On Mar 20, 2015, at 1:21 PM, Lina Iyer <lina.iyer@xxxxxxxxxx> wrote:
>
> Based on work by: Mahesh Sivasubramanian <msivasub@xxxxxxxxxxxxxx>,
> Ai Li <ali@xxxxxxxxxxxxxx>, Praveen Chidambaram <pchidamb@xxxxxxxxxxxxxx>
> Original tree available at -
> git://codeaurora.org/quic/la/kernel/msm-3.10.git
>
> Cc: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
> Cc: Arnd Bergmann <arnd@xxxxxxxx>
> Cc: Kevin Hilman <khilman@xxxxxxxxxx>
> Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
> Signed-off-by: Lina Iyer <lina.iyer@xxxxxxxxxx>
> ---
> .../devicetree/bindings/arm/msm/qcom,saw2.txt | 29 +-
> drivers/soc/qcom/Kconfig | 7 +
> drivers/soc/qcom/Makefile | 1 +
> drivers/soc/qcom/spm.c | 405 +++++++++++++++++++++
> 4 files changed, 436 insertions(+), 6 deletions(-)
> create mode 100644 drivers/soc/qcom/spm.c
>
> diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt b/Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt
> index 1505fb8..664aa91 100644
> --- a/Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt
> +++ b/Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt
> @@ -2,11 +2,20 @@ SPM AVS Wrapper 2 (SAW2)
>
> The SAW2 is a wrapper around the Subsystem Power Manager (SPM) and the
> Adaptive Voltage Scaling (AVS) hardware. The SPM is a programmable
> -micro-controller that transitions a piece of hardware (like a processor or
> +power-controller that transitions a piece of hardware (like a processor or
> subsystem) into and out of low power modes via a direct connection to
> the PMIC. It can also be wired up to interact with other processors in the
> system, notifying them when a low power state is entered or exited.
>
> +Multiple revisions of the SAW hardware are supported using these Device Nodes.
> +SAW2 revisions differ in the register offset and configuration data. Also, the
> +same revision of the SAW in different SoCs may have different configuration
> +data due the the differences in hardware capabilities. Hence the SoC name, the
> +version of the SAW hardware in that SoC and the distinction between cpu (big
> +or Little) or cache, may be needed to uniquely identify the SAW register
> +configuration and initialization data. The compatible string is used to
> +indicate this parameter.
> +
> PROPERTIES
>
> - compatible:
> @@ -14,10 +23,11 @@ PROPERTIES
> Value type: <string>
> Definition: shall contain "qcom,saw2". A more specific value should be
> one of:
Does “qcom,saw2” have any meaning anymore? I see we use it in some places, but not everywhere on the .dts. We also see to have the L2 just be a “qcom,saw2” node, do we expect that to change?
> - "qcom,saw2-v1"
> - "qcom,saw2-v1.1"
> - "qcom,saw2-v2"
> - "qcom,saw2-v2.1"
> + "qcom,saw2-v2"
> + "qcom,saw2-v2.1"
> + "qcom,apq8064-saw2-v1.1-cpu"
> + "qcom,msm8974-saw2-v2.1-cpu"
> + "qcom,apq8084-saw2-v2.1-cpu"
>
> - reg:
> Usage: required
> @@ -26,10 +36,17 @@ PROPERTIES
> the register region. An optional second element specifies
> the base address and size of the alias register region.
>
> +- regulator:
> + Usage: optional
> + Value type: boolean
> + Definition: Indicates that this SPM device acts as a regulator device
> + device for the core (CPU or Cache) the SPM is attached
> + to.
>
> Example:
>
> - regulator@2099000 {
> + power-controller@2099000 {
> compatible = "qcom,saw2";
> reg = <0x02099000 0x1000>, <0x02009000 0x1000>;
> + regulator;
> };
--
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