linux/Documentation/devicetree
Rasmus Villemoes ab1e9de84a dt-bindings: dp83867: add binding for io_impedance_ctrl nvmem cell
We have a board where measurements indicate that the current three
options - leaving IO_IMPEDANCE_CTRL at the reset value (which is
factory calibrated to a value corresponding to approximately 50 ohms)
or using one of the two boolean properties to set it to the min/max
value - are too coarse.

There is no fixed mapping from register values to values in the range
35-70 ohms; it varies from chip to chip, and even that target range is
approximate. So add a DT binding for an nvmem cell which can be
populated during production with a value suitable for each specific
board.

Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-06-16 20:28:53 -07:00
..
bindings dt-bindings: dp83867: add binding for io_impedance_ctrl nvmem cell 2022-06-16 20:28:53 -07:00
changesets.rst
dynamic-resolution-notes.rst
index.rst
kernel-api.rst
of_unittest.rst of: unittest: add program to process EXPECT messages 2022-02-28 15:20:32 -06:00
overlay-notes.rst of: overlay: rework overlay apply and remove kfree()s 2022-04-25 10:56:11 -05:00
usage-model.rst