[PATCH v2 2/2] arm64: dts: ti: k3-j721e-main: Add ICSSG MDIO nodes

[Suman Anna]

The ICSSGs on K3 J721E SoCs contain an MDIO controller that can
be used to control external PHYs associated with the Industrial
Ethernet peripherals within each ICSSG instance. The MDIO module
used within the ICSSG is similar to the MDIO Controller used
in TI Davinci SoCs. A bus frequency of 1 MHz is chosen for the
MDIO operations.

The nodes are added and enabled in the common k3-j721e-main.dtsi
file by default, and disabled in the existing J721E board dts
file. These nodes need pinctrl lines, and so should be enabled
only on boards where they are actually wired and pinned out for
ICSSG Ethernet. Any new board dts file should disable these if
they are not sure.

Signed-off-by: Suman Anna <s-anna at ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko at ti.com>
---
 .../dts/ti/k3-j721e-common-proc-board.dts     |  8 ++++++++
 arch/arm64/boot/dts/ti/k3-j721e-main.dtsi     | 20 +++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
index 351bb84db65b..1991f620d94b 100644
--- a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
@@ -718,3 +718,11 @@ &pcie3_ep {
 &dss {
 	status = "disabled";
 };
+
+&icssg0_mdio {
+	status = "disabled";
+};
+
+&icssg1_mdio {
+	status = "disabled";
+};
diff --git a/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
index 3bcafe4c1742..598613876b0f 100644
--- a/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
@@ -1794,6 +1794,16 @@ tx_pru0_1: txpru at c000 {
 			reg-names = "iram", "control", "debug";
 			firmware-name = "j7-txpru0_1-fw";
 		};
+
+		icssg0_mdio: mdio at 32400 {
+			compatible = "ti,davinci_mdio";
+			reg = <0x32400 0x100>;
+			clocks = <&k3_clks 119 1>;
+			clock-names = "fck";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			bus_freq = <1000000>;
+		};
 	};
 
 	icssg1: icssg at b100000 {
@@ -1925,5 +1935,15 @@ tx_pru1_1: txpru at c000 {
 			reg-names = "iram", "control", "debug";
 			firmware-name = "j7-txpru1_1-fw";
 		};
+
+		icssg1_mdio: mdio at 32400 {
+			compatible = "ti,davinci_mdio";
+			reg = <0x32400 0x100>;
+			clocks = <&k3_clks 120 4>;
+			clock-names = "fck";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			bus_freq = <1000000>;
+		};
 	};
 };
-- 
2.30.1