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authorSrinivas Kandagatla <srinivas.kandagatla@st.com>2014-03-11 10:32:49 +0100
committerSrinivas Kandagatla <srinivas.kandagatla@st.com>2014-03-11 11:03:10 +0100
commitfc58fcf6da7377eeac217b3b187bb004c9564467 (patch)
treedb3924e30f3b1e38c29b76c557f9e892a379d5c0 /Documentation/devicetree/bindings/reset/st,sti-softreset.txt
parentARM: STi: STiH415: Add reset controller support. (diff)
downloadlinux-fc58fcf6da7377eeac217b3b187bb004c9564467.tar.xz
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ARM: STi: STiH415: Add soft reset controller support.
This patch adds soft reset controller support for STiH415 and adds new softreset lines required for other device tree nodes in the header file. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
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+STMicroelectronics STi family Sysconfig Peripheral SoftReset Controller
+=============================================================================
+
+This binding describes a reset controller device that is used to enable and
+disable on-chip peripheral controllers such as USB and SATA, using
+"softreset" control bits found in the STi family SoC system configuration
+registers.
+
+The actual action taken when softreset is asserted is hardware dependent.
+However, when asserted it may not be possible to access the hardware's
+registers and after an assert/deassert sequence the hardware's previous state
+may no longer be valid.
+
+Please refer to reset.txt in this directory for common reset
+controller binding usage.
+
+Required properties:
+- compatible: Should be "st,<chip>-softreset" example:
+ "st,stih415-softreset" or "st,stih416-softreset";
+- #reset-cells: 1, see below
+
+example:
+
+ softreset: softreset-controller {
+ #reset-cells = <1>;
+ compatible = "st,stih415-softreset";
+ };
+
+
+Specifying softreset control of devices
+=======================================
+
+Device nodes should specify the reset channel required in their "resets"
+property, containing a phandle to the softreset device node and an
+index specifying which channel to use, as described in reset.txt
+
+example:
+
+ ethernet0{
+ resets = <&softreset STIH415_ETH0_SOFTRESET>;
+ };
+
+Macro definitions for the supported reset channels can be found in:
+
+include/dt-bindings/reset-controller/stih415-resets.h
+include/dt-bindings/reset-controller/stih416-resets.h