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git.ipfire.org Git - people/ms/u-boot.git/blob - arch/arm/include/asm/arch-rockchip/clock.h
2 * (C) Copyright 2015 Google, Inc
4 * SPDX-License-Identifier: GPL-2.0
7 #ifndef _ASM_ARCH_CLOCK_H
8 #define _ASM_ARCH_CLOCK_H
11 #define RKCLK_PLL_MODE_SLOW 0
12 #define RKCLK_PLL_MODE_NORMAL 1
21 /* Standard Rockchip clock numbers */
33 static inline int rk_pll_id(enum rk_clk_id clk_id
)
39 * clk_get_divisor() - Calculate the required clock divisior
41 * Given an input rate and a required output_rate, calculate the Rockchip
42 * divisor needed to achieve this.
44 * @input_rate: Input clock rate in Hz
45 * @output_rate: Output clock rate in Hz
46 * @return divisor register value to use
48 static inline u32
clk_get_divisor(ulong input_rate
, uint output_rate
)
52 clk_div
= input_rate
/ output_rate
;
53 clk_div
= (clk_div
+ 1) & 0xfffe;
59 * rockchip_get_cru() - get a pointer to the clock/reset unit registers
61 * @return pointer to registers, or -ve error on error
63 void *rockchip_get_cru(void);
66 * rkclk_get_clk() - get a pointer to a given clock
68 * This is an internal function - use outside the clock subsystem indicates
69 * that work is needed!
71 * @clk_id: Clock requested
72 * @devp: Returns a pointer to that clock
73 * @return 0 if OK, -ve on error
75 int rkclk_get_clk(enum rk_clk_id clk_id
, struct udevice
**devp
);
80 void rkclk_configure_cpu(struct rk3288_cru
*cru
, struct rk3288_grf
*grf
);