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

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Date:   Thu, 13 Oct 2022 08:26:49 +0200
From:   Dominic Rath <dominic.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,
        Alexander Bahle <bahle@...-augsburg.de>,
        Dominic Rath <rath@...-augsburg.de>
Subject: [PATCH 3/3] arm64: dts: ti: k3-am64-main: Add latency DT binding

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

Add DT bindings for the PCIe PHY latencies 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-am64-main.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
index d6aa23681bbe..032abb343c36 100644
--- a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
@@ -855,6 +855,8 @@ pcie0_rc: pcie@...2000 {
 		ranges = <0x01000000 0x00 0x68001000  0x00 0x68001000  0x00 0x0010000>,
 			 <0x02000000 0x00 0x68011000  0x00 0x68011000  0x00 0x7fef000>;
 		dma-ranges = <0x02000000 0x0 0x0 0x0 0x0 0x00000010 0x0>;
+		cdns,tx-phy-latency-ps = <138800 69400>;
+		cdns,rx-phy-latency-ps = <185200 92600>;
 	};
 
 	pcie0_ep: pcie-ep@...2000 {
@@ -873,6 +875,8 @@ pcie0_ep: pcie-ep@...2000 {
 		clocks = <&k3_clks 114 0>;
 		clock-names = "fck";
 		max-functions = /bits/ 8 <1>;
+		cdns,tx-phy-latency-ps = <138800 69400>;
+		cdns,rx-phy-latency-ps = <185200 92600>;
 	};
 
 	epwm0: pwm@...00000 {
-- 
2.36.0