[PATCH v2 03/15] clk: sunxi-ng: Add check for maximum rate to NKM PLLs
From: jagan@amarulasolutions.com (Jagan Teki)
Date: 2018-10-23 15:51:17
Also in:
dri-devel, linux-clk, linux-devicetree, 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 NKM PLLs, frequency can be set above PLL working range. Add a constraint for maximum supported rate. This way, drivers can specify which is maximum allowed rate for PLL. Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> --- Changes for v2: - new patch drivers/clk/sunxi-ng/ccu_nkm.c | 7 +++++++ drivers/clk/sunxi-ng/ccu_nkm.h | 1 + 2 files changed, 8 insertions(+)
diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
index d17539dc88dd..574fd2cd2a79 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.c
+++ b/drivers/clk/sunxi-ng/ccu_nkm.c@@ -132,6 +132,13 @@ static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux, return rate; } + if (nkm->max_rate && rate > nkm->max_rate) { + rate = nkm->max_rate; + if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV) + rate /= nkm->fixed_post_div; + return rate; + } + ccu_nkm_find_best(*parent_rate, rate, &_nkm); rate = *parent_rate * _nkm.n * _nkm.k / _nkm.m;
diff --git a/drivers/clk/sunxi-ng/ccu_nkm.h b/drivers/clk/sunxi-ng/ccu_nkm.h
index ff5bd00f429f..c82590481188 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.h
+++ b/drivers/clk/sunxi-ng/ccu_nkm.h@@ -36,6 +36,7 @@ struct ccu_nkm { unsigned int fixed_post_div; unsigned int min_rate; + unsigned int max_rate; struct ccu_common common; };
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2.18.0.321.gffc6fa0e3