linux-kernel - [PATCH v3 6/8] clk: sunxi-ng: mux: Support finding closest rate

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Message-Id: <20230702-pll-mipi_set_rate_parent-v3-6-46dcb8aa9cbc@oltmanns.dev>
Date:   Sun, 02 Jul 2023 19:55:25 +0200
From:   Frank Oltmanns <frank@...manns.dev>
To:     Maxime Ripard <maxime@...no.tech>,
        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>,
        Andre Przywara <andre.przywara@....com>,
        Roman Beranek <me@...y.cz>
Cc:     linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Frank Oltmanns <frank@...manns.dev>
Subject: [PATCH v3 6/8] clk: sunxi-ng: mux: Support finding closest rate

When finding the best rate for a mux clock, consider rates that are
higher than the requested rate by introducing a new clk_ops structure
that uses the existing __clk_mux_determine_rate_closest function.
Furthermore introduce an initialization macro that uses this new
structure.

Signed-off-by: Frank Oltmanns <frank@...manns.dev>
---
 drivers/clk/sunxi-ng/ccu_mux.c | 13 +++++++++++++
 drivers/clk/sunxi-ng/ccu_mux.h | 17 +++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/clk/sunxi-ng/ccu_mux.c b/drivers/clk/sunxi-ng/ccu_mux.c
index 8594d6a4addd..49a592bdeacf 100644
--- a/drivers/clk/sunxi-ng/ccu_mux.c
+++ b/drivers/clk/sunxi-ng/ccu_mux.c
@@ -264,6 +264,19 @@ static unsigned long ccu_mux_recalc_rate(struct clk_hw *hw,
 					   parent_rate);
 }
 
+const struct clk_ops ccu_mux_closest_ops = {
+	.disable	= ccu_mux_disable,
+	.enable		= ccu_mux_enable,
+	.is_enabled	= ccu_mux_is_enabled,
+
+	.get_parent	= ccu_mux_get_parent,
+	.set_parent	= ccu_mux_set_parent,
+
+	.determine_rate	= __clk_mux_determine_rate_closest,
+	.recalc_rate	= ccu_mux_recalc_rate,
+};
+EXPORT_SYMBOL_NS_GPL(ccu_mux_closest_ops, SUNXI_CCU);
+
 const struct clk_ops ccu_mux_ops = {
 	.disable	= ccu_mux_disable,
 	.enable		= ccu_mux_enable,
diff --git a/drivers/clk/sunxi-ng/ccu_mux.h b/drivers/clk/sunxi-ng/ccu_mux.h
index 2c1811a445b0..c4ee14e43719 100644
--- a/drivers/clk/sunxi-ng/ccu_mux.h
+++ b/drivers/clk/sunxi-ng/ccu_mux.h
@@ -46,6 +46,22 @@ struct ccu_mux {
 	struct ccu_common	common;
 };
 
+#define SUNXI_CCU_MUX_TABLE_WITH_GATE_CLOSEST(_struct, _name, _parents, _table,	\
+				     _reg, _shift, _width, _gate,	\
+				     _flags)				\
+	struct ccu_mux _struct = {					\
+		.enable	= _gate,					\
+		.mux	= _SUNXI_CCU_MUX_TABLE(_shift, _width, _table),	\
+		.common	= {						\
+			.reg		= _reg,				\
+			.hw.init	= CLK_HW_INIT_PARENTS(_name,	\
+							      _parents, \
+							      &ccu_mux_closest_ops, \
+							      _flags),	\
+			.features	= CCU_FEATURE_CLOSEST_RATE,	\
+		}							\
+	}
+
 #define SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, _table,	\
 				     _reg, _shift, _width, _gate,	\
 				     _flags)				\
@@ -113,6 +129,7 @@ static inline struct ccu_mux *hw_to_ccu_mux(struct clk_hw *hw)
 }
 
 extern const struct clk_ops ccu_mux_ops;
+extern const struct clk_ops ccu_mux_closest_ops;
 
 unsigned long ccu_mux_helper_apply_prediv(struct ccu_common *common,
 					  struct ccu_mux_internal *cm,

-- 
2.41.0