[v4,3/9] i2c: add support for filter-width-ns optional property
diff mbox series

Message ID 1567418773-2427-4-git-send-email-eugen.hristev@microchip.com
State Superseded
Headers show
  • i2c: add support for filters
Related show

Commit Message

Eugen Hristev Sept. 2, 2019, 10:12 a.m. UTC
From: Eugen Hristev <eugen.hristev@microchip.com>

This optional timing property specifies the width of the spikes on the i2c
lines (in ns) that can be filtered out by built-in analog or digital filters
which are embedded in some i2c controllers.
Include it in the timings structure and read it as integer property.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
 drivers/i2c/i2c-core-base.c | 2 ++
 include/linux/i2c.h         | 2 ++
 2 files changed, 4 insertions(+)

diff mbox series

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index f26ed49..804197e 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1658,6 +1658,8 @@  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-filter-width-ns", &t->filter_width_ns);
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index fa5552c..b1e9c39 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -575,6 +575,7 @@  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
+ * @filter_width_ns: width in ns of spikes on i2c lines that the IP core can filter out
 struct i2c_timings {
 	u32 bus_freq_hz;
@@ -583,6 +584,7 @@  struct i2c_timings {
 	u32 scl_int_delay_ns;
 	u32 sda_fall_ns;
 	u32 sda_hold_ns;
+	u32 filter_width_ns;