linux-kernel - [PATCH 1/2] clocksource: exynos_mct: Refactor resources allocation

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Message-Id: <20211101193531.15078-2-semen.protsenko@linaro.org>
Date:   Mon,  1 Nov 2021 21:35:30 +0200
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org
Subject: [PATCH 1/2] clocksource: exynos_mct: Refactor resources allocation

From: Marek Szyprowski <m.szyprowski@...sung.com>

Move interrupts allocation from exynos4_timer_resources() into separate
function together with the interrupt number parsing code from
mct_init_dt(), so the code for managing interrupts is kept together.
While touching exynos4_timer_resources() function, move of_iomap() to it.
No functional changes.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
Tested-by: Chanwoo Choi <cw00.choi@...sung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
---
 drivers/clocksource/exynos_mct.c | 50 +++++++++++++++++++-------------
 1 file changed, 30 insertions(+), 20 deletions(-)

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 5e3e96d3d1b9..857cf12ebe57 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -504,11 +504,14 @@ static int exynos4_mct_dying_cpu(unsigned int cpu)
 	return 0;
 }
 
-static int __init exynos4_timer_resources(struct device_node *np, void __iomem *base)
+static int __init exynos4_timer_resources(struct device_node *np)
 {
-	int err, cpu;
 	struct clk *mct_clk, *tick_clk;
 
+	reg_base = of_iomap(np, 0);
+	if (!reg_base)
+		panic("%s: unable to ioremap mct address space\n", __func__);
+
 	tick_clk = of_clk_get_by_name(np, "fin_pll");
 	if (IS_ERR(tick_clk))
 		panic("%s: unable to determine tick clock rate\n", __func__);
@@ -519,9 +522,27 @@ static int __init exynos4_timer_resources(struct device_node *np, void __iomem *
 		panic("%s: unable to retrieve mct clock instance\n", __func__);
 	clk_prepare_enable(mct_clk);
 
-	reg_base = base;
-	if (!reg_base)
-		panic("%s: unable to ioremap mct address space\n", __func__);
+	return 0;
+}
+
+static int __init exynos4_timer_interrupts(struct device_node *np,
+					   unsigned int int_type)
+{
+	int nr_irqs, i, err, cpu;
+
+	mct_int_type = int_type;
+
+	/* This driver uses only one global timer interrupt */
+	mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);
+
+	/*
+	 * Find out the number of local irqs specified. The local
+	 * timer irqs are specified after the four global timer
+	 * irqs are specified.
+	 */
+	nr_irqs = of_irq_count(np);
+	for (i = MCT_L0_IRQ; i < nr_irqs; i++)
+		mct_irqs[i] = irq_of_parse_and_map(np, i);
 
 	if (mct_int_type == MCT_INT_PPI) {
 
@@ -581,24 +602,13 @@ static int __init exynos4_timer_resources(struct device_node *np, void __iomem *
 
 static int __init mct_init_dt(struct device_node *np, unsigned int int_type)
 {
-	u32 nr_irqs, i;
 	int ret;
 
-	mct_int_type = int_type;
-
-	/* This driver uses only one global timer interrupt */
-	mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);
-
-	/*
-	 * Find out the number of local irqs specified. The local
-	 * timer irqs are specified after the four global timer
-	 * irqs are specified.
-	 */
-	nr_irqs = of_irq_count(np);
-	for (i = MCT_L0_IRQ; i < nr_irqs; i++)
-		mct_irqs[i] = irq_of_parse_and_map(np, i);
+	ret = exynos4_timer_resources(np);
+	if (ret)
+		return ret;
 
-	ret = exynos4_timer_resources(np, of_iomap(np, 0));
+	ret = exynos4_timer_interrupts(np, int_type);
 	if (ret)
 		return ret;
 
-- 
2.30.2