linux-kernel - [PATCH v2 2/2] arm64: dts: ti: k3-j722s-main: Disable "serdes_wiz0" and "serdes

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Message-ID: <20250408103606.3679505-3-s-vadapalli@ti.com>
Date: Tue, 8 Apr 2025 16:06:06 +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>, <rogerq@...nel.org>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <stable@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <srk@...com>, <s-vadapalli@...com>
Subject: [PATCH v2 2/2] arm64: dts: ti: k3-j722s-main: Disable "serdes_wiz0" and "serdes_wiz1"

Since "serdes0" and "serdes1" which are the sub-nodes of "serdes_wiz0"
and "serdes_wiz1" respectively, have been disabled in the SoC file already,
and, given that these sub-nodes will only be enabled in a board file if the
board utilizes any of the SERDES instances and the peripherals bound to
them, we end up in a situation where the board file doesn't explicitly
disable "serdes_wiz0" and "serdes_wiz1". As a consequence of this, the
following errors show up when booting Linux:

  wiz bus@...00:phy@...0000: probe with driver wiz failed with error -12
  ...
  wiz bus@...00:phy@...0000: probe with driver wiz failed with error -12

To not only fix the above, but also, in order to follow the convention of
disabling device-tree nodes in the SoC file and enabling them in the board
files for those boards which require them, disable "serdes_wiz0" and
"serdes_wiz1" device-tree nodes.

Fixes: 628e0a0118e6 ("arm64: dts: ti: k3-j722s-main: Add SERDES and PCIe support")
Cc: stable@...r.kernel.org
Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---

v1 of this patch is at:
https://lore.kernel.org/r/20250408060636.3413856-3-s-vadapalli@ti.com/
Changes since v1:
- Added "Fixes" tag and updated commit message accordingly.

Regards,
Siddharth.

 arch/arm64/boot/dts/ti/k3-j722s-main.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-j722s-main.dtsi b/arch/arm64/boot/dts/ti/k3-j722s-main.dtsi
index 6850f50530f1..beda9e40e931 100644
--- a/arch/arm64/boot/dts/ti/k3-j722s-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j722s-main.dtsi
@@ -32,6 +32,8 @@ serdes_wiz0: phy@...0000 {
 		assigned-clocks = <&k3_clks 279 1>;
 		assigned-clock-parents = <&k3_clks 279 5>;

+		status = "disabled";
+
 		serdes0: serdes@...0000 {
 			compatible = "ti,j721e-serdes-10g";
 			reg = <0x0f000000 0x00010000>;
@@ -70,6 +72,8 @@ serdes_wiz1: phy@...0000 {
 		assigned-clocks = <&k3_clks 280 1>;
 		assigned-clock-parents = <&k3_clks 280 5>;

+		status = "disabled";
+
 		serdes1: serdes@...0000 {
 			compatible = "ti,j721e-serdes-10g";
 			reg = <0x0f010000 0x00010000>;
-- 
2.34.1