mirror of
https://github.com/zephyrproject-rtos/zephyr
synced 2025-08-12 05:09:49 +00:00
be217e4a3a
In npcx7 series, all of them support the Intel Enhanced Serial Peripheral Interface (eSPI) Revision 1.0. This specification provides a path for migrating host sub-devices via LPC to a lower pin count, higher bandwidth bus. In addition to Host communication via the peripheral channel, it provides virtual wires support, out-of-band communication, and device mastering option over the Chipset SPI flash. Becisdes introducing eSPI device in npcx7, this CL also includes: 1. Add eSPI device tree declarations. 2. Add npcx7-espi-vws-map.dtsi to present the relationship between eSPI Virtual-Wire signals, eSPI registers, and wake-up input sources. 3. Zephyr eSPI api implementation. 4, Add OOB (Out of Band tunneled SMBus) support. 5. Add configuration files for eSPI test suites. Signed-off-by: Mulin Chao <MLChao@nuvoton.com> |
||
|---|---|---|
| .. | ||
| boards | ||
| dts/bindings | ||
| src | ||
| CMakeLists.txt | ||
| Kconfig | ||
| prj_mec1501modular_assy6885.conf | ||
| prj_npcx7m6fb_evb.conf | ||
| prj.conf | ||
| README.rst | ||
| sample.yaml | ||
.. _espi-sample:
Enhanced Serial Peripheral Interface
####################################
Overview
********
This sample demonstrates how to use the Enhanced Serial Peripheral Interface
(eSPI) API.
It shows how to configure and select eSPI controller capabilities as part of
a simple eSPI handshake that includes exchanging virtual wire packets.
Standard platform signals are sent virtual wire packets over the bus.
Callbacks are registered that will write to the console indicating main
eSPI events and when a virtual wire is received.
Building and Running
********************
The sample can be built and executed on boards supporting eSPI.
Any pins required for minimum eSPI handshake should be configured.
Sample requires a correct harness and fixture setup.
Please connect an eSPI device to the testing board.
After that for the correct execution of that sample in sanitycheck, add into
boards's map-file next fixture settings::
- fixture: espi_device_connect
Sample output
=============
.. code-block:: console
Hello eSPI test!
eSPI test - I/O initialization...complete
eSPI slave configured successfully!
eSPI test - callbacks initialization... complete
eSPI test - callbacks registration... complete
eSPI test - Power initialization...complete
eSPI test - Handshake
eSPI BUS reset 0
VW channel is ready
PLT_RST changed 1
1st phase completed
2nd phase completed
3rd phase completed
note:: The values shown above might differ.