[PATCH v6 1/5] qcom: spm: Add Subsystem Power Manager driver

[Lina Iyer]

On Fri, Sep 26 2014 at 13:04 -0600, Kevin Hilman wrote:
>Lina Iyer <lina.iyer at linaro.org> writes:
>
>> On Wed, Sep 24 2014 at 12:07 -0600, Kumar Gala wrote:
>>>
>>>On Sep 23, 2014, at 6:51 PM, Lina Iyer <lina.iyer at linaro.org> wrote:
>>>
>>>> Based on work by many authors, available at codeaurora.org
>>>>
>>>> SPM is a hardware block that controls the peripheral logic surrounding
>>>> the application cores (cpu/l$). When the core executes WFI instruction,
>>>> the SPM takes over the putting the core in low power state as
>>>> configured. The wake up for the SPM is an interrupt at the GIC, which
>>>> then completes the rest of low power mode sequence and brings the core
>>>> out of low power mode.
>>>>
>>>> The SPM has a set of control registers that configure the SPMs
>>>> individually based on the type of the core and the runtime conditions.
>>>> SPM is a finite state machine block to which a sequence is provided and
>>>> it interprets the bytes  and executes them in sequence. Each low power
>>>> mode that the core can enter into is provided to the SPM as a sequence.
>>>>
>>>> Configure the SPM to set the core (cpu or L2) into its low power mode,
>>>> the index of the first command in the sequence is set in the SPM_CTL
>>>> register. When the core executes ARM wfi instruction, it triggers the
>>>> SPM state machine to start executing from that index. The SPM state
>>>> machine waits until the interrupt occurs and starts executing the rest
>>>> of the sequence until it hits the end of the sequence. The end of the
>>>> sequence jumps the core out of its low power mode.
>>>>
>>>> Signed-off-by: Lina Iyer <lina.iyer at linaro.org>
>>>> [lina: simplify the driver for initial submission, clean up and update
>>>> commit text]
>>>> ---
>>>> Documentation/devicetree/bindings/arm/msm/spm.txt |  43 +++
>>>> drivers/soc/qcom/Kconfig                          |   8 +
>>>> drivers/soc/qcom/Makefile                         |   1 +
>>>> drivers/soc/qcom/spm.c                            | 388 ++++++++++++++++++++++
>>>> include/soc/qcom/spm.h                            |  38 +++
>>>> 5 files changed, 478 insertions(+)
>>>> create mode 100644 Documentation/devicetree/bindings/arm/msm/spm.txt
>>>> create mode 100644 drivers/soc/qcom/spm.c
>>>> create mode 100644 include/soc/qcom/spm.h
>>>
>>>General comment, lets use qcom instead of msm for various things.
>>>
>>>[snip]
>>>
>> OK, Done. I renamed all msm_ functions to qcom_ functions as well.
>>
>
>Does that apply to the other parts of this series too?  like the msm-pm
>and cpuidle layers?
>
Yes, there are no more msm's anymore :)

>Kevin
>
>