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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: est.tech X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM7P189MB0807.EURP189.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: abfb62b4-dbd7-48bf-a3cd-08dda2f301fd X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Jun 2025 23:04:35.0403 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: d2585e63-66b9-44b6-a76e-4f4b217d97fd X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: J609/KFeArnMmD9ojIBl0EBY3IG6weldEfPZP+HY7wPwxrd2Cr3nWMpKwTn9WiBMgfZmdIiJRC/K6jBshx+WqA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: GVXP189MB2104 Hello, This RFC series is intended as a starting point for adding support for the LTC4266, an older PSE (IEEE 802.3at+) chipset from Linear Technology. This chip has four individually controllable ports, each with its own detection, classification and current-limiting abilities. Currently, this series integrates with the PSE controller core and supports enable/disable, current and voltage reporting, classification results and will power up a v= alid IEEE 802.3at or IEEE802.3af powered device. It also (poorly) supports the power-limiting functionality in the PSE core. The complexity here is that the LTC4266 only supports limiting the current,= and so deriving a "current limit" from this power limit while staying compliant with the IEEE 802.3at/af specifications is tricky. I'm curious if folks ha= ve a better idea than the linear approximation I've used here. It is RFC because I want to clarify some confusion I have around the system-level flow for a port's power allocation. It's very likely I've mis= sed something, but it appears as though the port needs to be delivering power i= n order to set the power limit on the port. Thanks for your time, Kyle Kyle Swenson (2): dt-bindings: net: pse-pd: Describe the LTC4266 PSE chipset net: pse-pd: Add LTC4266 PSE controller driver .../bindings/net/pse-pd/lltc,ltc4266.yaml | 146 +++ drivers/net/pse-pd/Kconfig | 10 + drivers/net/pse-pd/Makefile | 1 + drivers/net/pse-pd/ltc4266.c | 919 ++++++++++++++++++ 4 files changed, 1076 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/pse-pd/lltc,ltc42= 66.yaml create mode 100644 drivers/net/pse-pd/ltc4266.c --=20 2.47.0