In addition to clocks and regulators, some devices can scale the bandwidth
of their on-chip interconnect - for example between CPU and DDR memory. Add
support for that, so that platforms which support it can make use of it.
Signed-off-by: Georgi Djakov <[email protected]>
---
v7:
* Drop using dev_pm_opp_set_paths(), as it has been removed.
* Add Kconfig dependency on INTERCONNECT, as it can be module.
v2: https://lore.kernel.org/r/[email protected]
drivers/cpufreq/Kconfig | 1 +
drivers/cpufreq/cpufreq-dt.c | 15 +++++++++++++++
2 files changed, 16 insertions(+)
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index c3e6bd59e920..db2ad54ee67f 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -217,6 +217,7 @@ config CPUFREQ_DT
config CPUFREQ_DT_PLATDEV
bool
+ depends on INTERCONNECT || !INTERCONNECT
help
This adds a generic DT based cpufreq platdev driver for frequency
management. This creates a 'cpufreq-dt' platform device, on the
diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 26fe8dfb9ce6..4ecef3257532 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -13,6 +13,7 @@
#include <linux/cpufreq.h>
#include <linux/cpumask.h>
#include <linux/err.h>
+#include <linux/interconnect.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm_opp.h>
@@ -95,6 +96,7 @@ static int resources_available(void)
struct device *cpu_dev;
struct regulator *cpu_reg;
struct clk *cpu_clk;
+ struct icc_path *cpu_path;
int ret = 0;
const char *name;
@@ -121,6 +123,19 @@ static int resources_available(void)
clk_put(cpu_clk);
+ cpu_path = of_icc_get(cpu_dev, NULL);
+ ret = PTR_ERR_OR_ZERO(cpu_path);
+ if (ret) {
+ if (ret == -EPROBE_DEFER)
+ dev_dbg(cpu_dev, "defer icc path: %d\n", ret);
+ else
+ dev_err(cpu_dev, "failed to get icc path: %d\n", ret);
+
+ return ret;
+ }
+
+ icc_put(cpu_path);
+
name = find_supply_name(cpu_dev);
/* Platform doesn't require regulator */
if (!name)
On Fri, Apr 24, 2020 at 06:54:04PM +0300, Georgi Djakov wrote:
> In addition to clocks and regulators, some devices can scale the bandwidth
> of their on-chip interconnect - for example between CPU and DDR memory. Add
> support for that, so that platforms which support it can make use of it.
>
> Signed-off-by: Georgi Djakov <[email protected]>
> ---
> v7:
> * Drop using dev_pm_opp_set_paths(), as it has been removed.
> * Add Kconfig dependency on INTERCONNECT, as it can be module.
>
>
> v2: https://lore.kernel.org/r/[email protected]
>
> drivers/cpufreq/Kconfig | 1 +
> drivers/cpufreq/cpufreq-dt.c | 15 +++++++++++++++
> 2 files changed, 16 insertions(+)
>
> diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
> index c3e6bd59e920..db2ad54ee67f 100644
> --- a/drivers/cpufreq/Kconfig
> +++ b/drivers/cpufreq/Kconfig
> @@ -217,6 +217,7 @@ config CPUFREQ_DT
>
> config CPUFREQ_DT_PLATDEV
> bool
> + depends on INTERCONNECT || !INTERCONNECT
> help
> This adds a generic DT based cpufreq platdev driver for frequency
> management. This creates a 'cpufreq-dt' platform device, on the
> diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
> index 26fe8dfb9ce6..4ecef3257532 100644
> --- a/drivers/cpufreq/cpufreq-dt.c
> +++ b/drivers/cpufreq/cpufreq-dt.c
> @@ -13,6 +13,7 @@
> #include <linux/cpufreq.h>
