51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
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/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2022-12-06 GuEe-GUI first version
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*/
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#include <rtdevice.h>
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#define DBG_TAG "i2c.dm"
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#define DBG_LVL DBG_INFO
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#include <rtdbg.h>
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#ifdef RT_USING_OFW
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static void i2c_parse_timing(struct rt_ofw_node *dev_np, const char *propname,
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rt_uint32_t *out_value, rt_uint32_t def_value, rt_bool_t use_defaults)
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{
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if (rt_ofw_prop_read_u32(dev_np, propname, out_value) && use_defaults)
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{
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*out_value = def_value;
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}
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}
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rt_err_t i2c_timings_ofw_parse(struct rt_ofw_node *dev_np, struct i2c_timings *timings,
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rt_bool_t use_defaults)
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{
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rt_ubase_t def;
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rt_bool_t udef = use_defaults;
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struct i2c_timings *t = timings;
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i2c_parse_timing(dev_np, "clock-frequency", &t->bus_freq_hz, I2C_MAX_STANDARD_MODE_FREQ, udef);
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def = t->bus_freq_hz <= I2C_MAX_STANDARD_MODE_FREQ ? 1000 : t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ ? 300 : 120;
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i2c_parse_timing(dev_np, "i2c-scl-rising-time-ns", &t->scl_rise_ns, def, udef);
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def = t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ ? 300 : 120;
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i2c_parse_timing(dev_np, "i2c-scl-falling-time-ns", &t->scl_fall_ns, def, udef);
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i2c_parse_timing(dev_np, "i2c-scl-internal-delay-ns", &t->scl_int_delay_ns, 0, udef);
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i2c_parse_timing(dev_np, "i2c-sda-falling-time-ns", &t->sda_fall_ns, t->scl_fall_ns, udef);
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i2c_parse_timing(dev_np, "i2c-sda-hold-time-ns", &t->sda_hold_ns, 0, udef);
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i2c_parse_timing(dev_np, "i2c-digital-filter-width-ns", &t->digital_filter_width_ns, 0, udef);
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i2c_parse_timing(dev_np, "i2c-analog-filter-cutoff-frequency", &t->analog_filter_cutoff_freq_hz, 0, udef);
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return RT_EOK;
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}
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#endif /* RT_USING_OFW */
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