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([2804:14c:485:4b61:8863:100d:2a2a:9a74]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-11b060885e3sm65842955c88.0.2025.11.18.18.30.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Nov 2025 18:30:15 -0800 (PST) From: Fabio Estevam To: neil.armstrong@linaro.org Cc: Laurent.pinchart@ideasonboard.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, imx@lists.linux.dev, Frank.li@nxp.com, Fabio Estevam Subject: [PATCH v2 1/2] dt-bindings: display: bridge: ldb: Document nxp,enable-termination-resistor Date: Tue, 18 Nov 2025 23:29:45 -0300 Message-Id: <20251119022946.268748-1-festevam@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Document the optional nxp,enable-termination-resistor property for the i.MX LVDS display bridge. This boolean property indicates that the built-in 100 Ohm termination resistor on the LVDS output is enabled. It is controlled via the HS_EN bit in the LVDS_CTRL register. Enabling the resistor can improve LVDS signal quality and may prevent visual artifacts on some boards, but increases the power consumption. Signed-off-by: Fabio Estevam --- Changes since v1: - Change the property name to nxp,enable-termination-resistor (Frank). .../devicetree/bindings/display/bridge/fsl,ldb.yaml | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml index 07388bf2b90d..6bc786204e65 100644 --- a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml +++ b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml @@ -35,6 +35,15 @@ properties: - const: ldb - const: lvds + nxp,enable-termination-resistor: + type: boolean + description: + Indicates that the built-in 100 Ohm termination resistor on the LVDS + output is enabled. This property is optional and controlled via the + HS_EN bit in the LVDS_CTRL register. Enabling it can improve signal + quality and prevent visual artifacts on some boards, but increases + power consumption. + ports: $ref: /schemas/graph.yaml#/properties/ports -- 2.34.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C19D9CEE35E for ; Wed, 19 Nov 2025 02:30:18 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 21B1B10E551; Wed, 19 Nov 2025 02:30:18 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="YgahwC+H"; dkim-atps=neutral Received: from mail-pj1-f47.google.com (mail-pj1-f47.google.com [209.85.216.47]) by gabe.freedesktop.org (Postfix) with ESMTPS id 600FF10E551 for ; Wed, 19 Nov 2025 02:30:16 +0000 (UTC) Received: by mail-pj1-f47.google.com with SMTP id 98e67ed59e1d1-343ea89896eso6204652a91.2 for ; Tue, 18 Nov 2025 18:30:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1763519416; x=1764124216; darn=lists.freedesktop.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=IAUl3DvNF4a96OMaEmiq14uCqbdByDkYT7FAGSKW29g=; b=YgahwC+H+X0/qmQFUigc9V5pXEHE77OlUaMoUWJK+FSIdxD9Cp5DM+f05onKF1cluL LHvUMeE4hSunfXty00NOZ6zeJ6PeRK5O4afxgs4KlbBY/aRtYz7nphqFUywZlPIkJ8rt p/X4fKgwEWoa9wWneNIybj1Fi87QezIK3p18ZHZlZW4kLzSLH4pmYZMQ9JH/9lVuG2M0 6+3VnaKM0I6ASLcAFjQ+TtIDnI36aOIONppoQS8fA7sp/316SBoBkl4H+YYwoPpBGZYF O+B97qhBqSi1RlJnNFoAhbiz3E50EO/+IN6mvvn11F8S0QyzT/hU60g7bVgNV/g1DhJs t12g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763519416; x=1764124216; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=IAUl3DvNF4a96OMaEmiq14uCqbdByDkYT7FAGSKW29g=; b=aB4Eyya+M9ZnmzuTxgUCbI41gHeShaZ5GUKN5rTo4dnoS2UiJjhCX/fQlLoyNUq832 