diff mbox series

[v4,2/6] cpufreq: qcom-nvmem: create L2 cache device

Message ID 20230827032803.934819-3-dmitry.baryshkov@linaro.org (mailing list archive)
State Handled Elsewhere, archived
Headers show
Series cpufreq: qcom-nvmem: support apq8064 cpufreq scaling | expand

Commit Message

Dmitry Baryshkov Aug. 27, 2023, 3:27 a.m. UTC
Scaling the frequencies on some of Qualcomm Krait platforms (e.g.
APQ8064) also requires scaling of the L2 cache frequency. As the
l2-cache device node is places under /cpus/ path, it is not created by
default by the OF code. Create corresponding device here.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/cpufreq/qcom-cpufreq-nvmem.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

Comments

Konrad Dybcio Aug. 28, 2023, 11:07 a.m. UTC | #1
On 27.08.2023 05:27, Dmitry Baryshkov wrote:
> Scaling the frequencies on some of Qualcomm Krait platforms (e.g.
> APQ8064) also requires scaling of the L2 cache frequency. As the
> l2-cache device node is places under /cpus/ path, it is not created by
> default by the OF code. Create corresponding device here.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>  drivers/cpufreq/qcom-cpufreq-nvmem.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/cpufreq/qcom-cpufreq-nvmem.c b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> index 84d7033e5efe..f4c196ba4432 100644
> --- a/drivers/cpufreq/qcom-cpufreq-nvmem.c
> +++ b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> @@ -22,6 +22,7 @@
>  #include <linux/module.h>
>  #include <linux/nvmem-consumer.h>
>  #include <linux/of.h>
> +#include <linux/of_platform.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_domain.h>
>  #include <linux/pm_opp.h>
> @@ -377,6 +378,7 @@ static int __init qcom_cpufreq_init(void)
>  {
>  	struct device_node *np = of_find_node_by_path("/");
>  	const struct of_device_id *match;
> +	unsigned int cpu;
>  	int ret;
>  
>  	if (!np)
> @@ -387,6 +389,25 @@ static int __init qcom_cpufreq_init(void)
>  	if (!match)
>  		return -ENODEV;
>  
> +	for_each_possible_cpu(cpu) {
> +		struct device *dev = get_cpu_device(cpu);
> +		struct device_node *cache;
> +		struct platform_device *pdev;
Aaaalmost reverse-Christmas-tree :D

> +
> +		cache = of_find_next_cache_node(dev->of_node);
> +		if (!cache)
> +			continue;
> +
> +		if (of_device_is_compatible(cache, "qcom,krait-l2-cache")) {
> +			pdev = of_platform_device_create(cache, NULL, NULL);
> +			if (IS_ERR(pdev))
> +				pr_err("%s: %pe, failed to create L2 cache node\n", __func__, pdev);
The return value should be null-checked instead


> +			/* the error is not fatal */
"This error"?

Konrad
diff mbox series

Patch

diff --git a/drivers/cpufreq/qcom-cpufreq-nvmem.c b/drivers/cpufreq/qcom-cpufreq-nvmem.c
index 84d7033e5efe..f4c196ba4432 100644
--- a/drivers/cpufreq/qcom-cpufreq-nvmem.c
+++ b/drivers/cpufreq/qcom-cpufreq-nvmem.c
@@ -22,6 +22,7 @@ 
 #include <linux/module.h>
 #include <linux/nvmem-consumer.h>
 #include <linux/of.h>
+#include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_opp.h>
@@ -377,6 +378,7 @@  static int __init qcom_cpufreq_init(void)
 {
 	struct device_node *np = of_find_node_by_path("/");
 	const struct of_device_id *match;
+	unsigned int cpu;
 	int ret;
 
 	if (!np)
@@ -387,6 +389,25 @@  static int __init qcom_cpufreq_init(void)
 	if (!match)
 		return -ENODEV;
 
+	for_each_possible_cpu(cpu) {
+		struct device *dev = get_cpu_device(cpu);
+		struct device_node *cache;
+		struct platform_device *pdev;
+
+		cache = of_find_next_cache_node(dev->of_node);
+		if (!cache)
+			continue;
+
+		if (of_device_is_compatible(cache, "qcom,krait-l2-cache")) {
+			pdev = of_platform_device_create(cache, NULL, NULL);
+			if (IS_ERR(pdev))
+				pr_err("%s: %pe, failed to create L2 cache node\n", __func__, pdev);
+			/* the error is not fatal */
+		}
+
+		of_node_put(cache);
+	}
+
 	ret = platform_driver_register(&qcom_cpufreq_driver);
 	if (unlikely(ret < 0))
 		return ret;