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author | Frank Oltmanns <frank@oltmanns.dev> | 2023-08-07 14:43:38 +0200 |
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committer | Chen-Yu Tsai <wens@csie.org> | 2023-08-09 23:33:58 +0800 |
commit | e373315d8ff839543132d2a0dcea546fda8b5048 (patch) | |
tree | d98c131b6da68f9639ec4f867103983874744ca7 /drivers/clk/sunxi-ng/ccu_common.h | |
parent | clk: sunxi-ng: Add feature to find closest rate (diff) | |
download | wireguard-linux-e373315d8ff839543132d2a0dcea546fda8b5048.tar.xz wireguard-linux-e373315d8ff839543132d2a0dcea546fda8b5048.zip |
clk: sunxi-ng: Add helper function to find closest rate
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>
Diffstat (limited to 'drivers/clk/sunxi-ng/ccu_common.h')
-rw-r--r-- | drivers/clk/sunxi-ng/ccu_common.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/clk/sunxi-ng/ccu_common.h b/drivers/clk/sunxi-ng/ccu_common.h index 5ad219f041d5..942a72c09437 100644 --- a/drivers/clk/sunxi-ng/ccu_common.h +++ b/drivers/clk/sunxi-ng/ccu_common.h @@ -53,6 +53,11 @@ struct sunxi_ccu_desc { void ccu_helper_wait_for_lock(struct ccu_common *common, u32 lock); +bool ccu_is_better_rate(struct ccu_common *common, + unsigned long target_rate, + unsigned long current_rate, + unsigned long best_rate); + struct ccu_pll_nb { struct notifier_block clk_nb; struct ccu_common *common; |