| From: |
| Petri Karhula via B4 Relay <devnull+petri.karhula.novatron.fi-AT-kernel.org> |
| To: |
| Thomas Richard <thomas.richard-AT-bootlin.com>, Lee Jones <lee-AT-kernel.org>, Daniel Thompson <danielt-AT-kernel.org>, Jingoo Han <jingoohan1-AT-gmail.com>, Helge Deller <deller-AT-gmx.de> |
| Subject: |
| [PATCH v4 0/2] Backlight driver to control backlight behind Congatec Board Controller. |
| Date: |
| Thu, 27 Nov 2025 15:21:58 +0000 |
| Message-ID: |
| <20251127-cgbc-backlight-v4-0-626523b7173d@novatron.fi> |
| Cc: |
| linux-kernel-AT-vger.kernel.org, dri-devel-AT-lists.freedesktop.org, linux-fbdev-AT-vger.kernel.org, Petri Karhula <petri.karhula-AT-novatron.fi> |
| Archive-link: |
| Article |
This driver provides backlight brightness control through the Linux
backlight subsystem. It communicates with the board controller to
adjust LCD backlight using PWM signals. Communication is done
through Congatec Board Controller core driver.
Signed-off-by: Petri Karhula <petri.karhula@novatron.fi>
---
Changes in v4:
- Factor out brightness read into a helper
- Set backlight_properties.scale to BACKLIGHT_SCALE_LINEAR
- Link to v3: https://lore.kernel.org/r/20251125-cgbc-backlight-v3-0-18...
Changes in v3:
- Fixed review comments and simplified the structure of the driver
- Link to v2: https://lore.kernel.org/r/20251119-cgbc-backlight-v2-0-4d...
Changes in v2:
- Separated Board Controller core driver change into its own patch
- Link to v1: https://lore.kernel.org/r/20251118-cgbc-backlight-v1-1-cc...
---
Petri Karhula (2):
backlight: Add Congatec Board Controller (CGBC) backlight support
mfd: cgbc: Add support for backlight
drivers/mfd/cgbc-core.c | 1 +
drivers/video/backlight/Kconfig | 11 +++
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/cgbc_bl.c | 179 ++++++++++++++++++++++++++++++++++++++
4 files changed, 192 insertions(+)
---
base-commit: ac3fd01e4c1efce8f2c054cdeb2ddd2fc0fb150d
change-id: 20251118-cgbc-backlight-35c1109db0b8
Best regards,
--
Petri Karhula <petri.karhula@novatron.fi>
