The mlxreg a multifunction device driver handling LEDs, events, exposing
through sysfs reset signal, and reset causes info. These components share
a common register space.
Signed-off-by: Vadim Pasternak <vadimp@xxxxxxxxxxxx>
---
v4->v5:
Comments pointed out by Rob:
- Avoid duplications in reg;
- Remove unnecessary details in description;
- Do not use names like phandels;
Changes added by Vadim:
- Combine hotplug nodes interrupt aggregation, register offset and mask
properties into hotplug-spec properties;
- Combine reset, cause, etc subnodes register offset, mask and effective
bit properties into attr-spec properties;
v3->v4:
Comments pointed out by Rob:
- Make a separate patch /devicetree/bindings/vendor-prefixes.txt;
- Add .txt to Documentation/devicetree/bindings/mfd/mellanox,mlxreg-core
and send it within this series;
- Modify "compatible" property;
- Modify explanation for "deferred" property;
- Describe each subnode by its own section;
- Don't use underscore in attribute names;
---
.../bindings/mfd/mellanox,mlxreg-core.txt | 165 +++++++++++++++++++++
1 file changed, 165 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mfd/mellanox,mlxreg-core.txt
diff --git a/Documentation/devicetree/bindings/mfd/mellanox,mlxreg-core.txt b/Documentation/devicetree/bindings/mfd/mellanox,mlxreg-core.txt
new file mode 100644
index 0000000..1e3cce5
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/mellanox,mlxreg-core.txt
@@ -0,0 +1,165 @@
+Mellanox programmable device control.
+-------------------------------------
+This binding defines the device control interface over for Mellanox BMC based
+switches.
+
+Required properties:
+- compatible = "mellanox,mlxreg-i2c" or
+ "mellanox,mlxreg-i2c-16"
+
+- #address-cells : must be 1;
+- #size-cells : must be 0;
+- reg : I2C address;
+
+Optional properties:
+- interrupt-parent : phandle of parent interrupt controller;
+- interrupts : interrupt line;
+- deferred : I2C deferred bus phandle;
+ I2C bus activation order enforce for the cases when hot-plug
+ devices are attached to I2C bus, which is initialized after the
+ I2C bus, where programmable device is attached;
+- hotplug-spec <aggr mask>:
+ - aggr : interrupt top aggregation register offset;
+ - mask : interrupt top aggregation register mask;
+
+Optional nodes and their properties:
+ - psu : power supply unit nodes:
+ Required properties:
+ - hotplug-spec <aggr reg mask>:
+ - aggr : effective bit in aggregation interrupt mask;
+ - reg : interrupt status register offset for all group members;
+ - mask : interrupt register mask;
+ - hotplugs - list of relevant dynamic device nodes;
+ - fan : fan unit nodes:
+ Required properties:
+ - hotplug-spec <aggr reg mask>:
+ - aggr : effective bit in aggregation interrupt mask;
+ - reg : interrupt status register offset for all group members;
+ - mask : interrupt register mask;
+ - hotplugs - list of relevant dynamic device nodes;
+ - pwr : power cable nodes:
+ Required properties:
+ - hotplug-spec <aggr reg mask>:
+ - aggr : effective bit in aggregation interrupt mask;
+ - reg : interrupt status register offset for all group members;
+ - mask : interrupt register mask;
+ - hotplugs : list of relevant dynamic device nodes;
+ - host : host side nodes (CPU host side for BMC):
+ Required properties:
+ - hotplug-spec <aggr reg mask>:
+ - aggr : effective bit in aggregation interrupt mask;
+ - reg : interrupt status register offset for all group members;
+ - mask : interrupt register mask;
+ - hotplugs : list of relevant dynamic device nodes;
+ - asic : asic nodes:
+ Required properties:
+ - hotplug-spec <aggr reg mask>:
+ - aggr : effective bit in aggregation interrupt mask;
+ - reg : interrupt status register offsets array per group member;
+ - mask : interrupt register mask;
+ - hotplugs : list of relevant device nodes;
+ - reset : reset nodes for system reset operations:
+ Required properties:
+ - reset control subnodes:
+ Required properties:
+ - attr-spec <reg mask>:
+ - reg : register offset;
+ - mask : attribute mask;
+ - cause - reset cause nodes for reading system reset cause:
+ Required properties:
+ - cause info subnodes:
+ Required properties:
+ - attr-spec <reg mask>:
+ - reg : register offset;
+ - mask : attribute mask;
+ - mux - mux nodes:
+ Required properties:
+ - mux control subnodes for hardware select operations:
+ Required properties:
+ - attr-spec <reg mask bit>:
+ - reg : register offset;
+ - mask : attribute mask;
+ - bit : effective bit;
+ Optional property:
+ - hotplugs : dynamic device node selected by mux;
+ - gprw - general purpose read-write register nodes:
+ Required properties:
+ - general purpose read-write register subnodes:
+ Required properties:
+ - attr-spec <reg mask>:
+ - reg : register offset;
+ - mask : attribute mask;
+ - gpro - general purpose read only register nodes:
+ Required properties:
+ - general purpose read only register subnodes:
+ Required properties:
+ - attr-spec <reg mask>:
+ - reg : register offset.
+ - mask : attribute mask.
+ - led - led nodes for led operations control:
+ Required properties:
+ - led control nodes:
+ Required properties:
+ - attr-spec <reg mask>:
+ - reg : register offset;
+ - mask : attribute mask;
+
+Example:
+ mlxcpld-mng-ctrl@71 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ interrupt-parent = <&gpio>;
+ interrupts = <ASPEED_GPIO(S, 1) 2>;
+ compatible = "mellanox,mlxcpld-ctrl-i2c";
+ reg = <0x71>;
+ deferred = <&i2c6>;
+ hotplug-spec = <0x3a 0x4c>;
+
+ pwr: {
+ hotplug-spec = <0x08 0x64 0x03>;
+ hotplugs = <&psu1_ctrl &psu2_ctrl>;
+ };
+
+ mux {
+ spi_burn_bios_ci {
+ attr-spec = <0x32 0xfe 0x00>;
+ hotplugs = <&spi2>;
+ };
+ };
+
+ led {
+ status-green {
+ attr-spec = <0x20 0xf0>;
+ };
+ status-red {
+ attr-spec = <0x20 0xf0>;
+ };
+ };
+
+ reset {
+ sys_power_cycle {
+ attr-spec = <0x30 0xfb>;
+ };
+ };
+
+ cause {
+ ac_power_cycle {
+ attr-spec = <0x1d 0xfe>;
+ };
+ sys_pwr_cycle: {
+ attr-spec = <0x1e 0xfb>;
+ };
+ };
+
+ gpro {
+ cpld_mng_version {
+ attr-spec <0x00 0xff 0xff>;
+ };
+ };
+
+ gprw {
+ sw_reset_cause {
+ attr-spec = <0x37 0x0f 0x0f>;
+ };
+ };
+ };
--
2.1.4
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