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i2c: refactor parsing of timings

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When I wanted to print the chosen values to debug output, I concluded
that a helper function to parse one timing would be helpful.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2020-04-01 21:30:18 +02:00 committed by Wolfram Sang
parent f27237c174
commit def00b32f0
1 changed files with 30 additions and 39 deletions
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69
drivers/i2c/i2c-core-base.c
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@ -1588,6 +1588,18 @@ void i2c_del_adapter(struct i2c_adapter *adap)
}
EXPORT_SYMBOL(i2c_del_adapter);
static void i2c_parse_timing(struct device *dev, char *prop_name, u32 *cur_val_p,
u32 def_val, bool use_def)
{
int ret;
ret = device_property_read_u32(dev, prop_name, cur_val_p);
if (ret && use_def)
*cur_val_p = def_val;
dev_dbg(dev, "%s: %u\n", prop_name, *cur_val_p);
}
/**
* i2c_parse_fw_timings - get I2C related timing parameters from firmware
* @dev: The device to scan for I2C timing properties
@ -1606,49 +1618,28 @@ EXPORT_SYMBOL(i2c_del_adapter);
*/
void i2c_parse_fw_timings(struct device *dev, struct i2c_timings *t, bool use_defaults)
{
int ret;
bool u = use_defaults;
u32 d;
ret = device_property_read_u32(dev, "clock-frequency", &t->bus_freq_hz);
if (ret && use_defaults)
t->bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ;
i2c_parse_timing(dev, "clock-frequency", &t->bus_freq_hz,
I2C_MAX_STANDARD_MODE_FREQ, u);
ret = device_property_read_u32(dev, "i2c-scl-rising-time-ns", &t->scl_rise_ns);
if (ret && use_defaults) {
if (t->bus_freq_hz <= I2C_MAX_STANDARD_MODE_FREQ)
t->scl_rise_ns = 1000;
else if (t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ)
t->scl_rise_ns = 300;
else
t->scl_rise_ns = 120;
}
d = t->bus_freq_hz <= I2C_MAX_STANDARD_MODE_FREQ ? 1000 :
t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ ? 300 : 120;
i2c_parse_timing(dev, "i2c-scl-rising-time-ns", &t->scl_rise_ns, d, u);
ret = device_property_read_u32(dev, "i2c-scl-falling-time-ns", &t->scl_fall_ns);
if (ret && use_defaults) {
if (t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ)
t->scl_fall_ns = 300;
else
t->scl_fall_ns = 120;
}
d = t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ ? 300 : 120;
i2c_parse_timing(dev, "i2c-scl-falling-time-ns", &t->scl_fall_ns, d, u);
ret = device_property_read_u32(dev, "i2c-scl-internal-delay-ns", &t->scl_int_delay_ns);
if (ret && use_defaults)
t->scl_int_delay_ns = 0;
ret = device_property_read_u32(dev, "i2c-sda-falling-time-ns", &t->sda_fall_ns);
if (ret && use_defaults)
t->sda_fall_ns = t->scl_fall_ns;
ret = device_property_read_u32(dev, "i2c-sda-hold-time-ns", &t->sda_hold_ns);
if (ret && use_defaults)
t->sda_hold_ns = 0;
ret = device_property_read_u32(dev, "i2c-digital-filter-width-ns", &t->digital_filter_width_ns);
if (ret && use_defaults)
t->digital_filter_width_ns = 0;
ret = device_property_read_u32(dev, "i2c-analog-filter-cutoff-frequency", &t->analog_filter_cutoff_freq_hz);
if (ret && use_defaults)
t->analog_filter_cutoff_freq_hz = 0;
i2c_parse_timing(dev, "i2c-scl-internal-delay-ns",
&t->scl_int_delay_ns, 0, u);
i2c_parse_timing(dev, "i2c-sda-falling-time-ns", &t->sda_fall_ns,
t->scl_fall_ns, u);
i2c_parse_timing(dev, "i2c-sda-hold-time-ns", &t->sda_hold_ns, 0, u);
i2c_parse_timing(dev, "i2c-digital-filter-width-ns",
&t->digital_filter_width_ns, 0, u);
i2c_parse_timing(dev, "i2c-analog-filter-cutoff-frequency",
&t->analog_filter_cutoff_freq_hz, 0, u);
}
EXPORT_SYMBOL_GPL(i2c_parse_fw_timings);