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Sun, 05 Jul 2026 01:53:34 -0700 (PDT) From: Avermoal To: Jonathan Cameron Cc: David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Michal Simek , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Avermoal Subject: [PATCH] dt-bindings: iio: adc: convert Xilinx XADC bindings to YAML Date: Sun, 5 Jul 2026 14:53:08 +0600 Message-ID: <20260705085308.8819-2-avermoal@gmail.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Convert the Xilinx XADC binding documentation from .txt to YAML format. This conversion is part of the ongoing effort to migrate all DT bindings to a machine-verifiable schema. The new xilinx-xadc.yaml file was created from the original .txt and includes all necessary properties, descriptions, and examples. The conversion also fixes a minor typo in the 'xlnx,channels' property name. Signed-off-by: Avermoal --- .../bindings/iio/adc/xilinx-xadc.txt | 141 ------------- .../bindings/iio/adc/xilinx-xadc.yaml | 186 ++++++++++++++++++ 2 files changed, 186 insertions(+), 141 deletions(-) delete mode 100644 Documentation/devicetree/bindings/iio/adc/xilinx-xadc.txt create mode 100644 Documentation/devicetree/bindings/iio/adc/xilinx-xadc.yaml diff --git a/Documentation/devicetree/bindings/iio/adc/xilinx-xadc.txt b/Documentation/devicetree/bindings/iio/adc/xilinx-xadc.txt deleted file mode 100644 index f42e18078376..000000000000 --- a/Documentation/devicetree/bindings/iio/adc/xilinx-xadc.txt +++ /dev/null @@ -1,141 +0,0 @@ -Xilinx XADC device driver - -This binding document describes the bindings for the Xilinx 7 Series XADC as well -as the UltraScale/UltraScale+ System Monitor. - -The Xilinx XADC is an ADC that can be found in the Series 7 FPGAs from Xilinx. -The XADC has a DRP interface for communication. Currently two different -frontends for the DRP interface exist. One that is only available on the ZYNQ -family as a hardmacro in the SoC portion of the ZYNQ. The other one is available -on all series 7 platforms and is a softmacro with a AXI interface. This binding -document describes the bindings for both of them since the bindings are very -similar. - -The Xilinx System Monitor is an ADC that is found in the UltraScale and -UltraScale+ FPGAs from Xilinx. The System Monitor provides a DRP interface for -communication. Xilinx provides a standard IP core that can be used to access the -System Monitor through an AXI interface in the FPGA fabric. This IP core is -called the Xilinx System Management Wizard. This document describes the bindings -for this IP. - -Required properties: - - compatible: Should be one of - * "xlnx,zynq-xadc-1.00.a": When using the ZYNQ device - configuration interface to interface to the XADC hardmacro. - * "xlnx,axi-xadc-1.00.a": When using the axi-xadc pcore to - interface to the XADC hardmacro. - * "xlnx,system-management-wiz-1.3": When using the - Xilinx System Management Wizard fabric IP core to access the - UltraScale and UltraScale+ System Monitor. - - reg: Address and length of the register set for the device - - interrupts: Interrupt for the XADC control interface. - - clocks: When using the ZYNQ this must be the ZYNQ PCAP clock, - when using the axi-xadc or the axi-system-management-wizard this must be - the clock that provides the clock to the AXI bus interface of the core. - -Optional properties: - - xlnx,external-mux: - * "none": No external multiplexer is used, this is the default - if the property is omitted. - * "single": External multiplexer mode is used with one - multiplexer. - * "dual": External multiplexer mode is used with two - multiplexers for simultaneous sampling. - - xlnx,external-mux-channel: Configures which pair of pins is used to - sample