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soc: ti: omap-prm: Add pm_clk for genpd 

In order to probe l3 and l4 interconnects with simple-pm-bus, we want
genpd to manage the clocks for the interconnects. For interconnect target
modules, we already have ti-sysc manage the clocks so let's skipe managing
clocks for ti-sysc modules.

Cc: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2020-11-16 12:57:13 +02:00
parent 9fac08999c
commit 176958dd8e
1 changed files with 44 additions and 0 deletions
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44
drivers/soc/ti/omap_prm.c
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@ -7,6 +7,7 @@
*/
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/iopoll.h>
@ -14,6 +15,7 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_clock.h>
#include <linux/pm_domain.h>
#include <linux/reset-controller.h>
#include <linux/delay.h>
@ -41,6 +43,7 @@ struct omap_prm_domain {
u16 pwrstst;
const struct omap_prm_domain_map *cap;
u32 pwrstctrl_saved;
unsigned int uses_pm_clk:1;
};
struct omap_rst_map {
@ -325,6 +328,38 @@ static int omap_prm_domain_power_off(struct generic_pm_domain *domain)
return 0;
}
/*
* Note that ti-sysc already manages the module clocks separately so
* no need to manage those. Interconnect instances need clocks managed
* for simple-pm-bus.
*/
static int omap_prm_domain_attach_clock(struct device *dev,
struct omap_prm_domain *prmd)
{
struct device_node *np = dev->of_node;
int error;
if (!of_device_is_compatible(np, "simple-pm-bus"))
return 0;
if (!of_property_read_bool(np, "clocks"))
return 0;
error = pm_clk_create(dev);
if (error)
return error;
error = of_pm_clk_add_clks(dev);
if (error < 0) {
pm_clk_destroy(dev);
return error;
}
prmd->uses_pm_clk = 1;
return 0;
}
static int omap_prm_domain_attach_dev(struct generic_pm_domain *domain,
struct device *dev)
{
@ -349,6 +384,10 @@ static int omap_prm_domain_attach_dev(struct generic_pm_domain *domain,
genpd_data = dev_gpd_data(dev);
genpd_data->data = NULL;
ret = omap_prm_domain_attach_clock(dev, prmd);
if (ret)
return ret;
return 0;
}
@ -356,7 +395,11 @@ static void omap_prm_domain_detach_dev(struct generic_pm_domain *domain,
struct device *dev)
{
struct generic_pm_domain_data *genpd_data;
struct omap_prm_domain *prmd;
prmd = genpd_to_prm_domain(domain);
if (prmd->uses_pm_clk)
pm_clk_destroy(dev);
genpd_data = dev_gpd_data(dev);
genpd_data->data = NULL;
}
@ -393,6 +436,7 @@ static int omap_prm_domain_init(struct device *dev, struct omap_prm *prm)
prmd->pd.power_off = omap_prm_domain_power_off;
prmd->pd.attach_dev = omap_prm_domain_attach_dev;
prmd->pd.detach_dev = omap_prm_domain_detach_dev;
prmd->pd.flags = GENPD_FLAG_PM_CLK;
pm_genpd_init(&prmd->pd, NULL, true);
error = of_genpd_add_provider_simple(np, &prmd->pd);