Message-ID: <ez5ja55dl7w7ynq2wv4efsvvqtk4xyalf4k6agtsuhpgrtlpg3@d6ghlle4cu2q>
Date: Wed, 4 Sep 2024 00:04:24 +0200
From: Sebastian Reichel <sre@...nel.org>
To: Hans de Goede <hdegoede@...hat.com>
Cc: Thomas Weißschuh <linux@...ssschuh.net>, 
	MyungJoo Ham <myungjoo.ham@...sung.com>, Chanwoo Choi <cw00.choi@...sung.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
	Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>, 
	Enric Balletbo Serra <enric.balletbo@...labora.com>, Andrey Smirnov <andrew.smirnov@...il.com>, 
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
	linux-phy@...ts.infradead.org
Subject: Re: [PATCH 0/6] power: supply: Change usb_types from an array into a
 bitmask

Hi,

On Sat, Aug 31, 2024 at 04:20:33PM GMT, Hans de Goede wrote:
> When support for the "charge_behaviour" property was added the list of
> available values was made a bitmask in power_supply_desc.
> 
> "usb_types" is very similar in that:
> 1. It is an enum
> 2. The list of available values is stored in power_supply_desc
> 3. When shown it shows all available values, with the active one surrounded
>    by square brackets.
> 
> But "usb_types" uses an array with valid enum values instead of a bitmask.
> This uses more memory then the bitmap approach and it makes it impossible
> to have a shared generic show() function for properties which show
> available values, with the active one surrounded by square brackets.
> 
> This patch-set moves "usb_types" over to a bitmask in power_supply_desc
> to indicate the available values.
> 
> Patches 1 - 3:
> 
> It turns out that the ucs1002-power driver contained a surprise in that
> it supports writing to "usb_type" even though the ABI doc says it is
> read-only. Since we cannot break shipped userspace API, the ship has sailed
> on this one. The first patch documents that writing "usb_type" is allowed,
> but only for power-supply devices which provide USB power rather then
> consume it.
> 
> Enum properties accept writing the FOO_TEXT[] string values, passing
> the enum value matching the FOO_TEXT entry to set_property(), the second
> patch adjusts ucs1002_set_usb_type() to directly accept enum values.
> 
> The rt9467 driver was another driver which allowed writing to "usb_type"
> but there the use made no sense, so it is simply dropped.
> 
> Patches 4 - 6:
> 
> These patches implement the actual moving of usb_types to a bitmask.
> 
> Patch 6 is a bit of a bigbang patch moving all drivers over in one go,
> touching a couple of drivers outside drivers/power/supply: 1 in
> drivers/extcon/ 1 in drivers/phy/ and 5 in drivers/usb/typec/ since
> the changes outside of drivers/power/supply are small I've chosen to
> make all the changes in one go rather then have some sort of
> intermediate state where both ways are supported.
> 
> For merging this I believe it would be best for an immutable branch / tag
> to be created on the linux-power-supply tree and then send a pull-request
> to the extcon, phy and usb-typec maintainers to merge the tag.
> 
> extcon, phy and typec maintainers can you please give your Acked-by for
> patch 6/6 for merging these changes through the linux-power-supply tree?
> 
> This set is based on top of the latest linux-power-supply/for-next.

As we are quite close before the merge window I just took it with
just the Ack from Greg. The changes in PHY and Extcon are quite
small. I did prepare an immutable branch in case it is needed by
any of the other involved trees:

The following changes since commit 8400291e289ee6b2bf9779ff1c83a291501f017b:

  Linux 6.11-rc1 (2024-07-28 14:19:55 -0700)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git tags/ib-psy-usb-types-signed

for you to fetch changes up to 364ea7ccaef917a3068236a19a4b31a0623b561a:

  power: supply: Change usb_types from an array into a bitmask (2024-09-03 23:20:28 +0200)

----------------------------------------------------------------
Immutable branch for usb_types change for v6.12

Changing usb_types type from array to bitmap in the power_supply_desc
struct requires updating power-supply drivers living in different
subsystem, so it is handled via an immutable branch.

----------------------------------------------------------------
Hans de Goede (6):
      power: supply: "usb_type" property may be written to
      power: supply: ucs1002: Adjust ucs1002_set_usb_type() to accept string values
      power: supply: rt9467-charger: Remove "usb_type" property write support
      power: supply: sysfs: Add power_supply_show_enum_with_available() helper
      power: supply: sysfs: Move power_supply_show_enum_with_available() up
      power: supply: Change usb_types from an array into a bitmask

 Documentation/ABI/testing/sysfs-class-power     |  7 ++-
 drivers/extcon/extcon-intel-cht-wc.c            | 15 ++----
 drivers/phy/ti/phy-tusb1210.c                   | 11 ++---
 drivers/power/supply/axp20x_usb_power.c         | 13 ++---
 drivers/power/supply/bq256xx_charger.c          | 15 ++----
 drivers/power/supply/cros_usbpd-charger.c       | 22 +++------
 drivers/power/supply/lenovo_yoga_c630_battery.c |  7 +--
 drivers/power/supply/mp2629_charger.c           | 15 ++----
 drivers/power/supply/mt6360_charger.c           | 13 ++---
 drivers/power/supply/mt6370-charger.c           | 13 ++---
 drivers/power/supply/power_supply_core.c        |  4 --
 drivers/power/supply/power_supply_sysfs.c       | 66 ++++++++-----------------
 drivers/power/supply/qcom_battmgr.c             | 37 +++++++-------
 drivers/power/supply/qcom_pmi8998_charger.c     | 13 ++---
 drivers/power/supply/rk817_charger.c            |  9 +---
 drivers/power/supply/rn5t618_power.c            | 13 ++---
 drivers/power/supply/rt9467-charger.c           | 16 ++----
 drivers/power/supply/rt9471.c                   | 15 ++----
 drivers/power/supply/ucs1002_power.c            | 26 +++++-----
 drivers/usb/typec/anx7411.c                     | 11 ++---
 drivers/usb/typec/rt1719.c                      | 11 ++---
 drivers/usb/typec/tcpm/tcpm.c                   | 11 ++---
 drivers/usb/typec/tipd/core.c                   |  9 +---
 drivers/usb/typec/ucsi/psy.c                    | 11 ++---
 include/linux/power_supply.h                    |  3 +-
 25 files changed, 132 insertions(+), 254 deletions(-)

-- Sebastian

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