linux-kernel - [PATCH 5/6] arm64: dts: ls1028a-qds: make the QIXIS CPLD use the simple-mfd-i2c.c driver

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Message-Id: <20250430153634.2971736-6-ioana.ciornei@nxp.com>
Date: Wed, 30 Apr 2025 18:36:33 +0300
From: Ioana Ciornei <ioana.ciornei@....com>
To: Lee Jones <lee@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH 5/6] arm64: dts: ls1028a-qds: make the QIXIS CPLD use the simple-mfd-i2c.c driver

From: Vladimir Oltean <vladimir.oltean@....com>

The MDIO mux on the LS1028A-QDS never worked in mainline. The device
tree was submitted as-is, and there is a downstream driver for the QIXIS
FPGA:

https://github.com/nxp-qoriq/linux/blob/lf-6.12.y/drivers/soc/fsl/qixis_ctrl.c

That driver is very similar to the already existing drivers/mfd/simple-mfd-i2c.c,
and the hardware works with the simple-mfd-i2c driver, so there isn't
any reason to upstream the other one.

Adapt the compatible string and child node format of the FPGA node, so
that the simple-mfd-i2c driver accepts it.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
 arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts b/arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts
index 0bb2f28a0441..58b54d521d75 100644
--- a/arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts
+++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts
@@ -338,17 +338,18 @@ sgtl5000: audio-codec@a {
 	};
 
 	fpga@66 {
-		compatible = "fsl,ls1028aqds-fpga", "fsl,fpga-qixis-i2c",
-			     "simple-mfd";
+		compatible = "fsl,ls1028a-qds-qixis-i2c";
 		reg = <0x66>;
+		#address-cells = <1>;
+		#size-cells = <0>;
 
-		mux: mux-controller {
+		mux: mux-controller@54 {
 			compatible = "reg-mux";
+			reg = <0x54>;
 			#mux-control-cells = <1>;
 			mux-reg-masks = <0x54 0xf0>; /* 0: reg 0x54, bits 7:4 */
 		};
 	};
-
 };
 
 &i2c1 {
-- 
2.25.1