// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2018 Microchip Technology Inc, * Codrin Ciubotariu <codrin.ciubotariu@microchip.com> * * */ #include <linux/clk-provider.h> #include <linux/of.h> #include <linux/mfd/syscon.h> #include <linux/regmap.h> #include <linux/slab.h> #include <soc/at91/atmel-sfr.h> #include "pmc.h" struct clk_i2s_mux { struct clk_hw hw; struct regmap *regmap; u8 bus_id; }; #define to_clk_i2s_mux(hw) container_of(hw, struct clk_i2s_mux, hw) static u8 clk_i2s_mux_get_parent(struct clk_hw *hw) { struct clk_i2s_mux *mux = to_clk_i2s_mux(hw); u32 val; regmap_read(mux->regmap, AT91_SFR_I2SCLKSEL, &val); return (val & BIT(mux->bus_id)) >> mux->bus_id; } static int clk_i2s_mux_set_parent(struct clk_hw *hw, u8 index) { struct clk_i2s_mux *mux = to_clk_i2s_mux(hw); return regmap_update_bits(mux->regmap, AT91_SFR_I2SCLKSEL, BIT(mux->bus_id), index << mux->bus_id); } static const struct clk_ops clk_i2s_mux_ops = { .get_parent = clk_i2s_mux_get_parent, .set_parent = clk_i2s_mux_set_parent, .determine_rate = __clk_mux_determine_rate, }; struct clk_hw * __init at91_clk_i2s_mux_register(struct regmap *regmap, const char *name, const char * const *parent_names, unsigned int num_parents, u8 bus_id) { struct clk_init_data init = {}; struct clk_i2s_mux *i2s_ck; int ret; i2s_ck = kzalloc(sizeof(*i2s_ck), GFP_KERNEL); if (!i2s_ck) return ERR_PTR(-ENOMEM); init.name = name; init.ops = &clk_i2s_mux_ops; init.parent_names = parent_names; init.num_parents = num_parents; i2s_ck->hw.init = &init; i2s_ck->bus_id = bus_id; i2s_ck->regmap = regmap; ret = clk_hw_register(NULL, &i2s_ck->hw); if (ret) { kfree(i2s_ck); return ERR_PTR(ret); } return &i2s_ck->hw; }