This patch adds supports for parent power domain. This will ensure
invoking of parent/child power domain on/off in a correct sequence.
In exynos7 SOC's, power domain controllers have parent and child
hierarchy.
Cc: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
Signed-off-by: Amit Daniel Kachhap <amit.daniel@xxxxxxxxxxx>
---
.../bindings/arm/exynos/power_domain.txt | 2 +
drivers/soc/samsung/pm_domains.c | 43 +++++++++++++++++++-
2 files changed, 44 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
index 00ebda1..0160bdc 100644
--- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
+++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
@@ -24,6 +24,7 @@ Optional Properties:
- pclkN, clkN: Pairs of parent of input clock and input clock to the
devices in this power domain. Maximum of 4 pairs (N = 0 to 3)
are supported currently.
+- parents: phandle of parent power domains.
Node of a device using power domains must have a samsung,power-domain property
defined with a phandle to respective power domain.
@@ -48,6 +49,7 @@ Example:
mfc_pd: power-domain@10044060 {
compatible = "samsung,exynos4210-pd", "samsung,exynos7-pd-mfc";
reg = <0x10044060 0x20>;
+ parents = <&pd_top>;
#power-domain-cells = <0>;
};
diff --git a/drivers/soc/samsung/pm_domains.c b/drivers/soc/samsung/pm_domains.c
index f4f2a6c..89e2fd5 100644
--- a/drivers/soc/samsung/pm_domains.c
+++ b/drivers/soc/samsung/pm_domains.c
@@ -25,10 +25,10 @@
#include <linux/soc/samsung/exynos-pmu.h>
#define MAX_CLK_PER_DOMAIN 4
+#define MAX_PARENT_POWER_DOMAIN 10
static struct exynos_pmu_pd_ops *pd_ops;
-
/*
* Exynos specific wrapper around the generic power domain
*/
@@ -169,6 +169,47 @@ no_clk:
of_genpd_add_provider_simple(np, &pd->pd);
}
+ /* Assign the child power domains to their parents */
+ for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
+ struct device_node *parent_np;
+ int i;
+ struct generic_pm_domain *child_domain, *parent_domain;
+ const char *name;
+
+ if (of_property_read_string_index(np, "compatible", 1,
+ &name)) {
+ /* Second entry not found, use the node name*/
+ name = np->name;
+ }
+
+ child_domain = pm_genpd_lookup_name(name);
+ if (!child_domain)
+ continue;
+ /* search parents in device tree */
+ for (i = 0; i < MAX_PARENT_POWER_DOMAIN; i++) {
+ parent_np = of_parse_phandle(np, "parents", i);
+ if (!parent_np)
+ break;
+
+ if (of_property_read_string_index(parent_np,
+ "compatible", 1, &name)) {
+ /* Second entry not found, use the node name*/
+ name = parent_np->name;
+ }
+
+ parent_domain = pm_genpd_lookup_name(name);
+ if (!parent_domain)
+ break;
+ if (pm_genpd_add_subdomain(parent_domain, child_domain))
+ pr_warn("%s failed to add subdomain: %s\n",
+ parent_domain->name,
+ child_domain->name);
+ else
+ pr_info("%s has as child subdomain: %s.\n",
+ parent_domain->name,
+ child_domain->name);
+ }
+ }
return 0;
}
--
1.7.9.5
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