From: khilman@baylibre•com (Kevin Hilman)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v2 2/4] dt-bindings: Add TI SCI PM Domains
Date: Fri, 21 Oct 2016 11:48:52 -0700 [thread overview]
Message-ID: <7heg39pmgb.fsf@baylibre.com> (raw)
In-Reply-To: <20161019203347.17893-3-d-gerlach@ti.com> (Dave Gerlach's message of "Wed, 19 Oct 2016 15:33:45 -0500")
Dave Gerlach <d-gerlach@ti•com> writes:
> 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@ti•com>
> Signed-off-by: Dave Gerlach <d-gerlach@ti•com>
> ---
> .../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 {
should use generic name like "power-contoller", e.g. k2g_pds: power-controller
> + compatible = "ti,sci-pm-domain";
> + #power-domain-cells = <0>;
> + ti,sci = <&pmmc>;
> +};
> +
> +PM Domain Consumers
> +===================
> +Hardware blocks that require SCI control over their state must provide
> +a reference to the sci-pm-domain they are part of and a unique device
> +specific ID that identifies the device.
> +
> +Required Properties:
> +--------------------
> +- power-domains: phandle pointing to the corresponding PM domain node.
> +- ti,sci-id: index representing the device id to be passed oevr SCI to
> + be used for device control.
This ID doesn't look right.
Why not use #power-domain-cells = <1> and pass the index in the DT? ...
> +See dt-bindings/genpd/k2g.h for the list of valid identifiers for k2g.
> +
> +Example:
> +--------------------
> +uart0: serial at 02530c00 {
> + compatible = "ns16550a";
> + ...
> + power-domains = <&k2g_pds>;
> + ti,sci-id = <K2G_DEV_UART0>;
... like this:
power-domains = <&k2g_pds K2G_DEV_UART0>;
Kevin
next prev parent reply other threads:[~2016-10-21 18:48 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-19 20:33 [PATCH v2 0/4] ARM: K2G: Add support for TI-SCI Generic PM Domains Dave Gerlach
2016-10-19 20:33 ` [PATCH v2 1/4] PM / Domains: Add generic data pointer to genpd data struct Dave Gerlach
2016-10-25 9:48 ` Ulf Hansson
2016-10-19 20:33 ` [PATCH v2 2/4] dt-bindings: Add TI SCI PM Domains Dave Gerlach
2016-10-21 18:48 ` Kevin Hilman [this message]
2016-10-21 19:49 ` Dave Gerlach
2016-10-24 17:00 ` Kevin Hilman
2016-10-26 21:59 ` Rob Herring
2016-10-27 13:15 ` Dave Gerlach
2016-11-10 19:56 ` Dave Gerlach
2016-11-11 12:34 ` Ulf Hansson
2016-11-14 19:20 ` Dave Gerlach
2016-10-26 22:04 ` Rob Herring
2016-10-27 9:02 ` Tero Kristo
2016-10-27 14:07 ` Dave Gerlach
2016-10-19 20:33 ` [PATCH v2 3/4] soc: ti: Add ti_sci_pm_domains driver Dave Gerlach
2016-10-21 19:00 ` Kevin Hilman
2016-10-21 19:02 ` Santosh Shilimkar
2016-10-21 19:15 ` Dave Gerlach
2016-10-25 9:48 ` Ulf Hansson
2016-10-19 20:33 ` [PATCH v2 4/4] ARM: keystone: Drop PM domain support for k2g Dave Gerlach
2016-10-21 13:28 ` [PATCH v2 0/4] ARM: K2G: Add support for TI-SCI Generic PM Domains Rafael J. Wysocki
2016-10-25 17:02 ` Kevin Hilman
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