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![Andi Shyti](/assets/img/avatar_default.png)
The driver allocates three structures, s2mpsxx_clk_init, for three different clock types (s2mps11, s2mps13 and s2mps14). They are quite similar but they differ only by the name. Only one of these structures is used, while the others lie unused in the memory. The clock's name, though, is not such a meaningful information and by assigning the same name to the initial data we can avoid over allocation. The common name chosen will be s2mps11, coherently with the device driver name, instead of the clock device. Therefore, remove the structures associated to s2mps13 and s2mps14 and use only the one referred to s2mps11 for all kind of clocks. Signed-off-by: Andi Shyti <andi.shyti@samsung.com> Suggested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
280 lines
6.9 KiB
C
280 lines
6.9 KiB
C
/*
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* clk-s2mps11.c - Clock driver for S2MPS11.
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*
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* Copyright (C) 2013,2014 Samsung Electornics
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/clkdev.h>
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#include <linux/regmap.h>
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#include <linux/clk-provider.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/samsung/s2mps11.h>
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#include <linux/mfd/samsung/s2mps13.h>
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#include <linux/mfd/samsung/s2mps14.h>
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#include <linux/mfd/samsung/s5m8767.h>
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#include <linux/mfd/samsung/core.h>
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#define s2mps11_name(a) (a->hw.init->name)
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static struct clk **clk_table;
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static struct clk_onecell_data clk_data;
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enum {
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S2MPS11_CLK_AP = 0,
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S2MPS11_CLK_CP,
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S2MPS11_CLK_BT,
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S2MPS11_CLKS_NUM,
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};
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struct s2mps11_clk {
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struct sec_pmic_dev *iodev;
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struct device_node *clk_np;
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struct clk_hw hw;
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struct clk *clk;
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struct clk_lookup *lookup;
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u32 mask;
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unsigned int reg;
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};
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static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw)
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{
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return container_of(hw, struct s2mps11_clk, hw);
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}
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static int s2mps11_clk_prepare(struct clk_hw *hw)
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{
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struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
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return regmap_update_bits(s2mps11->iodev->regmap_pmic,
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s2mps11->reg,
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s2mps11->mask, s2mps11->mask);
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}
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static void s2mps11_clk_unprepare(struct clk_hw *hw)
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{
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struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
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regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
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s2mps11->mask, ~s2mps11->mask);
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}
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static int s2mps11_clk_is_prepared(struct clk_hw *hw)
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{
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int ret;
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u32 val;
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struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
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ret = regmap_read(s2mps11->iodev->regmap_pmic,
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s2mps11->reg, &val);
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if (ret < 0)
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return -EINVAL;
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return val & s2mps11->mask;
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}
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static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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return 32768;
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}
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static struct clk_ops s2mps11_clk_ops = {
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.prepare = s2mps11_clk_prepare,
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.unprepare = s2mps11_clk_unprepare,
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.is_prepared = s2mps11_clk_is_prepared,
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.recalc_rate = s2mps11_clk_recalc_rate,
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};
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/* This s2mps11_clks_init tructure is common to s2mps11, s2mps13 and s2mps14 */
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static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
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[S2MPS11_CLK_AP] = {
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.name = "s2mps11_ap",
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.ops = &s2mps11_clk_ops,
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.flags = CLK_IS_ROOT,
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},
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[S2MPS11_CLK_CP] = {
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.name = "s2mps11_cp",
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.ops = &s2mps11_clk_ops,
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.flags = CLK_IS_ROOT,
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},
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[S2MPS11_CLK_BT] = {
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.name = "s2mps11_bt",
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.ops = &s2mps11_clk_ops,
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.flags = CLK_IS_ROOT,
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},
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};
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static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
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struct clk_init_data *clks_init)
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{
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struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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struct device_node *clk_np;
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int i;
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if (!iodev->dev->of_node)
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return ERR_PTR(-EINVAL);
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clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
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if (!clk_np) {
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dev_err(&pdev->dev, "could not find clock sub-node\n");
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return ERR_PTR(-EINVAL);
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}
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for (i = 0; i < S2MPS11_CLKS_NUM; i++)
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of_property_read_string_index(clk_np, "clock-output-names", i,
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&clks_init[i].name);
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return clk_np;
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}
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static int s2mps11_clk_probe(struct platform_device *pdev)
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{
