linux-kernel - [PATCH] arm64: dts: ti: k3-j784s4-evm: Use 4 lanes for PCIe0 on EVM

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Message-ID: <20240720110455.3043327-1-s-vadapalli@ti.com>
Date: Sat, 20 Jul 2024 16:34:55 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <s-vadapalli@...com>
Subject: [PATCH] arm64: dts: ti: k3-j784s4-evm: Use 4 lanes for PCIe0 on EVM

The PCIe0 instance of the PCIe controller on J784S4 SoC supports up to 4
lanes. Additionally, all 4 lanes of PCIe0 can be utilized on J784S4-EVM
via SERDES1. Since SERDES1 is not being used by any peripheral apart
from PCIe0, use all 4 lanes of SERDES1 for PCIe0.

Fixes: 27ce26fe52d4 ("arm64: dts: ti: k3-j784s4-evm: Enable PCIe0 and PCIe1 in RC Mode")
Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---

Hello,

This patch is based on linux-next tagged next-20240715.
Patch has been tested on J784S4-EVM. Logs:
https://gist.github.com/Siddharth-Vadapalli-at-TI/2b9b1196ff6b9eac895a7986e5ff4456
NOTE: Patch applies cleanly on Mainline Linux's latest commit
3c3ff7be9729 Merge tag 'powerpc-6.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Regards,
Siddharth.

 arch/arm64/boot/dts/ti/k3-j784s4-evm.dts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts b/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
index ffa38f41679d..ea27519d7b89 100644
--- a/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
@@ -1407,10 +1407,11 @@ &serdes1 {

 	serdes1_pcie0_link: phy@0 {
 		reg = <0>;
-		cdns,num-lanes = <2>;
+		cdns,num-lanes = <4>;
 		#phy-cells = <0>;
 		cdns,phy-type = <PHY_TYPE_PCIE>;
-		resets = <&serdes_wiz1 1>, <&serdes_wiz1 2>;
+		resets = <&serdes_wiz1 1>, <&serdes_wiz1 2>,
+			 <&serdes_wiz1 3>, <&serdes_wiz1 4>;
 	};
 };

-- 
2.40.1