ARM: rockchip: add option to access the pmu via a phandle in smp_operations
From: Heiko Stuebner <heiko@...> Date: Wed, 15 Oct 2014 10:23:01 -0700
Commit-Message
Makes it possible to define a rockchip,pmu phandle in the cpus node directly referencing the pmu syscon instead of searching for specific compatible. The old way of finding the pmu stays of course available. Signed-off-by: Kever Yang <kever.yang@...> Tested-by: Kevin Hilman <khilman@...> Signed-off-by: Heiko Stuebner <heiko@...>
Patch-Comment
Documentation/devicetree/bindings/arm/cpus.txt | 9 +++++++++ arch/arm/mach-rockchip/platsmp.c | 13 +++++++++++++ 2 files changed, 22 insertions(+)
Statistics
- 22 lines added
- 0 lines removed
Changes
---------------- Documentation/devicetree/bindings/arm/cpus.txt ----------------
index fc44634..b2aacbe 100644
@@ -227,6 +227,15 @@ nodes to be present and contain the properties described below.
# List of phandles to idle state nodes supported
by this cpu [3].
+ - rockchip,pmu
+ Usage: optional for systems that have an "enable-method"
+ property value of "rockchip,rk3066-smp"
+ While optional, it is the preferred way to get access to
+ the cpu-core power-domains.
+ Value type: <phandle>
+ Definition: Specifies the syscon node controlling the cpu core
+ power domains.
+
Example 1 (dual-cluster big.LITTLE system 32-bit):
cpus {
----------------------- arch/arm/mach-rockchip/platsmp.c -----------------------
index 4c36fbf..57b53b3 100644
@@ -155,6 +155,19 @@ static int __init rockchip_smp_prepare_pmu(void)
struct device_node *node;
void __iomem *pmu_base;
+ /*
+ * This function is only called via smp_ops->smp_prepare_cpu().
+ * That only happens if a "/cpus" device tree node exists
+ * and has an "enable-method" property that selects the SMP
+ * operations defined herein.
+ */
+ node = of_find_node_by_path("/cpus");
+
+ pmu = syscon_regmap_lookup_by_phandle(node, "rockchip,pmu");
+ of_node_put(node);
+ if (!IS_ERR(pmu))
+ return 0;
+
pmu = syscon_regmap_lookup_by_compatible("rockchip,rk3066-pmu");
if (!IS_ERR(pmu))
return 0;