linux-kernel - [PATCH v3 09/15] clk: samsung: Keep CPU clock chip specific data in a dedicated struct

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Date: Sat, 24 Feb 2024 14:20:47 -0600
From: Sam Protsenko <semen.protsenko@...aro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>
Cc: Alim Akhtar <alim.akhtar@...sung.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 09/15] clk: samsung: Keep CPU clock chip specific data in a dedicated struct

Keep chip specific data in the data structure, don't mix it with code.
It makes it easier to add more chip specific data further. Having all
chip specific data in the table eliminates possible code bloat when
adding more rate handlers for new chips, and also makes it possible to
keep some other chip related data in that array.

No functional change.

Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
---
Changes in v3:
  - none

Changes in v2:
  - Improved the commit message: explained why it's beneficial for new
    chips to keep chip-specific data in one table

 drivers/clk/samsung/clk-cpu.c | 40 +++++++++++++++++++++++------------
 1 file changed, 26 insertions(+), 14 deletions(-)

diff --git a/drivers/clk/samsung/clk-cpu.c b/drivers/clk/samsung/clk-cpu.c
index 635ab8cc54a2..eb2b67d08f89 100644
--- a/drivers/clk/samsung/clk-cpu.c
+++ b/drivers/clk/samsung/clk-cpu.c
@@ -43,6 +43,16 @@ struct exynos_cpuclk;
 typedef int (*exynos_rate_change_fn_t)(struct clk_notifier_data *ndata,
 				       struct exynos_cpuclk *cpuclk);
 
+/**
+ * struct exynos_cpuclk_chip - Chip specific data for CPU clock
+ * @pre_rate_cb: callback to run before CPU clock rate change
+ * @post_rate_cb: callback to run after CPU clock rate change
+ */
+struct exynos_cpuclk_chip {
+	exynos_rate_change_fn_t	pre_rate_cb;
+	exynos_rate_change_fn_t	post_rate_cb;
+};
+
 /**
  * struct exynos_cpuclk - information about clock supplied to a CPU core
  * @hw:		handle between CCF and CPU clock
@@ -55,8 +65,7 @@ typedef int (*exynos_rate_change_fn_t)(struct clk_notifier_data *ndata,
  * @clk_nb:	clock notifier registered for changes in clock speed of the
  *		primary parent clock
  * @flags:	configuration flags for the CPU clock
- * @pre_rate_cb: callback to run before CPU clock rate change
- * @post_rate_cb: callback to run after CPU clock rate change
+ * @chip:	chip-specific data for the CPU clock
  *
  * This structure holds information required for programming the CPU clock for
  * various clock speeds.
@@ -70,9 +79,7 @@ struct exynos_cpuclk {
 	const unsigned long			num_cfgs;
 	struct notifier_block			clk_nb;
 	unsigned long				flags;
-
-	exynos_rate_change_fn_t			pre_rate_cb;
-	exynos_rate_change_fn_t			post_rate_cb;
+	const struct exynos_cpuclk_chip		*chip;
 };
 
 /* ---- Common code --------------------------------------------------------- */
@@ -420,13 +427,24 @@ static int exynos_cpuclk_notifier_cb(struct notifier_block *nb,
 	cpuclk = container_of(nb, struct exynos_cpuclk, clk_nb);
 
 	if (event == PRE_RATE_CHANGE)
-		err = cpuclk->pre_rate_cb(ndata, cpuclk);
+		err = cpuclk->chip->pre_rate_cb(ndata, cpuclk);
 	else if (event == POST_RATE_CHANGE)
-		err = cpuclk->post_rate_cb(ndata, cpuclk);
+		err = cpuclk->chip->post_rate_cb(ndata, cpuclk);
 
 	return notifier_from_errno(err);
 }
 
+static const struct exynos_cpuclk_chip exynos_clkcpu_chips[] = {
+	[CPUCLK_LAYOUT_E4210] = {
+		.pre_rate_cb	= exynos_cpuclk_pre_rate_change,
+		.post_rate_cb	= exynos_cpuclk_post_rate_change,
+	},
+	[CPUCLK_LAYOUT_E5433] = {
+		.pre_rate_cb	= exynos5433_cpuclk_pre_rate_change,
+		.post_rate_cb	= exynos5433_cpuclk_post_rate_change,
+	},
+};
+
 /* helper function to register a CPU clock */
 static int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
 				const struct samsung_cpu_clock *clk_data)
@@ -465,13 +483,7 @@ static int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
 	cpuclk->lock = &ctx->lock;
 	cpuclk->flags = clk_data->flags;
 	cpuclk->clk_nb.notifier_call = exynos_cpuclk_notifier_cb;
-	if (clk_data->reg_layout == CPUCLK_LAYOUT_E5433) {
-		cpuclk->pre_rate_cb = exynos5433_cpuclk_pre_rate_change;
-		cpuclk->post_rate_cb = exynos5433_cpuclk_post_rate_change;
-	} else {
-		cpuclk->pre_rate_cb = exynos_cpuclk_pre_rate_change;
-		cpuclk->post_rate_cb = exynos_cpuclk_post_rate_change;
-	}
+	cpuclk->chip = &exynos_clkcpu_chips[clk_data->reg_layout];
 
 	ret = clk_notifier_register(parent->clk, &cpuclk->clk_nb);
 	if (ret) {
-- 
2.39.2