From: Nuno Sá <nuno.sa@xxxxxxxxxx> Document the bindings for the Hardware monitoring functions of the LTC4283 Hot Swap Controller. Special note for the "adi,vpower-drns-enable" property. It allows to choose between the attenuated MOSFET drain voltage or the attenuated input voltage at the RTNS pin (effectively choosing between input or output power). This is a system level decision not really intended to change at runtime and hence is being added as Firmware property. Signed-off-by: Nuno Sá <nuno.sa@xxxxxxxxxx> --- .../devicetree/bindings/hwmon/adi,ltc4283.yaml | 159 +++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 160 insertions(+) diff --git a/Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml b/Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml new file mode 100644 index 0000000000000000000000000000000000000000..5630623fd3dafa1d86e1877de6cd8844e2826ed2 --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml @@ -0,0 +1,159 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/hwmon/adi,ltc4283.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: HWMON LTC4283 Negative Voltage Hot Swap Controller + +maintainers: + - Nuno Sá <nuno.sa@xxxxxxxxxx> + +description: | + This module is part of the LTC4283 MFD device. + See Documentation/devicetree/bindings/mfd/adi,ltc4283.yaml + This implements the HWMON bindings for the LTC4283 negative voltage hot swap + controller. + +properties: + compatible: + enum: + - adi,ltc4283-hwmon + + adi,rsense-nano-ohms: + description: Value of the sense resistor. + + adi,current-limit-sense-microvolt: + description: + The current limit sense voltage of the chip is adjustable between + 15mV and 30mV in 1mV steps. This effectively limits the current + on the load. + minimum: 15000 + maximum: 30000 + default: 15000 + + adi,current-limit-foldback-factor: + description: + Specifies the foldback factor for the current limit. The current limit + can be reduced (folded back) to one of four preset levels. The value + represents the percentage of the current limit sense voltage to use + during foldback. A value of 100 means no foldback. + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [10, 20, 50, 100] + default: 100 + + adi,cooling-delay-ms: + description: + Cooling time to apply after an overcurrent fault, FET bad or + external fault. + enum: [512, 1002, 2005, 4100, 8190, 16400, 32800, 65600] + default: 512 + + adi,fet-bad-timer-delay-ms: + description: + FET bad timer delay. After a FET bad status condition is detected, + this timer is started. If the condition persists for the + specified time, the FET is turned off and a fault is logged. + enum: [256, 512, 1002, 2005] + default: 256 + + adi,power-good-reset-on-fet: + description: + If set, resets the power good status when the MOSFET is turned off. + Otherwise, it resets when a low output voltage is detected. + type: boolean + + adi,fet-turn-off-disable: + description: + If set, the MOSFET is turned off immediately when a FET fault is detected. + type: boolean + + adi,tmr-pull-down-disable: + description: Disables 2uA pull-down current on the TMR pin. + type: boolean + + adi,dvdt-inrush-control-disable: + description: + Enables dV/dt inrush control during startup. In dV/dt mode, the inrush + current is limited by controlling a constant output voltage ramp rate. + If not set, the inrush control mechanism is active current limiting. + type: boolean + + adi,fault-log-enable: + description: + If set, enables logging fault registers and ADC data into EEPROM upon a + fault. + type: boolean + + adi,vpower-drns-enable: + description: + If set, enables the attenuated MOSFET drain voltage to be monitored. This + effectively means that the MOSFET power is monitored. If not set, the + attenuated input voltage (and hence input power) is monitored. + type: boolean + + adi,external-fault-fet-off-enable: + description: Turns MOSFET off following an external fault. + type: boolean + + adi,undervoltage-retry-disable: + description: Do not retry to turn on the MOSFET after an undervoltage fault. + type: boolean + + adi,overvoltage-retry-disable: + description: Do not retry to turn on the MOSFET after an overvoltage fault. + type: boolean + + adi,external-fault-retry-enable: + description: Retry to turn on the MOSFET retry after an external fault. + type: boolean + + adi,overcurrent-retries: + description: Configures auto-retry following an Overcurrent fault. + $ref: /schemas/types.yaml#/definitions/string + enum: [latch-off, "1", "7", unlimited] + default: latch-off + + adi,fet-bad-retries: + description: + Configures auto-retry following a FET bad fault and a consequent MOSFET + turn off. + $ref: /schemas/types.yaml#/definitions/string + enum: [latch-off, "1", "7", unlimited] + default: latch-off + + adi,pgio1-func: + description: Configures the function of the PGIO1 pin. + $ref: /schemas/types.yaml#/definitions/string + enum: [inverted_power_good, power_good] + default: inverted_power_good + + adi,pgio2-func: + description: Configures the function of the PGIO2 pin. + $ref: /schemas/types.yaml#/definitions/string + enum: [inverted_power_good, power_good, active_current_limiting] + default: inverted_power_good + + adi,pgio3-func: + description: Configures the function of the PGIO3 pin. + $ref: /schemas/types.yaml#/definitions/string + enum: [inverted_power_good_input, power_good_input] + default: inverted_power_good_input + + adi,pgio4-func: + description: Configures the function of the PGIO4 pin. + $ref: /schemas/types.yaml#/definitions/string + enum: [inverted_external_fault, external_fault] + default: inverted_external_fault + +dependencies: + adi,external-fault-retry-enable: + - adi,pgio4-func + adi,external-fault-fet-off-enable: + - adi,pgio4-func + +required: + - compatible + - adi,rsense-nano-ohms + +additionalProperties: false diff --git a/MAINTAINERS b/MAINTAINERS index b5f4f1c41c64b738d57c1fb5552a60b4c6b9985c..5f344ed81c80c9c30d6b2ee81bb00a44874e3b4c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14505,6 +14505,7 @@ M: Nuno Sá <nuno.sa@xxxxxxxxxx> L: linux-hwmon@xxxxxxxxxxxxxxx L: linux-gpio@xxxxxxxxxxxxxxx S: Supported +F: Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml F: Documentation/devicetree/bindings/mfd/adi,ltc4283.yaml F: drivers/mfd/ltc4283.c F: include/linux/mfd/ltc4283.h -- 2.50.1