data in external mux mode. - Valid values for single external multiplexer mode are: - 0: VP/VN - 1: VAUXP[0]/VAUXN[0] - 2: VAUXP[1]/VAUXN[1] - ... - 16: VAUXP[15]/VAUXN[15] - Valid values for dual external multiplexer mode are: - 1: VAUXP[0]/VAUXN[0] - VAUXP[8]/VAUXN[8] - 2: VAUXP[1]/VAUXN[1] - VAUXP[9]/VAUXN[9] - ... - 8: VAUXP[7]/VAUXN[7] - VAUXP[15]/VAUXN[15] - - This property needs to be present if the device is configured for - external multiplexer mode (either single or dual). If the device is - not using external multiplexer mode the property is ignored. - - xnlx,channels: List of external channels that are connected to the ADC - Required properties: - * #address-cells: Should be 1. - * #size-cells: Should be 0. - - The child nodes of this node represent the external channels which are - connected to the ADC. If the property is no present no external - channels will be assumed to be connected. - - Each child node represents one channel and has the following - properties: - Required properties: - * reg: Pair of pins the channel is connected to. - 0: VP/VN - 1: VAUXP[0]/VAUXN[0] - 2: VAUXP[1]/VAUXN[1] - ... - 16: VAUXP[15]/VAUXN[15] - Note each channel number should only be used at most - once. - Optional properties: - * xlnx,bipolar: If set the channel is used in bipolar - mode. - - -Examples: - xadc@f8007100 { - compatible = "xlnx,zynq-xadc-1.00.a"; - reg = <0xf8007100 0x20>; - interrupts = <0 7 4>; - interrupt-parent = <&gic>; - clocks = <&pcap_clk>; - - xlnx,channels { - #address-cells = <1>; - #size-cells = <0>; - channel@0 { - reg = <0>; - }; - channel@1 { - reg = <1>; - }; - channel@8 { - reg = <8>; - }; - }; - }; - - xadc@43200000 { - compatible = "xlnx,axi-xadc-1.00.a"; - reg = <0x43200000 0x1000>; - interrupts = <0 53 4>; - interrupt-parent = <&gic>; - clocks = <&fpga1_clk>; - - xlnx,channels { - #address-cells = <1>; - #size-cells = <0>; - channel@0 { - reg = <0>; - xlnx,bipolar; - }; - }; - }; - - adc@80000000 { - compatible = "xlnx,system-management-wiz-1.3"; - reg = <0x80000000 0x1000>; - interrupts = <0 81 4>; - interrupt-parent = <&gic>; - clocks = <&fpga1_clk>; - - xlnx,channels { - #address-cells = <1>; - #size-cells = <0>; - channel@0 { - reg = <0>; - xlnx,bipolar; - }; - }; - }; diff --git a/Documentation/devicetree/bindings/iio/adc/xilinx-xadc.yaml b/Documentation/devicetree/bindings/iio/adc/xilinx-xadc.yaml new file mode 100644 index 000000000000..d61635516ce2 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/xilinx-xadc.yaml @@ -0,0 +1,186 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/xilinx-xadc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Xilinx 7 Series XADC and UltraScale/UltraScale+ System Monitor + +maintainers: + - Avermoal + +description: | + The Xilinx XADC is an ADC that can be found in the Series 7 FPGAs from Xilinx. + The XADC has a DRP interface for communication. Currently two different + frontends for the DRP interface exist. One that is only available on the ZYNQ + family as a hardmacro in the SoC portion of the ZYNQ. The other one is + available on all series 7 platforms and is a softmacro with an AXI interface. + This binding document describes the bindings for both of them since the + bindings are very similar. + + The Xilinx System Monitor is an ADC that is found in the UltraScale and + UltraScale+ FPGAs from Xilinx. The System Monitor provides a DRP interface + for communication. Xilinx provides a standard IP core that can be used to + access the System Monitor through an AXI interface in the FPGA fabric. + This IP core is called the Xilinx System Management Wizard. This document + describes the bindings for this IP. + +properties: + compatible: + description: | + Specifies the interface