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