple_get, hw); 67 68 return 0; 69 } 70 71 static struct platform_driver kpss_xcc_driver = { 72 .probe = kpss_xcc_driver_probe, 73 .driver = { 74 .name = "kpss-xcc", 75 .of_match_table = kpss_xcc_match_table, 76 }, 77 }; 78 module_platform_driver(kpss_xcc_driver); 79 80 MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver"); 81 MODULE_LICENSE("GPL v2"); 82 MODULE_ALIAS("platform:kpss-xcc"); 83