[v4,0/4] Add channel type support to pwm-cros-ec

Message

Fabio Baltieri April 14, 2022, 9:28 a.m. UTC

Hi,

The ChromiumOS EC PWM host command protocol supports specifying the
requested PWM by type rather than channel. [1]

This series adds support for specifying PWM by type rather than channel
number in the pwm-cros-ec driver, which abstracts the node definitions
from the actual hardware configuration from the kernel perspective,
aligns the API with the one used by the bootloader, and allows removing
some dtsi overrides.

Tested on a sc7180-trogdor board, build tested on x86.

Changes from v3:
(https://patchwork.kernel.org/project/chrome-platform/list/?series=631131)
- actually reworded patch 2 commit description
- reworked patch 2 to use of_device_is_compatible() instead of compatible .data

Changes from v2:
(https://patchwork.kernel.org/project/chrome-platform/list/?series=627837)
- reworded patch 2 commit description
- reworked the driver and dt documentation to use a new compatible rather than
  boolean property
- dropped the comment about build test only, tested on actual hardware
  (trogdor), build test on x86 (with CONFIG_OF=n).

Changes from v1:
(https://patchwork.kernel.org/project/chrome-platform/list/?series=625182)
- fixed the dt include file license
- fixed the property name (s/_/-/)
- rebased on current linus tree (few dts files changed from a soc tree
  pull, so patch 4 needs a recent base to apply correctly)

[1] https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform/ec/common/pwm.c;l=24
[2] https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform/depthcharge/src/drivers/ec/cros/ec.c;l=1271-1273

Fabio Baltieri (4):
  dt-bindings: add mfd/cros_ec definitions
  pwm: pwm-cros-ec: add channel type support
  dt-bindings: update google,cros-ec-pwm documentation
  arm64: dts: address cros-ec-pwm channels by type

 .../bindings/pwm/google,cros-ec-pwm.yaml      |  9 +-
 .../mt8183-kukui-jacuzzi-fennel-sku1.dts      |  4 +-
 .../dts/mediatek/mt8183-kukui-jacuzzi.dtsi    |  4 +-
 .../arm64/boot/dts/mediatek/mt8183-kukui.dtsi |  1 +
 .../boot/dts/qcom/sc7180-trogdor-coachz.dtsi  |  4 -
 arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi  |  9 +-
 .../qcom/sc7280-herobrine-herobrine-r0.dts    |  7 +-
 .../arm64/boot/dts/qcom/sc7280-herobrine.dtsi |  7 +-
 .../arm64/boot/dts/qcom/sc7280-idp-ec-h1.dtsi |  4 +-
 arch/arm64/boot/dts/qcom/sdm845-cheza.dtsi    |  7 +-
 .../boot/dts/rockchip/rk3399-gru-bob.dts      |  4 -
 .../dts/rockchip/rk3399-gru-chromebook.dtsi   |  5 +-
 .../boot/dts/rockchip/rk3399-gru-kevin.dts    |  4 -
 arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi  |  1 +
 drivers/pwm/pwm-cros-ec.c                     | 82 +++++++++++++++----
 include/dt-bindings/mfd/cros_ec.h             | 18 ++++
 16 files changed, 121 insertions(+), 49 deletions(-)
 create mode 100644 include/dt-bindings/mfd/cros_ec.h