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Mon, 29 Jan 2024 11:10:25 -0500 Received: from ASHBMBX8.ad.analog.com (10.64.17.5) by ASHBMBX8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.14; Mon, 29 Jan 2024 11:10:24 -0500 Received: from zeus.spd.analog.com (10.66.68.11) by ashbmbx8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server id 15.2.986.14 via Frontend Transport; Mon, 29 Jan 2024 11:10:24 -0500 Received: from [127.0.0.1] ([10.44.3.54]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 40TGA9Cg002356; Mon, 29 Jan 2024 11:10:19 -0500 From: Nuno Sa Date: Mon, 29 Jan 2024 17:13:23 +0100 Subject: [PATCH RESEND v4 1/3] dt-bindings: hwmon: Add LTC4282 bindings Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20240129-b4-ltc4282-support-v4-1-fe75798164cc@analog.com> References: <20240129-b4-ltc4282-support-v4-0-fe75798164cc@analog.com> In-Reply-To: <20240129-b4-ltc4282-support-v4-0-fe75798164cc@analog.com> To: , , CC: Jean Delvare , Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Corbet , Conor Dooley X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; 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Reviewed-by: Conor Dooley Signed-off-by: Nuno Sa --- .../devicetree/bindings/hwmon/adi,ltc4282.yaml | 159 +++++++++++++++++++++ MAINTAINERS | 6 + 2 files changed, 165 insertions(+) diff --git a/Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml b/Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml new file mode 100644 index 000000000000..4854b95a93e3 --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml @@ -0,0 +1,159 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/hwmon/adi,ltc4282.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C + +maintainers: + - Nuno Sa + +description: | + Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C. + + https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4282.pdf + +properties: + compatible: + enum: + - adi,ltc4282 + + reg: + maxItems: 1 + + vdd-supply: true + + clocks: + maxItems: 1 + + '#clock-cells': + const: 0 + + adi,rsense-nano-ohms: + description: Value of the sense resistor. + + adi,vin-mode-microvolt: + description: + Selects operating range for the Undervoltage, Overvoltage and Foldback + pins. Also for the ADC. Should be set to the nominal input voltage. + enum: [3300000, 5000000, 12000000, 24000000] + default: 12000000 + + adi,fet-bad-timeout-ms: + description: + From the moment a FET bad conditions is present, this property selects the + wait time/timeout for a FET-bad fault to be signaled. Setting this to 0, + disables FET bad faults to be reported. + default: 255 + maximum: 255 + + adi,overvoltage-dividers: + description: | + Select which dividers to use for VDD Overvoltage detection. Note that + when the internal dividers are used the threshold is referenced to VDD. + The percentages in the datasheet are misleading since the actual values + to look for are in the "Absolute Maximum Ratings" table in the + "Comparator Inputs" section. In there there's a line for each of the 5%, + 10% and 15% settings with the actual min, typical and max tolerances. + $ref: /schemas/types.yaml#/definitions/string + enum: [external, vdd_5_percent, vdd_10_percent, vdd_15_percent] + default: external + + adi,undervoltage-dividers: + description: | + Select which dividers to use for VDD Overvoltage detection. Note that + when the internal dividers are used the threshold is referenced to VDD. + The percentages in the datasheet are misleading since the actual values + to look for are in the "Absolute Maximum Ratings" table in the + "Comparator Inputs" section. In there there's a line for each of the 5%, + 10% and 15% settings with the actual min, typical and max tolerances. + $ref: /schemas/types.yaml#/definitions/string + enum: [external, vdd_5_percent, vdd_10_percent, vdd_15_percent] + default: external + + adi,current-limit-sense-microvolt: + description: + The current limit sense voltage of the chip is adjustable between + 12.5mV and 34.4mV in 3.1mV steps. This effectively limits the current + on the load. + enum: [12500, 15625, 18750, 21875, 25000, 28125, 31250, 34375] + default: 25000 + + adi,overcurrent-retry: + description: + If set, enables the chip to auto-retry 256 timer cycles after an + Overcurrent fault. + type: boolean + + adi,overvoltage-retry-disable: + description: + If set, disables the chip to auto-retry 50ms after an Overvoltage fault. + It's enabled by default. + type: boolean + + adi,undervoltage-retry-disable: + description: + If set, disables the chip to auto-retry 50ms after an Undervoltage fault. + It's enabled by default. + type: boolean + + adi,fault-log-enable: + description: + If set, enables the