forked from Imagelibrary/rtems
bsps/imx*: Add an i.MX* specific GPIO SPI driver
This driver uses the generic spi-gpio driver to implement one based on the i.MX* GPIO API.
This commit is contained in:
committed by
Sebastian Huber
parent
0e7567bc2a
commit
15f16def12
88
bsps/arm/include/dev/spi/imx-spi-gpio.h
Normal file
88
bsps/arm/include/dev/spi/imx-spi-gpio.h
Normal file
@@ -0,0 +1,88 @@
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/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup RTEMSDeviceIMXSPIGPIO
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*
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* @brief This header file provides the interfaces of
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* @ref RTEMSDeviceIMXSPIGPIO.
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*/
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/*
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* Copyright (C) 2024 embedded brains GmbH & Co. KG
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _RTEMS_DEV_SPI_IMX_SPI_GPIO_H
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#define _RTEMS_DEV_SPI_IMX_SPI_GPIO_H
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#include <rtems.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/**
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* @defgroup RTEMSDeviceIMXSPIGPIO
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*
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* @ingroup RTEMSDeviceSPIGPIO
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*
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* @brief A SPI bus driver that uses the i.MX/i.MXRT GPIO pins
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*
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* @{
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*/
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/**
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* @brief Register all compatible nodes from the device tree.
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*
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* Search nodes in the device tree that are compatible to 'spi-gpio' and try to
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* register the driver for them. Expects a node that looks (for example) like
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* the following:
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*
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* ```
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* gpiospi: spi {
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* status = "okay";
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* compatible = "spi-gpio";
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* #address-cells = <0x1>;
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* #size-cells = <0x0>;
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*
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* sck-gpios = <&gpio2 27 0>;
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* miso-gpios = <&gpio2 25 0>;
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* mosi-gpios = <&gpio4 14 0>;
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* cs-gpios = <&gpio4 10 1>;
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* num-chipselects = <1>;
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*
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* rtems,path = "/dev/gpiospi";
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* };
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* ```
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*/
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rtems_status_code imx_spi_gpio_init(void);
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/** @} */
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* _RTEMS_DEV_SPI_IMX_SPI_GPIO_H */
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148
bsps/arm/shared/spi/imx-spi-gpio.c
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148
bsps/arm/shared/spi/imx-spi-gpio.c
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@@ -0,0 +1,148 @@
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/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup RTEMSDeviceIMXSPIGPIO
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*
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* @brief This file provides the implementation of @ref RTEMSDeviceIMXSPIGPIO.
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*/
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/*
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* Copyright (C) 2024 embedded brains GmbH & Co. KG
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <bsp/fatal.h>
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#include <bsp/fdt.h>
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#include <bsp/imx-gpio.h>
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#include <dev/spi/spi.h>
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#include <libfdt.h>
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#include <dev/spi/spi-gpio.h>
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#include <dev/spi/imx-spi-gpio.h>
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struct imx_spi_gpio_bus {
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spi_bus base;
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struct spi_gpio_params p;
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struct imx_gpio_pin sck;
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struct imx_gpio_pin mosi;
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struct imx_gpio_pin miso;
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struct imx_gpio_pin cs[SPI_GPIO_MAX_CS];
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};
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static void imx_spi_gpio_set(void *arg, bool level)
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{
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struct imx_gpio_pin *pin = arg;
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imx_gpio_set_output(pin, level ? 1 : 0);
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}
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static bool imx_spi_gpio_get(void *arg)
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{
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struct imx_gpio_pin *pin = arg;
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return (imx_gpio_get_input(pin) != 0);
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}
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rtems_status_code imx_spi_gpio_init(void)
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{
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const void *fdt;
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int node;
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rtems_status_code sc = RTEMS_SUCCESSFUL;
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fdt = bsp_fdt_get();
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node = -1;
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do {
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node = fdt_node_offset_by_compatible(fdt, node, "spi-gpio");
