7e0eed9235
Usually, we want to operate only on "available" device
nodes ("available" means "status is okay and a matching binding is
found"), but that's not true in all cases.
Sometimes we want to operate on special nodes without matching
bindings, such as those describing memory.
To handle the distinction, change various additional devicetree APIs
making it clear that they operate only on available device nodes,
adjusting gen_defines and devicetree.h implementation details
accordingly:
- emit macros for all existing nodes in gen_defines.py, regardless
of status or matching binding
- rename DT_NUM_INST to DT_NUM_INST_STATUS_OKAY
- rename DT_NODE_HAS_COMPAT to DT_NODE_HAS_COMPAT_STATUS_OKAY
- rename DT_INST_FOREACH to DT_INST_FOREACH_STATUS_OKAY
- rename DT_ANY_INST_ON_BUS to DT_ANY_INST_ON_BUS_STATUS_OKAY
- rewrite DT_HAS_NODE_STATUS_OKAY in terms of a new DT_NODE_HAS_STATUS
- resurrect DT_HAS_NODE in the form of DT_NODE_EXISTS
- remove DT_COMPAT_ON_BUS as a public API
- use the new default_prop_types edtlib parameter
Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/*
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* Copyright (c) 2017 Linaro Ltd.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT arm_versatile_i2c
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/**
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* @file
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* @brief Driver for ARM's SBCon 2-wire serial bus interface
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*
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* SBCon is a simple device which allows directly setting and getting the
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* hardware state of two-bit serial interfaces like I2C.
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*/
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#include <device.h>
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#include <errno.h>
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#include <drivers/i2c.h>
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#include "i2c_bitbang.h"
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/* SBCon hardware registers layout */
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struct sbcon {
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union {
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volatile u32_t SB_CONTROLS; /* Write to set pins high */
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volatile u32_t SB_CONTROL; /* Read for state of pins */
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};
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volatile u32_t SB_CONTROLC; /* Write to set pins low */
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};
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/* Bits values for SCL and SDA lines in struct sbcon registers */
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#define SCL BIT(0)
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#define SDA BIT(1)
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/* Driver config */
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struct i2c_sbcon_config {
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struct sbcon *sbcon; /* Address of hardware registers */
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};
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/* Driver instance data */
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struct i2c_sbcon_context {
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struct i2c_bitbang bitbang; /* Bit-bang library data */
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};
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static void i2c_sbcon_set_scl(void *io_context, int state)
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{
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struct sbcon *sbcon = io_context;
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if (state) {
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sbcon->SB_CONTROLS = SCL;
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} else {
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sbcon->SB_CONTROLC = SCL;
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}
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}
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static void i2c_sbcon_set_sda(void *io_context, int state)
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{
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struct sbcon *sbcon = io_context;
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if (state) {
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sbcon->SB_CONTROLS = SDA;
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} else {
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sbcon->SB_CONTROLC = SDA;
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}
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}
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static int i2c_sbcon_get_sda(void *io_context)
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{
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struct sbcon *sbcon = io_context;
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return sbcon->SB_CONTROL & SDA;
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}
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static const struct i2c_bitbang_io io_fns = {
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.set_scl = &i2c_sbcon_set_scl,
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.set_sda = &i2c_sbcon_set_sda,
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.get_sda = &i2c_sbcon_get_sda,
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};
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static int i2c_sbcon_configure(struct device *dev, u32_t dev_config)
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{
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struct i2c_sbcon_context *context = dev->driver_data;
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return i2c_bitbang_configure(&context->bitbang, dev_config);
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}
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static int i2c_sbcon_transfer(struct device *dev, struct i2c_msg *msgs,
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u8_t num_msgs, u16_t slave_address)
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{
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struct i2c_sbcon_context *context = dev->driver_data;
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return i2c_bitbang_transfer(&context->bitbang, msgs, num_msgs,
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slave_address);
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}
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static struct i2c_driver_api api = {
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.configure = i2c_sbcon_configure,
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.transfer = i2c_sbcon_transfer,
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};
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static int i2c_sbcon_init(struct device *dev)
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{
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struct i2c_sbcon_context *context = dev->driver_data;
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const struct i2c_sbcon_config *config = dev->config_info;
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i2c_bitbang_init(&context->bitbang, &io_fns, config->sbcon);
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return 0;
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}
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#define DEFINE_I2C_SBCON(_num) \
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\
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static struct i2c_sbcon_context i2c_sbcon_dev_data_##_num; \
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\
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static const struct i2c_sbcon_config i2c_sbcon_dev_cfg_##_num = { \
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.sbcon = (void *)DT_INST_REG_ADDR(_num), \
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}; \
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\
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DEVICE_AND_API_INIT(i2c_sbcon_##_num, DT_INST_LABEL(_num), \
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i2c_sbcon_init, \
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&i2c_sbcon_dev_data_##_num, \
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&i2c_sbcon_dev_cfg_##_num, \
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PRE_KERNEL_2, CONFIG_I2C_INIT_PRIORITY, &api);
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DT_INST_FOREACH_STATUS_OKAY(DEFINE_I2C_SBCON)
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