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charset="utf-8" Content-Transfer-Encoding: 8bit Message-ID: <20261104-staging-ltc4284-v1-1-49fce67ebc48@analog.com> References: <20261104-staging-ltc4284-v1-0-49fce67ebc48@analog.com> In-Reply-To: <20261104-staging-ltc4284-v1-0-49fce67ebc48@analog.com> To: =?utf-8?q?Nuno_S=C3=A1?= , Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Corbet , Shuah Khan , Randy Dunlap , Linus Walleij , Bartosz Golaszewski CC: , , , , , Alexis Czezar Torreno X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1793763007; l=3536; i=alexisczezar.torreno@analog.com; s=20250213; h=from:subject:message-id; bh=ACu8B+VQwMlj+xO1RLKzl0xgoDpW97SlVRbOYHQd84I=; b=w20T5jdj2UqSG/Irhp6w8q5f707t399cv7mbq0iSh49SFSYoOgCctTEjTDqMc/Xvj1wR2f8il NhWgxxHnw1yBYm+W7dWSa6u04Pwf/7Tx+x3VOZ2w/XScm2yrvhJAFq0 X-Developer-Key: i=alexisczezar.torreno@analog.com; a=ed25519; pk=XpXmJnRjnsKdDil6YpOlj9+44S+XYXVFnxvkbmaZ+10= X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-GUID: Sx-IsEG8UAdakJt6DgX7PNASqu7bvnZF X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA0MDAxMyBTYWx0ZWRfX85edNpGHFIyt Z4qFC/5RoeoY1XlQwRpOP1rqo3haKGb/aWy746/XHb0sROLIT8rhMcCbzEuLV+9Bt1jNABxzeKA msu72ocGbGH5AWLxKn1HbTmQ7p9pI4dXlsm1/wicY+2PoD+Zv5X6 X-Authority-Analysis: v=2.4 cv=NPlAaE6g c=1 sm=1 tr=0 ts=6aeaa6d7 cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=0sLvza09kfJOxVLZPwjg:22 a=Z0pTeXoby7EwIRygza74:22 a=gAnH3GRIAAAA:8 a=YjxJmSmyZUQDncK08pIA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: Sx-IsEG8UAdakJt6DgX7PNASqu7bvnZF X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTA0MDAxMyBTYWx0ZWRfX4k7sKCix1qud AIEZ+E2BzGu4/ZK6IXHe4fFKkRsl1aeDLh8cidwFR6enYIYkBJ9f1nQRlA/J5zlkfAHNoYGAA3t IhsDy3eXBrZZjHwnpPPt0Jbroqwb/WXxlAbdT9qgCAR+vTOhAd3P1OI6+CxI7PjflufR0c7Qt0g yDGslHHNZn7SJQtoKG8F814r8iH+50JJspjFZP6WTfbDlV68/EwAZsc8CwTBoeMSTW81IJP/TTX qgaZvP4quDHckrLP3NJ8MJo+npP1bVydw0QhncdjS/10/DQoGOQ2bYClwG2iqlnpm6YRyvQvTKk p/WD6vX91REHFSc0bvOAZ3csZQGqojPHzQwuWc4ka/rgUEy+P1Ydr9aFihLnCMTNSVkqpFm1RTb KBaD+IKSo5aEPa94Is3rRbSGR6ITDE9WT9PCuc0VmP+rNnwmRX0NQ23N4zWSjtNUrAFbNr/bZiq Y4F3VnTJkmK0y1S44YA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-04_01,2026-11-03_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 impostorscore=0 suspectscore=0 bulkscore=0 clxscore=1011 priorityscore=1501 spamscore=0 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2611040013 The LTC4284 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. Note that this device has a MODE pin that is determined by differing voltage levels (VEE, VIN, INTVCC, or left open) and cannot be controlled via software or GPIO. Signed-off-by: Alexis Czezar Torreno --- .../devicetree/bindings/hwmon/adi,ltc4283.yaml | 57 ++++++++++++++++++++-- 1 file changed, 53 insertions(+), 4 deletions(-) diff --git a/Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml b/Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml index 05e2132ad4d8621ab76ee89aa166c131fed08e85..c850390ddc4a33ed3fd877bf4620f7f009366ff5 100644 --- a/Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml +++ b/Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml @@ -10,22 +10,42 @@ maintainers: - Nuno Sá 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. + The LTC4283 and LTC4284 are negative voltage hot swap controllers that drive + external N-channel MOSFETs to allow a board to be safely inserted and removed + from a live backplane. + + The LTC4284 features dual-gate drivers with four operating modes (single + driver, parallel, high stress staged start, and low stress staged start) + configured via the hardware MODE pin. The MODE pin must be connected to the + appropriate voltage level (VEE, VIN, INTVCC, or left open) and cannot be + controlled via software or GPIO. https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4283.pdf + https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4284.pdf properties: compatible: enum: - adi,ltc4283 + - adi,ltc4284 reg: maxItems: 1 adi,rsense-nano-ohms: - description: Value of the sense resistor. + description: + Value of the sense resistor. For LTC4283, this is the resistor connected + between SENSE+/SENSE- pins. For LTC4284, this is the resistor connected + between SENSE1+/SENSE1- pins. + + adi,rsense2-nano-ohms: + description: + Value of the SENSE2 current sense resistor. This resistor is connected + between SENSE2+ and SENSE2- pins. + + adi,radc-nano-ohms: + description: + Value of the effective resistance seen by the ADC+/ADC- pins. adi,current-limit-sense-microvolt: description: @@ -195,6 +215,20 @@ required: - adi,rsense-nano-ohms allOf: + - if: + properties: + compatible: + contains: + const: adi,ltc4284 + then: + required: + - adi,rsense2-nano-ohms + - adi,radc-nano-ohms + else: + properties: + adi,rsense2-nano-ohms: false + adi,radc-nano-ohms: false + - if: properties: adi,pgio1-func: @@ -269,4 +303,19 @@ examples: #gpio-cells = <2>; }; }; + + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + swap-controller@20 { + compatible = "adi,ltc4284"; + reg = <0x20>; + + adi,rsense-nano-ohms = <1000>; + adi,rsense2-nano-ohms = <1000>; + adi,radc-nano-ohms = <500>; + }; + }; ... -- 2.34.1