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4a83abcef5
This patch add a way to get and set the power limit of a PSE PI. For that it uses regulator API callbacks wrapper like get_voltage() and get/set_current_limit() as power is simply V * I. We used mW unit as defined by the IEEE 802.3-2022 standards. set_current_limit() uses the voltage return by get_voltage() and the desired power limit to calculate the current limit. get_voltage() callback is then mandatory to set the power limit. get_current_limit() callback is by default looking at a driver callback and fallback to extracting the current limit from _pse_ethtool_get_status() if the driver does not set its callback. We prefer let the user the choice because ethtool_get_status return much more information than the current limit. expand pse status with c33_pw_limit_ranges to return the ranges available to configure the power limit. Reviewed-by: Sai Krishna <saikrishnag@marvell.com> Acked-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Kory Maincent <kory.maincent@bootlin.com> Link: https://patch.msgid.link/20240704-feature_poe_power_cap-v6-4-320003204264@bootlin.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linux kernel
============
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