1 /* 2 * TWL6040 clock module driver for OMAP4 McPDM functional clock 3 * 4 * Copyright (C) 2012 Texas Instruments Inc. 5 * Peter Ujfalusi <peter.ujfalusi@ti.com> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * version 2 as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 19 * 02110-1301 USA 20 * 21 */ 22 23 #include <linux/module.h> 24 #include <linux/slab.h> 25 #include <linux/platform_device.h> 26 #include <linux/mfd/twl6040.h> 27 #include <linux/clk-provider.h> 28 29 struct twl6040_clk { 30 struct twl6040 *twl6040; 31 struct device *dev; 32 struct clk_hw mcpdm_fclk; 33 struct clk *clk; 34 int enabled; 35 }; 36 37 static int twl6040_bitclk_is_enabled(struct clk_hw *hw) 38 { 39 struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk, 40 mcpdm_fclk); 41 return twl6040_clk->enabled; 42 } 43 44 static int twl6040_bitclk_prepare(struct clk_hw *hw) 45 { 46 struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk, 47 mcpdm_fclk); 48 int ret; 49 50 ret = twl6040_power(twl6040_clk->twl6040, 1); 51 if (!ret) 52 twl6040_clk->enabled = 1; 53 54 return ret; 55 } 56 57 static void twl6040_bitclk_unprepare(struct clk_hw *hw) 58 { 59 struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk, 60 mcpdm_fclk); 61 int ret; 62 63 ret = twl6040_power(twl6040_clk->twl6040, 0); 64 if (!ret) 65 twl6040_clk->enabled = 0; 66 } 67 68 static const struct clk_ops twl6040_mcpdm_ops = { 69 .is_enabled = twl6040_bitclk_is_enabled, 70 .prepare = twl6040_bitclk_prepare, 71 .unprepare = twl6040_bitclk_unprepare, 72 }; 73 74 static struct clk_init_data wm831x_clkout_init = { 75 .name = "mcpdm_fclk", 76 .ops = &twl6040_mcpdm_ops, 77 .flags = CLK_IS_ROOT, 78 }; 79 80 static int twl6040_clk_probe(struct platform_device *pdev) 81 { 82 struct twl6040 *twl6040 = dev_get_drvdata(pdev->dev.parent); 83 struct twl6040_clk *clkdata; 84 85 clkdata = devm_kzalloc(&pdev->dev, sizeof(*clkdata), GFP_KERNEL); 86 if (!clkdata) 87 return -ENOMEM; 88 89 clkdata->dev = &pdev->dev; 90 clkdata->twl6040 = twl6040; 91 92 clkdata->mcpdm_fclk.init = &wm831x_clkout_init; 93 clkdata->clk = devm_clk_register(&pdev->dev, &clkdata->mcpdm_fclk); 94 if (IS_ERR(clkdata->clk)) 95 return PTR_ERR(clkdata->clk); 96 97 platform_set_drvdata(pdev, clkdata); 98 99 return 0; 100 } 101 102 static struct platform_driver twl6040_clk_driver = { 103 .driver = { 104 .name = "twl6040-clk", 105 }, 106 .probe = twl6040_clk_probe, 107 }; 108 109 module_platform_driver(twl6040_clk_driver); 110 111 MODULE_DESCRIPTION("TWL6040 clock driver for McPDM functional clock"); 112 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); 113 MODULE_ALIAS("platform:twl6040-clk"); 114 MODULE_LICENSE("GPL"); 115