linux-kernel - [PATCH 1/2] arm64: dts: ti: k3-am62: Add support for AM625 OLDI IO Control

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Message-ID: <20250913064205.4152249-2-s-jain1@ti.com>
Date: Sat, 13 Sep 2025 12:12:04 +0530
From: Swamil Jain <s-jain1@...com>
To: <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <jyri.sarha@....fi>,
        <tomi.valkeinen@...asonboard.com>, <maarten.lankhorst@...ux.intel.com>,
        <mripard@...nel.org>, <tzimmermann@...e.de>, <airlied@...il.com>,
        <simona@...ll.ch>, <aradhya.bhatia@...ux.dev>
CC: <h-shenoy@...com>, <devarsht@...com>, <praneeth@...com>, <u-kumar1@...com>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <s-jain1@...com>
Subject: [PATCH 1/2] arm64: dts: ti: k3-am62: Add support for AM625 OLDI IO Control

From: Aradhya Bhatia <a-bhatia1@...com>

Add TI DSS OLDI-IO control registers for AM625 DSS. This is a region of
12 32bit registers found in the TI AM625 CTRL_MMR0 register space[0].
They are used to control the characteristics of the OLDI DATA/CLK IO as
needed by the DSS display controller node.

[0]: https://www.ti.com/lit/pdf/spruiv7

Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
Signed-off-by: Swamil Jain <s-jain1@...com>
---
 arch/arm64/boot/dts/ti/k3-am62-main.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
index 029380dc1a35..dcc71db8afd4 100644
--- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
@@ -76,6 +76,11 @@ audio_refclk1: clock-controller@...4 {
 			assigned-clock-parents = <&k3_clks 157 18>;
 			#clock-cells = <0>;
 		};
+
+		dss_oldi_io_ctrl: oldi-io-controller@...0 {
+			compatible = "ti,am625-dss-oldi-io-ctrl", "syscon";
+			reg = <0x8600 0x200>;
+		};
 	};
 
 	dmss: bus@...00000 {