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e373315d8f
The default behaviour of clocks in the sunxi-ng driver is to select a clock rate that is closest to but less than the requested rate. Add the ccu_is_better_rate() helper function that - depending on the fact if thc CCU_FEATURE_CLOSEST_RATE flag is set - decides if a rate is closer than another rate. Acked-by: Maxime Ripard <mripard@kernel.org> Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com> Signed-off-by: Frank Oltmanns <frank@oltmanns.dev> Link: https://lore.kernel.org/r/20230807-pll-mipi_set_rate_parent-v6-5-f173239a4b59@oltmanns.dev Signed-off-by: Chen-Yu Tsai <wens@csie.org>
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2016 Maxime Ripard. All rights reserved.
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*/
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#ifndef _COMMON_H_
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#define _COMMON_H_
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#include <linux/compiler.h>
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#include <linux/clk-provider.h>
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#define CCU_FEATURE_FRACTIONAL BIT(0)
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#define CCU_FEATURE_VARIABLE_PREDIV BIT(1)
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#define CCU_FEATURE_FIXED_PREDIV BIT(2)
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#define CCU_FEATURE_FIXED_POSTDIV BIT(3)
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#define CCU_FEATURE_ALL_PREDIV BIT(4)
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#define CCU_FEATURE_LOCK_REG BIT(5)
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#define CCU_FEATURE_MMC_TIMING_SWITCH BIT(6)
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#define CCU_FEATURE_SIGMA_DELTA_MOD BIT(7)
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#define CCU_FEATURE_KEY_FIELD BIT(8)
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#define CCU_FEATURE_CLOSEST_RATE BIT(9)
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/* MMC timing mode switch bit */
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#define CCU_MMC_NEW_TIMING_MODE BIT(30)
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struct device_node;
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struct ccu_common {
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void __iomem *base;
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u16 reg;
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u16 lock_reg;
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u32 prediv;
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unsigned long features;
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spinlock_t *lock;
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struct clk_hw hw;
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};
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static inline struct ccu_common *hw_to_ccu_common(struct clk_hw *hw)
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{
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return container_of(hw, struct ccu_common, hw);
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}
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struct sunxi_ccu_desc {
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struct ccu_common **ccu_clks;
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unsigned long num_ccu_clks;
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struct clk_hw_onecell_data *hw_clks;
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struct ccu_reset_map *resets;
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unsigned long num_resets;
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};
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void ccu_helper_wait_for_lock(struct ccu_common *common, u32 lock);
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bool ccu_is_better_rate(struct ccu_common *common,
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unsigned long target_rate,
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unsigned long current_rate,
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unsigned long best_rate);
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struct ccu_pll_nb {
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struct notifier_block clk_nb;
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struct ccu_common *common;
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u32 enable;
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u32 lock;
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};
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#define to_ccu_pll_nb(_nb) container_of(_nb, struct ccu_pll_nb, clk_nb)
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int ccu_pll_notifier_register(struct ccu_pll_nb *pll_nb);
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int devm_sunxi_ccu_probe(struct device *dev, void __iomem *reg,
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const struct sunxi_ccu_desc *desc);
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void of_sunxi_ccu_probe(struct device_node *node, void __iomem *reg,
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const struct sunxi_ccu_desc *desc);
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#endif /* _COMMON_H_ */
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