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

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Date: Mon, 05 Feb 2024 16:22:26 +0100
From: Frank Oltmanns <frank@...manns.dev>
To: Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Chen-Yu Tsai <wens@...e.org>, 
 Jernej Skrabec <jernej.skrabec@...il.com>, 
 Samuel Holland <samuel@...lland.org>, 
 Guido Günther <agx@...xcpu.org>, 
 Purism Kernel Team <kernel@...i.sm>, Ondrej Jirman <megi@....cz>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 Frank Oltmanns <frank@...manns.dev>
Subject: [PATCH v2 3/6] clk: sunxi-ng: nkm: Support minimum and maximum
 rate

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@...manns.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