Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Dominic Rath <dominic.rath@ibv-augsburg.de>
To:     robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
        tjoseph@cadence.com
Cc:     bhelgaas@google.com, lpieralisi@kernel.org, nm@ti.com,
        vigneshr@ti.com, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
        Alexander Bahle <bahle@ibv-augsburg.de>,
        Dominic Rath <rath@ibv-augsburg.de>
Subject: [PATCH 3/3] arm64: dts: ti: k3-am64-main: Add latency DT binding
Date:   Thu, 13 Oct 2022 08:26:49 +0200
Message-Id: <20221013062649.303184-4-dominic.rath@ibv-augsburg.de>
In-Reply-To: <20221013062649.303184-1-dominic.rath@ibv-augsburg.de>
References: <20221013062649.303184-1-dominic.rath@ibv-augsburg.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Alexander Bahle <bahle@ibv-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@ibv-augsburg.de>
Signed-off-by: Dominic Rath <rath@ibv-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@f102000 {
 		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@f102000 {
@@ -873,6 +875,8 @@ pcie0_ep: pcie-ep@f102000 {
 		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@23000000 {
-- 
2.36.0