linux-kernel - [PATCH 3/3] arm64: dts: imx8mm-phyboard-polis-peb-av-10: Set custom lvds

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Message-Id: <20241127103031.1007893-4-andrej.picej@norik.com>
Date: Wed, 27 Nov 2024 11:30:31 +0100
From: Andrej Picej <andrej.picej@...ik.com>
To: andrzej.hajda@...el.com,
	neil.armstrong@...aro.org,
	rfoss@...nel.org,
	Laurent.pinchart@...asonboard.com,
	jonas@...boo.se,
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	airlied@...il.com,
	simona@...ll.ch,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com,
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Cc: dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 3/3] arm64: dts: imx8mm-phyboard-polis-peb-av-10: Set custom lvds_vcom

Set custom differential output voltage for LVDS, to fulfill requirements
of the connected display. LVDS diferential voltage for data-lanes and
clock output has to be between 200 mV and 600 mV.
Driver sets 200 Ohm near-end termination by default and since
LVDS_VCOM_CHA_LVDS_VOD_SWING (0x19) [3:2] sets both data-lane and clock
output voltage we have to set the register to the value of 0x0C (0b11 <<
2):
- Steady-state differential output voltage for LVDS data-lanes:
  min: 300 mV, typ: 402 mV, max: 511 mV
- Steady-state differential output voltage for LVDS clock lane:
  min: 234 mV, typ: 314 mV, max: 399 mV

Signed-off-by: Andrej Picej <andrej.picej@...ik.com>
---
 .../boot/dts/freescale/imx8mm-phyboard-polis-peb-av-10.dtso      | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-phyboard-polis-peb-av-10.dtso b/arch/arm64/boot/dts/freescale/imx8mm-phyboard-polis-peb-av-10.dtso
index a9de42cf14be..709b555ca753 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-phyboard-polis-peb-av-10.dtso
+++ b/arch/arm64/boot/dts/freescale/imx8mm-phyboard-polis-peb-av-10.dtso
@@ -179,6 +179,7 @@ port@0 {
 			bridge_in: endpoint {
 				remote-endpoint = <&dsi_out>;
 				data-lanes = <1 2 3 4>;
+				ti,lvds-vcom = <0x0C>;
 			};
 		};
 
-- 
2.34.1