From: Nuno Sá <nuno.sa@xxxxxxxxxx> The LTC4283 is a negative voltage hot swap controller that drives an external N-channel MOSFET to allow a board to be safely inserted and removed from a live backplane. Main usage is as an Hardware Monitoring device. However, it has up to 8 pins that can be configured and used as GPIOs and hence, the device can also be a GPIO controller. Signed-off-by: Nuno Sá <nuno.sa@xxxxxxxxxx> --- .../devicetree/bindings/mfd/adi,ltc4283.yaml | 85 ++++++++++++++++++++++ MAINTAINERS | 7 ++ 2 files changed, 92 insertions(+) diff --git a/Documentation/devicetree/bindings/mfd/adi,ltc4283.yaml b/Documentation/devicetree/bindings/mfd/adi,ltc4283.yaml new file mode 100644 index 0000000000000000000000000000000000000000..c5e8aec887d9cfad9052a7c28783396efd6804a9 --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/adi,ltc4283.yaml @@ -0,0 +1,85 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mfd/adi,ltc4283.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: LTC4283 I2C Negative Voltage Hot Swap Controller + +maintainers: + - Nuno Sá <nuno.sa@xxxxxxxxxx> + +description: | + The LTC4283 negative voltage hot swap controller drives an external N-channel + MOSFET to allow a board to be safely inserted and removed from a live + backplane. + + https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4283.pdf + +properties: + compatible: + enum: + - adi,ltc4283 + + reg: + maxItems: 1 + + gpio: + $ref: /schemas/gpio/adi,ltc4283.yaml + hwmon: + $ref: /schemas/hwmon/adi,ltc4283.yaml + + adi,gpio-pins: + description: + The pins to use as GPIOs. The device has 4 ADIO and 4 PGIO + pins than can be used as GPIOs. The ADIO pins are numbered from 0 to 3 + and the PGIO pins are numbered from 4 to 7. + $ref: /schemas/types.yaml#/definitions/uint32-array + minItems: 1 + maxItems: 8 + items: + minimum: 0 + maximum: 7 + +dependencies: + gpio: + - adi,gpio-pins + +required: + - compatible + - reg + - hwmon + +additionalProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + swap-controller@15 { + compatible = "adi,ltc4283"; + reg = <0x15>; + + /* pgio1 to pgio4 as gpios */ + adi,gpio-pins = <0 1 2 3>; + + gpio { + compatible = "adi,ltc4283-gpio"; + gpio-controller; + #gpio-cells = <2>; + }; + + hwmon { + compatible = "adi,ltc4283-hwmon"; + + adi,rsense-nano-ohms = <500>; + adi,current-limit-sense-microvolt = <25000>; + adi,current-limit-foldback-factor = <10>; + adi,cooling-delay-ms = <8190>; + adi,fet-bad-timer-delay-ms = <512>; + }; + }; + }; +... diff --git a/MAINTAINERS b/MAINTAINERS index e90710a9b40d7b32c151472a9ac3b02efd95f346..413bb77d5eebe2b51aa9c3af86e7cfd5ab142044 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14500,6 +14500,13 @@ F: Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml F: Documentation/hwmon/ltc4282.rst F: drivers/hwmon/ltc4282.c +lTC4283 HARDWARE MONITOR AND GPIO DRIVER +M: Nuno Sá <nuno.sa@xxxxxxxxxx> +L: linux-hwmon@xxxxxxxxxxxxxxx +L: linux-gpio@xxxxxxxxxxxxxxx +S: Supported +F: Documentation/devicetree/bindings/mfd/adi,ltc4283.yaml + LTC4286 HARDWARE MONITOR DRIVER M: Delphine CC Chiu <Delphine_CC_Chiu@xxxxxxxxxx> L: linux-hwmon@xxxxxxxxxxxxxxx -- 2.50.1
