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Date: Thu, 18 Feb 2016 11:07:15 +0800 From: Elaine Zhang <zhangqing@...k-chips.com> To: heiko@...ech.de, wxt@...k-chips.com Cc: linux-arm-kernel@...ts.infradead.org, huangtao@...k-chips.com, zyw@...k-chips.com, xxx@...k-chips.com, jay.xu@...k-chips.com, linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, Elaine Zhang <zhangqing@...k-chips.com> Subject: [PATCH v2 3/6] rockchip: power-domain: add support for sub-power domains 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@...k-chips.com> --- drivers/soc/rockchip/pm_domains.c | 54 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/drivers/soc/rockchip/pm_domains.c b/drivers/soc/rockchip/pm_domains.c index 350527b..8cdf1b2 100644 --- a/drivers/soc/rockchip/pm_domains.c +++ b/drivers/soc/rockchip/pm_domains.c @@ -372,6 +372,54 @@ 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); + of_node_put(parent); + 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); + of_node_put(np); + return -ENODEV; + } + + if (of_property_read_u32(np, "reg", &idx)) { + dev_err(pmu->dev, + "%s: failed to retrieve domain id (reg)\n", + np->name); + of_node_put(np); + 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 +485,12 @@ 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
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