linux-kernel - [PATCH v2 0/2] backlight: gpio: add support for multiple GPIOs for backlight control

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Message-Id: <20260120125036.2203995-1-tessolveupstream@gmail.com>
Date: Tue, 20 Jan 2026 18:20:34 +0530
From: Sudarshan Shetty <tessolveupstream@...il.com>
To: lee@...nel.org,
	danielt@...nel.org,
	jingoohan1@...il.com
Cc: deller@....de,
	pavel@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	dri-devel@...ts.freedesktop.org,
	linux-fbdev@...r.kernel.org,
	linux-leds@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Sudarshan Shetty <tessolveupstream@...il.com>
Subject: [PATCH v2 0/2] backlight: gpio: add support for multiple GPIOs for backlight control

Hi all,

This patch extends the gpio-backlight driver and its Device Tree
bindings to support multiple GPIOs for controlling a single
backlight device.

Some panels require more than one GPIO to enable or disable the
backlight, and previously the driver only supported a single GPIO.
With this change:
 - The driver now handles an array of GPIOs and updates all of them
   based on brightness state.
 - The Device Tree binding has been updated to allow specifying one
   or more GPIOs for a gpio-backlight node.

This approach avoids describing multiple backlight devices in DT for a
single panel.

Changes in v2:
 - Used devm_gpiod_get_array() and struct gpio_descs
 - Replaced per-index GPIO handling with descriptor array access
 - Moved the bitmap allocation to probe using devm_kcalloc().
 - Updated commit messages.

Thanks,
Anusha

Sudarshan Shetty (2):
  dt-bindings: backlight: gpio-backlight: allow multiple GPIOs
  backlight: gpio: add support for multiple GPIOs for backlight control

 .../leds/backlight/gpio-backlight.yaml        | 24 ++++++-
 drivers/video/backlight/gpio_backlight.c      | 66 +++++++++++++------
 2 files changed, 67 insertions(+), 23 deletions(-)

-- 
2.34.1