samples: Add smbus shell sample application

Add smbus sample for testing SMBus commands.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>

samples/drivers/smbus/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+
+if(BOARD STREQUAL qemu_x86_64)
+	LIST(APPEND QEMU_EXTRA_FLAGS -machine q35)
+endif()
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(smbus)
+
+target_sources(app PRIVATE src/main.c)

samples/drivers/smbus/README.rst

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+.. _samples_smbus_shell:
+
+SMBus Shell Sample
+##################
+
+Overview
+********
+
+This is a simple SMBus shell sample that allows arbitrary boards with SMBus
+driver supported exploring the SMBus communication with peripheral devices.
+
+Building and Running
+********************
+
+This project can be built and executed on as follows:
+
+.. zephyr-app-commands::
+   :zephyr-app: zephyr/samples/drivers/smbus
+   :host-os: unix
+   :board: qemu_x86_64
+   :goals: run
+   :compact:
+
+Sample Output
+=============
+
+Output from console when application started::
+
+   *** Booting Zephyr OS build zephyr-v3.2.0-804-gfedd72615e82  ***
+   Start SMBUS shell sample qemu_x86_64
+   uart:~$
+
+List avaibalbe SMBus shell commands with::
+
+   uart:~$ smbus
+   smbus - smbus commands
+   Subcommands:
+     quick            :SMBus Quick command
+                       Usage: quick <device> <addr>
+     scan             :Scan SMBus peripheral devices command
+                       Usage: scan <device>
+     byte_read        :SMBus: byte read command
+                       Usage: byte_read <device> <addr>
+     byte_write       :SMBus: byte write command
+                       Usage: byte_write <device> <addr> <value>
+     byte_data_read   :SMBus: byte data read command
+                       Usage: byte_data_read <device> <addr> <cmd>
+     byte_data_write  :SMBus: byte data write command
+                       Usage: byte_data_write <device> <addr> <cmd> <value>
+     word_data_read   :SMBus: word data read command
+                       Usage: word_data_read <device> <addr> <cmd>
+     word_data_write  :SMBus: word data write command
+                       Usage: word_data_write <device> <addr> <cmd> <value>
+     block_write      :SMBus: Block Write command
+                       Usage: block_write <device> <addr> <cmd> [<byte1>, ...]
+     block_read       :SMBus: Block Read command
+                       Usage: block_read <device> <addr> <cmd>
+
+Scan for available SMBus devices with command::
+
+   uart:~$ smbus scan smbus@fb00
+        0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
+   00:             -- -- -- -- -- -- -- -- -- -- -- --
+   10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+   20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+   30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+   40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+   50: 50 51 52 53 54 55 56 57 -- -- -- -- -- -- -- --
+   60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+   70: -- -- -- -- -- -- -- --
+   8 devices found on smbus@fb00

samples/drivers/smbus/boards/qemu_x86_64.conf

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+CONFIG_DYNAMIC_INTERRUPTS=y
+
+CONFIG_PCIE=y

samples/drivers/smbus/prj.conf

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+CONFIG_SMBUS=y
+CONFIG_SMBUS_INTEL_PCH=y
+CONFIG_SMBUS_LOG_LEVEL_DBG=y
+CONFIG_USERSPACE=y
+CONFIG_SHELL=y
+CONFIG_LOG=y
+
+CONFIG_EEPROM=y
+CONFIG_EEPROM_EMULATOR=n
+CONFIG_EEPROM_SIMULATOR=n

samples/drivers/smbus/qemu_x86_64.overlay

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+/*
+ * Copyright (c) 2022 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pcie/pcie.h>
+
+&smbus0 {
+	eeprom2: smbus_eeprom@50 {
+		compatible = "jedec,smbus-eeprom";
+		reg = <0x50>;
+		size = <0x100>;
+
+		status = "okay";
+	};
+};

samples/drivers/smbus/sample.yaml

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+sample:
+  description: SMBus sample
+  name: smbus sample
+common:
+  platform_allow: qemu_x86_64 ehl_crb rpl_crb
+  harness: console
+  harness_config:
+    type: one_line
+    regex:
+      - "Start SMBUS shell sample"
+tests:
+  sample.drivers.smbus.shell:
+    tags: smbus

samples/drivers/smbus/src/main.c

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+/*
+ * Copyright (c) 2022 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+
+void main(void)
+{
+	printk("Start SMBUS shell sample %s\n", CONFIG_BOARD);
+}