linux-kernel - [PATCH v9 6/9] arm64: dts: ti: k3-j721s2-common-proc-board: Add USB support

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Message-ID: <20230220111408.9476-7-r-gunasekaran@ti.com>
Date:   Mon, 20 Feb 2023 16:44:05 +0530
From:   Ravi Gunasekaran <r-gunasekaran@...com>
To:     <nm@...com>, <afd@...com>, <vigneshr@...com>, <kristo@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <s-vadapalli@...com>, <r-gunasekaran@...com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v9 6/9] arm64: dts: ti: k3-j721s2-common-proc-board: Add USB support

From: Aswath Govindraju <a-govindraju@...com>

The board uses lane 1 of SERDES for USB. Set the mux
accordingly.

The USB controller and EVM supports super-speed for USB0
on the Type-C port. However, the SERDES has a limitation
that up to 2 protocols can be used at a time. The SERDES is
wired for PCIe, eDP and USB super-speed. It has been
chosen to use PCIe and eDP as default. So restrict
USB0 to high-speed mode.

Signed-off-by: Aswath Govindraju <a-govindraju@...com>
Signed-off-by: Matt Ranostay <mranostay@...com>
Link: https://lore.kernel.org/r/20221122101616.770050-6-mranostay@ti.com
Signed-off-by: Ravi Gunasekaran <r-gunasekaran@...com>
---
I had reviewed this patch in the v5 series [1].
Since I'm taking over upstreaming this series, I removed the self
Reviewed-by tag.

Links:
[1] - https://lore.kernel.org/all/96058a13-4903-2b8c-8de2-f37fdfd3672b@ti.com/

 .../dts/ti/k3-j721s2-common-proc-board.dts    | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
index c3a397484c70..c787d46f89de 100644
--- a/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
@@ -147,6 +147,12 @@
 			J721S2_IOPAD(0x020, PIN_INPUT, 7) /* (AA23) MCAN15_RX.GPIO0_8 */
 		>;
 	};
+
+	main_usbss0_pins_default: main-usbss0-pins-default {
+		pinctrl-single,pins = <
+			J721S2_IOPAD(0x0ec, PIN_OUTPUT, 6) /* (AG25) TIMER_IO1.USB0_DRVVBUS */
+		>;
+	};
 };
 
 &wkup_pmx0 {
@@ -318,6 +324,22 @@
 	};
 };
 
+&usb_serdes_mux {
+	idle-states = <1>; /* USB0 to SERDES lane 1 */
+};
+
+&usbss0 {
+	pinctrl-0 = <&main_usbss0_pins_default>;
+	pinctrl-names = "default";
+	ti,vbus-divider;
+	ti,usb2-only;
+};
+
+&usb0 {
+	dr_mode = "otg";
+	maximum-speed = "high-speed";
+};
+
 &mcu_mcan0 {
 	status = "okay";
 	pinctrl-names = "default";
-- 
2.17.1