diff options
Diffstat (limited to 'Documentation/devicetree/bindings/spi')
14 files changed, 430 insertions, 108 deletions
diff --git a/Documentation/devicetree/bindings/spi/allwinner,sun6i-a31-spi.yaml b/Documentation/devicetree/bindings/spi/allwinner,sun6i-a31-spi.yaml index 0565dc49e449..243a6b1e66ea 100644 --- a/Documentation/devicetree/bindings/spi/allwinner,sun6i-a31-spi.yaml +++ b/Documentation/devicetree/bindings/spi/allwinner,sun6i-a31-spi.yaml @@ -18,9 +18,14 @@ properties: "#size-cells": true compatible: - enum: - - allwinner,sun6i-a31-spi - - allwinner,sun8i-h3-spi + oneOf: + - const: allwinner,sun6i-a31-spi + - const: allwinner,sun8i-h3-spi + - items: + - enum: + - allwinner,sun8i-r40-spi + - allwinner,sun50i-h6-spi + - const: allwinner,sun8i-h3-spi reg: maxItems: 1 diff --git a/Documentation/devicetree/bindings/spi/amlogic,meson-gx-spicc.yaml b/Documentation/devicetree/bindings/spi/amlogic,meson-gx-spicc.yaml index 49b617c98ae7..9147df29022a 100644 --- a/Documentation/devicetree/bindings/spi/amlogic,meson-gx-spicc.yaml +++ b/Documentation/devicetree/bindings/spi/amlogic,meson-gx-spicc.yaml @@ -22,6 +22,7 @@ properties: enum: - amlogic,meson-gx-spicc # SPICC controller on Amlogic GX and compatible SoCs - amlogic,meson-axg-spicc # SPICC controller on Amlogic AXG and compatible SoCs + - amlogic,meson-g12a-spicc # SPICC controller on Amlogic G12A and compatible SoCs interrupts: maxItems: 1 @@ -40,6 +41,27 @@ properties: items: - const: core +if: + properties: + compatible: + contains: + enum: + - amlogic,meson-g12a-spicc + +then: + properties: + clocks: + contains: + items: + - description: controller register bus clock + - description: baud rate generator and delay control clock + + clock-names: + minItems: 2 + items: + - const: core + - const: pclk + required: - compatible - reg diff --git a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt index 2d3264140cc5..33bc58f4cf4b 100644 --- a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt +++ b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt @@ -10,7 +10,10 @@ Required properties: - "fsl,imx35-cspi" for SPI compatible with the one integrated on i.MX35 - "fsl,imx51-ecspi" for SPI compatible with the one integrated on i.MX51 - "fsl,imx53-ecspi" for SPI compatible with the one integrated on i.MX53 and later Soc - - "fsl,imx8mq-ecspi" for SPI compatible with the one integrated on i.MX8M + - "fsl,imx8mq-ecspi" for SPI compatible with the one integrated on i.MX8MQ + - "fsl,imx8mm-ecspi" for SPI compatible with the one integrated on i.MX8MM + - "fsl,imx8mn-ecspi" for SPI compatible with the one integrated on i.MX8MN + - "fsl,imx8mp-ecspi" for SPI compatible with the one integrated on i.MX8MP - reg : Offset and length of the register set for the device - interrupts : Should contain CSPI/eCSPI interrupt - clocks : Clock specifiers for both ipg and per clocks. diff --git a/Documentation/devicetree/bindings/spi/qca,ar934x-spi.yaml b/Documentation/devicetree/bindings/spi/qca,ar934x-spi.yaml new file mode 100644 index 000000000000..2aa766759d59 --- /dev/null +++ b/Documentation/devicetree/bindings/spi/qca,ar934x-spi.yaml @@ -0,0 +1,41 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/spi/qca,ar934x-spi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Qualcomm Atheros AR934x/QCA95xx SoC SPI controller + +maintainers: + - Chuanhong Guo <gch981213@gmail.com> + +allOf: + - $ref: spi-controller.yaml# + +properties: + compatible: + const: qca,ar934x-spi + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + +required: + - compatible + - reg + - clocks + - '#address-cells' + - '#size-cells' + +examples: + - | + #include <dt-bindings/clock/ath79-clk.h> + spi: spi@1f000000 { + compatible = "qca,ar934x-spi"; + reg = <0x1f000000 0x1c>; + clocks = <&pll ATH79_CLK_AHB>; + #address-cells = <1>; + #size-cells = <0>; + }; diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt deleted file mode 100644 index 1d64b61f5171..000000000000 --- a/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt +++ /dev/null @@ -1,36 +0,0 @@ -Qualcomm Quad Serial Peripheral Interface (QSPI) - -The QSPI controller