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author | Srinivas Kandagatla <srinivas.kandagatla@st.com> | 2014-03-11 09:24:55 +0000 |
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committer | Srinivas Kandagatla <srinivas.kandagatla@st.com> | 2014-03-11 10:02:51 +0000 |
commit | 6b7f06cc805bb4755e69cd916b3f565947e0a77a (patch) | |
tree | 087a444745f1a096da308014bd2afc077a08f471 /Documentation/devicetree | |
parent | 7ec5183a0ab1930b071c3c68a7d3b08e29b8bb78 (diff) | |
download | linux-6b7f06cc805bb4755e69cd916b3f565947e0a77a.tar.bz2 |
ARM: STi: STiH415: Add reset controller support.
This patch adds a reset controller node to the SOC device tree and also
adds new header files with reset lines required for other device tree
nodes.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Diffstat (limited to 'Documentation/devicetree')
-rw-r--r-- | Documentation/devicetree/bindings/reset/st,sti-powerdown.txt | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/reset/st,sti-powerdown.txt b/Documentation/devicetree/bindings/reset/st,sti-powerdown.txt new file mode 100644 index 000000000000..5ab26b7e9d35 --- /dev/null +++ b/Documentation/devicetree/bindings/reset/st,sti-powerdown.txt @@ -0,0 +1,47 @@ +STMicroelectronics STi family Sysconfig Peripheral Powerdown Reset 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 +"powerdown" control bits found in the STi family SoC system configuration +registers. These have been grouped together into a single reset controller +device for convenience. + +The actual action taken when powerdown 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>-powerdown" + ex: "st,stih415-powerdown", "st,stih416-powerdown" +- #reset-cells: 1, see below + +example: + + powerdown: powerdown-controller { + #reset-cells = <1>; + compatible = "st,stih415-powerdown"; + }; + + +Specifying powerdown control of devices +======================================= + +Device nodes should specify the reset channel required in their "resets" +property, containing a phandle to the powerdown device node and an +index specifying which channel to use, as described in reset.txt + +example: + + usb1: usb@fe200000 { + resets = <&powerdown STIH41X_USB1_POWERDOWN>; + }; + +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 |