f9f8c0438d
On OMAP4+ platforms the functional clock for the McPDM IP is suplied by the twl6040 codec (bit clock on the PDM bus). This common clock driver for twl6040 will register the mcpdm_fclk clock to be used by the McPDM driver to make sure that the needed clocks are available when needed. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
127 lines
3.2 KiB
C
127 lines
3.2 KiB
C
/*
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* TWL6040 clock module driver for OMAP4 McPDM functional clock
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*
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* Copyright (C) 2012 Texas Instruments Inc.
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* Peter Ujfalusi <peter.ujfalusi@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/twl6040.h>
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#include <linux/clk-provider.h>
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struct twl6040_clk {
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struct twl6040 *twl6040;
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struct device *dev;
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struct clk_hw mcpdm_fclk;
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struct clk *clk;
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int enabled;
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};
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static int twl6040_bitclk_is_enabled(struct clk_hw *hw)
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{
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struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk,
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mcpdm_fclk);
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return twl6040_clk->enabled;
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}
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static int twl6040_bitclk_prepare(struct clk_hw *hw)
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{
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struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk,
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mcpdm_fclk);
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int ret;
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ret = twl6040_power(twl6040_clk->twl6040, 1);
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if (!ret)
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twl6040_clk->enabled = 1;
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return ret;
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}
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static void twl6040_bitclk_unprepare(struct clk_hw *hw)
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{
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struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk,
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mcpdm_fclk);
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int ret;
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ret = twl6040_power(twl6040_clk->twl6040, 0);
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if (!ret)
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twl6040_clk->enabled = 0;
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}
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static const struct clk_ops twl6040_mcpdm_ops = {
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.is_enabled = twl6040_bitclk_is_enabled,
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.prepare = twl6040_bitclk_prepare,
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.unprepare = twl6040_bitclk_unprepare,
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};
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static struct clk_init_data wm831x_clkout_init = {
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.name = "mcpdm_fclk",
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.ops = &twl6040_mcpdm_ops,
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.flags = CLK_IS_ROOT,
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};
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static int __devinit twl6040_clk_probe(struct platform_device *pdev)
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{
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struct twl6040 *twl6040 = dev_get_drvdata(pdev->dev.parent);
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struct twl6040_clk *clkdata;
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clkdata = devm_kzalloc(&pdev->dev, sizeof(*clkdata), GFP_KERNEL);
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if (!clkdata)
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return -ENOMEM;
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clkdata->dev = &pdev->dev;
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clkdata->twl6040 = twl6040;
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clkdata->mcpdm_fclk.init = &wm831x_clkout_init;
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clkdata->clk = clk_register(&pdev->dev, &clkdata->mcpdm_fclk);
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if (!clkdata->clk)
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return -EINVAL;
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dev_set_drvdata(&pdev->dev, clkdata);
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return 0;
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}
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static int __devexit twl6040_clk_remove(struct platform_device *pdev)
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{
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struct twl6040_clk *clkdata = dev_get_drvdata(&pdev->dev);
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clk_unregister(clkdata->clk);
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return 0;
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}
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static struct platform_driver twl6040_clk_driver = {
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.driver = {
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.name = "twl6040-clk",
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.owner = THIS_MODULE,
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},
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.probe = twl6040_clk_probe,
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.remove = __devexit_p(twl6040_clk_remove),
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};
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module_platform_driver(twl6040_clk_driver);
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MODULE_DESCRIPTION("TWL6040 clock driver for McPDM functional clock");
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MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
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MODULE_ALIAS("platform:twl6040-clk");
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MODULE_LICENSE("GPL");
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