linux-kernel - [PATCH v2 3/3] arm64: dts: ti: k3-am64: Add PCIe PHY latency DT binding

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Date:   Thu, 27 Apr 2023 07:50:32 +0200
From:   Dominic Rath <rath@...-augsburg.de>
To:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        tjoseph@...ence.com
Cc:     bhelgaas@...gle.com, lpieralisi@...nel.org, nm@...com,
        vigneshr@...com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        christian.gmeiner@...il.com, bahle@...-augsburg.de,
        Dominic Rath <rath@...-augsburg.de>
Subject: [PATCH v2 3/3] arm64: dts: ti: k3-am64: Add PCIe PHY latency DT binding

From: Alexander Bahle <bahle@...-augsburg.de>

Add DT bindings for the PCIe PHY latencies. Applies to PCIe in host and
endpoint mode. Setting these improves the PTM timestamp accuracy.

The values are taken from the Link below.

Signed-off-by: Alexander Bahle <bahle@...-augsburg.de>
Signed-off-by: Dominic Rath <rath@...-augsburg.de>
Link: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/998749/am6442-details-regarding-ptm-implementation
---
 arch/arm64/boot/dts/ti/k3-am642-evm.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am642-evm.dts b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
index 39feea78a084..f448c98f1aa1 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
@@ -552,6 +552,8 @@ serdes0_pcie_link: phy@0 {
 		#phy-cells = <0>;
 		cdns,phy-type = <PHY_TYPE_PCIE>;
 		resets = <&serdes_wiz0 1>;
+		tx-phy-latency-ps = <138800 69400>;
+		rx-phy-latency-ps = <185200 92600>;
 	};
 };
 
-- 
2.36.0