allows SPI protocol communication in single, dual, or quad -wire transmission modes for read/write access to slaves such as NOR flash. - -Required properties: -- compatible: An SoC specific identifier followed by "qcom,qspi-v1", such as - "qcom,sdm845-qspi", "qcom,qspi-v1" -- reg: Should contain the base register location and length. -- interrupts: Interrupt number used by the controller. -- clocks: Should contain the core and AHB clock. -- clock-names: Should be "core" for core clock and "iface" for AHB clock. - -SPI slave nodes must be children of the SPI master node and can contain -properties described in Documentation/devicetree/bindings/spi/spi-bus.txt - -Example: - - qspi: spi@88df000 { - compatible = "qcom,sdm845-qspi", "qcom,qspi-v1"; - reg = <0x88df000 0x600>; - #address-cells = <1>; - #size-cells = <0>; - interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>; - clock-names = "iface", "core"; - clocks = <&gcc GCC_QSPI_CNOC_PERIPH_AHB_CLK>, - <&gcc GCC_QSPI_CORE_CLK>; - - flash@0 { - compatible = "jedec,spi-nor"; - reg = <0>; - spi-max-frequency = <25000000>; - spi-tx-bus-width = <2>; - spi-rx-bus-width = <2>; - }; - }; diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml new file mode 100644 index 000000000000..0cf470eaf2a0 --- /dev/null +++ b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml @@ -0,0 +1,88 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) + +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/spi/qcom,spi-qcom-qspi.yaml#" +$schema: "http://devicetree.org/meta-schemas/core.yaml#" + +title: Qualcomm Quad Serial Peripheral Interface (QSPI) + +maintainers: + - Mukesh Savaliya <msavaliy@codeaurora.org> + - Akash Asthana <akashast@codeaurora.org> + +description: + The QSPI controller allows SPI protocol communication in single, dual, or quad + wire transmission modes for read/write access to slaves such as NOR flash. + +allOf: + - $ref: /spi/spi-controller.yaml# + +properties: + compatible: + items: + - const: qcom,sdm845-qspi + - const: qcom,qspi-v1 + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + clock-names: + items: + - const: iface + - const: core + + clocks: + items: + - description: AHB clock + - description: QSPI core clock + + interconnects: + minItems: 1 + maxItems: 2 + + interconnect-names: + items: + - const: qspi-config + - const: qspi-memory + +required: + - compatible + - reg + - interrupts + - clock-names + - clocks + +examples: + - | + #include <dt-bindings/clock/qcom,gcc-sdm845.h> + #include <dt-bindings/interrupt-controller/arm-gic.h> + + soc: soc@0 { + #address-cells = <2>; + #size-cells = <2>; + + qspi: spi@88df000 { + compatible = "qcom,sdm845-qspi", "qcom,qspi-v1"; + reg = <0 0x88df000 0 0x600>; + #address-cells = <1>; + #size-cells = <0>; + interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>; + clock-names = "iface", "core"; + clocks = <&gcc GCC_QSPI_CNOC_PERIPH_AHB_CLK>, + <&gcc GCC_QSPI_CORE_CLK>; + + flash@0 { + compatible = "jedec,spi-nor"; + reg = <0>; + spi-max-frequency = <25000000>; + spi-tx-bus-width = <2>; + spi-rx-bus-width = <2>; + }; + + }; + }; +... diff --git a/Documentation/devicetree/bindings/spi/spi-controller.yaml b/Documentation/devicetree/bindings/spi/spi-controller.yaml index 1e0ca6ccf64b..d8e5509a7081 100644 --- a/Documentation/devicetree/bindings/spi/spi-controller.yaml +++ b/Documentation/devicetree/bindings/spi/spi-controller.yaml @@ -52,6 +52,12 @@ properties: description: The SPI controller acts as a slave, instead of a master. +oneOf: + - required: + - "#address-cells" + - required: + - spi-slave + patternProperties: "^slave$": type: object @@ -114,7 +120,7 @@ patternProperties: - enum: [ 1, 2, 4, 8 ] - default: 1 description: - Bus width to the SPI bus used for MISO. + Bus width to the SPI bus used for read transfers. spi-rx-delay-us: description: @@ -126,7 +132,7 @@ patternProperties: - enum: [ 1, 2, 4, 8 ] - default: 1 description: - Bus width to the SPI bus used for MOSI. + Bus width to the SPI bus used for write transfers. spi-tx-delay-us: description: diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt b/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt