linux-kernel - Re: [PATCH v2 3/5] coresight: cti: Use of_cpu_phandle_to

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Message-ID: <20250711102843.000003e6@huawei.com>
Date: Fri, 11 Jul 2025 10:28:43 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Alireza Sanaee <alireza.sanaee@...wei.com>
CC: <krzk@...nel.org>, <robh@...nel.org>, <coresight@...ts.linaro.org>,
	<devicetree@...r.kernel.org>, <dianders@...omium.org>,
	<james.clark@...aro.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>,
	<linuxarm@...wei.com>, <mark.rutland@....com>, <mike.leach@...aro.org>,
	<ruanjinjie@...wei.com>, <saravanak@...gle.com>,
	<shameerali.kolothum.thodi@...wei.com>, Suzuki K Poulose
	<suzuki.poulose@....com>
Subject: Re: [PATCH v2 3/5] coresight: cti: Use of_cpu_phandle_to_id for
 grabbing CPU id

On Tue, 8 Jul 2025 16:15:00 +0100
Alireza Sanaee <alireza.sanaee@...wei.com> wrote:

> Use the newly created API to grab CPU id.
> 
> Signed-off-by: Alireza Sanaee <alireza.sanaee@...wei.com>
> ---
>  .../hwtracing/coresight/coresight-cti-platform.c   | 14 +-------------
>  1 file changed, 1 insertion(+), 13 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-cti-platform.c b/drivers/hwtracing/coresight/coresight-cti-platform.c
> index d0ae10bf6128..e1dc559d54aa 100644
> --- a/drivers/hwtracing/coresight/coresight-cti-platform.c
> +++ b/drivers/hwtracing/coresight/coresight-cti-platform.c
> @@ -41,20 +41,8 @@
>   */
>  static int of_cti_get_cpu_at_node(const struct device_node *node)
>  {
> -	int cpu;
> -	struct device_node *dn;
> +	int cpu = of_cpu_phandle_to_id(node, NULL, 0);

Could do a single line - kind of down to coresight maintainers preference though!

	return (of_cpu_phandle_to_id(node, NULL, 0) < 0) ? -1; cpu;

+CC Suzuki (you got the two reviewers in the +CC but not the maintainer)


>  
> -	if (node == NULL)
> -		return -1;
> -
> -	dn = of_parse_phandle(node, "cpu", 0);
> -	/* CTI affinity defaults to no cpu */
> -	if (!dn)
> -		return -1;
> -	cpu = of_cpu_node_to_id(dn);
> -	of_node_put(dn);
> -
> -	/* No Affinity  if no cpu nodes are found */
>  	return (cpu < 0) ? -1 : cpu;
>  }
>