[PATCH v1 3/6] rockchip: power-domain: add support for sub-power domains

Elaine Zhang
2016-02-15T08:43:28Z

This patch adds support for making one power domain a sub-domain of
other domain. This is useful for modeling power dependences,
which needs to have more than one power domain enabled to be operational.

Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
---
drivers/soc/rockchip/pm_domains.c | 51 +++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)

diff --git a/drivers/soc/rockchip/pm_domains.c b/drivers/soc/rockchip/pm_domains.c
index 350527b..c4c2aea 100644
--- a/drivers/soc/rockchip/pm_domains.c
+++ b/drivers/soc/rockchip/pm_domains.c
@@ -372,6 +372,51 @@ static void rockchip_configure_pd_cnt(struct rockchip_pmu *pmu,
regmap_write(pmu->regmap, domain_reg_offset + 4, count);
}

+static int rockchip_pm_add_subdomain(struct rockchip_pmu *pmu,
+ struct device_node *parent)
+{
+ struct device_node *np;
+ int error;
+
+ for_each_child_of_node(parent, np) {
+ struct generic_pm_domain *child_domain, *parent_domain;
+ u32 idx = ~0;
+
+ if (of_property_read_u32(parent, "reg", &idx)) {
+ dev_err(pmu->dev,
+ "%s: failed to retrieve domain id (reg)\n",
+ parent->name);
+ return -EINVAL;
+ }
+ parent_domain = pmu->genpd_data.domains[idx];
+
+ error = rockchip_pm_add_one_domain(pmu, np);
+ if (error) {
+ dev_err(pmu->dev, "failed to handle node %s: %d\n",
+ np->name, error);
+ return -ENODEV;
+ }
+
+ if (of_property_read_u32(np, "reg", &idx)) {
+ dev_err(pmu->dev,
+ "%s: failed to retrieve domain id (reg)\n",
+ np->name);
+ return -EINVAL;
+ }
+ child_domain = pmu->genpd_data.domains[idx];
+
+ 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_warn("%s add subdomain: %s\n",
+ parent_domain->name, child_domain->name);
+
+ rockchip_pm_add_subdomain(pmu, np);
+ }
+ return 0;
+}
+
static int rockchip_pm_domain_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -437,6 +482,12 @@ static int rockchip_pm_domain_probe(struct platform_device *pdev)
node->name, error);
goto err_out;
}
+ error = rockchip_pm_add_subdomain(pmu, node);
+ if (error < 0) {
+ dev_err(dev, "failed to handle subdomain node %s: %d\n",
+ node->name, error);
+ goto err_out;
+ }
}

if (error) {
--
1.9.1