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76 lines
1.6 KiB
76 lines
1.6 KiB
// 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 <[email protected]> |
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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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