[linux-sunxi] [PATCH v4 2/3] clk: sunxi-ng: nkm: add support for fixed post-divider

[Icenowy Zheng]

SATA PLL on Allwinner R40 is of type (parent) * N * K / M / 6 where 6 is
the fixed post-divider.

Add post-divider support for NKM type clock.

Signed-off-by: Icenowy Zheng <icen...@aosc.io>
---
 drivers/clk/sunxi-ng/ccu_nkm.c | 22 +++++++++++++++++++---
 drivers/clk/sunxi-ng/ccu_nkm.h |  2 ++
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
index 44b16dc8fea6..ce7f03737ad5 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.c
+++ b/drivers/clk/sunxi-ng/ccu_nkm.c
@@ -75,7 +75,7 @@ static unsigned long ccu_nkm_recalc_rate(struct clk_hw *hw,
                                        unsigned long parent_rate)
 {
        struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
-       unsigned long n, m, k;
+       unsigned long n, m, k, rate;
        u32 reg;
 
        reg = readl(nkm->common.base + nkm->common.reg);
@@ -98,7 +98,12 @@ static unsigned long ccu_nkm_recalc_rate(struct clk_hw *hw,
        if (!m)
                m++;
 
-       return parent_rate * n  * k / m;
+       rate = parent_rate * n  * k / m;
+
+       if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
+               rate /= nkm->fixed_post_div;
+
+       return rate;
 }
 
 static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux,
@@ -117,9 +122,17 @@ static unsigned long ccu_nkm_round_rate(struct 
ccu_mux_internal *mux,
        _nkm.min_m = 1;
        _nkm.max_m = nkm->m.max ?: 1 << nkm->m.width;
 
+       if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
+               rate *= nkm->fixed_post_div;
+
        ccu_nkm_find_best(*parent_rate, rate, &_nkm);
 
-       return *parent_rate * _nkm.n * _nkm.k / _nkm.m;
+       rate = *parent_rate * _nkm.n * _nkm.k / _nkm.m;
+
+       if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
+               rate /= nkm->fixed_post_div;
+
+       return rate;
 }
 
 static int ccu_nkm_determine_rate(struct clk_hw *hw,
@@ -139,6 +152,9 @@ static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned 
long rate,
        unsigned long flags;
        u32 reg;
 
+       if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
+               rate /= nkm->fixed_post_div;
+
        _nkm.min_n = nkm->n.min ?: 1;
        _nkm.max_n = nkm->n.max ?: 1 << nkm->n.width;
        _nkm.min_k = nkm->k.min ?: 1;
diff --git a/drivers/clk/sunxi-ng/ccu_nkm.h b/drivers/clk/sunxi-ng/ccu_nkm.h
index 34580894f4d1..cc6efb70a102 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.h
+++ b/drivers/clk/sunxi-ng/ccu_nkm.h
@@ -34,6 +34,8 @@ struct ccu_nkm {
        struct ccu_div_internal         m;
        struct ccu_mux_internal mux;
 
+       unsigned int            fixed_post_div;
+
        struct ccu_common       common;
 };
 
-- 
2.13.0

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