> #include <linux/cpumask.h>
> #include <linux/err.h>
> +#include <linux/interconnect.h>
> #include <linux/module.h>
> #include <linux/of.h>
> #include <linux/pm_opp.h>
> @@ -95,6 +96,7 @@ static int resources_available(void)
> struct device *cpu_dev;
> struct regulator *cpu_reg;
> struct clk *cpu_clk;
> + struct icc_path *cpu_path;
> int ret = 0;
> const char *name;
>
> @@ -121,6 +123,19 @@ static int resources_available(void)
>
> clk_put(cpu_clk);
>
> + cpu_path = of_icc_get(cpu_dev, NULL);
> + ret = PTR_ERR_OR_ZERO(cpu_path);
> + if (ret) {
> + if (ret == -EPROBE_DEFER)
> + dev_dbg(cpu_dev, "defer icc path: %d\n", ret);
> + else
> + dev_err(cpu_dev, "failed to get icc path: %d\n", ret);
> +
> + return ret;
> + }
> +
> + icc_put(cpu_path);
> +
> name = find_supply_name(cpu_dev);
> /* Platform doesn't require regulator */
> if (!name)
Reviewed-by: Matthias Kaehlcke <[email protected]>
Hey Georgi,
On 2020-04-24 21:24, Georgi Djakov wrote:
> In addition to clocks and regulators, some devices can scale the
> bandwidth
> of their on-chip interconnect - for example between CPU and DDR memory.
> Add
> support for that, so that platforms which support it can make use of
> it.
>
> Signed-off-by: Georgi Djakov <[email protected]>
> ---
> v7:
> * Drop using dev_pm_opp_set_paths(), as it has been removed.
> * Add Kconfig dependency on INTERCONNECT, as it can be module.
>
>
> v2:
> https://lore.kernel.org/r/[email protected]
>
> drivers/cpufreq/Kconfig | 1 +
> drivers/cpufreq/cpufreq-dt.c | 15 +++++++++++++++
> 2 files changed, 16 insertions(+)
>
> diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
> index c3e6bd59e920..db2ad54ee67f 100644
> --- a/drivers/cpufreq/Kconfig
> +++ b/drivers/cpufreq/Kconfig
> @@ -217,6 +217,7 @@ config CPUFREQ_DT
>
> config CPUFREQ_DT_PLATDEV
> bool
> + depends on INTERCONNECT || !INTERCONNECT
> help
> This adds a generic DT based cpufreq platdev driver for frequency
> management. This creates a 'cpufreq-dt' platform device, on the
> diff --git a/drivers/cpufreq/cpufreq-dt.c
> b/drivers/cpufreq/cpufreq-dt.c
> index 26fe8dfb9ce6..4ecef3257532 100644
> --- a/drivers/cpufreq/cpufreq-dt.c
> +++ b/drivers/cpufreq/cpufreq-dt.c
> @@ -13,6 +13,7 @@
> #include <linux/cpufreq.h>
> #include <linux/cpumask.h>
> #include <linux/err.h>
> +#include <linux/interconnect.h>
> #include <linux/module.h>
> #include <linux/of.h>
> #include <linux/pm_opp.h>
> @@ -95,6 +96,7 @@ static int resources_available(void)
> struct device *cpu_dev;
> struct regulator *cpu_reg;
> struct clk *cpu_clk;
> + struct icc_path *cpu_path;
> int ret = 0;
> const char *name;
>
> @@ -121,6 +123,19 @@ static int resources_available(void)
>
> clk_put(cpu_clk);
>
> + cpu_path = of_icc_get(cpu_dev, NULL);
> + ret = PTR_ERR_OR_ZERO(cpu_path);
Wouldn't we want to verify all
available paths instead of just
the first path?
> + if (ret) {
> + if (ret == -EPROBE_DEFER)
> + dev_dbg(cpu_dev, "defer icc path: %d\n", ret);
> + else
> + dev_err(cpu_dev, "failed to get icc path: %d\n", ret);
> +
> + return ret;
> + }
> +
> + icc_put(cpu_path);
> +
> name = find_supply_name(cpu_dev);
> /* Platform doesn't require regulator */
> if (!name)
--
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