linux-kernel - Re: [PATCH v2] cpufreq: qcom-hw: Simplify counting frequency domains

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Date:   Wed, 22 Feb 2023 19:27:30 -0800
From:   Bjorn Andersson <andersson@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, agross@...nel.org,
        marijn.suijten@...ainline.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] cpufreq: qcom-hw: Simplify counting frequency domains

On Thu, Feb 16, 2023 at 11:51:40AM +0100, Konrad Dybcio wrote:
> For quite some time, this driver has been performing some quite
> low-level DT operations. Simplify that using platform_get_resource.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Reviewed-by: Bjorn Andersson <andersson@...nel.org>

Regards,
Bjorn

> ---
> v1 -> v2:
> - remove stray newline near probe return
> - s/doing performing/performing/
> 
> v1: https://lore.kernel.org/linux-arm-msm/20230216102956.3933639-1-konrad.dybcio@linaro.org/T/#u
> 
>  drivers/cpufreq/qcom-cpufreq-hw.c | 29 ++++++-----------------------
>  1 file changed, 6 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
> index 2f581d2d617d..575a4461c25a 100644
> --- a/drivers/cpufreq/qcom-cpufreq-hw.c
> +++ b/drivers/cpufreq/qcom-cpufreq-hw.c
> @@ -29,6 +29,8 @@
>  
>  #define GT_IRQ_STATUS			BIT(2)
>  
> +#define MAX_FREQ_DOMAINS		3
> +
>  struct qcom_cpufreq_soc_data {
>  	u32 reg_enable;
>  	u32 reg_domain_state;
> @@ -651,10 +653,9 @@ static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)
>  {
>  	struct clk_hw_onecell_data *clk_data;
>  	struct device *dev = &pdev->dev;
> -	struct device_node *soc_node;
>  	struct device *cpu_dev;
>  	struct clk *clk;
> -	int ret, i, num_domains, reg_sz;
> +	int ret, i, num_domains;
>  
>  	clk = clk_get(dev, "xo");
>  	if (IS_ERR(clk))
> @@ -681,24 +682,9 @@ static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> -	/* Allocate qcom_cpufreq_data based on the available frequency domains in DT */
> -	soc_node = of_get_parent(dev->of_node);
> -	if (!soc_node)
> -		return -EINVAL;
> -
> -	ret = of_property_read_u32(soc_node, "#address-cells", &reg_sz);
> -	if (ret)
> -		goto of_exit;
> -
> -	ret = of_property_read_u32(soc_node, "#size-cells", &i);
> -	if (ret)
> -		goto of_exit;
> -
> -	reg_sz += i;
> -
> -	num_domains = of_property_count_elems_of_size(dev->of_node, "reg", sizeof(u32) * reg_sz);
> -	if (num_domains <= 0)
> -		return num_domains;
> +	for (num_domains = 0; num_domains < MAX_FREQ_DOMAINS; num_domains++)
> +		if (!platform_get_resource(pdev, IORESOURCE_MEM, num_domains))
> +			break;
>  
>  	qcom_cpufreq.data = devm_kzalloc(dev, sizeof(struct qcom_cpufreq_data) * num_domains,
>  					 GFP_KERNEL);
> @@ -762,9 +748,6 @@ static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)
>  	else
>  		dev_dbg(dev, "QCOM CPUFreq HW driver initialized\n");
>  
> -of_exit:
> -	of_node_put(soc_node);
> -
>  	return ret;
>  }
>  
> -- 
> 2.39.1
>