266 lines
7.1 KiB
C
266 lines
7.1 KiB
C
/**
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* @file
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* @brief SPI Devicetree macro public API header file.
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*/
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/*
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* Copyright (c) 2020 Nordic Semiconductor
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_DEVICETREE_SPI_H_
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#define ZEPHYR_INCLUDE_DEVICETREE_SPI_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @defgroup devicetree-spi Devicetree SPI API
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* @ingroup devicetree
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* @{
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*/
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/**
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* @brief Does a SPI controller node have chip select GPIOs configured?
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*
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* SPI bus controllers use the "cs-gpios" property for configuring
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* chip select GPIOs. Its value is a phandle-array which specifies the
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* chip select lines.
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*
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* Example devicetree fragment:
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*
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* spi1: spi@... {
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* compatible = "vnd,spi";
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* cs-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>,
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* <&gpio2 20 GPIO_ACTIVE_LOW>;
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* };
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*
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* spi2: spi@... {
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* compatible = "vnd,spi";
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* };
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*
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* Example usage:
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*
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* DT_SPI_HAS_CS_GPIOS(DT_NODELABEL(spi1)) // 1
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* DT_SPI_HAS_CS_GPIOS(DT_NODELABEL(spi2)) // 0
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*
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* @param spi a SPI bus controller node identifier
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* @return 1 if "spi" has a cs-gpios property, 0 otherwise
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*/
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#define DT_SPI_HAS_CS_GPIOS(spi) DT_NODE_HAS_PROP(spi, cs_gpios)
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/**
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* @brief Number of chip select GPIOs in a SPI controller's cs-gpios property
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*
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* Example devicetree fragment:
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*
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* spi1: spi@... {
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* compatible = "vnd,spi";
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* cs-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>,
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* <&gpio2 20 GPIO_ACTIVE_LOW>;
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* };
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*
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* spi2: spi@... {
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* compatible = "vnd,spi";
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* };
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*
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* Example usage:
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*
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* DT_SPI_NUM_CS_GPIOS(DT_NODELABEL(spi1)) // 2
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* DT_SPI_NUM_CS_GPIOS(DT_NODELABEL(spi2)) // 0
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*
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* @param spi a SPI bus controller node identifier
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* @return Logical length of spi's cs-gpios property, or 0 if "spi" doesn't
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* have a cs-gpios property
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*/
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#define DT_SPI_NUM_CS_GPIOS(spi) \
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COND_CODE_1(DT_SPI_HAS_CS_GPIOS(spi), \
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(DT_PROP_LEN(spi, cs_gpios)), (0))
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/**
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* @brief Does a SPI device have a chip select line configured?
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* Example devicetree fragment:
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*
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* spi1: spi@... {
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* compatible = "vnd,spi";
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* cs-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>,
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* <&gpio2 20 GPIO_ACTIVE_LOW>;
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*
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* a: spi-dev-a@0 {
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* reg = <0>;
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* };
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*
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* b: spi-dev-b@1 {
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* reg = <1>;
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* };
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* };
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*
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* spi2: spi@... {
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* compatible = "vnd,spi";
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* c: spi-dev-c@0 {
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* reg = <0>;
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* };
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* };
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*
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* Example usage:
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*
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* DT_SPI_DEV_HAS_CS_GPIOS(DT_NODELABEL(a)) // 1
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* DT_SPI_DEV_HAS_CS_GPIOS(DT_NODELABEL(b)) // 1
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* DT_SPI_DEV_HAS_CS_GPIOS(DT_NODELABEL(c)) // 0
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*
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* @param spi_dev a SPI device node identifier
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* @return 1 if spi_dev's bus node DT_BUS(spi_dev) has a chip select
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* pin at index DT_REG_ADDR(spi_dev), 0 otherwise
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*/
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#define DT_SPI_DEV_HAS_CS_GPIOS(spi_dev) DT_SPI_HAS_CS_GPIOS(DT_BUS(spi_dev))
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/**
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* @brief Get a SPI device's chip select GPIO controller's label property
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*
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* Example devicetree fragment:
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*
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* gpio1: gpio@... {
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* label = "GPIO_1";
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* };
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*
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* gpio2: gpio@... {
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* label = "GPIO_2";
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* };
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*
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* spi1: spi@... {
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* compatible = "vnd,spi";
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* cs-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>,
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* <&gpio2 20 GPIO_ACTIVE_LOW>;
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*
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* a: spi-dev-a@0 {
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* reg = <0>;
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* };
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*
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* b: spi-dev-b@1 {
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* reg = <1>;
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* };
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* };
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*
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* Example usage:
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*
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* DT_SPI_DEV_CS_GPIOS_LABEL(DT_NODELABEL(a)) // "GPIO_1"
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* DT_SPI_DEV_CS_GPIOS_LABEL(DT_NODELABEL(b)) // "GPIO_2"
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*
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* @param spi_dev a SPI device node identifier
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* @return label property of spi_dev's chip select GPIO controller
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*/
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#define DT_SPI_DEV_CS_GPIOS_LABEL(spi_dev) \
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DT_GPIO_LABEL_BY_IDX(DT_BUS(spi_dev), cs_gpios, DT_REG_ADDR(spi_dev))
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/**
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* @brief Get a SPI device's chip select GPIO pin number
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*
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* It's an error if the GPIO specifier for spi_dev's entry in its
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* bus node's cs-gpios property has no pin cell.