index 162e024b95a0..30a79da9c039 100644 --- a/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt +++ b/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt @@ -1,12 +1,17 @@ ARM Freescale DSPI controller Required properties: -- compatible : "fsl,vf610-dspi", "fsl,ls1021a-v1.0-dspi", - "fsl,ls2085a-dspi" - or - "fsl,ls2080a-dspi" followed by "fsl,ls2085a-dspi" - "fsl,ls1012a-dspi" followed by "fsl,ls1021a-v1.0-dspi" - "fsl,ls1088a-dspi" followed by "fsl,ls1021a-v1.0-dspi" +- compatible : must be one of: + "fsl,vf610-dspi", + "fsl,ls1021a-v1.0-dspi", + "fsl,ls1012a-dspi" (optionally followed by "fsl,ls1021a-v1.0-dspi"), + "fsl,ls1028a-dspi", + "fsl,ls1043a-dspi" (optionally followed by "fsl,ls1021a-v1.0-dspi"), + "fsl,ls1046a-dspi" (optionally followed by "fsl,ls1021a-v1.0-dspi"), + "fsl,ls1088a-dspi" (optionally followed by "fsl,ls1021a-v1.0-dspi"), + "fsl,ls2080a-dspi" (optionally followed by "fsl,ls2085a-dspi"), + "fsl,ls2085a-dspi", + "fsl,lx2160a-dspi", - reg : Offset and length of the register set for the device - interrupts : Should contain SPI controller interrupt - clocks: from common clock binding: handle to dspi clock. @@ -14,11 +19,11 @@ Required properties: - pinctrl-0: pin control group to be used for this controller. - pinctrl-names: must contain a "default" entry. - spi-num-chipselects : the number of the chipselect signals. -- bus-num : the slave chip chipselect signal number. Optional property: - big-endian: If present the dspi device's registers are implemented in big endian mode. +- bus-num : the slave chip chipselect signal number. Optional SPI slave node properties: - fsl,spi-cs-sck-delay: a delay in nanoseconds between activating chip diff --git a/Documentation/devicetree/bindings/spi/spi-mtk-nor.txt b/Documentation/devicetree/bindings/spi/spi-mtk-nor.txt new file mode 100644 index 000000000000..984ae7fd4f94 --- /dev/null +++ b/Documentation/devicetree/bindings/spi/spi-mtk-nor.txt @@ -0,0 +1,47 @@ +* Serial NOR flash controller for MediaTek ARM SoCs + +Required properties: +- compatible: For mt8173, compatible should be "mediatek,mt8173-nor", + and it's the fallback compatible for other Soc. + For every other SoC, should contain both the SoC-specific compatible + string and "mediatek,mt8173-nor". + The possible values are: + "mediatek,mt2701-nor", "mediatek,mt8173-nor" + "mediatek,mt2712-nor", "mediatek,mt8173-nor" + "mediatek,mt7622-nor", "mediatek,mt8173-nor" + "mediatek,mt7623-nor", "mediatek,mt8173-nor" + "mediatek,mt7629-nor", "mediatek,mt8173-nor" + "mediatek,mt8173-nor" +- reg: physical base address and length of the controller's register +- interrupts: Interrupt number used by the controller. +- clocks: the phandle of the clocks needed by the nor controller +- clock-names: the names of the clocks + the clocks should be named "spi" and "sf". "spi" is used for spi bus, + and "sf" is used for controller, these are the clocks witch + hardware needs to enabling nor flash and nor flash controller. + See Documentation/devicetree/bindings/clock/clock-bindings.txt for details. +- #address-cells: should be <1> +- #size-cells: should be <0> + +There should be only one spi slave device following generic spi bindings. +It's not recommended to use this controller for devices other than SPI NOR +flash due to limited transfer capability of this controller. + +Example: + +nor_flash: spi@1100d000 { + compatible = "mediatek,mt8173-nor"; + reg = <0 0x1100d000 0 0xe0>; + interrupts = <&spi_flash_irq>; + clocks = <&pericfg CLK_PERI_SPI>, + <&topckgen CLK_TOP_SPINFI_IFR_SEL>; + clock-names = "spi", "sf"; + #address-cells = <1>; + #size-cells = <0>; + + flash@0 { + compatible = "jedec,spi-nor"; + reg = <0>; + }; +}; + diff --git a/Documentation/devicetree/bindings/spi/spi-mux.yaml b/Documentation/devicetree/bindings/spi/spi-mux.yaml new file mode 100644 index 000000000000..0ae692dc28b5 --- /dev/null +++ b/Documentation/devicetree/bindings/spi/spi-mux.yaml @@ -0,0 +1,89 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/spi/spi-mux.