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275 lines
6.9 KiB
275 lines
6.9 KiB
// 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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of_node_put(s2mps11_clks[0].clk_np); |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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