linux-kernel - [PATCH 2/3] clk: mvebu: Use of_get_cpu

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Date:   Mon, 27 Mar 2023 13:43:19 -0500
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 2/3] clk: mvebu: Use of_get_cpu_hwid() to read CPU ID

Use of_get_cpu_hwid() rather than the open coded reading of the CPU
nodes "reg" property. The existing code is in fact wrong as the "reg"
address cells size is 2 cells for arm64. The existing code happens to
work because the DTS files are wrong as well.

Signed-off-by: Rob Herring <robh@...nel.org>
---
Note this should be marked for stable so that if/when the DTS files are
fixed, then at least stable kernels will work. This is untested, so I
didn't mark for stable.
---
 drivers/clk/mvebu/ap-cpu-clk.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/clk/mvebu/ap-cpu-clk.c b/drivers/clk/mvebu/ap-cpu-clk.c
index 71bdd7c3ff03..d8a7a4c90d54 100644
--- a/drivers/clk/mvebu/ap-cpu-clk.c
+++ b/drivers/clk/mvebu/ap-cpu-clk.c
@@ -253,12 +253,12 @@ static int ap_cpu_clock_probe(struct platform_device *pdev)
 	 */
 	nclusters = 1;
 	for_each_of_cpu_node(dn) {
-		int cpu, err;
+		u64 cpu;
 
-		err = of_property_read_u32(dn, "reg", &cpu);
-		if (WARN_ON(err)) {
+		cpu = of_get_cpu_hwid(dn, 0);
+		if (WARN_ON(cpu == OF_BAD_ADDR)) {
 			of_node_put(dn);
-			return err;
+			return -EINVAL;
 		}
 
 		/* If cpu2 or cpu3 is enabled */
@@ -288,12 +288,12 @@ static int ap_cpu_clock_probe(struct platform_device *pdev)
 		struct clk_init_data init;
 		const char *parent_name;
 		struct clk *parent;
-		int cpu, err;
+		u64 cpu;
 
-		err = of_property_read_u32(dn, "reg", &cpu);
-		if (WARN_ON(err)) {
+		cpu = of_get_cpu_hwid(dn, 0);
+		if (WARN_ON(cpu == OF_BAD_ADDR)) {
 			of_node_put(dn);
-			return err;
+			return -EINVAL;
 		}
 
 		cluster_index = cpu & APN806_CLUSTER_NUM_MASK;

-- 
2.39.2