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic SPI Multiplexer + +description: | + This binding describes a SPI bus multiplexer to route the SPI chip select + signals. This can be used when you need more devices than the SPI controller + has chip selects available. An example setup is shown in ASCII art; the actual + setting of the multiplexer to a channel needs to be done by a specific SPI mux + driver. + + MOSI /--------------------------------+--------+--------+--------\ + MISO |/------------------------------+|-------+|-------+|-------\| + SCL ||/----------------------------+||------+||------+||------\|| + ||| ||| ||| ||| ||| + +------------+ ||| ||| ||| ||| + | SoC ||| | +-+++-+ +-+++-+ +-+++-+ +-+++-+ + | ||| | | dev | | dev | | dev | | dev | + | +--+++-+ | CS-X +------+\ +--+--+ +--+--+ +--+--+ +--+--+ + | | SPI +-|-------+ Mux |\\ CS-0 | | | | + | +------+ | +--+---+\\\-------/ CS-1 | | | + | | | \\\----------------/ CS-2 | | + | +------+ | | \\-------------------------/ CS-3 | + | | ? +-|----------/ \----------------------------------/ + | +------+ | + +------------+ + +allOf: + - $ref: "/schemas/spi/spi-controller.yaml#" + +maintainers: + - Chris Packham <chris.packham@alliedtelesis.co.nz> + +properties: + compatible: + const: spi-mux + + mux-controls: + maxItems: 1 + +required: + - compatible + - reg + - spi-max-frequency + - mux-controls + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + mux: mux-controller { + compatible = "gpio-mux"; + #mux-control-cells = <0>; + + mux-gpios = <&gpio0 3 GPIO_ACTIVE_HIGH>; + }; + + spi { + #address-cells = <1>; + #size-cells = <0>; + spi@0 { + compatible = "spi-mux"; + reg = <0>; + #address-cells = <1>; + #size-cells = <0>; + spi-max-frequency = <100000000>; + + mux-controls = <&mux>; + + spi-flash@0 { + compatible = "jedec,spi-nor"; + reg = <0>; + #address-cells = <1>; + #size-cells = <0>; + spi-max-frequency = <40000000>; + }; + + spi-device@1 { + compatible = "lineartechnology,ltc2488"; + reg = <1>; + #address-cells = <1>; + #size-cells = <0>; + spi-max-frequency = <10000000>; + }; + }; + }; diff --git a/Documentation/devicetree/bindings/spi/spi-nxp-fspi.txt b/Documentation/devicetree/bindings/spi/spi-nxp-fspi.txt index 2cd67eb727d4..7ac60d9fe357 100644 --- a/Documentation/devicetree/bindings/spi/spi-nxp-fspi.txt +++ b/Documentation/devicetree/bindings/spi/spi-nxp-fspi.txt @@ -2,6 +2,9 @@ Required properties: - compatible : Should be "nxp,lx2160a-fspi" + "nxp,imx8qxp-fspi" + "nxp,imx8mm-fspi" + - reg : First contains the register location and length, Second contains the memory mapping address and length - reg-names : Should contain the resource reg names: diff --git a/Documentation/devicetree/bindings/spi/spi-rockchip.txt b/Documentation/devicetree/bindings/spi/spi-rockchip.txt deleted file mode 100644 index a0edac12d8df..000000000000 --- a/Documentation/devicetree/bindings/spi/spi-rockchip.txt +++ /dev/null @@ -1,58 +0,0 @@ -* Rockchip SPI Controller - -The Rockchip SPI controller is used to interface with various devices such as flash -and display controllers using the SPI communication interface. - -Required Properties: - -- compatible: should be one of the following. - "rockchip,rv1108-spi" for rv1108 SoCs. - "rockchip,px30-spi", "rockchip,rk3066-spi" for px30 SoCs. - "rockchip,rk3036-spi" for rk3036 SoCS. - "rockchip,rk3066-spi" for rk3066 SoCs. - "rockchip,rk3188-spi" for rk3188 SoCs. - "rockchip,rk3228-spi" for rk3228 SoCS. - "rockchip,rk3288-spi" for rk3288 SoCs. - "rockchip,rk3368-spi" for rk3368 SoCs. - "rockchip,rk3399-spi" for rk3399 SoCs. -- reg: physical base address of the controller and length of memory mapped - region. -- interrupts: The interrupt number to the cpu. The interrupt specifier format - depends on the interrupt controller. -- clocks: Must contain an entry for each entry in clock-names. -- clock-names: Shall be "spiclk" for the transfer-clock, and "apb_pclk" for - the peripheral clock. -- #address-cells: should be 1. -- #size-cells: should be 0. - -Optional Properties: - -- dmas: DMA specifiers for tx and rx dma. See the DMA client binding, - Documentation/devicetree/bindings/dma/dma.txt -- dma-names: DMA request names should include "tx" and "rx" if present. -- rx-sample-delay-ns: nanoseconds to delay after the SCLK edge before sampling - Rx data (may need to be fine tuned for high capacitance lines). - No delay (0) by default. -- pinctrl-names: Names for the pin configuration(s); may be "default" or - "sleep", where the "sleep" configuration may describe the state - the pins should be in during system suspend. See also - pinctrl/pinctrl-bindings.txt. - - -Example: - - spi0: spi@ff110000 { - compatible = "rockchip,rk3066-spi"; - reg = <0xff110000 0x1000>; - dmas = <&pdma1 11>, <&pdma1 12>; - dma-names = "tx", "rx"; - rx-sample-delay-ns = <10>; - #address-cells = <1>; - #size-cells = <0>; - interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>; - clocks = <&cru SCLK_SPI0>, <&cru PCLK_SPI0>; - clock-names = "spiclk", "apb_pclk"; - pinctrl-0 = <&spi1_pins>; - pinctrl-1 = <&spi1_sleep>; - pinctrl-names = "default", "sleep"; - }; diff --git a/Documentation/devicetree/bindings/spi/spi-rockchip.yaml b/Documentation/devicetree/bindings/spi/spi-rockchip.yaml new file mode 100644 index 000000000000..81ad4b761502 --- /dev/null +++ b/Documentation/devicetree/bindings/spi/spi-rockchip.yaml @@ -0,0 +1,107 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/spi/spi-rockchip.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Rockchip SPI Controller + +description: + The Rockchip SPI controller is used to interface with various devices such + as flash and display controllers using the SPI communication interface. + +allOf: + - $ref: "spi-controller.yaml#" + +maintainers: + - Heiko Stuebner <heiko@sntech.de> + +# Everything else is described in the common file +properties: + compatible: + oneOf: + - const: rockchip,rk3036-spi + - const: rockchip,rk3066-spi + - const: rockchip,rk3228-spi + - const: rockchip,rv1108-spi + - items: + - enum: + - rockchip,px30-spi + - rockchip,rk3188-spi + - rockchip,rk3288-spi + - rockchip,rk3308-spi + - rockchip,rk3328-spi + - rockchip,rk3368-spi + - rockchip,rk3399-spi + - const: rockchip,rk3066-spi + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + clocks: + items: + - description: transfer-clock + - description: peripheral clock + + clock-names: + items: + - const: spiclk + - const: apb_pclk + + dmas: + items: + - description: TX DMA Channel + - description: RX DMA Channel + + dma-names: + items: + - const: tx + - const: rx + + rx-sample-delay-ns: + default: 0 + description: + Nano seconds to delay after the SCLK edge before sampling Rx data + (may need to be fine tuned for high capacitance lines). + If not specified 0 will be used. + + pinctrl-names: + minItems: 1 + items: + - const: default + - const: sleep + description: + Names for the pin configuration(s); may be "default" or "sleep", + where the "sleep" configuration may describe the state + the pins should be in during system suspend. + +required: + - compatible + - reg + - interrupts + - clocks + - clock-names + +examples: + - | + #include <dt-bindings/clock/rk3188-cru-common.h> + #include <dt-bindings/interrupt-controller/arm-gic.h> + #include <dt-bindings/interrupt-controller/irq.h> + spi0: spi@ff110000 { + compatible = "rockchip,rk3066-spi"; + reg = <0xff110000 0x1000>; + interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&cru SCLK_SPI0>, <&cru PCLK_SPI0>; + clock-names = "spiclk", "apb_pclk"; + dmas = <&pdma1 11>, <&pdma1 12>; + dma-names = "tx", "rx"; + pinctrl-0 = <&spi1_pins>; + pinctrl-1 = <&spi1_sleep>; + pinctrl-names = "default", "sleep"; + rx-sample-delay-ns = <10>; + #address-cells = <1>; + #size-cells = <0>; + }; diff --git a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml index f0d979664f07..e49ecbf715ba 100644 --- a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml +++ b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml @@ -49,7 +49,7 @@ properties: dmas: description: | DMA specifiers for tx and rx dma. DMA fifo mode must be used. See - the STM32 DMA bindings Documentation/devicetree/bindings/dma/stm32-dma.txt. + the STM32 DMA bindings Documentation/devicetree/bindings/dma/st,stm32-dma.yaml. items: - description: rx DMA channel - description: tx DMA channel |