On 10/27/2016 04:02 AM, Tero Kristo wrote:
> On 27/10/16 01:04, Rob Herring wrote:
>> On Wed, Oct 19, 2016 at 03:33:45PM -0500, Dave Gerlach wrote:
>>> Add a generic power domain implementation, TI SCI PM Domains, that
>>> will hook into the genpd framework and allow the TI SCI protocol to
>>> control device power states.
>>>
>>> Also, provide macros representing each device index as understood
>>> by TI SCI to be used in the device node power-domain references.
>>> These are identifiers for the K2G devices managed by the PMMC.
>>>
>>> Signed-off-by: Nishanth Menon <nm@xxxxxx>
>>> Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx>
>>> ---
>>> .../devicetree/bindings/soc/ti/sci-pm-domain.txt | 54 +++++++++++++
>>> MAINTAINERS | 2 +
>>> include/dt-bindings/genpd/k2g.h | 90 ++++++++++++++++++++++
>>> 3 files changed, 146 insertions(+)
>>> create mode 100644 Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt
>>> create mode 100644 include/dt-bindings/genpd/k2g.h
>>>
>>> diff --git a/Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt
>>> b/Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt
>>> new file mode 100644
>>> index 000000000000..32f38a349656
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt
>>> @@ -0,0 +1,54 @@
>>> +Texas Instruments TI-SCI Generic Power Domain
>>> +---------------------------------------------
>>> +
>>> +Some TI SoCs contain a system controller (like the PMMC, etc...) that is
>>> +responsible for controlling the state of the IPs that are present.
>>> +Communication between the host processor running an OS and the system
>>> +controller happens through a protocol known as TI-SCI [1]. This pm domain
>>> +implementation plugs into the generic pm domain framework and makes use of
>>> +the TI SCI protocol power on and off each device when needed.
>>> +
>>> +[1] Documentation/devicetree/bindings/arm/keystone/ti,sci.txt
>>> +
>>> +PM Domain Node
>>> +==============
>>> +The PM domain node represents the global PM domain managed by the PMMC,
>>> +which in this case is the single implementation as documented by the generic
>>> +PM domain bindings in Documentation/devicetree/bindings/power/power_domain.txt.
>>> +
>>> +Required Properties:
>>> +--------------------
>>> +- compatible: should be "ti,sci-pm-domain"
>>> +- #power-domain-cells: Must be 0.
>>> +- ti,sci: Phandle to the TI SCI device to use for managing the devices.
>>> +
>>> +Example:
>>> +--------------------
>>> +k2g_pds: k2g_pds {
>>> + compatible = "ti,sci-pm-domain";
>>> + #power-domain-cells = <0>;
>>> + ti,sci = <&pmmc>;
>>> +};
>>
>> Why not just make the PMMC node be the power-domain provider itself? If
>> not that, then make this a child node of it. The same comment applies to
>> all the SCI functions, but I guess I've already acked some of them.
>
> This seems to be a bug in this documentation actually. ti,sci handle is no
> longer supported, and all the sci stuff must be under the parent sci node.
>
>>
>> I really don't like reviewing all these TI SCI bindings one by one. Each
>> one on its own seems fine, but I don't see the full picture.
>
> The full picture is represented under the documentation for the main protocol
> support itself. See this patch:
>
> https://patchwork.kernel.org/patch/9383281/
>
> Copy pasted here as ref:
>
> Example (K2G):
> -------------
> pmmc: pmmc {
> compatible = "ti,k2g-sci";
> ...
>
> my_clk_node: clk_node {
> ...
> ...
> };
>
> my_pd_node: pd_node {
> ...
> ...
> };
> };
>
>
Yes my bad I will fix this in V3 once we straighten out the ID portion of the
binding.
Regards,
Dave
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
