/* * Clkout driver for Rockchip RK808 * * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd * * Author:Chris Zhong <zyw@rock-chips.com> * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope 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. */ #include <linux/clk.h> #include <linux/clk-provider.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/platform_device.h> #include <linux/mfd/rk808.h> #include <linux/i2c.h> #define RK808_NR_OUTPUT 2 struct rk808_clkout { struct rk808 *rk808; struct clk_onecell_data clk_data; struct clk_hw clkout1_hw; struct clk_hw clkout2_hw; }; static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { return 32768; } static int rk808_clkout2_enable(struct clk_hw *hw, bool enable) { struct rk808_clkout *rk808_clkout = container_of(hw, struct rk808_clkout, clkout2_hw); struct rk808 *rk808 = rk808_clkout->rk808; return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG, CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0); } static int rk808_clkout2_prepare(struct clk_hw *hw) { return rk808_clkout2_enable(hw, true); } static void rk808_clkout2_unprepare(struct clk_hw *hw) { rk808_clkout2_enable(hw, false); } static int rk808_clkout2_is_prepared(struct clk_hw *hw) { struct rk808_clkout *rk808_clkout = container_of(hw, struct rk808_clkout, clkout2_hw); struct rk808 *rk808 = rk808_clkout->rk808; uint32_t val; int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val); if (ret < 0) return ret; return (val & CLK32KOUT2_EN) ? 1 : 0; } static const struct clk_ops rk808_clkout1_ops = { .recalc_rate = rk808_clkout_recalc_rate, }; static const struct clk_ops rk808_clkout2_ops = { .prepare = rk808_clkout2_prepare, .unprepare = rk808_clkout2_unprepare, .is_prepared = rk808_clkout2_is_prepared, .recalc_rate = rk808_clkout_recalc_rate, }; static int rk808_clkout_probe(struct platform_device *pdev) { struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent); struct i2c_client *client = rk808->i2c; struct device_node *node = client->dev.of_node; struct clk_init_data init = {}; struct clk **clk_table; struct rk808_clkout *rk808_clkout; rk808_clkout = devm_kzalloc(&client->dev, sizeof(*rk808_clkout), GFP_KERNEL); if (!rk808_clkout) return -ENOMEM; rk808_clkout->rk808 = rk808; clk_table = devm_kcalloc(&client->dev, RK808_NR_OUTPUT, sizeof(struct clk *), GFP_KERNEL); if (!clk_table) return -ENOMEM; init.flags = CLK_IS_ROOT; init.parent_names = NULL; init.num_parents = 0; init.name = "rk808-clkout1"; init.ops = &rk808_clkout1_ops; rk808_clkout->clkout1_hw.init = &init; /* optional override of the clockname */ of_property_read_string_index(node, "clock-output-names", 0, &init.name); clk_table[0] = devm_clk_register(&client->dev, &rk808_clkout->clkout1_hw); if (IS_ERR(clk_table[0])) return PTR_ERR(clk_table[0]); init.name = "rk808-clkout2"; init.ops = &rk808_clkout2_ops; rk808_clkout->clkout2_hw.init = &init; /* optional override of the clockname */ of_property_read_string_index(node, "clock-output-names", 1, &init.name); clk_table[1] = devm_clk_register(&client->dev, &rk808_clkout->clkout2_hw); if (IS_ERR(clk_table[1])) return PTR_ERR(clk_table[1]); rk808_clkout->clk_data.clks = clk_table; rk808_clkout->clk_data.clk_num = RK808_NR_OUTPUT; return of_clk_add_provider(node, of_clk_src_onecell_get, &rk808_clkout->clk_data); } static int rk808_clkout_remove(struct platform_device *pdev) { struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent); struct i2c_client *client = rk808->i2c; struct device_node *node = client->dev.of_node; of_clk_del_provider(node); return 0; } static struct platform_driver rk808_clkout_driver = { .probe = rk808_clkout_probe, .remove = rk808_clkout_remove, .driver = { .name = "rk808-clkout", }, }; module_platform_driver(rk808_clkout_driver); MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs"); MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:rk808-clkout");