FAULT_LOG and ADC_ALERT_LOG registers to be written + to the EEPROM when a fault bit transitions high and hence, will be + available after a power cycle (the chip loads the contents of + the EE_FAULT_LOG register - the one in EEPROM - into FAULT_LOG at boot). + type: boolean + + adi,gpio1-mode: + description: Defines the function of the Pin. It can indicate that power is + good (PULL the pin low when power is not good) or that power is bad (Go + into high-z when power is not good). + $ref: /schemas/types.yaml#/definitions/string + enum: [power_bad, power_good] + default: power_good + + adi,gpio2-mode: + description: Defines the function of the Pin. It can be set as the input for + the ADC or indicating that the MOSFET is in stress (dissipating power). + $ref: /schemas/types.yaml#/definitions/string + enum: [adc_input, stress_fet] + default: adc_input + + adi,gpio3-monitor-enable: + description: If set, gpio3 is set as input for the ADC instead of gpio2. + type: boolean + +allOf: + - if: + required: + - adi,gpio3-monitor-enable + then: + properties: + adi,gpio2-mode: + const: stress_fet + +required: + - compatible + - reg + - adi,rsense-nano-ohms + +additionalProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + hwmon@50 { + compatible = "adi,ltc4282"; + reg = <0x50>; + adi,rsense-nano-ohms = <500>; + + adi,gpio1-mode = "power_good"; + adi,gpio2-mode = "adc_input"; + }; + }; +... diff --git a/MAINTAINERS b/MAINTAINERS index 5e7239cb40ea..3c5f7ae166f0 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12759,6 +12759,12 @@ S: Maintained F: Documentation/hwmon/ltc4261.rst F: drivers/hwmon/ltc4261.c +LTC4282 HARDWARE MONITOR DRIVER +M: Nuno Sa +L: linux-hwmon@vger.kernel.org +S: Supported +F: Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml + LTC4286 HARDWARE MONITOR DRIVER M: Delphine CC Chiu L: linux-i2c@vger.kernel.org From patchwork Mon Jan 29 16:13:24 2024 Content-Type: text/plain; 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Mon, 29 Jan 2024 11:10:23 -0500 Received: from zeus.spd.analog.com (10.66.68.11) by ashbmbx9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server id 15.2.986.14 via Frontend Transport; Mon, 29 Jan 2024 11:10:23 -0500 Received: from [127.0.0.1] ([10.44.3.54]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 40TGA9Ch002356; Mon, 29 Jan 2024 11:10:20 -0500 From: Nuno Sa Date: Mon, 29 Jan 2024 17:13:24 +0100 Subject: [PATCH RESEND v4 2/3] hwmon: add fault attribute for voltage channels Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20240129-b4-ltc4282-support-v4-2-fe75798164cc@analog.com> References: <20240129-b4-ltc4282-support-v4-0-fe75798164cc@analog.com> In-Reply-To: <20240129-b4-ltc4282-support-v4-0-fe75798164cc@analog.com> To: , , CC: Jean Delvare , Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Corbet X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=ed25519-sha256; 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Hence, add a fault attribute to report such failures. Signed-off-by: Nuno Sa --- Documentation/ABI/testing/sysfs-class-hwmon | 9 +++++++++ drivers/hwmon/hwmon.c | 1 + include/linux/hwmon.h | 2 ++ 3 files changed, 12 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-class-hwmon b/Documentation/ABI/testing/sysfs-class-hwmon index 3dac923c9b0e..6c4e68ad4a83 100644 --- a/Documentation/ABI/testing/sysfs-class-hwmon +++ b/Documentation/ABI/testing/sysfs-class-hwmon @@ -149,6 +149,15 @@ Description: RW +What: /sys/class/hwmon/hwmonX/inY_fault +Description: + Reports a voltage hard failure (eg: shorted component) + + - 1: Failed + - 0: Ok + + RO + What: /sys/class/hwmon/hwmonX/cpuY_vid Description: CPU core reference voltage. diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c index c7dd3f5b2bd5..18705049ad61 100644 --- a/drivers/hwmon/hwmon.c +++ b/drivers/hwmon/hwmon.c @@ -510,6 +510,7 @@ static const char * const hwmon_in_attr_templates[] = { [hwmon_in_rated_min] = "in%d_rated_min", [hwmon_in_rated_max] = "in%d_rated_max", [hwmon_in_beep] = "in%d_beep", + [hwmon_in_fault] = "in%d_fault", }; static const char * const hwmon_curr_attr_templates[] = { diff --git a/include/linux/hwmon.h b/include/linux/hwmon.h index c2c0da18dfa3..c7885fdce88f 100644 --- a/include/linux/hwmon.h +++ b/include/linux/hwmon.h @@ -141,6 +141,7 @@ enum hwmon_in_attributes { hwmon_in_rated_min, hwmon_in_rated_max, hwmon_in_beep, + hwmon_in_fault, }; #define HWMON_I_ENABLE BIT(hwmon_in_enable) @@ -162,6 +163,7 @@ enum hwmon_in_attributes { #define HWMON_I_RATED_MIN BIT(hwmon_in_rated_min) #define HWMON_I_RATED_MAX BIT(hwmon_in_rated_max) #define HWMON_I_BEEP BIT(hwmon_in_beep) +#define HWMON_I_FAULT BIT(hwmon_in_fault) enum hwmon_curr_attributes { hwmon_curr_enable,