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i2c: add support for filters optional properties 

i2c-digital-filter-width-ns:
This optional timing property specifies the width of the spikes on the i2c
lines (in ns) that can be filtered out by built-in digital filters which are
embedded in some i2c controllers.
i2c-analog-filter-cutoff-frequency:
This optional timing property specifies the cutoff frequency of a low-pass
analog filter built-in i2c controllers. This low pass filter is used to filter
out high frequency noise on the i2c lines. Specified in Hz.
Include these properties in the timings structure and read them as integers.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Reviewed-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Eugen Hristev 2019-10-23 12:40:14 +00:00 committed by Wolfram Sang
parent b644257f0e
commit b84dfe1af5
2 changed files with 12 additions and 0 deletions
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6
drivers/i2c/i2c-core-base.c
View File

@ -1656,6 +1656,12 @@ void i2c_parse_fw_timings(struct device *dev, struct i2c_timings *t, bool use_de
t->sda_fall_ns = t->scl_fall_ns;
device_property_read_u32(dev, "i2c-sda-hold-time-ns", &t->sda_hold_ns);
device_property_read_u32(dev, "i2c-digital-filter-width-ns",
&t->digital_filter_width_ns);
device_property_read_u32(dev, "i2c-analog-filter-cutoff-frequency",
&t->analog_filter_cutoff_freq_hz);
}
EXPORT_SYMBOL_GPL(i2c_parse_fw_timings);

6
include/linux/i2c.h
View File

@ -575,6 +575,10 @@ struct i2c_lock_operations {
* @scl_int_delay_ns: time IP core additionally needs to setup SCL in ns
* @sda_fall_ns: time SDA signal takes to fall in ns; t(f) in the I2C specification
* @sda_hold_ns: time IP core additionally needs to hold SDA in ns
* @digital_filter_width_ns: width in ns of spikes on i2c lines that the IP core
* digital filter can filter out
* @analog_filter_cutoff_freq_hz: threshold frequency for the low pass IP core
* analog filter
*/
struct i2c_timings {
u32 bus_freq_hz;
@ -583,6 +587,8 @@ struct i2c_timings {
u32 scl_int_delay_ns;
u32 sda_fall_ns;
u32 sda_hold_ns;
u32 digital_filter_width_ns;
u32 analog_filter_cutoff_freq_hz;
};
/**