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struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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struct s2mps11_clk *s2mps11_clks, *s2mps11_clk;
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unsigned int s2mps11_reg;
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int i, ret = 0;
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enum sec_device_type hwid = platform_get_device_id(pdev)->driver_data;
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s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
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sizeof(*s2mps11_clk), GFP_KERNEL);
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if (!s2mps11_clks)
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return -ENOMEM;
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s2mps11_clk = s2mps11_clks;
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clk_table = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
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sizeof(struct clk *), GFP_KERNEL);
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if (!clk_table)
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return -ENOMEM;
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switch (hwid) {
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case S2MPS11X:
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s2mps11_reg = S2MPS11_REG_RTC_CTRL;
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break;
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case S2MPS13X:
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s2mps11_reg = S2MPS13_REG_RTCCTRL;
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break;
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case S2MPS14X:
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s2mps11_reg = S2MPS14_REG_RTCCTRL;
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break;
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case S5M8767X:
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s2mps11_reg = S5M8767_REG_CTRL1;
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break;
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default:
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dev_err(&pdev->dev, "Invalid device type\n");
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return -EINVAL;
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}
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/* Store clocks of_node in first element of s2mps11_clks array */
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s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, s2mps11_clks_init);
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if (IS_ERR(s2mps11_clks->clk_np))
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return PTR_ERR(s2mps11_clks->clk_np);
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for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) {
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if (i == S2MPS11_CLK_CP && hwid == S2MPS14X)
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continue; /* Skip clocks not present in some devices */
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s2mps11_clk->iodev = iodev;
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s2mps11_clk->hw.init = &s2mps11_clks_init[i];
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s2mps11_clk->mask = 1 << i;
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s2mps11_clk->reg = s2mps11_reg;
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s2mps11_clk->clk = devm_clk_register(&pdev->dev,
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&s2mps11_clk->hw);
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if (IS_ERR(s2mps11_clk->clk)) {
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dev_err(&pdev->dev, "Fail to register : %s\n",
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s2mps11_name(s2mps11_clk));
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ret = PTR_ERR(s2mps11_clk->clk);
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goto err_reg;
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}
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s2mps11_clk->lookup = clkdev_create(s2mps11_clk->clk,
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s2mps11_name(s2mps11_clk), NULL);
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if (!s2mps11_clk->lookup) {
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ret = -ENOMEM;
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goto err_reg;
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}
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clk_table[i] = s2mps11_clks[i].clk;
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}
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clk_data.clks = clk_table;
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clk_data.clk_num = S2MPS11_CLKS_NUM;
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of_clk_add_provider(s2mps11_clks->clk_np, of_clk_src_onecell_get,
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&clk_data);
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platform_set_drvdata(pdev, s2mps11_clks);
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return ret;
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err_reg:
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while (--i >= 0)
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clkdev_drop(s2mps11_clks[i].lookup);
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return ret;
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}
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static int s2mps11_clk_remove(struct platform_device *pdev)
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{
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struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
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int i;
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of_clk_del_provider(s2mps11_clks[0].clk_np);
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/* Drop the reference obtained in s2mps11_clk_parse_dt */
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of_node_put(s2mps11_clks[0].clk_np);
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for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
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/* Skip clocks not present on S2MPS14 */
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if (!s2mps11_clks[i].lookup)
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continue;
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clkdev_drop(s2mps11_clks[i].lookup);
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}
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return 0;
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}
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static const struct platform_device_id s2mps11_clk_id[] = {
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{ "s2mps11-clk", S2MPS11X},
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{ "s2mps13-clk", S2MPS13X},
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{ "s2mps14-clk", S2MPS14X},
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{ "s5m8767-clk", S5M8767X},
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{ },
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};
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MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
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static struct platform_driver s2mps11_clk_driver = {
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.driver = {
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.name = "s2mps11-clk",
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},
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.probe = s2mps11_clk_probe,
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.remove = s2mps11_clk_remove,
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.id_table = s2mps11_clk_id,
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};
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static int __init s2mps11_clk_init(void)
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{
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return platform_driver_register(&s2mps11_clk_driver);
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}
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subsys_initcall(s2mps11_clk_init);
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static void __exit s2mps11_clk_cleanup(void)
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{
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platform_driver_unregister(&s2mps11_clk_driver);
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}
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module_exit(s2mps11_clk_cleanup);
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MODULE_DESCRIPTION("S2MPS11 Clock Driver");
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MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
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MODULE_LICENSE("GPL");
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