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    Subject[PATCH v6 3/6] rockchip: power-domain: add support for sub-power domains
    Date
    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 | 64 +++++++++++++++++++++++++++++++++++++++
    1 file changed, 64 insertions(+)

    diff --git a/drivers/soc/rockchip/pm_domains.c b/drivers/soc/rockchip/pm_domains.c
    index 0465a06..e4ae94f 100644
    --- a/drivers/soc/rockchip/pm_domains.c
    +++ b/drivers/soc/rockchip/pm_domains.c
    @@ -370,6 +370,63 @@ 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;
    + struct generic_pm_domain *child_domain, *parent_domain;
    + int error;
    +
    + for_each_child_of_node(parent, np) {
    + 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);
    + goto err_out;
    + }
    + 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);
    + goto err_out;
    + }
    +
    + if (of_property_read_u32(np, "reg", &idx)) {
    + dev_err(pmu->dev,
    + "%s: failed to retrieve domain id (reg)\n",
    + np->name);
    + goto err_out;
    + }
    + child_domain = pmu->genpd_data.domains[idx];
    +
    + if (pm_genpd_add_subdomain(parent_domain, child_domain)) {
    + dev_err(pmu->dev, "%s failed to add subdomain: %s\n",
    + parent_domain->name, child_domain->name);
    + goto err_out;
    + } else {
    + dev_dbg(pmu->dev, "%s add subdomain: %s\n",
    + parent_domain->name, child_domain->name);
    + }
    +
    + error = rockchip_pm_add_subdomain(pmu, np);
    + if (error < 0)
    + goto rm_sub_domain;
    + }
    + return 0;
    +
    +err_out:
    + of_node_put(parent);
    + of_node_put(np);
    + return -EINVAL;
    +rm_sub_domain:
    + pm_genpd_remove_subdomain(parent_domain, child_domain);
    + return error;
    +}
    +
    static int rockchip_pm_domain_probe(struct platform_device *pdev)
    {
    struct device *dev = &pdev->dev;
    @@ -440,6 +497,13 @@ static int rockchip_pm_domain_probe(struct platform_device *pdev)
    of_node_put(node);
    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

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