linux-kernel - [PATCH v2 0/9] X-Powers Power Supply Improvements

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Date:   Sat,  4 Jan 2020 19:24:07 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Chen-Yu Tsai <wens@...e.org>, Sebastian Reichel <sre@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Oskari Lemmela <oskari@...mela.net>,
        Quentin Schulz <quentin.schulz@...tlin.com>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, Samuel Holland <samuel@...lland.org>
Subject: [PATCH v2 0/9] X-Powers Power Supply Improvements

This series adds some improvements to the axp20x* power supply drivers
to better support suspend/resume and use on mobile devices.

The first two patches fix bugs I found while testing the ONLINE control
added in later patches.

Patches 3 and 7 allow userspace to take the power supplies offline.
Patches 4 and 8 allow userspace to control the wakeup behavior.

Patch 9 avoids polling USB VBUS presence when possible. While working on
the RSB driver, I was seeing ~50 transfers per second, while idle and
tracked it down to this VBUS polling (20 reads/second). The polling
often caused the CPU to clock up and back down, which triggered the
remaining transfers (changes to the CPU voltage).

Unfortunately, I don't see a way to avoid the polling when running on
battery (where it matters most), other than to move the polling back to
the USB PHY driver.

Changes since v1:
 - Add patches 1-2
 - Shift value properly in calls to regmap_update_bits (3, 7)
 - Use #ifdef instead of #if to avoid -Wundef warnings (4, 8)
 - Poll once after an IRQ, instead of setting power->online in the IRQ (9)
 - Poll once on resume, in case the state changed during suspend (9)

Samuel Holland (9):
  mfd: axp20x: Mark AXP20X_VBUS_IPSOUT_MGMT as volatile
  power: supply: axp20x_ac_power: Fix reporting online status
  power: supply: axp20x_ac_power: Allow offlining
  power: supply: axp20x_ac_power: Add wakeup control
  power: supply: axp20x_usb_power: Remove unused device_node
  power: supply: axp20x_usb_power: Use a match structure
  power: supply: axp20x_usb_power: Allow offlining
  power: supply: axp20x_usb_power: Add wakeup control
  power: supply: axp20x_usb_power: Only poll while offline

 drivers/mfd/axp20x.c                    |   2 +-
 drivers/power/supply/axp20x_ac_power.c  | 131 +++++++++++---
 drivers/power/supply/axp20x_usb_power.c | 220 ++++++++++++++++++------
 3 files changed, 276 insertions(+), 77 deletions(-)

-- 
2.23.0