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if (node >= 0 && imxrt_fdt_node_is_enabled(fdt, node)) {
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struct imx_spi_gpio_bus *bus;
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const char *bus_path;
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const uint32_t *val;
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int num_cs;
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if (sc == RTEMS_SUCCESSFUL) {
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bus = (struct imx_spi_gpio_bus*) spi_bus_alloc_and_init(sizeof(*bus));
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if (bus == NULL) {
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sc = RTEMS_UNSATISFIED;
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}
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}
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if (sc == RTEMS_SUCCESSFUL) {
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bus_path = fdt_getprop(fdt, node, "rtems,path", NULL);
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if (bus_path == NULL) {
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sc = RTEMS_UNSATISFIED;
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}
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}
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if (sc == RTEMS_SUCCESSFUL) {
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sc = imx_gpio_init_from_fdt_property(
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&bus->sck, node, "sck-gpios", IMX_GPIO_MODE_OUTPUT, 0);
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bus->p.set_clk = imx_spi_gpio_set;
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bus->p.set_clk_arg = &bus->sck;
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}
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if (sc == RTEMS_SUCCESSFUL) {
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sc = imx_gpio_init_from_fdt_property(
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&bus->miso, node, "miso-gpios", IMX_GPIO_MODE_INPUT, 0);
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bus->p.get_miso = imx_spi_gpio_get;
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bus->p.get_miso_arg = &bus->miso;
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}
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if (sc == RTEMS_SUCCESSFUL) {
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sc = imx_gpio_init_from_fdt_property(
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&bus->mosi, node, "mosi-gpios", IMX_GPIO_MODE_OUTPUT, 0);
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bus->p.set_mosi = imx_spi_gpio_set;
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bus->p.set_mosi_arg = &bus->mosi;
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}
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if (sc == RTEMS_SUCCESSFUL) {
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val = fdt_getprop(fdt, node, "num-chipselects", NULL);
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if (val != NULL) {
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ssize_t i;
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num_cs = fdt32_to_cpu(val[0]);
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for (i = 0; i < num_cs && sc == RTEMS_SUCCESSFUL; ++i) {
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sc = imx_gpio_init_from_fdt_property(
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&bus->cs[i], node, "cs-gpios", IMX_GPIO_MODE_OUTPUT, 0);
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bus->p.set_cs[i] = imx_spi_gpio_set;
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bus->p.set_cs_arg[i] = &bus->cs[i];
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bus->p.cs_idle[i] = (imx_gpio_get_active_level(&bus->cs[i]) == 0);
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}
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}
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}
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if (sc == RTEMS_SUCCESSFUL) {
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sc = spi_gpio_init(bus_path, &bus->p);
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}
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if (sc != RTEMS_SUCCESSFUL && bus != NULL) {
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spi_bus_destroy_and_free(&bus->base);
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}
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}
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} while (node >= 0 && sc == RTEMS_SUCCESSFUL);
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return sc;
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}
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@@ -64,6 +64,10 @@ links:
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uid: ../../objirq
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- role: build-dependency
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uid: ../../objdevfsledma
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- role: build-dependency
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uid: ../objdevimxspigpio
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- role: build-dependency
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uid: ../../objdevspigpio
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- role: build-dependency
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uid: ../../objmem
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- role: build-dependency
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17
spec/build/bsps/arm/objdevimxspigpio.yml
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17
spec/build/bsps/arm/objdevimxspigpio.yml
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@@ -0,0 +1,17 @@
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SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
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build-type: objects
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cflags: []
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copyrights:
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- Copyright (C) 2024 embedded brains GmbH & Co. KG
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cppflags: []
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cxxflags: []
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enabled-by: true
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includes: []
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install:
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- destination: ${BSP_INCLUDEDIR}/dev/spi
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source:
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- bsps/arm/include/dev/spi/imx-spi-gpio.h
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links: []
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source:
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- bsps/arm/shared/spi/imx-spi-gpio.c
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type: build
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