![Krzysztof Kozlowski](/assets/img/avatar_default.png)
The driver was using subsys_initcall() because in old times deferred probe was not supported everywhere and specific ordering was needed. Since probe deferral works fine and specific ordering is discouraged (hides dependencies between drivers and couples their boot order), the driver can be converted to regular module_platform_driver. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/20200921203558.19554-1-krzk@kernel.org Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
275 lines
6.8 KiB
C
275 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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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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#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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#include <dt-bindings/clock/samsung,s2mps11.h>
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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 const 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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},
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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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},
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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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},
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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;
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struct clk_hw_onecell_data *clk_data;
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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_clks), GFP_KERNEL);
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if (!s2mps11_clks)
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return -ENOMEM;
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clk_data = devm_kzalloc(&pdev->dev,
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struct_size(clk_data, hws, S2MPS11_CLKS_NUM),
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GFP_KERNEL);
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if (!clk_data)
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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++) {
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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_clks[i].iodev = iodev;
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s2mps11_clks[i].hw.init = &s2mps11_clks_init[i];
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s2mps11_clks[i].mask = 1 << i;
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s2mps11_clks[i].reg = s2mps11_reg;
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s2mps11_clks[i].clk = devm_clk_register(&pdev->dev,
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&s2mps11_clks[i].hw);
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if (IS_ERR(s2mps11_clks[i].clk)) {
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dev_err(&pdev->dev, "Fail to register : %s\n",
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s2mps11_clks_init[i].name);
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ret = PTR_ERR(s2mps11_clks[i].clk);
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goto err_reg;
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}
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s2mps11_clks[i].lookup = clkdev_hw_create(&s2mps11_clks[i].hw,
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s2mps11_clks_init[i].name, NULL);
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if (!s2mps11_clks[i].lookup) {
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ret = -ENOMEM;
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goto err_reg;
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}
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clk_data->hws[i] = &s2mps11_clks[i].hw;
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}
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clk_data->num = S2MPS11_CLKS_NUM;
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of_clk_add_hw_provider(s2mps11_clks->clk_np, of_clk_hw_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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#ifdef CONFIG_OF
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/*
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* Device is instantiated through parent MFD device and device matching is done
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* through platform_device_id.
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*
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* However if device's DT node contains proper clock compatible and driver is
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* built as a module, then the *module* matching will be done trough DT aliases.
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* This requires of_device_id table. In the same time this will not change the
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* actual *device* matching so do not add .of_match_table.
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*/
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static const struct of_device_id s2mps11_dt_match[] __used = {
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{
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.compatible = "samsung,s2mps11-clk",
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.data = (void *)S2MPS11X,
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}, {
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.compatible = "samsung,s2mps13-clk",
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.data = (void *)S2MPS13X,
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}, {
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.compatible = "samsung,s2mps14-clk",
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.data = (void *)S2MPS14X,
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}, {
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.compatible = "samsung,s5m8767-clk",
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.data = (void *)S5M8767X,
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}, {
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/* Sentinel */
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},
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};
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MODULE_DEVICE_TABLE(of, s2mps11_dt_match);
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#endif
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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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module_platform_driver(s2mps11_clk_driver);
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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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