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

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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>
This commit is contained in:
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;
};