forked from Mirrors/opensbi
333133edaa
The i2c driver subsystem does not need any extra data, so it can use `struct fdt_driver` directly. It always initializes the driver for a specific DT node. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org>
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 YADRO
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*
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* Authors:
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* Nikita Shubin <n.shubin@yadro.com>
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*
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* derivate: lib/utils/gpio/fdt_gpio.c
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <sbi/sbi_error.h>
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#include <sbi_utils/i2c/fdt_i2c.h>
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/* List of FDT i2c adapter drivers generated at compile time */
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extern const struct fdt_driver *const fdt_i2c_adapter_drivers[];
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static int fdt_i2c_adapter_find(const void *fdt, int nodeoff,
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struct i2c_adapter **out_adapter)
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{
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int rc;
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struct i2c_adapter *adapter = i2c_adapter_find(nodeoff);
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if (!adapter) {
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/* I2C adapter not found so initialize matching driver */
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rc = fdt_driver_init_by_offset(fdt, nodeoff,
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fdt_i2c_adapter_drivers);
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if (rc)
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return rc;
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/* Try to find I2C adapter again */
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adapter = i2c_adapter_find(nodeoff);
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if (!adapter)
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return SBI_ENOSYS;
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}
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if (out_adapter)
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*out_adapter = adapter;
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return 0;
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}
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int fdt_i2c_adapter_get(const void *fdt, int nodeoff,
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struct i2c_adapter **out_adapter)
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{
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int rc;
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struct i2c_adapter *adapter;
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if (!fdt || (nodeoff < 0) || !out_adapter)
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return SBI_EINVAL;
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rc = fdt_i2c_adapter_find(fdt, nodeoff, &adapter);
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if (rc)
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return rc;
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*out_adapter = adapter;
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return 0;
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}
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