From: Jernej Skrabec Date: Thu, 9 Aug 2018 16:52:16 +0000 (+0200) Subject: clk: sunxi-ng: nkmp: Add constraint for maximum rate X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a8e5433cdc500290b52d26a05056e02c448a413c;p=linux.git 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 Signed-off-by: Maxime Ripard --- diff --git a/drivers/clk/sunxi-ng/ccu_nkmp.c b/drivers/clk/sunxi-ng/ccu_nkmp.c index ebd9436d2c7cd..9b49adb20d07c 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 6940503e7fc46..a9f8c116a7453 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; };