Thara Gopinath <thara@xxxxxx> writes:
> This patch adds an API in the opp layer that
> can be used by the voltage layer to get a list of all the
> scalable devices belonging to a particular voltage domain.
> This API is to be typically called only once by the voltage
> layer per voltage domain instance and the device list should
> be stored. This approach makes it easy during dvfs to scale
> all the devices associated with a voltage domain and then
> scale the voltage domain.
>
> Signed-off-by: Thara Gopinath <thara@xxxxxx>
I don't think the OPP layer is the right place for this after all.
How about something like this in the voltage layer:
omap_voltage_add_device(struct voltagedomain *voltdm, struct device *dev)
During omap_device_build(), if the hwmod has a voltage domain, it
calls this function to register it with the voltage layer.
This function then creates a list (internal to voltage layer) of all the
devices in a voltage domain rather than having to query the OPP layer
for it.
Kevin
> ---
> arch/arm/plat-omap/include/plat/opp.h | 9 +++++++++
> arch/arm/plat-omap/opp.c | 28 ++++++++++++++++++++++++++++
> 2 files changed, 37 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/plat-omap/include/plat/opp.h b/arch/arm/plat-omap/include/plat/opp.h
> index 0e580ed..a4c1669 100644
> --- a/arch/arm/plat-omap/include/plat/opp.h
> +++ b/arch/arm/plat-omap/include/plat/opp.h
> @@ -18,6 +18,7 @@
> #include <linux/cpufreq.h>
>
> #include <plat/common.h>
> +#include <plat/voltage.h>
>
> /**
> * struct omap_opp_def - OMAP OPP Definition
> @@ -86,6 +87,9 @@ int opp_disable(struct omap_opp *opp);
>
> void opp_init_cpufreq_table(struct device *dev,
> struct cpufreq_frequency_table **table);
> +
> +struct device **opp_init_voltage_params(struct voltagedomain *voltdm,
> + int *dev_count);
> #else
> static inline unsigned long opp_get_voltage(const struct omap_opp *opp)
> {
> @@ -149,5 +153,10 @@ void opp_init_cpufreq_table(struct omap_opp *opps,
> {
> }
>
> +static inline struct device **opp_init_voltage_params(
> + struct voltagedomain *voltdm, int *dev_count)
> +{
> +}
> +
> #endif /* CONFIG_PM */
> #endif /* __ASM_ARM_OMAP_OPP_H */
> diff --git a/arch/arm/plat-omap/opp.c b/arch/arm/plat-omap/opp.c
> index a3dea82..72dd62a 100644
> --- a/arch/arm/plat-omap/opp.c
> +++ b/arch/arm/plat-omap/opp.c
> @@ -502,3 +502,31 @@ void opp_init_cpufreq_table(struct device *dev,
>
> *table = &freq_table[0];
> }
> +
> +struct device **opp_init_voltage_params(struct voltagedomain *voltdm,
> + int *dev_count)
> +{
> + struct device_opp *dev_opp;
> + struct device **dev_list;
> + int count = 0, i = 0;
> +
> + list_for_each_entry(dev_opp, &dev_opp_list, node) {
> + if (!dev_opp->oh->vdd_name)
> + continue;
> +
> + if (!strcmp(dev_opp->oh->vdd_name, voltdm->name)) {
> + dev_opp->oh->voltdm = voltdm;
> + count++;
> + }
> + }
> +
> + dev_list = kzalloc(sizeof(struct device *) * count, GFP_KERNEL);
> +
> + list_for_each_entry(dev_opp, &dev_opp_list, node) {
> + if (dev_opp->oh->voltdm == voltdm)
> + dev_list[i++] = dev_opp->dev;
> + }
> +
> + *dev_count = count;
> + return dev_list;
> +}
--
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