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authorDamien Horsley <Damien.Horsley@imgtec.com>2016-01-18 13:12:37 +0000
committerPhilipp Zabel <p.zabel@pengutronix.de>2016-02-05 16:40:43 +0100
commit8859b90162bc4fb0c515f92c28ad126173188156 (patch)
tree6fce3dd1cc00e1e682e2e670018c8fb34d804a1f /Documentation/devicetree/bindings/reset
parentc41ef91f65ea6151969dde699b206794772d407b (diff)
reset: img: Add pistachio reset controller binding document
Add binding document for the Pistachio SoC reset controller Signed-off-by: Damien Horsley <Damien.Horsley@imgtec.com> Signed-off-by: James Hartley <james.hartley@imgtec.com> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
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+Pistachio Reset Controller
+=============================================================================
+
+This binding describes a reset controller device that is used to enable and
+disable individual IP blocks within the Pistachio SoC using "soft reset"
+control bits found in the Pistachio SoC top level registers.
+
+The actual action taken when soft reset is asserted is hardware dependent.
+However, when asserted it may not be possible to access the hardware's
+registers, and following an assert/deassert sequence the hardware's previous
+state may no longer be valid.
+
+Please refer to Documentation/devicetree/bindings/reset/reset.txt
+for common reset controller binding usage.
+
+Required properties:
+
+- compatible: Contains "img,pistachio-reset"
+
+- #reset-cells: Contains 1
+
+Example:
+
+ cr_periph: clk@18148000 {
+ compatible = "img,pistachio-cr-periph", "syscon", "simple-mfd";
+ reg = <0x18148000 0x1000>;
+ clocks = <&clk_periph PERIPH_CLK_SYS>;
+ clock-names = "sys";
+ #clock-cells = <1>;
+
+ pistachio_reset: reset-controller {
+ compatible = "img,pistachio-reset";
+ #reset-cells = <1>;
+ };
+ };
+
+Specifying reset control of devices
+=======================================
+
+Device nodes should specify the reset channel required in their "resets"
+property, containing a phandle to the pistachio reset device node and an
+index specifying which reset to use, as described in
+Documentation/devicetree/bindings/reset/reset.txt.
+
+Example:
+
+ spdif_out: spdif-out@18100d00 {
+ ...
+ resets = <&pistachio_reset PISTACHIO_RESET_SPDIF_OUT>;
+ reset-names = "rst";
+ ...
+ };
+
+Macro definitions for the supported resets can be found in:
+include/dt-bindings/reset/pistachio-resets.h