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*
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* Example devicetree fragment:
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*
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* spi1: spi@... {
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* compatible = "vnd,spi";
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* cs-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>,
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* <&gpio2 20 GPIO_ACTIVE_LOW>;
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*
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* a: spi-dev-a@0 {
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* reg = <0>;
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* };
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*
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* b: spi-dev-b@1 {
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* reg = <1>;
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* };
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* };
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*
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* Example usage:
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*
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* DT_SPI_DEV_CS_GPIOS_PIN(DT_NODELABEL(a)) // 10
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* DT_SPI_DEV_CS_GPIOS_PIN(DT_NODELABEL(b)) // 20
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*
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* @param spi_dev a SPI device node identifier
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* @return pin number of spi_dev's chip select GPIO
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*/
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#define DT_SPI_DEV_CS_GPIOS_PIN(spi_dev) \
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DT_GPIO_PIN_BY_IDX(DT_BUS(spi_dev), cs_gpios, DT_REG_ADDR(spi_dev))
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/**
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* @brief Get a SPI device's chip select GPIO flags
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*
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* Example devicetree fragment:
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*
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* spi1: spi@... {
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* compatible = "vnd,spi";
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* cs-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>;
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*
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* a: spi-dev-a@0 {
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* reg = <0>;
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* };
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* };
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*
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* Example usage:
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*
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* DT_SPI_DEV_CS_GPIOS_FLAGS(DT_NODELABEL(a)) // GPIO_ACTIVE_LOW
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*
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* If the GPIO specifier for spi_dev's entry in its bus node's
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* cs-gpios property has no flags cell, this expands to zero.
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*
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* @param spi_dev a SPI device node identifier
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* @return flags value of spi_dev's chip select GPIO specifier, or
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* zero if there is none
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*/
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#define DT_SPI_DEV_CS_GPIOS_FLAGS(spi_dev) \
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DT_GPIO_FLAGS_BY_IDX(DT_BUS(spi_dev), cs_gpios, DT_REG_ADDR(spi_dev))
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/**
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* @brief Equivalent to DT_SPI_DEV_HAS_CS_GPIOS(DT_DRV_INST(inst)).
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* @param inst DT_DRV_COMPAT instance number
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* @return 1 if the instance's bus has a CS pin at index
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* DT_INST_REG_ADDR(inst), 0 otherwise
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* @see DT_SPI_DEV_HAS_CS_GPIOS()
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*/
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#define DT_INST_SPI_DEV_HAS_CS_GPIOS(inst) \
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DT_SPI_DEV_HAS_CS_GPIOS(DT_DRV_INST(inst))
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/**
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* @brief Get GPIO controller name for a SPI device instance
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* This is equivalent to DT_SPI_DEV_CS_GPIOS_LABEL(DT_DRV_INST(inst)).
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* @param inst DT_DRV_COMPAT instance number
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* @return label property of the instance's chip select GPIO controller
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* @see DT_SPI_DEV_CS_GPIOS_LABEL()
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*/
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#define DT_INST_SPI_DEV_CS_GPIOS_LABEL(inst) \
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DT_SPI_DEV_CS_GPIOS_LABEL(DT_DRV_INST(inst))
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/**
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* @brief Equivalent to DT_SPI_DEV_CS_GPIOS_PIN(DT_DRV_INST(inst)).
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* @param inst DT_DRV_COMPAT instance number
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* @return pin number of the instance's chip select GPIO
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* @see DT_SPI_DEV_CS_GPIOS_PIN()
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*/
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#define DT_INST_SPI_DEV_CS_GPIOS_PIN(inst) \
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DT_SPI_DEV_CS_GPIOS_PIN(DT_DRV_INST(inst))
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/**
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* @brief DT_SPI_DEV_CS_GPIOS_FLAGS(DT_DRV_INST(inst)).
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* @param inst DT_DRV_COMPAT instance number
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* @return flags value of the instance's chip select GPIO specifier,
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* or zero if there is none
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* @see DT_SPI_DEV_CS_GPIOS_FLAGS()
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*/
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#define DT_INST_SPI_DEV_CS_GPIOS_FLAGS(inst) \
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DT_SPI_DEV_CS_GPIOS_FLAGS(DT_DRV_INST(inst))
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* ZEPHYR_INCLUDE_DEVICETREE_SPI_H_ */
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