1 // SPDX-License-Identifier: GPL-2.0 2 /* 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 19 struct 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 27 static 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 37 static 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 45 static 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 51 struct clk_hw * __init 52 at91_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