From: Boerge Struempfel <bstruempfel@data-modul.com>
To: Marek Vasut <marex@denx.de>,
Andrzej Hajda <andrzej.hajda@intel.com>,
Neil Armstrong <neil.armstrong@linaro.org>,
Robert Foss <rfoss@kernel.org>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Jonas Karlman <jonas@kwiboo.se>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>
Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
Boerge Struempfel <bstruempfel@data-modul.com>
Subject: [PATCH v2 0/2] drm/bridge: lt9211: Add drive-strength-microamp DT property
Date: Wed, 13 May 2026 15:31:25 +0200 [thread overview]
Message-ID: <20260513133127.376458-1-bstruempfel@data-modul.com> (raw)
The LT9211 LVDS TX output driver current is currently hardcoded to
0x8 (~25 uA). Some board layouts require a different drive strength
to meet signal integrity requirements.
This series adds support for the standard 'drive-strength-microamp'
DT property, allowing board DTs to select one of sixteen discrete
current levels between 12 uA and 36 uA. The default preserves the
existing behaviour.
Changes in v2:
- Use u8 instead of u32 for the lookup table array (values fit in u8)
- Warn when drive-strength-microamp exists in DT but is malformed
Link to v1: https://lore.kernel.org/dri-devel/20260512164609.3390700-1-bstruempfel@data-modul.com/
Boerge Struempfel (2):
dt-bindings: display/bridge: lt9211: Add drive-strength-microamp
property
drm/bridge: lt9211: Add drive-strength-microamp DT property
.../display/bridge/lontium,lt9211.yaml | 7 +++++
drivers/gpu/drm/bridge/lontium-lt9211.c | 31 ++++++++++++++++++-
2 files changed, 37 insertions(+), 1 deletion(-)
--
2.54.0
next reply other threads:[~2026-05-13 13:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-13 13:31 Boerge Struempfel [this message]
2026-05-13 13:31 ` [PATCH v2 1/2] dt-bindings: display/bridge: lt9211: Add drive-strength-microamp property Boerge Struempfel
2026-05-13 13:41 ` Marek Vasut
2026-05-13 13:31 ` [PATCH v2 2/2] drm/bridge: lt9211: Add drive-strength-microamp DT property Boerge Struempfel
2026-05-13 13:45 ` Marek Vasut
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