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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2021 YADRO
*
* Authors:
* Nikita Shubin <n.shubin@yadro.com>
*
* derivate: lib/utils/gpio/fdt_gpio.c
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <libfdt.h>
#include <sbi/sbi_error.h>
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/i2c/fdt_i2c.h>
#include <sbi/sbi_console.h>
static struct fdt_i2c_adapter *i2c_adapter_drivers[] = {
};
static int fdt_i2c_adapter_init(void *fdt, int nodeoff)
{
int pos, rc;
struct fdt_i2c_adapter *drv;
const struct fdt_match *match;
/* Try all I2C drivers one-by-one */
for (pos = 0; pos < array_size(i2c_adapter_drivers); pos++) {
drv = i2c_adapter_drivers[pos];
match = fdt_match_node(fdt, nodeoff, drv->match_table);
if (match && drv->init) {
rc = drv->init(fdt, nodeoff, match);
if (rc == SBI_ENODEV)
continue;
if (rc)
return rc;
return 0;
}
}
return SBI_ENOSYS;
}
static int fdt_i2c_adapter_find(void *fdt, int nodeoff,
struct i2c_adapter **out_adapter)
{
int rc;
struct i2c_adapter *adapter = i2c_adapter_find(nodeoff);
if (!adapter) {
/* I2C adapter not found so initialize matching driver */
rc = fdt_i2c_adapter_init(fdt, nodeoff);
if (rc)
return rc;
/* Try to find I2C adapter again */
adapter = i2c_adapter_find(nodeoff);
if (!adapter)
return SBI_ENOSYS;
}
if (out_adapter)
*out_adapter = adapter;
return 0;
}
int fdt_i2c_adapter_get(void *fdt, int nodeoff,
struct i2c_adapter **out_adapter)
{
int rc;
struct i2c_adapter *adapter;
if (!fdt || (nodeoff < 0) || !out_adapter)
return SBI_EINVAL;
rc = fdt_i2c_adapter_find(fdt, nodeoff, &adapter);
if (rc)
return rc;
*out_adapter = adapter;
return 0;
}
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