jVsSo39wx4UD90AOtAsaLKub8r3ZpIQjPXAotYEBHDJCRiez6QQhhoygxAa14g+MmBJv rzP7xi5WXIyRHw5xHJZ0wavSn19qoKr/QamSCZlvA4h526IE+prwbh4uKh6uILdcMPAL 1i80pm7KauEIifiNFvoQ6gxeJHZl8hCIGVwhNmG7FqFJb9e4YN0Ho/ESO4bK591rLXFZ xjj7UXHJWKbhG0+Xn4vywlv+Zw6B97YScJHSJ31o0lMwf7MjM+DHjIPrvyvw9sUNc4vo PwKw== X-Forwarded-Encrypted: i=1; AJvYcCUx5XPJgkneGhYfy13KRbZbuZSqGrpnUS9K6qsgQ0plRDNaZSA0wyoRcikWXQXsESxhB1dU6zuL+R4=@lists.freedesktop.org X-Gm-Message-State: AOJu0YwzOSPTCFZwC1rBTFhCspqse2jHQXnCO3mluEoaEvQkHnaaMO7M Ksd/GZ4AXDsQFPdthI7v7HWmy+nF1RL6wFxCA8MOm7QJnUip6hzkjuug X-Gm-Gg: ASbGnctzlpCj9sGSx19KO/PT8y+feUfXLERVyoJQ5/BCzu6P55FP8+l9NX7di5zDSpj /cWjpSgoucFXHi2/0SwhDO+qWAV2ibDgWdCwG9FmOmsvroNNUftM7dfy5qlxFYKlTFNq4QEizdo dB4YU9WpPsVfnP89wFOdLi6xP8Y1SIqrfWHeFRTnNGqd4gOrk6auzNd+GaxpBvTJJUJvQ8eeEnV x8KgMAPQM+fItgCOz/GI02JfeSo0meKoHt37Cqpw/WoD3REKwxjkQolz9anpWVQr8ioTOaWifVw mfv2p6XCFZCpzDyacOpl2xRZXz8NkUJwJm7rTNYdbbZOX1kouoDowHYXG7Ieb0Gd8BmVN33Wu7+ RqGAie4UEMHzWjKF7Ga3V+A8HZtR6Rr+I6fDpxMqINBFpF5XtYsUbG0bdZIkkSPhe8nHtJ+9mht yaDlOJNVFE5Y7SjVqayLMqBd0o6VSiludATLU= X-Google-Smtp-Source: AGHT+IFh8r79lVQpAeCYF0NNbGC4p1MGfSUZomtiu+dfIgiNGPVRw/+zobtyaOULhCb1FmLl6qDzjQ== X-Received: by 2002:a05:7022:d8e:b0:119:e569:f258 with SMTP id a92af1059eb24-11b40e7b689mr5344109c88.1.1763519415678; Tue, 18 Nov 2025 18:30:15 -0800 (PST) Received: from fabio-Precision-3551.. ([2804:14c:485:4b61:8863:100d:2a2a:9a74]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-11b060885e3sm65842955c88.0.2025.11.18.18.30.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Nov 2025 18:30:15 -0800 (PST) From: Fabio Estevam To: neil.armstrong@linaro.org Cc: Laurent.pinchart@ideasonboard.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, imx@lists.linux.dev, Frank.li@nxp.com, Fabio Estevam Subject: [PATCH v2 1/2] dt-bindings: display: bridge: ldb: Document nxp, enable-termination-resistor Date: Tue, 18 Nov 2025 23:29:45 -0300 Message-Id: <20251119022946.268748-1-festevam@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Document the optional nxp,enable-termination-resistor property for the i.MX LVDS display bridge. This boolean property indicates that the built-in 100 Ohm termination resistor on the LVDS output is enabled. It is controlled via the HS_EN bit in the LVDS_CTRL register. Enabling the resistor can improve LVDS signal quality and may prevent visual artifacts on some boards, but increases the power consumption. Signed-off-by: Fabio Estevam --- Changes since v1: - Change the property name to nxp,enable-termination-resistor (Frank). .../devicetree/bindings/display/bridge/fsl,ldb.yaml | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml index 07388bf2b90d..6bc786204e65 100644 --- a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml +++ b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml @@ -35,6 +35,15 @@ properties: - const: ldb - const: lvds + nxp,enable-termination-resistor: + type: boolean + description: + Indicates that the built-in 100 Ohm termination resistor on the LVDS + output is enabled. This property is optional and controlled via the + HS_EN bit in the LVDS_CTRL register. Enabling it can improve signal + quality and prevent visual artifacts on some boards, but increases + power consumption. + ports: $ref: /schemas/graph.yaml#/properties/ports -- 2.34.1