From: "Andrew F. Davis" <a...@ti.com> Add TI SCI reset controller binding. This describes the DT binding details for a reset controller node providing reset management services to hardware blocks (reset consumers) using the Texas Instrument's System Control Interface (TI SCI) protocol to communicate to a system controller block present on the SoC.
Signed-off-by: Andrew F. Davis <a...@ti.com> [s-a...@ti.com: revise the binding format] Signed-off-by: Suman Anna <s-a...@ti.com> Signed-off-by: Nishanth Menon <n...@ti.com> Acked-by: Santosh Shilimkar <ssant...@kernel.org> Acked-by: Rob Herring <r...@kernel.org> --- Changes in v5: - Dropped the include/dt-bindings/reset/k2g.h file and its references - Updated description for the resets property in the TI-SCI Reset Consumer Nodes section - Updated the example as well to not use the macros from before .../devicetree/bindings/reset/ti,sci-reset.txt | 62 ++++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 63 insertions(+) create mode 100644 Documentation/devicetree/bindings/reset/ti,sci-reset.txt diff --git a/Documentation/devicetree/bindings/reset/ti,sci-reset.txt b/Documentation/devicetree/bindings/reset/ti,sci-reset.txt new file mode 100644 index 000000000000..8b1cf022f18a --- /dev/null +++ b/Documentation/devicetree/bindings/reset/ti,sci-reset.txt @@ -0,0 +1,62 @@ +Texas Instruments System Control Interface (TI-SCI) Reset Controller +===================================================================== + +Some TI SoCs contain a system controller (like the Power Management Micro +Controller (PMMC) on Keystone 66AK2G SoC) that are responsible for controlling +the state of the various hardware modules present on the SoC. Communication +between the host processor running an OS and the system controller happens +through a protocol called TI System Control Interface (TI-SCI protocol). +For TI SCI details, please refer to the document, +Documentation/devicetree/bindings/arm/keystone/ti,sci.txt + +TI-SCI Reset Controller Node +============================ +This reset controller node uses the TI SCI protocol to perform the reset +management of various hardware modules present on the SoC. Must be a child +node of the associated TI-SCI system controller node. + +Required properties: +-------------------- + - compatible : Should be "ti,sci-reset" + - #reset-cells : Should be 2. Please see the reset consumer node below for + usage details. + +TI-SCI Reset Consumer Nodes +=========================== +Each of the reset consumer nodes should have the following properties, +in addition to their own properties. + +Required properties: +-------------------- + - resets : A phandle and reset specifier pair, one pair for each reset + signal that affects the device, or that the device manages. + The phandle should point to the TI-SCI reset controller node, + and the reset specifier should have 2 cell-values. The first + cell should contain the device ID. The second cell should + contain the reset mask value used by system controller. + Please refer to the protocol documentation for these values + to be used for different devices, + http://processors.wiki.ti.com/index.php/TISCI#66AK2G02_Data + +Please also refer to Documentation/devicetree/bindings/reset/reset.txt for +common reset controller usage by consumers. + +Example: +-------- +The following example demonstrates both a TI-SCI reset controller node and a +consumer (a DSP device) on the 66AK2G SoC. + +pmmc: pmmc { + compatible = "ti,k2g-sci"; + + k2g_reset: reset-controller { + compatible = "ti,sci-reset"; + #reset-cells = <2>; + }; +}; + +dsp0: dsp@10800000 { + ... + resets = <&k2g_reset 0x0046 0x1>; + ... +}; diff --git a/MAINTAINERS b/MAINTAINERS index f7d568b8f133..a4c48ec23a11 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12630,6 +12630,7 @@ F: include/linux/soc/ti/ti_sci_protocol.h F: Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt F: include/dt-bindings/genpd/k2g.h F: drivers/soc/ti/ti_sci_pm_domains.c +F: Documentation/devicetree/bindings/reset/ti,sci-reset.txt THANKO'S RAREMONO AM/FM/SW RADIO RECEIVER USB DRIVER M: Hans Verkuil <hverk...@xs4all.nl> -- 2.12.0