type and the target device. + - "xlnx,zynq-xadc-1.00.a" + for ZYNQ device configuration interface (hardmacro in SoC) + - "xlnx,axi-xadc-1.00.a" + for AXI pcore softmacro on all Series 7 FPGAs + - "xlnx,system-management-wiz-1.3" + for UltraScale/UltraScale+ System Monitor via AXI + enum: + - xlnx,zynq-xadc-1.00.a + - xlnx,axi-xadc-1.00.a + - xlnx,system-management-wiz-1.3 + + reg: + description: Address and length of the register set for the device. + maxItems: 1 + + interrupts: + description: Interrupt for the XADC control interface. + maxItems: 1 + + clocks: + description: | + When using the ZYNQ this must be the ZYNQ PCAP clock, + when using the axi-xadc or the axi-system-management-wizard this must be + the clock that provides the clock to the AXI bus interface of the core. + maxItems: 1 + + xlnx,external-mux: + description: | + External multiplexer mode. If omitted, defaults to "none". + - "none" – no external multiplexer (default) + - "single" – one external multiplexer + - "dual" – two external multiplexers for simultaneous sampling + $ref: /schemas/types.yaml#/definitions/string + enum: [none, single, dual] + default: none + + xlnx,external-mux-channel: + description: | + Configures which pair of pins is used to sample data in external mux mode. + For single mode: 0 (VP/VN) or 1..16 (VAUXP[0..15]/VAUXN[0..15]). + For dual mode: 1..8, where the value n corresponds to the pair + (VAUXP[n-1]/VAUXN[n-1] and VAUXP[n+7]/VAUXN[n+7]). + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 16 + + xlnx,channels: + description: | + Container for external channels that are connected to the ADC. + If this property is not present, no external channels will be assumed. + type: object + properties: + "#address-cells": + const: 1 + "#size-cells": + const: 0 + patternProperties: + "^channel@[0-9a-f]+$": + type: object + description: Each child node represents one external channel. + properties: + reg: + description: | + Pair of pins the channel is connected to. + 0: VP/VN + 1..16: VAUXP[0..15]/VAUXN[0..15] + maxItems: 1 + xlnx,bipolar: + description: If present, the channel is used in bipolar mode. + type: boolean + required: + - reg + additionalProperties: false + required: + - "#address-cells" + - "#size-cells" + additionalProperties: false + +allOf: + - if: + required: + - xlnx,external-mux + properties: + xlnx,external-mux: + enum: [single, dual] + then: + required: + - xlnx,external-mux-channel + +required: + - compatible + - reg + - interrupts + - clocks + +additionalProperties: false + +examples: + - | + xadc@f8007100 { + compatible = "xlnx,zynq-xadc-1.00.a"; + reg = <0xf8007100 0x20>; + interrupts = <0 7 4>; + interrupt-parent = <&gic>; + clocks = <&pcap_clk>; + + xlnx,channels { + #address-cells = <1>; + #size-cells = <0>; + channel@0 { + reg = <0>; + }; + channel@1 { + reg = <1>; + }; + channel@8 { + reg = <8>; + }; + }; + }; + - | + xadc@43200000 { + compatible = "xlnx,axi-xadc-1.00.a"; + reg = <0x43200000 0x1000>; + interrupts = <0 53 4>; + interrupt-parent = <&gic>; + clocks = <&fpga1_clk>; + + xlnx,channels { + #address-cells = <1>; + #size-cells = <0>; + channel@0 { + reg = <0>; + xlnx,bipolar; + }; + }; + }; + - | + adc@80000000 { + compatible = "xlnx,system-management-wiz-1.3"; + reg = <0x80000000 0x1000>; + interrupts = <0 81 4>; + interrupt-parent = <&gic>; + clocks = <&fpga1_clk>; + + xlnx,channels { + #address-cells = <1>; + #size-cells = <0>; + channel@0 { + reg = <0>; + xlnx,bipolar; + }; + }; + }; +... -- Changes in v2: - Fix conditional requirement for xlnx,external-mux-channel (add if/required block) - Correct reg type in child nodes (use maxItems: 1 instead of items) - Make #address-cells and #size-cells required under xlnx,channels 2.52.0