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    Subject[PATCH RFC v2 08/12] soc: samsung: pm_domain: Add support for parent power domain
    Date
    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@samsung.com>
    Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
    ---
    .../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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