[PATCH 4/5] clk: sunxi-ng: nkmp: Add constraint for maximum rate
From: Jernej Skrabec <hidden>
Date: 2018-08-09 16:52:44
Also in:
linux-clk, lkml
Subsystem:
arm/allwinner sunxi soc support, common clk framework, the rest · Maintainers:
Chen-Yu Tsai, Jernej Skrabec, Samuel Holland, Michael Turquette, Stephen Boyd, Linus Torvalds
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 <redacted> --- 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; };
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2.18.0