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Sun, 6 Sep 2026 11:24:41 +0800 (CST) From: Hongliang Yang To: peter.chen@kernel.org, gregkh@linuxfoundation.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, krzk@kernel.org, linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: p.zabel@pengutronix.de, vkoul@kernel.org, neil.armstrong@linaro.org, pawell@cadence.com, rogerq@kernel.org Subject: [PATCH v4 1/4] dt-bindings: usb: Add CIX Sky1 USBSSP RCSU system controller Date: Sun, 6 Sep 2026 11:24:37 +0800 Message-ID: <20260906032440.470788-2-hongliang.yang@cixtech.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260906032440.470788-1-hongliang.yang@cixtech.com> References: <20260906032440.470788-1-hongliang.yang@cixtech.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SG2PEPF000B66CF:EE_|TYZPR06MB7074:EE_ Content-Type: text/plain X-MS-Office365-Filtering-Correlation-Id: 12980d64-a975-4efc-4c87-08df0bc66543 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|82310400026|36860700016|23010399003|1800799024|921020|6133799003|10067099003|56012099006|18002099003|22082099003|3023799007; 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The regions are exposed as syscon nodes; USBSSP glue nodes reference their per-controller registers through the cix,usb-rcsu phandle with register offsets. The per-controller RCSU control and status registers live in a shared RCSU region described by the cix,sky1-usbss-rcsu binding and are referenced through the cix,usb-rcsu phandle. Signed-off-by: Hongliang Yang --- .../bindings/usb/cix,sky1-usbss-rcsu.yaml | 46 +++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 47 insertions(+) create mode 100644 Documentation/devicetree/bindings/usb/cix,sky1-usbss-rcsu.yaml diff --git a/Documentation/devicetree/bindings/usb/cix,sky1-usbss-rcsu.yaml b/Documentation/devicetree/bindings/usb/cix,sky1-usbss-rcsu.yaml new file mode 100644 index 000000000000..d0c54fd2cd5f --- /dev/null +++ b/Documentation/devicetree/bindings/usb/cix,sky1-usbss-rcsu.yaml @@ -0,0 +1,46 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/usb/cix,sky1-usbss-rcsu.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: CIX Sky1 USBSSP RCSU system controller + +maintainers: + - Hongliang Yang + +description: + The CIX Sky1 USBSSP controllers integrate their per-instance glue + registers (AXI bus attribute configuration and controller status) + inside a shared RCSU register region in the SoC system control + aperture. This binding describes that region as a syscon, so USBSSP + glue nodes can reference their register offsets through the + cix,usb-rcsu phandle (see cix,sky1-usbssp.yaml). + +properties: + compatible: + items: + - const: cix,sky1-usbss-rcsu + - const: syscon + + reg: + maxItems: 1 + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + soc { + #address-cells = <2>; + #size-cells = <2>; + + syscon@91c0300 { + compatible = "cix,sky1-usbss-rcsu", "syscon"; + reg = <0x00 0x091c0300 0x00 0x200>; + }; + }; +... diff --git a/MAINTAINERS b/MAINTAINERS index 15011f5752a9..1408b89607ff 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2775,6 +2775,7 @@ S: Maintained T: git git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/cix.git F: Documentation/devicetree/bindings/arm/cix.yaml F: Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml +F: Documentation/devicetree/bindings/usb/cix,sky1-usbss-rcsu.yaml F: arch/arm64/boot/dts/cix/ F: drivers/mailbox/cix-mailbox.c K: \bcix\b -- 2.54.0