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@xxxxxxxxxxxxxxxxxxxx> --- I am not entirely happy because 'dev' and 'u' is the same for each call. Then again, we can't use a for-loop over an array of parameters, because some default values depend on previously obtained timings. Looking for opinions here... drivers/i2c/i2c-core-base.c | 78 ++++++++++++++++++------------------- 1 file changed, 38 insertions(+), 40 deletions(-) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 474baaf8c9e7..60b0aa246af2 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -1609,6 +1609,18 @@ 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 @@ -1627,49 +1639,35 @@ EXPORT_SYMBOL(i2c_del_adapter); */ void i2c_parse_fw_timings(struct device *dev, struct i2c_timings *t, bool use_defaults) { - int ret; - - 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; - - 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; - } - - 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; - } + bool u = use_defaults; + u32 d; - 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; + i2c_parse_timing(dev, "clock-frequency", &t->bus_freq_hz, + I2C_MAX_STANDARD_MODE_FREQ, u); - 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; + if (t->bus_freq_hz <= I2C_MAX_STANDARD_MODE_FREQ) + d = 1000; + else if (t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ) + d = 300; + else + d = 120; + i2c_parse_timing(dev, "i2c-scl-rising-time-ns", &t->scl_rise_ns, d, u); - 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; + if (t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ) + d = 300; + else + d = 120; + i2c_parse_timing(dev, "i2c-scl-falling-time-ns", &t->scl_fall_ns, d, u); + + 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); -- 2.20.1