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authorEugen Hristev <eugen.hristev@microchip.com>2019-10-23 15:40:14 +0300
committerWolfram Sang <wsa@the-dreams.de>2019-10-24 21:23:48 +0300
commitb84dfe1af54053e0aedb14cd26307859aa1df35f (patch)
treecdbdd867df919878d216efa1155e3f130f461fd2 /drivers/i2c
parentb644257f0ec210a668f6cb24b675cb010a4ab542 (diff)
downloadlinux-b84dfe1af54053e0aedb14cd26307859aa1df35f.tar.xz
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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/i2c-core-base.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 5f6a4985f2bc..6a5183cffdfc 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -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);