Messages in this thread Patch in this message | | | From | Jernej Skrabec <> | Subject | [PATCH 4/5] clk: sunxi-ng: nkmp: Add constraint for maximum rate | Date | Thu, 9 Aug 2018 18:52:16 +0200 |
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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> --- drivers/clk/sunxi-ng/ccu_nkmp.c | 7 +++++++ drivers/clk/sunxi-ng/ccu_nkmp.h | 1 + 2 files changed, 8 insertions(+)
diff --git a/drivers/clk/sunxi-ng/ccu_nkmp.c b/drivers/clk/sunxi-ng/ccu_nkmp.c index ebd9436d2c7c..9b49adb20d07 100644 --- a/drivers/clk/sunxi-ng/ccu_nkmp.c +++ b/drivers/clk/sunxi-ng/ccu_nkmp.c @@ -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; diff --git a/drivers/clk/sunxi-ng/ccu_nkmp.h b/drivers/clk/sunxi-ng/ccu_nkmp.h index 6940503e7fc4..a9f8c116a745 100644 --- a/drivers/clk/sunxi-ng/ccu_nkmp.h +++ b/drivers/clk/sunxi-ng/ccu_nkmp.h @@ -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; }; -- 2.18.0
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