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authorLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2014-02-14 14:28:39 +0000
committerDaniel Lezcano <daniel.lezcano@linaro.org>2014-09-25 10:52:20 +0200
commit9f14da345599c14b329cf5ac9499ad322056dd32 (patch)
treebe20b582f94e247ead39d5b385662d9f78ef3a78 /drivers/cpuidle/Kconfig
parent6baf6ee534c56e754ca854176be0073bc2c9e6a4 (diff)
downloadlinux-9f14da345599c14b329cf5ac9499ad322056dd32.tar.bz2
drivers: cpuidle: implement DT based idle states infrastructure
On most common ARM systems, the low-power states a CPU can be put into are not discoverable in HW and require device tree bindings to describe power down suspend operations and idle states parameters. In order to enable DT based idle states and configure idle drivers, this patch implements the bulk infrastructure required to parse the device tree idle states bindings and initialize the corresponding CPUidle driver states data. The parsing API accepts a start index that defines the first idle state that should be initialized by the parsing code in order to give new and legacy driver flexibility over which states should be parsed using the new DT mechanism. The idle states node(s) is obtained from the phandle list of the first cpu in the driver cpumask; the kernel checks that the idle state node phandle is the same for all CPUs in the driver cpumask before declaring the idle state as valid and start parsing its content. The idle state enter function pointer is initialized through DT match structures passed in by the CPUidle driver, so that ARM legacy code can cope with platform specific idle entry method based on compatible string matching and the code used to initialize the enter function pointer can be moved to the DT generic layer. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/cpuidle/Kconfig')
-rw-r--r--drivers/cpuidle/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig
index 32748c36c477..8deb934c6356 100644
--- a/drivers/cpuidle/Kconfig
+++ b/drivers/cpuidle/Kconfig
@@ -25,6 +25,9 @@ config CPU_IDLE_GOV_MENU
bool "Menu governor (for tickless system)"
default y
+config DT_IDLE_STATES
+ bool
+
menu "ARM CPU Idle Drivers"
depends on ARM
source "drivers/cpuidle/Kconfig.arm"