[PATCH v7 3/8] drivers: cpuidle: implement DT based idle states infrastructure

Catalin Marinas
2014-08-18T14:21:00Z

On Thu, Aug 14, 2014 at 12:29:11PM +0100, Lorenzo Pieralisi wrote:
> Here the refreshed patch is:
>
> -- >8 --
> Subject: [PATCH] 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 list is obtained from the first cpu in the driver
> cpumask, which implicitly means the parsing code expects idle states
> (and related list of phandles) to be the same for all CPUs in the
> CPUidle driver mask. The kernel does not check this assumption, it must
> be enforced by the bootloader to ensure correct system behaviour.
>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> ---
> drivers/cpuidle/Kconfig | 3 +
> drivers/cpuidle/Makefile | 1 +
> drivers/cpuidle/dt_idle_states.c | 175 +++++++++++++++++++++++++++++++++++++++
> drivers/cpuidle/dt_idle_states.h | 5 ++
> 4 files changed, 184 insertions(+)
> create mode 100644 drivers/cpuidle/dt_idle_states.c
> create mode 100644 drivers/cpuidle/dt_idle_states.h

Acked-by: Catalin Marinas <catalin.marinas@arm.com>