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From:   <Eugen.Hristev@microchip.com>
To:     <wsa@the-dreams.de>, <peda@axentia.se>, <mark.rutland@arm.com>,
        <Ludovic.Desroches@microchip.com>, <linux-i2c@vger.kernel.org>,
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        <robh+dt@kernel.org>
CC:     <Eugen.Hristev@microchip.com>, <Nicolas.Ferre@microchip.com>
Subject: [PATCH v5 3/9] i2c: add support for filters optional properties
Thread-Topic: [PATCH v5 3/9] i2c: add support for filters optional properties
Thread-Index: AQHVaHpQ2X5g0ID8eka9rBrVOgWzqQ==
Date:   Wed, 11 Sep 2019 08:24:22 +0000
Message-ID: <1568189911-31641-4-git-send-email-eugen.hristev@microchip.com>
References: <1568189911-31641-1-git-send-email-eugen.hristev@microchip.com>
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From: Eugen Hristev <eugen.hristev@microchip.com>

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 ar=
e
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 fil=
ter
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>
---
 drivers/i2c/i2c-core-base.c | 6 ++++++
 include/linux/i2c.h         | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 9c440fa..c9fcb16 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1658,6 +1658,12 @@ void i2c_parse_fw_timings(struct device *dev, struct=
 i2c_timings *t, bool use_de
 		t->sda_fall_ns =3D t->scl_fall_ns;
=20
 	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);
=20
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index fa5552c..26ce143 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -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 spec=
ification
  * @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 I=
P 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;
 };
=20
 /**
--=20
2.7.4