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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/clk/spear/clk.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | drivers/clk/spear/clk.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/clk/spear/clk.c b/drivers/clk/spear/clk.c new file mode 100644 index 000000000..50847cccd --- /dev/null +++ b/drivers/clk/spear/clk.c @@ -0,0 +1,36 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2012 ST Microelectronics + * Viresh Kumar <vireshk@kernel.org> + * + * SPEAr clk - Common routines + */ + +#include <linux/clk-provider.h> +#include <linux/types.h> +#include "clk.h" + +long clk_round_rate_index(struct clk_hw *hw, unsigned long drate, + unsigned long parent_rate, clk_calc_rate calc_rate, u8 rtbl_cnt, + int *index) +{ + unsigned long prev_rate, rate = 0; + + for (*index = 0; *index < rtbl_cnt; (*index)++) { + prev_rate = rate; + rate = calc_rate(hw, parent_rate, *index); + if (drate < rate) { + /* previous clock was best */ + if (*index) { + rate = prev_rate; + (*index)--; + } + break; + } + } + + if ((*index) == rtbl_cnt) + (*index)--; + + return rate; +} |