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dt-bindings: soc: samsung: Add Exynos USI
Add USI bindings documentation and header file. Those are taken from Linux kernel [1,2], but the documentation was reworked a bit to only describe the compatibles that will be supported in U-Boot soon. [1] Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml [2] include/dt-bindings/soc/samsung,exynos-usi.h Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
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Sam Protsenko
Minkyu Kang
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2 changed files with 179 additions and 0 deletions
162
doc/device-tree-bindings/soc/samsung/exynos-usi.yaml
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doc/device-tree-bindings/soc/samsung/exynos-usi.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/soc/samsung/exynos-usi.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Samsung's Exynos USI (Universal Serial Interface)
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maintainers:
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- Sam Protsenko <semen.protsenko@linaro.org>
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description: |
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USI IP-core provides selectable serial protocol (UART, SPI or High-Speed I2C).
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USI shares almost all internal circuits within each protocol, so only one
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protocol can be chosen at a time. USI is modeled as a node with zero or more
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child nodes, each representing a serial sub-node device. The mode setting
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selects which particular function will be used.
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properties:
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$nodename:
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pattern: "^usi@[0-9a-f]+$"
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compatible:
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enum:
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- samsung,exynos850-usi
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reg: true
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clocks: true
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clock-names: true
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ranges: true
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"#address-cells":
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const: 1
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"#size-cells":
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const: 1
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samsung,sysreg:
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$ref: /schemas/types.yaml#/definitions/phandle-array
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items:
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- items:
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- description: phandle to System Register syscon node
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- description: offset of SW_CONF register for this USI controller
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description:
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Should be phandle/offset pair. The phandle to System Register syscon node
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(for the same domain where this USI controller resides) and the offset
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of SW_CONF register for this USI controller.
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samsung,mode:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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Selects USI function (which serial protocol to use). Refer to
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<include/dt-bindings/soc/samsung,exynos-usi.h> for valid USI mode values.
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samsung,clkreq-on:
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type: boolean
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description:
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Enable this property if underlying protocol requires the clock to be
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continuously provided without automatic gating. As suggested by SoC
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manual, it should be set in case of SPI/I2C slave, UART Rx and I2C
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multi-master mode. Usually this property is needed if USI mode is set
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to "UART".
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This property is optional.
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patternProperties:
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"^i2c@[0-9a-f]+$":
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$ref: /schemas/i2c/i2c-exynos5.yaml
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description: Child node describing underlying I2C
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"^serial@[0-9a-f]+$":
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$ref: /schemas/serial/samsung_uart.yaml
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description: Child node describing underlying UART/serial
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"^spi@[0-9a-f]+$":
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$ref: /schemas/spi/samsung,spi.yaml
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description: Child node describing underlying SPI
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required:
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- compatible
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- ranges
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- "#address-cells"
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- "#size-cells"
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- samsung,sysreg
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- samsung,mode
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if:
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properties:
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compatible:
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contains:
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enum:
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- samsung,exynos850-usi
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then:
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properties:
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reg:
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maxItems: 1
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clocks:
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items:
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- description: Bus (APB) clock
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- description: Operating clock for UART/SPI/I2C protocol
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clock-names:
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items:
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- const: pclk
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- const: ipclk
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required:
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- reg
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- clocks
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- clock-names
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else:
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properties:
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reg: false
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clocks: false
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clock-names: false
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samsung,clkreq-on: false
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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#include <dt-bindings/soc/samsung,exynos-usi.h>
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usi0: usi@138200c0 {
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compatible = "samsung,exynos850-usi";
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reg = <0x138200c0 0x20>;
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samsung,sysreg = <&sysreg_peri 0x1010>;
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samsung,mode = <USI_V2_UART>;
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samsung,clkreq-on; /* needed for UART mode */
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#address-cells = <1>;
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#size-cells = <1>;
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ranges;
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clocks = <&cmu_peri 32>, <&cmu_peri 31>;
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clock-names = "pclk", "ipclk";
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serial_0: serial@13820000 {
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compatible = "samsung,exynos850-uart";
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reg = <0x13820000 0xc0>;
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interrupts = <GIC_SPI 227 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&cmu_peri 32>, <&cmu_peri 31>;
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clock-names = "uart", "clk_uart_baud0";
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status = "disabled";
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};
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hsi2c_0: i2c@13820000 {
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compatible = "samsung,exynosautov9-hsi2c";
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reg = <0x13820000 0xc0>;
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interrupts = <GIC_SPI 227 IRQ_TYPE_LEVEL_HIGH>;
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#address-cells = <1>;
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#size-cells = <0>;
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clocks = <&cmu_peri 31>, <&cmu_peri 32>;
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clock-names = "hsi2c", "hsi2c_pclk";
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status = "disabled";
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};
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};
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17
include/dt-bindings/soc/samsung,exynos-usi.h
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17
include/dt-bindings/soc/samsung,exynos-usi.h
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@ -0,0 +1,17 @@
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/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
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/*
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* Copyright (c) 2021 Linaro Ltd.
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* Author: Sam Protsenko <semen.protsenko@linaro.org>
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*
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* Device Tree bindings for Samsung Exynos USI (Universal Serial Interface).
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*/
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#ifndef __DT_BINDINGS_SAMSUNG_EXYNOS_USI_H
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#define __DT_BINDINGS_SAMSUNG_EXYNOS_USI_H
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#define USI_V2_NONE 0
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#define USI_V2_UART 1
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#define USI_V2_SPI 2
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#define USI_V2_I2C 3
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#endif /* __DT_BINDINGS_SAMSUNG_EXYNOS_USI_H */
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