linux-kernel - [PATCH v2 3/4] clk: mvebu: Iterate over possible CPUs instead of DT CPU nodes

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Message-Id: <20230327-mvebu-clk-fixes-v2-3-8333729ee45d@kernel.org>
Date:   Fri, 09 Jun 2023 12:13:47 -0600
From:   Rob Herring <robh@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org
Subject: [PATCH v2 3/4] clk: mvebu: Iterate over possible CPUs instead of
 DT CPU nodes

Rework iterating over DT CPU nodes to iterate over possible CPUs
instead. There's no need to walk the DT CPU nodes again. Possible CPUs
is equal to the number of CPUs defined in the DT. Using the "reg" value
for an array index is fragile as it assumes "reg" is 0-N which often is
not the case.

Signed-off-by: Rob Herring <robh@...nel.org>
---
 drivers/clk/mvebu/clk-cpu.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/clk/mvebu/clk-cpu.c b/drivers/clk/mvebu/clk-cpu.c
index c2af3395cf13..db2b38c21304 100644
--- a/drivers/clk/mvebu/clk-cpu.c
+++ b/drivers/clk/mvebu/clk-cpu.c
@@ -168,8 +168,8 @@ static void __init of_cpu_clk_setup(struct device_node *node)
 	struct cpu_clk *cpuclk;
 	void __iomem *clock_complex_base = of_iomap(node, 0);
 	void __iomem *pmu_dfs_base = of_iomap(node, 1);
-	int ncpus = 0;
-	struct device_node *dn;
+	int ncpus = num_possible_cpus();
+	int cpu;
 
 	if (clock_complex_base == NULL) {
 		pr_err("%s: clock-complex base register not set\n",
@@ -181,9 +181,6 @@ static void __init of_cpu_clk_setup(struct device_node *node)
 		pr_warn("%s: pmu-dfs base register not set, dynamic frequency scaling not available\n",
 			__func__);
 
-	for_each_of_cpu_node(dn)
-		ncpus++;
-
 	cpuclk = kcalloc(ncpus, sizeof(*cpuclk), GFP_KERNEL);
 	if (WARN_ON(!cpuclk))
 		goto cpuclk_out;
@@ -192,19 +189,14 @@ static void __init of_cpu_clk_setup(struct device_node *node)
 	if (WARN_ON(!clks))
 		goto clks_out;
 
-	for_each_of_cpu_node(dn) {
+	for_each_possible_cpu(cpu) {
 		struct clk_init_data init;
 		struct clk *clk;
 		char *clk_name = kzalloc(5, GFP_KERNEL);
-		int cpu, err;
 
 		if (WARN_ON(!clk_name))
 			goto bail_out;
 
-		err = of_property_read_u32(dn, "reg", &cpu);
-		if (WARN_ON(err))
-			goto bail_out;
-
 		sprintf(clk_name, "cpu%d", cpu);
 
 		cpuclk[cpu].parent_name = of_clk_get_parent_name(node, 0);

-- 
2.39.2