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clk: sunxi-ng: nkmp: Add constraint for maximum rate 

Some, if not most, NKMP PLLs can be set to higher rate that is really
supported by HW.

Implement support for maximum frequency constrain for NKMP PLLs.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
hifive-unleashed-5.1
Jernej Skrabec 2018-08-09 18:52:16 +02:00 committed by Maxime Ripard
parent b16fb66915
commit a8e5433cdc
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GPG Key ID: D2B4C094214DAF74
2 changed files with 8 additions and 0 deletions
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7
drivers/clk/sunxi-ng/ccu_nkmp.c
View File

@ -137,6 +137,13 @@ static long ccu_nkmp_round_rate(struct clk_hw *hw, unsigned long rate,
if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
rate *= nkmp->fixed_post_div;
if (nkmp->max_rate && rate > nkmp->max_rate) {
rate = nkmp->max_rate;
if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
rate /= nkmp->fixed_post_div;
return rate;
}
_nkmp.min_n = nkmp->n.min ?: 1;
_nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width;
_nkmp.min_k = nkmp->k.min ?: 1;

1
drivers/clk/sunxi-ng/ccu_nkmp.h
View File

@ -35,6 +35,7 @@ struct ccu_nkmp {
struct ccu_div_internal p;
unsigned int fixed_post_div;
unsigned int max_rate;
struct ccu_common common;
};