linux-kernel - [PATCH v2 1/3] clk: samsung: introduce nMUX for MUX clks that can reparented

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Date: Tue, 26 Mar 2024 17:28:11 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: peter.griffin@...aro.org,
	krzysztof.kozlowski@...aro.org
Cc: alim.akhtar@...sung.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	andre.draszik@...aro.org,
	willmcvicker@...gle.com,
	kernel-team@...roid.com,
	s.nawrocki@...sung.com,
	cw00.choi@...sung.com,
	mturquette@...libre.com,
	sboyd@...nel.org,
	semen.protsenko@...aro.org,
	linux-clk@...r.kernel.org,
	jaewon02.kim@...sung.com,
	Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH v2 1/3] clk: samsung: introduce nMUX for MUX clks that can reparented

All samsung MUX clocks that are defined with MUX() set the
CLK_SET_RATE_NO_REPARENT flag in __MUX(), which prevents MUXes to be
reparented during clk_set_rate().

Introduce nMUX() for MUX clocks that can be reparented. One user of
nMUX() will be GS101. GS101 defines MUX clocks that are dedicated for
each instance of an IP (see MUX USI). The reparenting of these MUX clocks
will not affect other instances of the same IP or different IPs
altogether.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 drivers/clk/samsung/clk.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/clk/samsung/clk.h b/drivers/clk/samsung/clk.h
index a70bd7cce39f..01f58b7686db 100644
--- a/drivers/clk/samsung/clk.h
+++ b/drivers/clk/samsung/clk.h
@@ -146,6 +146,26 @@ struct samsung_mux_clock {
 #define MUX_F(_id, cname, pnames, o, s, w, f, mf)		\
 	__MUX(_id, cname, pnames, o, s, w, f, mf)
 
+/* Used by MUX clocks where reparenting is allowed. */
+#define __nMUX(_id, cname, pnames, o, s, w, f, mf)		\
+	{							\
+		.id		= _id,				\
+		.name		= cname,			\
+		.parent_names	= pnames,			\
+		.num_parents	= ARRAY_SIZE(pnames),		\
+		.flags		= f,				\
+		.offset		= o,				\
+		.shift		= s,				\
+		.width		= w,				\
+		.mux_flags	= mf,				\
+	}
+
+#define nMUX(_id, cname, pnames, o, s, w)			\
+	__nMUX(_id, cname, pnames, o, s, w, 0, 0)
+
+#define nMUX_F(_id, cname, pnames, o, s, w, f, mf)		\
+	__nMUX(_id, cname, pnames, o, s, w, f, mf)
+
 /**
  * struct samsung_div_clock - information about div clock
  * @id: platform specific id of the clock
-- 
2.44.0.396.g6e790dbe36-goog