clk: s2mps11: Add support for s2mps11 (7cc560de) · Commits · e / devices / android_kernel_samsung_universal8890

drivers/clk/Kconfig

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Original line number	Original line	Diff line number	Diff line
	@@ -64,6 +64,12 @@ config COMMON_CLK_SI5351
	This driver supports Silicon Labs 5351A/B/C programmable clock		This driver supports Silicon Labs 5351A/B/C programmable clock
	generators.		generators.

			config COMMON_CLK_S2MPS11
			tristate "Clock driver for S2MPS11 MFD"
			depends on MFD_SEC_CORE
			---help---
			This driver supports S2MPS11 crystal oscillator clock.

	config CLK_TWL6040		config CLK_TWL6040
	tristate "External McPDM functional clock from twl6040"		tristate "External McPDM functional clock from twl6040"
	depends on TWL6040_CORE		depends on TWL6040_CORE

drivers/clk/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -40,5 +40,6 @@ obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN) += clk-axi-clkgen.o
	obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o		obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o
	obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o		obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o
	obj-$(CONFIG_COMMON_CLK_SI5351) += clk-si5351.o		obj-$(CONFIG_COMMON_CLK_SI5351) += clk-si5351.o
			obj-$(CONFIG_COMMON_CLK_S2MPS11) += clk-s2mps11.o
	obj-$(CONFIG_CLK_TWL6040) += clk-twl6040.o		obj-$(CONFIG_CLK_TWL6040) += clk-twl6040.o
	obj-$(CONFIG_CLK_PPC_CORENET) += clk-ppc-corenet.o		obj-$(CONFIG_CLK_PPC_CORENET) += clk-ppc-corenet.o

drivers/clk/clk-s2mps11.c

0 → 100644

+273 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* clk-s2mps11.c - Clock driver for S2MPS11.
			*
			* Copyright (C) 2013 Samsung Electornics
			*
			* This program is free software; you can redistribute it and/or modify it
			* under the terms of the GNU General Public License as published by the
			* Free Software Foundation; either version 2 of the License, or (at your
			* option) any later version.
			*
			* This program is distributed in the hope that it will be useful,
			* but WITHOUT ANY WARRANTY; without even the implied warranty of
			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
			* GNU General Public License for more details.
			*
			* You should have received a copy of the GNU General Public License
			* along with this program; if not, write to the Free Software
			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
			*
			*/

			#include <linux/module.h>
			#include <linux/err.h>
			#include <linux/of.h>
			#include <linux/clkdev.h>
			#include <linux/regmap.h>
			#include <linux/clk-provider.h>
			#include <linux/platform_device.h>
			#include <linux/mfd/samsung/s2mps11.h>
			#include <linux/mfd/samsung/core.h>

			#define s2mps11_name(a) (a->hw.init->name)

			static struct clk **clk_table;
			static struct clk_onecell_data clk_data;

			enum {
			S2MPS11_CLK_AP = 0,
			S2MPS11_CLK_CP,
			S2MPS11_CLK_BT,
			S2MPS11_CLKS_NUM,
			};

			struct s2mps11_clk {
			struct sec_pmic_dev *iodev;
			struct clk_hw hw;
			struct clk *clk;
			struct clk_lookup *lookup;
			u32 mask;
			bool enabled;
			};

			static struct s2mps11_clk to_s2mps11_clk(struct clk_hw hw)
			{
			return container_of(hw, struct s2mps11_clk, hw);
			}

			static int s2mps11_clk_prepare(struct clk_hw *hw)
			{
			struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
			int ret;

			ret = regmap_update_bits(s2mps11->iodev->regmap,
			S2MPS11_REG_RTC_CTRL,
			s2mps11->mask, s2mps11->mask);
			if (!ret)
			s2mps11->enabled = true;

			return ret;
			}

			static void s2mps11_clk_unprepare(struct clk_hw *hw)
			{
			struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
			int ret;

			ret = regmap_update_bits(s2mps11->iodev->regmap, S2MPS11_REG_RTC_CTRL,
			s2mps11->mask, ~s2mps11->mask);

			if (!ret)
			s2mps11->enabled = false;
			}

			static int s2mps11_clk_is_enabled(struct clk_hw *hw)
			{
			struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);

			return s2mps11->enabled;
			}

			static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
			unsigned long parent_rate)
			{
			struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
			if (s2mps11->enabled)
			return 32768;
			else
			return 0;
			}

			static struct clk_ops s2mps11_clk_ops = {
			.prepare = s2mps11_clk_prepare,
			.unprepare = s2mps11_clk_unprepare,
			.is_enabled = s2mps11_clk_is_enabled,
			.recalc_rate = s2mps11_clk_recalc_rate,
			};

			static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
			[S2MPS11_CLK_AP] = {
			.name = "s2mps11_ap",
			.ops = &s2mps11_clk_ops,
			.flags = CLK_IS_ROOT,
			},
			[S2MPS11_CLK_CP] = {
			.name = "s2mps11_cp",
			.ops = &s2mps11_clk_ops,
			.flags = CLK_IS_ROOT,
			},
			[S2MPS11_CLK_BT] = {
			.name = "s2mps11_bt",
			.ops = &s2mps11_clk_ops,
			.flags = CLK_IS_ROOT,
			},
			};

