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linux
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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Documentation/devicetree/bindings/reset/st,sti-softreset.txt
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Documentation/devicetree/bindings/reset/st,sti-softreset.txt
···
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STMicroelectronics STi family Sysconfig Peripheral SoftReset Controller
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=============================================================================
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This binding describes a reset controller device that is used to enable and
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disable on-chip peripheral controllers such as USB and SATA, using
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"softreset" control bits found in the STi family SoC system configuration
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registers.
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The actual action taken when softreset is asserted is hardware dependent.
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However, when asserted it may not be possible to access the hardware's
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registers and after an assert/deassert sequence the hardware's previous state
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may no longer be valid.
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Please refer to reset.txt in this directory for common reset
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controller binding usage.
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Required properties:
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- compatible: Should be "st,<chip>-softreset" example:
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"st,stih415-softreset" or "st,stih416-softreset";
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- #reset-cells: 1, see below
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example:
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softreset: softreset-controller {
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#reset-cells = <1>;
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compatible = "st,stih415-softreset";
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};
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Specifying softreset control of devices
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=======================================
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Device nodes should specify the reset channel required in their "resets"
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property, containing a phandle to the softreset device node and an
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index specifying which channel to use, as described in reset.txt
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example:
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ethernet0{
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resets = <&softreset STIH415_ETH0_SOFTRESET>;
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};
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Macro definitions for the supported reset channels can be found in:
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include/dt-bindings/reset-controller/stih415-resets.h
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include/dt-bindings/reset-controller/stih416-resets.h
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arch/arm/boot/dts/stih415.dtsi
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arch/arm/boot/dts/stih415.dtsi
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compatible = "st,stih415-powerdown";
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};
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softreset: softreset-controller {
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#reset-cells = <1>;
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compatible = "st,stih415-softreset";
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};
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syscfg_sbc: sbc-syscfg@fe600000{
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compatible = "st,stih415-sbc-syscfg", "syscon";
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reg = <0xfe600000 0xb4>;
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include/dt-bindings/reset-controller/stih415-resets.h
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include/dt-bindings/reset-controller/stih415-resets.h
···
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#define STIH415_SATA1_POWERDOWN 7
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#define STIH415_PCIE_POWERDOWN 8
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#define STIH415_ETH0_SOFTRESET 0
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#define STIH415_ETH1_SOFTRESET 1
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#define STIH415_IRB_SOFTRESET 2
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#define STIH415_USB0_SOFTRESET 3
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#define STIH415_USB1_SOFTRESET 4
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#define STIH415_USB2_SOFTRESET 5
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#endif /* _DT_BINDINGS_RESET_CONTROLLER_STIH415 */