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The driver is to provide the functional clock to OMAP4/5 McPDM. The clock is named as pdmclk in the documentations so change the function names, structure names and variables to align with this. At the same time rename the driver from "twl6040-clk" to "twl6040-pdmclk". This can be done w/o regression since the clock driver is not in use at the moment, the MFD core driver is not even registering the device for it. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
128 lines
3.3 KiB
C
128 lines
3.3 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/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_pdmclk {
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struct twl6040 *twl6040;
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struct device *dev;
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struct clk_hw pdmclk_hw;
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struct clk *clk;
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int enabled;
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};
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static int twl6040_pdmclk_is_prepared(struct clk_hw *hw)
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{
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struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk,
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pdmclk_hw);
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return pdmclk->enabled;
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}
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static int twl6040_pdmclk_prepare(struct clk_hw *hw)
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{
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struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk,
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pdmclk_hw);
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int ret;
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ret = twl6040_power(pdmclk->twl6040, 1);
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if (!ret)
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pdmclk->enabled = 1;
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return ret;
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}
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static void twl6040_pdmclk_unprepare(struct clk_hw *hw)
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{
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struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk,
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pdmclk_hw);
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int ret;
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ret = twl6040_power(pdmclk->twl6040, 0);
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if (!ret)
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pdmclk->enabled = 0;
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}
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static unsigned long twl6040_pdmclk_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk,
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pdmclk_hw);
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return twl6040_get_sysclk(pdmclk->twl6040);
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}
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static const struct clk_ops twl6040_pdmclk_ops = {
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.is_prepared = twl6040_pdmclk_is_prepared,
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.prepare = twl6040_pdmclk_prepare,
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.unprepare = twl6040_pdmclk_unprepare,
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.recalc_rate = twl6040_pdmclk_recalc_rate,
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};
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static struct clk_init_data twl6040_pdmclk_init = {
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.name = "pdmclk",
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.ops = &twl6040_pdmclk_ops,
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.flags = CLK_GET_RATE_NOCACHE,
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};
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static int twl6040_pdmclk_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_pdmclk *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->pdmclk_hw.init = &twl6040_pdmclk_init;
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clkdata->clk = devm_clk_register(&pdev->dev, &clkdata->pdmclk_hw);
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if (IS_ERR(clkdata->clk))
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return PTR_ERR(clkdata->clk);
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platform_set_drvdata(pdev, clkdata);
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return of_clk_add_provider(pdev->dev.parent->of_node,
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of_clk_src_simple_get, clkdata->clk);
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}
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static struct platform_driver twl6040_pdmclk_driver = {
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.driver = {
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.name = "twl6040-pdmclk",
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},
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.probe = twl6040_pdmclk_probe,
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};
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module_platform_driver(twl6040_pdmclk_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-pdmclk");
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MODULE_LICENSE("GPL");
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