sysinfo: Provide a default driver to set SMBIOS values

Some boards want to specify the manufacturer or product name but do not
need to have their own sysinfo driver.

Add a default driver which provides a way to specify this SMBIOS
information in the devicetree, without needing any board-specific
functionality.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

drivers/sysinfo/Kconfig

@@ -22,4 +22,12 @@ config SYSINFO_SANDBOX
 	help
 	  Support querying device information for the Sandbox boards.
 
+config SYSINFO_SMBIOS
+	bool "Provide a default sysinfo driver for SMBIOS information"
+	help
+	  Some boards want to specify the manufacturer or product name but do
+	  not need to have their own sysinfo driver. This includes a default
+	  one which provides a way to specify this SMBIOS information in the
+	  devicetree, without needing any board-specific functionality.
+
 endif

drivers/sysinfo/Makefile

@@ -5,3 +5,4 @@
 obj-y += sysinfo-uclass.o
 obj-$(CONFIG_SYSINFO_GAZERBEAM) += gazerbeam.o
 obj-$(CONFIG_SYSINFO_SANDBOX) += sandbox.o
+obj-$(CONFIG_SYSINFO_SMBIOS) += smbios.o

drivers/sysinfo/smbios.c

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2020 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <sysinfo.h>
+
+static const struct udevice_id sysinfo_smbios_ids[] = {
+	{ .compatible = "u-boot,sysinfo-smbios" },
+	{ /* sentinel */ }
+};
+
+static const struct sysinfo_ops sysinfo_smbios_ops = {
+};
+
+U_BOOT_DRIVER(sysinfo_smbios) = {
+	.name           = "sysinfo_smbios",
+	.id             = UCLASS_SYSINFO,
+	.of_match       = sysinfo_smbios_ids,
+	.ops		= &sysinfo_smbios_ops,
+};

lib/Kconfig

@@ -658,6 +658,9 @@ config GENERATE_SMBIOS_TABLE
 
 	  Check http://www.dmtf.org/standards/smbios for details.
 
+	  See also SMBIOS_SYSINFO which allows SMBIOS values to be provided in
+	  the devicetree.
+
 config SMBIOS_MANUFACTURER
 	string "SMBIOS Manufacturer"
 	depends on GENERATE_SMBIOS_TABLE