soc: samsung: pm_domains: Read domain name from the new label property

Device tree nodes for each power domain should use generic "power-domain"
name, so using it as a domain name doesn't give much benefits. This patch
adds support for human readable names defined in 'label' property. Such
names are visible to userspace and makes debugging much easier. When no
'label' property is found, driver keeps using the name constructed from
full node name.

Suggested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

diff --git a/Documentation/devicetree/bindings/power/pd-samsung.txt b/Documentation/devicetree/bindings/power/pd-samsung.txt
index 4e94737..c461b10 100644 (file)
--- a/Documentation/devicetree/bindings/power/pd-samsung.txt
+++ b/Documentation/devicetree/bindings/power/pd-samsung.txt
@@ -12,6 +12,8 @@ Required Properties:
     must be 0.
 
 Optional Properties:
+- label: Human readable string with domain name. Will be visible in userspace
+       to let user to distinguish between multiple domains in SoC.
 - clocks: List of clock handles. The parent clocks of the input clocks to the
        devices in this power domain are set to oscclk before power gating
        and restored back after powering on a domain. This is required for
@@ -38,6 +40,7 @@ Example:
                compatible = "samsung,exynos4210-pd";
                reg = <0x10023C00 0x10>;
                #power-domain-cells = <0>;
+               label = "LCD0";
        };
 
        mfc_pd: power-domain@10044060 {
@@ -46,6 +49,7 @@ Example:
                clocks = <&clock CLK_FIN_PLL>, <&clock CLK_MOUT_USER_ACLK333>;
                clock-names = "oscclk", "clk0";
                #power-domain-cells = <0>;
+               label = "MFC";
        };
 
 See Documentation/devicetree/bindings/power/power_domain.txt for description

diff --git a/drivers/soc/samsung/pm_domains.c b/drivers/soc/samsung/pm_domains.c
index 0649024..3127017 100644 (file)
--- a/drivers/soc/samsung/pm_domains.c
+++ b/drivers/soc/samsung/pm_domains.c
@@ -135,6 +135,15 @@ static const struct of_device_id exynos_pm_domain_of_match[] __initconst = {
        { },
 };
 
+static __init const char *exynos_get_domain_name(struct device_node *node)
+{
+       const char *name;
+
+       if (of_property_read_string(node, "label", &name) < 0)
+               name = strrchr(node->full_name, '/') + 1;
+       return kstrdup_const(name, GFP_KERNEL);
+}
+
 static __init int exynos4_pm_init_power_domain(void)
 {
        struct device_node *np;
@@ -152,8 +161,7 @@ static __init int exynos4_pm_init_power_domain(void)
                        of_node_put(np);
                        return -ENOMEM;
                }
-               pd->pd.name = kstrdup_const(strrchr(np->full_name, '/') + 1,
-                                           GFP_KERNEL);
+               pd->pd.name = exynos_get_domain_name(np);
                if (!pd->pd.name) {
                        kfree(pd);
                        of_node_put(np);