			static struct device_node s2mps11_clk_parse_dt(struct platform_device pdev)
			{
			struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
			struct device_node *clk_np;
			int i;

			if (!iodev->dev->of_node)
			return NULL;

			clk_np = of_find_node_by_name(iodev->dev->of_node, "clocks");
			if (!clk_np) {
			dev_err(&pdev->dev, "could not find clock sub-node\n");
			return ERR_PTR(-EINVAL);
			}

			clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk )
			S2MPS11_CLKS_NUM, GFP_KERNEL);
			if (!clk_table)
			return ERR_PTR(-ENOMEM);

			for (i = 0; i < S2MPS11_CLKS_NUM; i++)
			of_property_read_string_index(clk_np, "clock-output-names", i,
			&s2mps11_clks_init[i].name);

			return clk_np;
			}

			static int s2mps11_clk_probe(struct platform_device *pdev)
			{
			struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
			struct s2mps11_clk s2mps11_clks, s2mps11_clk;
			struct device_node *clk_np = NULL;
			int i, ret = 0;
			u32 val;

			s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(s2mps11_clk)
			S2MPS11_CLKS_NUM, GFP_KERNEL);
			if (!s2mps11_clks)
			return -ENOMEM;

			s2mps11_clk = s2mps11_clks;

			clk_np = s2mps11_clk_parse_dt(pdev);
			if (IS_ERR(clk_np))
			return PTR_ERR(clk_np);

			for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) {
			s2mps11_clk->iodev = iodev;
			s2mps11_clk->hw.init = &s2mps11_clks_init[i];
			s2mps11_clk->mask = 1 << i;

			ret = regmap_read(s2mps11_clk->iodev->regmap,
			S2MPS11_REG_RTC_CTRL, &val);
			if (ret < 0)
			goto err_reg;

			s2mps11_clk->enabled = val & s2mps11_clk->mask;

			s2mps11_clk->clk = devm_clk_register(&pdev->dev,
			&s2mps11_clk->hw);
			if (IS_ERR(s2mps11_clk->clk)) {
			dev_err(&pdev->dev, "Fail to register : %s\n",
			s2mps11_name(s2mps11_clk));
			ret = PTR_ERR(s2mps11_clk->clk);
			goto err_reg;
			}

			s2mps11_clk->lookup = devm_kzalloc(&pdev->dev,
			sizeof(struct clk_lookup), GFP_KERNEL);
			if (!s2mps11_clk->lookup) {
			ret = -ENOMEM;
			goto err_lup;
			}

			s2mps11_clk->lookup->con_id = s2mps11_name(s2mps11_clk);
			s2mps11_clk->lookup->clk = s2mps11_clk->clk;

			clkdev_add(s2mps11_clk->lookup);
			}

			if (clk_table) {
			for (i = 0; i < S2MPS11_CLKS_NUM; i++)
			clk_table[i] = s2mps11_clks[i].clk;

			clk_data.clks = clk_table;
			clk_data.clk_num = S2MPS11_CLKS_NUM;
			of_clk_add_provider(clk_np, of_clk_src_onecell_get, &clk_data);
			}

			platform_set_drvdata(pdev, s2mps11_clks);

			return ret;
			err_lup:
			devm_clk_unregister(&pdev->dev, s2mps11_clk->clk);
			err_reg:
			while (s2mps11_clk > s2mps11_clks) {
			if (s2mps11_clk->lookup) {
			clkdev_drop(s2mps11_clk->lookup);
			devm_clk_unregister(&pdev->dev, s2mps11_clk->clk);
			}
			s2mps11_clk--;
			}

			return ret;
			}

			static int s2mps11_clk_remove(struct platform_device *pdev)
			{
			struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
			int i;

			for (i = 0; i < S2MPS11_CLKS_NUM; i++)
			clkdev_drop(s2mps11_clks[i].lookup);

			return 0;
			}

			static const struct platform_device_id s2mps11_clk_id[] = {
			{ "s2mps11-clk", 0},
			{ },
			};
			MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);

			static struct platform_driver s2mps11_clk_driver = {
			.driver = {
			.name = "s2mps11-clk",
			.owner = THIS_MODULE,
			},
			.probe = s2mps11_clk_probe,
			.remove = s2mps11_clk_remove,
			.id_table = s2mps11_clk_id,
			};

			static int __init s2mps11_clk_init(void)
			{
			return platform_driver_register(&s2mps11_clk_driver);
			}
			subsys_initcall(s2mps11_clk_init);

			static void __init s2mps11_clk_cleanup(void)
			{
			platform_driver_unregister(&s2mps11_clk_driver);
			}
			module_exit(s2mps11_clk_cleanup);

			MODULE_DESCRIPTION("S2MPS11 Clock Driver");
			MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
			MODULE_LICENSE("GPL");