linux-kernel - [PATCH 0/3] power: supply: axp20x_usb_power: prepare for external power delivery negotiation

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Message-ID: <20240121014057.1042466-1-aren@peacevolution.org>
Date: Sat, 20 Jan 2024 20:39:58 -0500
From: Aren Moynihan <aren@...cevolution.org>
To: linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Aidan MacDonald <aidanmacdonald.0x0@...il.com>,
	Ondřej Jirman <megi@....cz>,
	Aren Moynihan <aren@...cevolution.org>,
	Chen-Yu Tsai <wens@...e.org>,
	Quentin Schulz <quentin.schulz@...tlin.com>,
	Sebastian Reichel <sre@...nel.org>
Subject: [PATCH 0/3] power: supply: axp20x_usb_power: prepare for external power delivery negotiation

Being able to set the input current limit will be necessary to implement
usb power delivery on the Pine64 PinePhone. The PinePhone has a separate
chip (anx7688) that handles usb power delivery (among other things), so
we will need a way to apply the current limit which that negotiates.

The first two patches were originally based on code Ondřej Jirman
wrote[1], but I have almost completely rewritten them.

While working on this, I also discovered that the axp803 pmic sets a
current limit of 3A on the usb port without any negotiation if it
doesn't detect a battery.

1: https://xff.cz/git/linux/commit/?h=axp-6.7&id=3dcd33dfd1ae58db159427365dcb6d0d2b12f06d

Aren Moynihan (3):
  power: supply: axp20x_usb_power: add input current limit
  power: supply: axp20x_usb_power: enable usb_type reporting
  power: supply: axp20x_usb_power: set input current limit in probe

 drivers/power/supply/axp20x_usb_power.c | 192 +++++++++++++++++++++++-
 1 file changed, 190 insertions(+), 2 deletions(-)

-- 
2.43.0