[PATCH v2 3/6] clk: sunxi-ng: nkm: Support minimum and maximum rate

Frank Oltmanns
2024-02-05T15:23:13Z

According to the Allwinner User Manual, the Allwinner A64 requires
PLL-MIPI to run at 500MHz-1.4GHz. Add support for that to ccu_nkm.

Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>
---
drivers/clk/sunxi-ng/ccu_nkm.c | 13 +++++++++++++
drivers/clk/sunxi-ng/ccu_nkm.h | 2 ++
2 files changed, 15 insertions(+)

diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
index 1168d894d636..7d135908d6e0 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.c
+++ b/drivers/clk/sunxi-ng/ccu_nkm.c
@@ -181,6 +181,12 @@ static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux,
if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
rate *= nkm->fixed_post_div;

+ if (nkm->min_rate && rate < nkm->min_rate)
+ rate = nkm->min_rate;
+
+ if (nkm->max_rate && rate > nkm->max_rate)
+ rate = nkm->max_rate;
+
if (!clk_hw_can_set_rate_parent(&nkm->common.hw))
rate = ccu_nkm_find_best(*parent_rate, rate, &_nkm, &nkm->common);
else
@@ -220,6 +226,13 @@ static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned long rate,
_nkm.min_m = 1;
_nkm.max_m = nkm->m.max ?: 1 << nkm->m.width;

+
+ if (nkm->min_rate && rate < nkm->min_rate)
+ rate = nkm->min_rate;
+
+ if (nkm->max_rate && rate > nkm->max_rate)
+ rate = nkm->max_rate;
+
ccu_nkm_find_best(parent_rate, rate, &_nkm, &nkm->common);

spin_lock_irqsave(nkm->common.lock, flags);
diff --git a/drivers/clk/sunxi-ng/ccu_nkm.h b/drivers/clk/sunxi-ng/ccu_nkm.h
index c409212ee40e..358a9df6b6a0 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.h
+++ b/drivers/clk/sunxi-ng/ccu_nkm.h
@@ -27,6 +27,8 @@ struct ccu_nkm {
struct ccu_mux_internal mux;

unsigned int fixed_post_div;
+ unsigned long min_rate;
+ unsigned long max_rate;
unsigned long max_m_n_ratio;
unsigned long min_parent_m_ratio;

--
2.43.0