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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2018 Microchip Technology Inc,4 * Codrin Ciubotariu <codrin.ciubotariu@microchip.com>5 *6 *7 */8 9#include <linux/clk-provider.h>10#include <linux/of.h>11#include <linux/mfd/syscon.h>12#include <linux/regmap.h>13#include <linux/slab.h>14 15#include <soc/at91/atmel-sfr.h>16 17#include "pmc.h"18 19struct clk_i2s_mux {20 struct clk_hw hw;21 struct regmap *regmap;22 u8 bus_id;23};24 25#define to_clk_i2s_mux(hw) container_of(hw, struct clk_i2s_mux, hw)26 27static u8 clk_i2s_mux_get_parent(struct clk_hw *hw)28{29 struct clk_i2s_mux *mux = to_clk_i2s_mux(hw);30 u32 val;31 32 regmap_read(mux->regmap, AT91_SFR_I2SCLKSEL, &val);33 34 return (val & BIT(mux->bus_id)) >> mux->bus_id;35}36 37static int clk_i2s_mux_set_parent(struct clk_hw *hw, u8 index)38{39 struct clk_i2s_mux *mux = to_clk_i2s_mux(hw);40 41 return regmap_update_bits(mux->regmap, AT91_SFR_I2SCLKSEL,42 BIT(mux->bus_id), index << mux->bus_id);43}44 45static const struct clk_ops clk_i2s_mux_ops = {46 .get_parent = clk_i2s_mux_get_parent,47 .set_parent = clk_i2s_mux_set_parent,48 .determine_rate = __clk_mux_determine_rate,49};50 51struct clk_hw * __init52at91_clk_i2s_mux_register(struct regmap *regmap, const char *name,53 const char * const *parent_names,54 unsigned int num_parents, u8 bus_id)55{56 struct clk_init_data init = {};57 struct clk_i2s_mux *i2s_ck;58 int ret;59 60 i2s_ck = kzalloc(sizeof(*i2s_ck), GFP_KERNEL);61 if (!i2s_ck)62 return ERR_PTR(-ENOMEM);63 64 init.name = name;65 init.ops = &clk_i2s_mux_ops;66 init.parent_names = parent_names;67 init.num_parents = num_parents;68 69 i2s_ck->hw.init = &init;70 i2s_ck->bus_id = bus_id;71 i2s_ck->regmap = regmap;72 73 ret = clk_hw_register(NULL, &i2s_ck->hw);74 if (ret) {75 kfree(i2s_ck);76 return ERR_PTR(ret);77 }78 79 return &i2s_ck->hw;80}81