dt-bindings: reset: Add TI SCI reset binding

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 <afd@ti.com>
[s-anna@ti.com: revise the binding format]
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

diff --git a/Documentation/devicetree/bindings/reset/ti,sci-reset.txt b/Documentation/devicetree/bindings/reset/ti,sci-reset.txt
new file mode 100644 (file)
index 0000000..8b1cf02
--- /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 f7d568b8f133d9919e3823c102d7ac78f89c894a..a4c48ec23a115b12246002d7536b1af7ddc94816 100644 (file)
--- 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
 
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