linux-kernel - [PATCH v2 0/1] dt-bindings: backlight: mp3309c: remove two required properties

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Date:   Wed, 25 Oct 2023 17:50:56 +0200
From:   Flavio Suligoi <f.suligoi@...m.it>
To:     Lee Jones <lee@...nel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Helge Deller <deller@....de>, Pavel Machek <pavel@....cz>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Flavio Suligoi <f.suligoi@...m.it>
Subject: [PATCH v2 0/1] dt-bindings: backlight: mp3309c: remove two required properties

This patch remove the following two not-required properties from the
"required" section:

- max-brightness
- default brightness

These properties are not really required, so they can be removed from the
"required" section.
The "max-brightness" is no longer used in the current version
of the driver (it was used only in the first version).
The "default-brightness", if omitted in the DT, is managed by the
device driver, using a default value. This value depends on the dimming
mode used:

- for the "analog mode", via I2C commands, this value is fixed by
  hardware (=31);
- while in case of pwm mode the default used is the last value of the
  brightness-levels array.

Also the brightness-levels array is not required:

- in "analog mode", via I2C commands, the brightness-level array is
  fixed by hardware (0..31);
- in pwm dimming mode, the driver uses a default array of 0..255 and
  the "default-brightness" is the last one, which is "255".

NOTE: there are no compatibility problems with the previous version,
      since the device driver has not yet been included in any kernel.
      Only this dt-binding yaml file is already included in the
      "for-backlight-next" branch of the "backlight" kernel repository.
      No developer may have used it.

Other changes:

- improve the backlight working mode descripion in the "description"
  section
- update the example, removing the "max-brightness" and introducing the
  "brightess-levels" property

NOTE: the "brightess-levels" property is present in the last version of the
      common.yaml file, so it is not decalared here.
      For this last version of common.yaml file, see my patch:
      
[1/1] dt-bindings: backlight: add brightness-levels related common
 properties
commit: d5272d39995f4150062a67e6f2cef556edece740

Flavio Suligoi (1):
  dt-bindings: backlight: mp3309c: remove two required properties

 .../bindings/leds/backlight/mps,mp3309c.yaml           | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

-- 
2.34.1