// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* drivers/clk/at91/clk-slow.c
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*
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* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
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*/
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/clk/at91_pmc.h>
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#include <linux/of.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include "pmc.h"
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struct clk_sam9260_slow {
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struct clk_hw hw;
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struct regmap *regmap;
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};
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#define to_clk_sam9260_slow(hw) container_of(hw, struct clk_sam9260_slow, hw)
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static u8 clk_sam9260_slow_get_parent(struct clk_hw *hw)
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{
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struct clk_sam9260_slow *slowck = to_clk_sam9260_slow(hw);
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unsigned int status;
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regmap_read(slowck->regmap, AT91_PMC_SR, &status);
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return status & AT91_PMC_OSCSEL ? 1 : 0;
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}
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static const struct clk_ops sam9260_slow_ops = {
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.get_parent = clk_sam9260_slow_get_parent,
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};
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struct clk_hw * __init
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at91_clk_register_sam9260_slow(struct regmap *regmap,
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const char *name,
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const char **parent_names,
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int num_parents)
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{
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struct clk_sam9260_slow *slowck;
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struct clk_hw *hw;
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struct clk_init_data init;
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int ret;
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if (!name)
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return ERR_PTR(-EINVAL);
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if (!parent_names || !num_parents)
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return ERR_PTR(-EINVAL);
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slowck = kzalloc(sizeof(*slowck), GFP_KERNEL);
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if (!slowck)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &sam9260_slow_ops;
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init.parent_names = parent_names;
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init.num_parents = num_parents;
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init.flags = 0;
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slowck->hw.init = &init;
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slowck->regmap = regmap;
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hw = &slowck->hw;
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ret = clk_hw_register(NULL, &slowck->hw);
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if (ret) {
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kfree(slowck);
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hw = ERR_PTR(ret);
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}
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return hw;
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}
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