1 // SPDX-License-Identifier: GPL-2.0-or-later 2 // Copyright 2020 Cerno 3 4 #include <linux/clk-provider.h> 5 #include <linux/module.h> 6 #include <linux/platform_device.h> 7 #include <linux/reset-controller.h> 8 #include <linux/reset/reset-simple.h> 9 10 #define DVP_HT_RPI_SW_INIT 0x04 11 #define DVP_HT_RPI_MISC_CONFIG 0x08 12 13 #define NR_CLOCKS 2 14 #define NR_RESETS 6 15 16 struct clk_dvp { 17 struct clk_hw_onecell_data *data; 18 struct reset_simple_data reset; 19 }; 20 21 static const struct clk_parent_data clk_dvp_parent = { 22 .index = 0, 23 }; 24 25 static int clk_dvp_probe(struct platform_device *pdev) 26 { 27 struct clk_hw_onecell_data *data; 28 struct clk_dvp *dvp; 29 void __iomem *base; 30 int ret; 31 32 dvp = devm_kzalloc(&pdev->dev, sizeof(*dvp), GFP_KERNEL); 33 if (!dvp) 34 return -ENOMEM; 35 platform_set_drvdata(pdev, dvp); 36 37 dvp->data = devm_kzalloc(&pdev->dev, 38 struct_size(dvp->data, hws, NR_CLOCKS), 39 GFP_KERNEL); 40 if (!dvp->data) 41 return -ENOMEM; 42 data = dvp->data; 43 44 base = devm_platform_ioremap_resource(pdev, 0); 45 if (IS_ERR(base)) 46 return PTR_ERR(base); 47 48 dvp->reset.rcdev.owner = THIS_MODULE; 49 dvp->reset.rcdev.nr_resets = NR_RESETS; 50 dvp->reset.rcdev.ops = &reset_simple_ops; 51 dvp->reset.rcdev.of_node = pdev->dev.of_node; 52 dvp->reset.membase = base + DVP_HT_RPI_SW_INIT; 53 spin_lock_init(&dvp->reset.lock); 54 55 ret = devm_reset_controller_register(&pdev->dev, &dvp->reset.rcdev); 56 if (ret) 57 return ret; 58 59 data->hws[0] = clk_hw_register_gate_parent_data(&pdev->dev, 60 "hdmi0-108MHz", 61 &clk_dvp_parent, 0, 62 base + DVP_HT_RPI_MISC_CONFIG, 3, 63 CLK_GATE_SET_TO_DISABLE, 64 &dvp->reset.lock); 65 if (IS_ERR(data->hws[0])) 66 return PTR_ERR(data->hws[0]); 67 68 data->hws[1] = clk_hw_register_gate_parent_data(&pdev->dev, 69 "hdmi1-108MHz", 70 &clk_dvp_parent, 0, 71 base + DVP_HT_RPI_MISC_CONFIG, 4, 72 CLK_GATE_SET_TO_DISABLE, 73 &dvp->reset.lock); 74 if (IS_ERR(data->hws[1])) { 75 ret = PTR_ERR(data->hws[1]); 76 goto unregister_clk0; 77 } 78 79 data->num = NR_CLOCKS; 80 ret = of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get, 81 data); 82 if (ret) 83 goto unregister_clk1; 84 85 return 0; 86 87 unregister_clk1: 88 clk_hw_unregister_gate(data->hws[1]); 89 90 unregister_clk0: 91 clk_hw_unregister_gate(data->hws[0]); 92 return ret; 93 }; 94 95 static int clk_dvp_remove(struct platform_device *pdev) 96 { 97 struct clk_dvp *dvp = platform_get_drvdata(pdev); 98 struct clk_hw_onecell_data *data = dvp->data; 99 100 clk_hw_unregister_gate(data->hws[1]); 101 clk_hw_unregister_gate(data->hws[0]); 102 103 return 0; 104 } 105 106 static const struct of_device_id clk_dvp_dt_ids[] = { 107 { .compatible = "brcm,brcm2711-dvp", }, 108 { /* sentinel */ } 109 }; 110 MODULE_DEVICE_TABLE(of, clk_dvp_dt_ids); 111 112 static struct platform_driver clk_dvp_driver = { 113 .probe = clk_dvp_probe, 114 .remove = clk_dvp_remove, 115 .driver = { 116 .name = "brcm2711-dvp", 117 .of_match_table = clk_dvp_dt_ids, 118 }, 119 }; 120 module_platform_driver(clk_dvp_driver); 121 122 MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>"); 123 MODULE_DESCRIPTION("BCM2711 DVP clock driver"); 124 MODULE_LICENSE("GPL"); 125